The Trials and Tribulations of Local Anaesthesia: Tips on ... · The Trials and Tribulations of...
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The Trials and Tribulations of Local Anaesthesia: Tips on success and potential pitfalls
[email protected] Professor Oral Surgery Kings College London
President British Association of Oral Surgeons
AIMS; o To provide an overview of the patients perspective of dental LA o To discuss commonly used dental LA's and their potential side-effects. o To highlight problems with common dental LA injection techniques o To create awareness of different LA delivery protocols for common dental
procedures. OBJECTIVES; o Summarise the unwanted side effects of LA's o Minimise the risk of neurological damage. when giving LA's o Update the developing alternative LA injection techniques "
Kings College London-Tara Renton
• An update on pain • The patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Kings College London-Tara Renton
Outline
• An update on pain • The Patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Kings College London-Tara Renton
Outline
IASP definition of pain
An unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage
IASP definition of pain
An unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage
• The great protector….. Sensory feedback for all cranial functions Brains- Consciousness + neural regulation Breathing Sight Smell Taste The face…the organ that underpins communication
Trigeminal nerve
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Trigeminal nerve
Your patient is programmed to run for the hills!!!!!!!!
4 types of pain
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• Nociceptive healthy feeling pain ‘pain’
• Inflammatory pain health short lived after insult
• Neuropathic pains
• Dysfunctional pain
Clifford J. Woolf. What is this thing called pain? J Clin Invest. Nov 1, 2010; 120(11): 3742–3744.
Operative pain
&Dentine
sensitivity
Healthy
nociceptive
pain
Clifford J. Woolf. What is this thing called pain? J Clin Invest. Nov 1, 2010; 120(11): 3742–3744.
Pulpitis reversible
+irreversible
Periapical
periodontitis
Healthy
inflammatory
pain/infection/t
Trauma
Chronic
neuropathi
c pain
Posttraumatic
neuropathy
PDAP/ PHN Dysfunctional
pain Fibromyalgia
PIFP
TMD arthromyalgia?
o Nociception
o Sensation/perception
o Behaviour
o Suffering
Social / Cultural
Age, gender, race, peer
support, familial expectation
Emotional / psychologic
al
Depression, anxiety,
stress, fear, anger
Cognitive / Conceptual
Memories past experience, secondary gain, threat perception
Bio psycho
social Model
Pain Process
But is painless dental surgery really possible???
Are we a Magician or Dental surgeon?
Copyright www.orofacialpain.co.uk/newhome
Perioperative dental pain is not managed well
• 73.4% of patients report pain during dental treatment
• A population study with 1086 individuals has shown that 42.5% reported pain during dental treatment
• Pain intensity was reported as mild, uncomfortable, moderate, severe or very severe by 20%, 35.1%, 33.3%, 8.2% and 3.4% of patients, respectively In some cases, severe pain was reported by 25% of patients.
• As to dental experience involving severe pain, 60% of a representative sample of general population aged 15 years or more have reported pain at least once
Locker D, Shapiro D, Liddell A. Negative dental experiences and their relationship to dental anxiety. Community Dent Health. 1996;63(1):86-92. [ Links ] Maggirias J, Locker D. Psychological factors and perceptions of pain associated with dental treatment. Community Dent Oral Epidemiol. 2002;30(2):151-9. [ Links ] Siviero M, Nhani VT, Prado EFGB. Análise da ansiedade como fator preditor de dor aguda em pacientes submetidos à exodontias ambulatoriais. Rev Odontol UNESP. 2008;37(4):329-36.
Lack of empathetic treatment
10-15% of patients felt poorly cared for
Adult Dental Health Survey 2009
How can we maximise patient comfort and minimise pain?
– Clinician Caring, Communication
• Correct diagnosis
• Patient relationship
• Empathy works
– Manage patients expectations
• Education pre and post op
• Frank consent
• Allow some patient control
– Anxiolysis -assess and manage
– Surgical technique – LA, analgesics
– Post op advice
• Accessibility for patient contact
• Analgesics clear advice Copyright www.orofacialpain.co.uk/newhome
Nociception
Sensation
Behaviour
Suffering
• An update on pain • The Patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Outline
Patient perspective - anxiety
• Common
• The dental anxiety was measured by Modified Dental Anxiety Scale. (MDAS).
Fotedar S, Bhardwaj V, Fotedar V. Dental anxiety levels and factors associated with it among patients attending a dental teaching institute in Himachal Pradesh. SRM J Res Dent Sci 2016;7:153-7
Anxiety is determinant for pain during dental care and pain is related to local anaesthetic procedures. There are evidences that dentists' attitudes are determinants for pain.
Vassend O. Anxiety, pain and discomfort associated with dental treatment. Behav Res Ther. 1993;31(7):659-66.
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Patient perspective Phobia • an extreme or irrational
fear of or aversion to something.
Dental phobia is the most common phobia
Fear of pain • Melanocortin 1 receptor def –Mu
opoid receptor def
• Need 20% 20% more anaesthetic
• Melanocortin-1 Gene for Red Hair
2002 “It does appear that redheads have a
significantly different pain threshold and
require more anaesthetic to block out certain
pains,”
2010 Danish study suggests red headed
people feel the cold more but could handle
eating hot food
Our role models don’t help!
There aren't many people (if any) who actually enjoy going to the dentist – but at least one in 10 are absolutely terrified of the experience. These people suffer from extreme dental anxiety – which is more common in women than men – and the British Dental Health Foundation (BDHF) says they're often particularly frightened of having a tooth drilled (30%) or a local anaesthetic injection (28%).
Strategies to manage fearful anxious patients
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Reassurance Control Distraction Sedation oral, inhalational and IV indication for sedation need Hypnosis Acupuncture
Patient website Here are 10 ways to deal with your dental fears:
• 1. Find an understanding dentist. Ask friends and family if they can recommend one or look for someone who advertises themselves as an expert with anxious patients. You can search for your local dentists on the NHS’s online directory.
• 2. Relaxation methods including breathing techniques, muscle relaxation, self-hypnosis and visualisation can help.
• 3. Taking a friend and listening to music might help you relax.
• 4. Tell your dentist about your fears, and before treatment begins, agree a signal with him/her that means ‘stop’ in case you need a break.
• 5. The dental wand (a computer-driven injection system) is great for anyone with a needle phobia. A numbing gel can also be used to numb your gums before an injection.
• 6. If you're extremely nervous, ask your dentist to refer you to an NHS sedation clinic. Some people find inhalation sedation helpful, but truly terrified patients may prefer intravenous sedation (through an injection), which won’t knock you out – you’ll be awake and able to talk – but will deeply calm and relax you 7. Take a squashy object to hold and squeeze during treatment.
• 8. Concentrate on the external sounds in the dental surgery and things like the weight of your body on the chair, the texture of the armrest, etc. The idea is to focus outwardly to help you relax.
• 9. Ask the dentist to leave the chair upright if possible – some people feel more vulnerable lying down, which can increase anxiety.
• 10. Contact a support network such as Dental Phobia.
• http://home.bt.com/lifestyle/scared-of-the-dentist-10-ways-to-beat-your-phobia-11364013397424
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We can get it wrong! Showing videos as patient information to patients with previous negative dental experience …… Significantly increases anxiety !
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Psychological factors driving pain Sullivan MJ et al. Catastrophizing and perceived injustice: risk factors for the transition to chronicity after
whiplash injury. Spine (Phila Pa 1976). 2011 Dec 1;36(25 Suppl):S244-9 Dec;92(12):2041-56. Review
Lajnert V, et al Depression, somatization and anxiety in female patients with temporomandibular disorders
(TMD). Coll Antropol. 2010 Dec;34(4):1415-9
Alternative and holistic management of pain Bauer B et al. Effect of the combination of music and nature sounds on pain and anxiety in cardiac
surgical patients: a randomized study. Altern Ther Health Med. 2011 Jul-Aug;17(4):16-23.
Louw A, et al.The effect of neuroscience education on pain, disability, anxiety, and stress in chronic
musculoskeletal pain. Arch Phys Med Rehabil. 2011
Reduced pain in two ways -- either by giving them a placebo, or a difficult memory task. lacebo. But
when they put the two together, "the level of pain reduction that people experienced added up. There was no interference between them, Jason T. Buhle, Bradford L. Stevens, and Jonathan J. Friedman and Tor D. Wager.Distraction and Placebo: Two Separate Routes to Pain Control. Psychological Science, 2012
Placebos, Lacebos decrease Anxiety, stress and pain
Copyright www.orofacialpain.co.uk/newhome
ANXIETY FEAR STRESS PAIN THRESHOLD PAIN EXPERIENCE
Care in your LA technique!
• Reassurance/ warnings • Give your patient feeling of control • Distraction • Topical LA • Place finger tip near region where your about
to inject • Warm LA cartridges • Slow = painless • Avoid showing patient the syringe!
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A key factor in patient satisfaction is a sense that the caregiver is doing their best and is genuinely concerned that therapy is adequate.
(Bucknall, Manias, & Botti, 2007).
• An update on pain • The patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Kings College London-Tara Renton
Outline
LA Systemic complications
• 2731 patients dental LA in Germany • 45.6% pts had medical risk factors (mostly cardiovascular) • Overall 4.5% complications (5.7% in risk pts) non risk patients 3.5% • Most common dizziness, tachycardia, agitation, bronchospasm • Severe seizures, bronchospasm (0.07%) • Less complications with Articaine 4% I:100K epinephrine compared
with Articaine 4% I:200K epinephrine • Dose of anaesthesia variable
• Adverse effects are usually caused by high plasma concentration
of LA drug resulting from
– Inadvertent intravascular injection
– Excessive dose or rate of injection
– Delayed drug clearance
– Medically compromised patients
– Drug interactions
LA Systemic effects Avoid high dose
Incidence of Adverse Reactions
• Over 800 million dental local anaesthetic injections are given annually worldwide
• The adverse reaction rate is 1:1,000,000
• Mortality (death) rate from dental local anaesthetic injections has been
stated at 0.000002%*
• Allergies are very rare and can often be psychosomatic
“A study by Dundee Dental School showed that of 27 cases of “local anaesthetic
allergies”, only one was caused by the anaesthetic injection (and this was a
sulphite allergy, not a drug allergy)”
* Harris SC (1957) Aspiration before injection of dental local anaesthetics J Oral Surg;15:299-303
LA complications
Maximum doses
Drug Max dose 1/10th cartridge
2% lidocaine 4.4mg/kg 3.6 - 4.4mg
2%
mepivacaine
4.4mg/kg 4.0mg
3%
mepivacaine
4.4mg/kg 6.0 mg
3% prilocaine 6.0mg/kg 6.6mg
4% prilocaine 6.0mg/kg 8.0mg
4% articaine 7.0mg/kg 6.8 - 8.0mg
LA complications
Adult toxic doses Lignocaine and epinephrine 11 Cartridges Prilocaine and felypressin 4 Cartridges Articaine and epinephrine 7 Cartridges Bupivicaine with epinephrine 10 Cartridges Very difficult to reverse due to high protein binding capacity
Overdose Systemic effects Lidocaine
• When plasma levels are usually 3-5 mcg/mL
• Toxicity may be observed at 6 mcg/mL, but more likely above10 mcg/mL
• Additional factors increasing toxicity are;
– Site of injection
– Hepatic, cardiac and renal failure
– Speed of injection
– Hypo proteinaemia
– Acidosis
• Potential Drug interactions
Overdose Lidocaine toxicity • At serum levels patients may complain of; • 1-5 mcg/mL
– Tinnitus – Lightheadedness – circumoral numbness – Diplopia – metallic taste – may complain of nausea and/or vomiting, or they may become more talkative.
• 5-8 mcg/mL – nystagmus, slurred speech, localized muscle twitching, or fine tremors may be noticed.
Patients also have been noted to have hallucinations at these levels.
• 8-12 mcg/mL – focal seizure activity occurs; this can progress to generalized tonic-clonic seizures. Respiratory
depression occurs at extremely high blood levels (20-25 mcg/mL) and can progress to coma.
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Ageing patient
• Ageing men lose muscle mass, typically about 0.5- 1.0% per year after the age of 40.
• By the age of 50 up to roughly a 5-10% loss in muscle mass.
• Additionally, this loss in muscle mass is typically accompanied by an increase in fat mass, especially abdominal fat.
The term for the age-related decline in muscle mass is sacropenia. According to one study, approximately one in every two men over the age of 60 suffer from moderate sacropenia.2 Sacropenia causes a decrease in metabolism and a loss in functional strength.
Be careful with kids!
Child of 5 years -weighs 18 - 20kg- maximum dose 88mg (2 x 2.2ml Lidocaine cartridges)
Lidocaine toxicity symptoms - KIDS At serum levels patients may complain of;
• 1-5 mcg/mL
– Tinnitus
– Lightheadedness
– circumoral numbness
– Diplopia
– metallic taste
– may complain of nausea and/or vomiting, or they may become more talkative.
• 5-8 mcg/mL
– nystagmus, slurred speech, localized muscle twitching, or fine tremors may be noticed. Patients also have been noted to have hallucinations at these levels.
• 8-12 mcg/mL
– focal seizure activity occurs; this can progress to generalized tonic-clonic seizures. Respiratory depression occurs at extremely high blood levels (20-25 mcg/mL) and can progress to coma.
Goodson and Moore have documented catastrophic consequences of this drug interaction in pediatric patients receiving procedural sedation, along with excessive dosages of local anesthetics. Goodson JM, Moore PA. Life-threatening reactions after pedodontic sedation: an assessment of narcotic, local anesthetic and antiemetic drug interactions. J Am Dent Assoc. 1983;107:239–245.
Minimise toxicity
– Avoid injection intra-vascularly (USE ASPIRATION) and intraosseously
– Be aware of increased vascularity of inflamed tissue
– Observe clinical reactions: • Talk to the patient and monitor ECG/blood pressure to realize early
symptoms of central-nervous and cardiovascular toxicity
• Stop injection immediately when early symptoms are realized
• Consider the time course for development of toxic signs (5-10 min)
• Long acting and potent substances: dangerous! Bupivacaine („Fast in, slow out“)
Tips to Avoid LA systemic problems by not……
• Risk factors LA overdose – All 4 quadrant treatment (staged treatment for elderly patients) – Plain LA (no vasoconstrictor) – Full cartridge injections (should commonwealth move to 1.8ml cartridges?) – Exceeding maximum dose
• Prevent overdose – Aspirate – Slow injection – Dose vs Size of patient – Excretion
Medical Modifiers Pregnancy
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• Slow low volume injection Lidocaine +epinephrine OK
• Aspirate!
Medical Modifiers Hypertension
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Hypertension Systolic >200 <6 months MI or stroke or bypass Uncontrolled Hyperparathyroidism Brittle angina No issues with hypertension as long as infiltration or blocks with aspiration BUT
Systemic effects of epinephrine occur at normal
doses?
blood glucose epinephrine
K+
Medical modifier Diabetes epinephrine effects
Avoided with aspiration...legal requirement!
Medical Modifiers Renal Excretion
• Keep in mind that both liver and renal functions decline 50% by age 65.
• Also, beta blockers reduce hepatic blood flow, and this may prolong the elimination of amide local anaesthetics.
• Articaine is the exception because it has an ester side chain and is inactivated in serum by plasma cholinesterases.
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Montamat SC, Cusack BJ, Vestal RE. Management of drug therapy in the elderly. N Engl J Med.1989;321:303–309
Medical Modifiers Poor Clearance or compromised hepatic function
• Aspiration
• Slow low volume injection Lidocaine + epinephrine OK (>8 seconds application)
• Aspirate!
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Essentially if the patient can walk into dental surgery………
There is no contraindication to use epinephrine (with aspiration) but…. Recreational use of cocaine by patients can increase the risk of blood pressure and cardiac arrhythmias with injectable anaesthetics.
Medical modifiers Cardiac
Finder RL, Moore PA. Adverse drug reactions to local anesthesia. Dent Clin North Am Oct. 2002; 46(4):747-57.
Medical Modifiers Drug interactions • Lidocaine can interact with CNS depressants
• Lidocaine can interact with H2 Blocker (PPIs)
• Epinephrine – Propranolol is the only nonselective beta-blocker reported to have the
potential to cause severe hypertension and reflex bradycardia in the presence of epinephrine. A significant risk does not appear to be associated with the use of epinephrine and cardio selective beta-blockers.
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Medical Modifiers Methaemoglobinemia Methaemoglobinemia has been frequently reported in association with benzocaine use; lidocaine and prilocaine have also been implicated. At low levels (1-3%), methaemoglobinemia can be asymptomatic, but higher levels (10-40%) may be accompanied by any of the following complaints:
• Cyanosis • Cutaneous discoloration (gray) • Tachypnea • Dyspnea • Exercise intolerance • Fatigue • Dizziness and syncope • Weakness
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Myths Modifying factors-medical complications
You should avoid the use of adrenaline containing local anaesthetic in:
• Patients on Mono amine oxidase inhibitors
• All hypertensive patients
• All patients who have angina or had an MI
• All patients with liver disease
• Bilateral ID blocks are dangerous
• Citanest may induce labour in pregnant females
Barker SJ, Tremper KK, Hyatt J. Effects of methemoglobinemia on pulse oximetry and mixed venous oximetry. Anesthesiology. 1989;70:112–117. Becker DE, Reed KL. Local anesthetics: review of pharmacological considerations. Anesth Prog.2012;59:90–102
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Keep it simple Aspiration prevents most LA adverse events No brainer!
Standard Self-Aspirating
•The withdrawal by negative pressure of fluid from any cavity of the body
•A vital step when injecting an anaesthetic
•A legal requirement in UK
Signs of anaphylaxis
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Breathlessness- asthma symptoms bronchospasm throat swelling Rash-Urticaria itching Patient distress and awareness of feeling unwell Angioneurotic edema Abdominal cramping Irregular heart beat Hypotension Patient collapse
Anaphylaxis Patient collapse
Adult collapse = presumed cardiac arrest
• 1:1000 Units Epinephrine IM
• Oxygen
Get the defibrillator there
ASAP!
Every minute delay = 7% increase in
mortality rate
Systemic issues and LA
Causes of Allergy
Allergy may be due to
– Bung (Latex)
– Preservative
– Antiseptic
– Vasoconstrictor
– Local anaesthetic agent
LA complications
Esters are highly allergenic No documented allergy to amides Pt likely to be allergic to bisulphate preservative (needed for vaso-constricture). Least allergenic LAs are Mepivicaine or plain Prilocaine
What Causes Adverse Reactions?
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LA Complications Adjuvant agents
•Sodium Metabisulphite, an ingredient added to buffer pH of adrenaline-
containing solutions •Citanest® brands do not contain sodium metabisulphite as Octapressin does not
need buffering
•Plain anaesthetics do not need buffering (Scandonest Plain)
•Latex allergy to parts of the cartridge bungs/ membranes •Products that contain natural rubber can be untreated or treated to reduce the risk
of allergy
•Treated latex is heated to >160°C to denature proteins that cause allergic
reaction
•Not certain it will prevent a reaction if the allergy is severe enough
Local anaesthetics NOT all latex free The product has not been tested for presence of latex – it is assumed, therefore, to contain latex UK Medicines Information (UKMi) pharmacists for NHS healthcare professionals Date prepared: January 2012
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Brand name Ingredients Presentation Company Ref
Lidocaine
Xylocaine* Lidocaine 2% with
adrenaline 1:80,000
2.2mL standard and 2.2mL
self-aspirating cartridge
Dentsply 10
Emla cream Lidocaine 2.5% and
prilocaine 2.5%
5g tube (with or without
dressings) AstraZeneca
11
Xylocaine spray Lidocaine 10% spray 50mL bottle 11
Tetracaine
Ametop gel Tetracaine 4% 1.5g tube Smith & Nephew
Healthcare
12
• An update on pain • The patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Kings College London-Tara Renton
Outline
Problems in the post-injection period
• Nerve injury
• Tissue trauma-haematoma trismus
• Facial palsy
• Ophthalmic complications
LA complication Local
Complications of LA Trismus
• Rare due to haematoma formation in pterygoid muscles
• Usually related to haemorrhagic disorders or multiple injections
– Bleeding clotting disorders
– Short needle
– Avoid blocks
– Haematoma will disperse in 7-14 days
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• An update on pain • The patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Kings College London-Tara Renton
Outline
Effectivity of IDB
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• Lip numbness = pulpal paraesthesia WRONG
• When evaluated in 123 patients using a standardized alveolar nerve block method, the block provided analgesia /anesthesia to the
– first molar (92%),
– first premolar (55.3%)
– canine (38.2%) teeth of the lower jaw.
TN Lai, CP Lin, SH Kok Evaluation of mandibular block using a standardized method Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 102 (2006), pp 462 - 468
Actual pulpal anaesthesia rates using IDB!
•45-92%
•30-56%%
•28-45%
83 Meechan JG The use of the mandibular infiltration anesthetic technique in adults. J Am Dent Assoc.
2011 Sep;142 Suppl 3:19S-24S.
Failed IDB Local anesthesia
Malamed1 stated the rate of inadequate anaesthesia ranged from 31% to 81%. When expressed as success rates, this indicates a range of 19% to 69%. These numbers are so wide ranging as to make selection of a standard for rate of success for IANB seemingly impossible.
Supplemental infiltrations plus IDB 1st Molar
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Journal of Conservative Dentistry, Vol. 18, No. 3, May-June, 2015, pp. 182-186 Anesthetic success of supplemental infiltration in mandibular molars with irreversible pulpitis: A systematic review Seema Yadav
Failed LA Anatomy
• Broad angled jaw
• Take this into account when planning an IDB
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Tae Min You,1 Kee-Deog Kim,2 Jisun Huh,2 Eun-Jung Woo,2 and Wonse Park The influence of mandibular skeletal characteristics on inferior alveolar nerve block anesthesia J Dent Anesth Pain Med. 2015 Sep;15(3):113-119. English. 2015.
Failed LA Operator
Technique
• Infiltration
• Block
• Too fast
• Insufficient LA
• Patient non compliance
Equipment
• Inappropriate storage of LA
• Dose and type of LA
• Needle length
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Failed LA Pulpitis • This is a challenging clinical problem, and can only
be overcome by increasing the dose of anaesthetic in the area9, with increased accuracy of the placement of the anaesthetic solution.
• intra-ligamentary or intra-osseous approaches are most effective for this.
• In a number of patients careful probing will allow identification of a small bony canaliculus in the alveolar crestal bone, where it is possible to insert a fine (30/31g) needle, and instil the anaesthetic solution directly into the cancellous bone
• Patients should be warned of a brief sensation of palpitations as some anaesthetic solution will escape into the general vascular circulation. This also means that duration of anaesthesia will be limited, and is often no more than 20-30 minutes.
•
• In some cases, intra-pulpal injection of solution is possible, and usually is highly effective, although briefly painful;
• Articaine 4% infiltration may be helpful in these difficult cases10,11,12, although this may be inconsistent13, and also may be used as an infiltration palatal to an upper tooth, and buccal to a lower molar to supplement conventional approaches12.
• An increased dose of anaesthetic is typically required to achieve anaesthesia in these cases. Infiltrations or blocks typically require repeating, to achieve field anaesthesia, and it is often necessary to administer 0.75 – 1ml in the periodontal/intraosseous interface area to achieve anaesthesia.
• Meechan JG. How to overcome failed local anaesthesia. Br Dent J 1999; 186(1): 15-20
•
• Meechan JG. Articaine and lignocaine. Evid Based Dent. 2011;12(1):21-2
•
• Srinivasan N, Kavitha M, Loganathan CS, Padmini G. Comparison of anesthetic effi- cacy of 4% articaine and 2% lidocaine for maxillary buccal infiltration in patients with irreversible pulpitis. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009;107:133–6.
•
• Kanaa MD, Whitworth JW, Corbett IP, Meechan JG Articaine buccal infiltration enhances the effectiveness of lidocaine inferior alveolar nerve block. Int Endod J 2009; 42(3):238-46
•
• Kanaa MD, Whitworth JW, Meechan JG. A Comparison of the Efficacy of 4% Articaine with 1:100,000 Epinephrine and 2% Lidocaine with 1:80,000 Epinephrine in Achieving Pulpal Anesthesia in Maxillary Teeth with Irreversible Pulpitis. J Endodon. 2012; 38(3): 279-282
•
• Kuriyama T, Absi E G, Williams D W, Lewis M A. An outcome audit of the treatment of acute dentoalveolar infection: impact of penicillin resistance. Br Dent J 2005; 198: 759–763.
•
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• 182 patients
• 122 achieved successful pulpal anesthesia within 10 minutes after initial IANB injection only 82 experienced pain-free treatment.
• Articaine buccal infiltration (ABI) and Intraosseous (IO) allowed more successful (pain-free) treatment
• IANB + ABI 84% pain free RX
• IANB + IO 68% pain free Rx
• IANB + PDL 48% pain free Rx
• IANB alone 32% pain free Rx
Irreversible Pulpitis Supplemental techniques
Kanaa MD, Whitworth JM, Meechan JG. J Endod. 2012 Apr;38(4):421-5. doi: 10.1016/j.joen.2011.12.006. Epub 2012 Feb 2. A prospective randomized trial of different supplementary local anesthetic techniques after failure of inferior alveolar nerve block in patients with irreversible pulpitis in mandibular teeth.
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• Improved levels of analgesia may be obtained by adding an Articaine buccal infiltration to the IANB. – Parirokh et al (2010) 65%
– Rogers et al (2009) 62%
– Kanaa et al (2009) 52%
Parirokh M, Satvati S A, Sharifi R, Rekabi A R, Gorjestani G, Nakhaee N, Abbott P V. Efficacy of combining a buccal infiltration with an inferior alveolar nerve block for mandibular molars with irreversible pulpitis Oral Surg, Oral Med, Oral Path, Oral Radiol and Endodontol 2010 109:3 468-473 Kanaa M D, Whitworth J M, Corbett I P, Meechan J G. Articaine buccal infiltration enhances the effectiveness of lidocaine inferior alveolar nerve block International Endondon. 2009 J 42 238-246 Rogers B S, Botero T M, McDonald N J, Gardner R J, Peters M C. Efficacy of Articaine vs Lidocaine as a supplemental buccal infiltration in mandibular molars with irreversible pulpitis: a prospective, randomised, double-blind study J.Endodod. 2014 40:6 753-758
Failed LA Infection • Existing infection? • Local acidity of the infected
tissue will reduce the effectiveness of the alkaline base LA agent
• Avoid spreading infection by injecting in or near the focus
• Be smart use regional block anaesthesia (Infra orbital, greater palatine)
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Failed LA Consider Infiltration first then IDB • If failed
• Supplemental Articaine buccal infiltration for pulpitic teeth
• OR
• Repeat Infiltration
• Repeat different technique IDB Gow Gates or Akinosi
• Some endodontists use 3% Mepivicaine after routine Lidocaine 2% block fails
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The Akinosi vs Gow gates
• Patient impossible to anaesthetise
– Articaine infiltrations buccally
– Repeat Lidocaine block
– OR Mepivacaine Gow gates or Akinosi
• And WAIT>>>>>>>>>>>!
LA Failure- alternate techniques
• An update on pain • The patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Kings College London-Tara Renton
Outline
Complex region
Consequences
Social function
Eating
Drinking
Speaking
Kissing
Make up / shaving
Sleeping
IDENTITY?
The Trigeminal nerve
IANI
LNI
95% of IRTNI patients have pain pain Queral-Godoy E, Vazquez-Delgado E, Okeson JP, Gay-Escoda C. Persistent idiopathic facial pain following dental implant placement: a case report. Int J Oral Maxillofac Implants 2006; 21: 136-40. Rodriquez-Lozano F, Sanchez-Perez A, Moya-Villaescusa MJ, Rodriguez-Lozano A, Saez-Yuguero MR. Neuropathic orofacial pain after dental implant placement: review of the literature and case report. OOOE 2010; 109: e8-e12. Renton T, Yilmaz Z. Profiling of patients presenting with posttraumatic neuropathy of the trigeminal nerve. J Orofac Pain. 2011 Fall;25(4):333-44. Renton T, Dawood A, Shah A, Searson L, Yilmaz Z. Post-implant neuropathy of the trigeminal nerve. A case series. Br Dent J. 2012 Jun 8;212(11):E17. doi: 10.1038/sj.bdj.2012.497
Numbness, pain & altered sensation
• Depression
• Anger
• Post traumatic stress disorder
• Victim of abuse
• Loss of ability to trust
• Kubler Ross
Psychological impact
Dentistry is the ONLY healthcare profession taught to aim for nerves blindly during block injections!
Possible Mechanisms of nerve injury • Chemical o Agent o Vasoconstrictor o Buffer o Preservative o Metabolites
• Mechanical o Epineural, endonerural, epi fascicular, endo fascicular o Direct /Indirect
• Haemorrhage • Chemical iron content very irritant to neural tissue • Primary or secondary haemorrhage/ scarring epi or intra neural • Infection
Extrafascicular administration of clinically used concentrations of local anesthetic solutions may alter perineurial permeability, causing endoneural edema, increasing endoneurial fluid pressure, causing Schwann cell injury and axonal dystrophy with endoneural fibrotic changes as a late consequence (Myer et al., 1986).
Increased perineural permeability, resultant edema, and pressures intrafascicles, the normally hypertonic endoneural fluid becomes hypotonic (Hogan, 2008). Thus, a local anesthetic solution applied non-traumatically and externally to a peripheral nerve bundle may cause deleterious effects by increasing intraneural hydrostatic pressure.
Hydrostatic pressure from injection, direct mechanical injury to the nerve by the needle, or chemical injury from the local anesthetic solution itself (Haas, 2006)
http://trigeminalnerve.org.uk/
How we injure nerves during LA? Mechanism of trauma Mechanical Direct needle/ indirect scarring
Pressure ischaemia from bleed or LA Chemical LA agent, buffer, preservative, carrier Haemaglobin (Fe irritates nerve)
Extraneural Intra neural Intra fascicular Neural axonal Neural schwann cell (myelin) Blood vessels Fat
http://trigeminalnerve.org.uk/
Risks factors for Dental LA NIs • Block anaesthesia √ • Lingual nerve > IAN √
• Technique or Anatomy?
• Concentration of LA agent √ • Agent toxicity √ • Speed of injection √ • Multiple injections √ • Severe pain on injection √ • Type of LA Agent √
• Type of vasoconstrictor? • Sedated / anaesthetised patients? • Lack of LA aspiration?
• Volume of LA • Patient?
Bupivacaine
Mepivacaine
Citanest
Lidocaine
Articaine
Cause chemical -Agent toxicity
Methaemoglobinaemia is associated with large doses of Prilocaine
http://trigeminalnerve.org.uk/
Risk Factors LA concentration Increased concentration of LA agent DOES increase risk of nerve injury!
– Hillerup & Jenson 2008
– Haas &Lennon 2009
– Garisto et al 2010
– Hillerup 2010
– Renton 2011
– Haas 2011 • Articaine 21 times more likely to cause injury
– Hillerup et al 2011
– Hillerup et al 2011b • Rat nerve neurotoxicity 2vs 4% Articaine =concentration of Agent more likely neurotoxin than mechanical injury with saline
– Pogrel 2012
– Jacobs K report IFDAS 2015
– Piccini et al 2015
– Gaffen & Haas 2009
http://trigeminalnerve.org.uk/
From Pogrel 2012
There is no proven increased efficacy of
Articaine 4% VS Lidocaine 2 % IDBs
• Claffey E, Reader A, Nusstein J, Beck M, Weaver J. Anesthetic efficacy of articaine for inferior alveolar nerve blocks in patients with irreversible pulpitis. J Endod. 2004 Aug;30(8):568-71.
• Sierra Rebolledo A, Delgado Molina E, Berini Aytís L, Gay Escoda C Comparative study of the anesthetic efficacy of 4% articaine versus 2% lidocaine in inferior alveolar nerve block during surgical extraction of impacted lower third molars. Med Oral Patol Oral Cir Bucal. 2007 Mar 1;12(2):E139-44.
• Mikesell P,Nusstein, Reader A,Beck M,WeaverJ. A Comparison of Articaine and Lidocaine for Inferior Alveolar Nerve Blocks. J EndodonticsVolume 31, Number 4, April 2005
• Isabel Peixoto Tortamano, DDS, MSc, PhD, Marcelo Siviero, DDS, MSc, Carina Gisele Costa, DDS, MSc, PhD, Inês Aparecida Buscariolo, DDS, MSc, PhD, and Paschoal Laércio Armonia. A Comparison of the Anesthetic Efficacy of Articaine and Lidocaine in Patients with Irreversible Pulpitis. J Endodontics Volume 35, Number 2, February 2009
•
http://trigeminalnerve.org.uk/
Articaine (4%) no more clinically effective than 2% Lidocaine for pulpitic molars but very effective as buccal supplementary buccal infiltration
PAIN on injection? • 60% more likely to experience persistent neuropathy
• Review your pt next day
• Reassure 75% are temporary
• Early Medical intervention required?
Smith and Lung 2006
OUCH!
Risk Factors LANI Pain on injection
Other Risk factors for LA NIs – Sedated or anaesthetized patients? There is no evidence to support unresponsive patients, are less likely to protect themselves when neuralgia (funny bone reaction) occurs as the IDB needle encroaches too close to the nerve.
– Lack of LA aspiration? Again there is no evidence to support that aspiration during IDB results in lower persistent neuropathies but a pragmatic view may infer less chemical injected intra neural will cause less chemical nerve injury.
– Haemorrhage The iron content of haemoglobin is very irritant to neural tissue • Primary or secondary haemorrhage may result in scarring either epi or intra neural causing further
ischaemic and damage to the nerve
– Infection related neuropathy We frequently see infection related neuropathy associated with non vital teeth with apices close to the Inferior dental canal. Infection related to IDBs is rare and likely to be related to haematoma formation which is also very rare.
http://trigeminalnerve.org.uk/
Ultimately most cases of paresthesia resolve within eight weeks (Malamed 1997) 25% of IDB injuries are permanent!!
LA nerve injuries related to IDB 25% persistent No treatment we just have to sit and wait for recovery No evidence that Vit B complex, NSAIDs or steroids improve outcome Patients are baffled as to why they are not warned about the possibility of nerve injury
Consent- Incidence LA Nerve Injury (IANB) • Previous estimate -Inferior alveolar nerve block resulted in permanent paresthesia with
an incidence rate of between 1:26,762 and 1:160,571 (Pogrel et al., 2000).
• Sambrook & Goss 2011 reported prolonged anaesthesia in 15 cases in one year in South Australia (8% of Australian population) extrapolation leads to an estimated incidence of 1 in 27.415 cases of prolonged neuropathy related to LA Inferior dental blocks per year in Australia.
• Haas and Lennon 2000 found the incidence of local anesthetic induced paresthesia to be 1 in 785,000 injections
• Garisto et al 2010 reported a rate of 1 in 13,800.970.
• Renton et al 2013 reported a much higher incidence based upon surveys of dentists and a specialist per injections
– GDP restorative procedures 1 in 14K temp and perm 25% permanent
– Oral surgery 1 in 3.3K 75% recover 25% permanent
– Equivalent to 1 in 52K permanent injury
http://trigeminalnerve.org.uk/
Recommended in USA 1939
Obtaining written informed consent for the administration of local anesthetic in
dentistry.
Daniel L Orr, William J Curtis
Oral and Maxillofacial Surgery, Anesthesiology for Dentistry, University of Nevada School
of Medicine, Las Vegas 89102-2287, USA.
Journal of the American Dental Association (1939) (Impact Factor: 1.82). 12/2005;
136(11):1568-71.
ABSTRACT The purpose of this study was to examine the frequency with which dentists
obtain written informed consent for the administration of local anesthetic in dentistry.
The authors administered an informal survey to 252 dentists.
http://trigeminalnerve.org.uk/
Consent – Nerve injury warnings related to IANBs Routine in Germany
What do anaesthetist routinely warn their patients
undergoing spinal Block LA nerve injury incidence?
Compare this dental LANI rate with anaesthetic spinal block procedures.
NAP3 reports the estimated that nerve injury resulting from neuroaxial blocks
(epidurals, spinals and combined epidural with spinals) resulted in
sensory +/or motor nerve injury in 1 in 24-54K patients
(and paraplegia or death in 1 in 50-140K patients!)
ALL PATIENTS ARE WARNED! National RCA Audit 2012
IANB related Permanent dental nerve injury rate 1:26-52K
Why do we not routinely warn our dental patients?
As is done in Germany http://trigeminalnerve.org.uk/
Prevent Local anaesthesia induced nerve injuries by;
• Avoid multiple blocks
• No IDBs under GA
• Avoid high concentration IDBs (Articaine,Mepivacaine,Prilocaine)
• Stick to Lidocaine ID blocks for now!
• Is the future infiltration only with no IAN blocks????????
Renton T, Adey-Viscuso D, Meechan JG, Yilmaz Z. Trigeminal nerve injuries in relation to the local anaesthesia in mandibular injections. Br Dent J. 2010 Nov;209(9):E15
Infiltration Local Anaesthesia
• An update on pain • The patients perspective • Systemic issues for LA • Complications of LA • Failed LA • Avoiding LA nerve injuries • Update on LA techniques
Kings College London-Tara Renton
Outline
Or can alternative techniques reduce nerve injury? When is Gow Gates indicated?
Kings College London-Tara Renton
Or Akinosi?
http://vimeo.com/6508891
The Akinosi vs Gow gates
• Patient ‘impossible’ to anaesthetise
– Articaine infiltrations buccally
– Lidocaine block
– Mepivacaine Akinosi
• And WAIT>>>>>>>>>>>!
LA Failure
No palatal blocks required!
• Anesth Prog. 2013 Summer;60(2):42-5. doi: 10.2344/0003-3006-60.2.42. Comparison of buccal infiltration of 4% articaine with 1 : 100,000 and 1 : 200,000 epinephrine for extraction of maxillary third molars with pericoronitis: a pilot study.
• Lima JL Jr Dias-Ribeiro E Ferreira-Rocha J Soares R Costa FW Fan S Sant'ana E Prospective, double-blind, controlled clinical trial involved 30 patients between the ages of 15 and 46 years who desired extraction of a partially impacted upper third molar with pericoronitis
Local anaesthesia
With respect to maxillary infiltration anesthesia, some studies have found 4% articaine to be more effective than 2% lidocaine for lateral incisors but not molars (Evans et al., 2008), while others reported no clinical superiority for this injection (Oliveira et al., 2004; Vähätalo et al., 1993). A recent randomized controlled trial found a statistically significant difference supporting use of 4% articaine in place of 2% lidocaine for buccal infiltration in patients experiencing irreversible pulpitis in maxillary posterior teeth (Srinivasan et al., 2009)
Smart LA •Articaine 4% Buccal Infiltration
• +/- IDB Lidocaine 2%
•Articaine 4% Buccal Infiltration
•Post + ant near Mental foramen
• +/- Lingual Inf Lidocaine 2%
•Buccal infiltration + Lingual both Lidocaine 2%
136
Meechan JG The use of the mandibular infiltration anesthetic
technique in adults. J Am Dent Assoc. 2011 Sep;142 Suppl
3:19S-24S.
Local anaesthesia
Can Articaine 4% infiltration replace Lidocaine 2% IANBs for routine
dentistry?
Kings College London-Tara Renton
BACKGROUND: Articaine administered through buccal infiltration (BI) has been suggested as providing adequate posterior mandibular analgesia. This study compared the efficacy of articaine 4% with 1:100 000 adrenaline (test) and lignocaine 2% with 1:80 000 adrenaline (control), delivered either through an inferior alveolar nerve block (IANB) or BI for routine restorative procedures in mandibular posterior teeth among children. RESULTS: Fifty-seven children were recruited into the study; 29 allocated to IANB. Analgesia success for IANB 100%; BI 67%; p < 0.001. Analgesia success for BI with articaine 71%; lignocaine 64%, p > 0.05. Analgesia success was associated with fewer reports of painful dental treatment, p = 0.005. CONCLUSIONS: There was higher success and less painful treatment with IANB. There was no statistically significant difference in local analgesia success between articaine and lignocaine when delivered via BI.
A comparison of articaine 4% and lignocaine 2% in block and infiltration analgesia in children. Arrow P. Aust Dent J. 2012 Sep;57(3):325-33. doi: 10.1111/j.1834-7819.2012.01699.x. Epub 2012 May 28
For paedodontic restorative
Successful extractions in
Incisors-premolars 90%
M1Ms 60%
M2Ms 75%
Prospective audit 280 extractions by dental UGs
-no palatal blocks given
- Articaine infiltration
- Lidocaine IDB rescue
87% success!
For adult extractions
• Reduce nerve injury risk during implant bed
preparation by using infiltrative anaesthesia
Supraperiosteal infiltration anesthesia safe
enough to prevent inferior alveolar nerve during
posterior mandibular implant surgery?
Etoz OA, Er N, Demirbas AE.Med Oral Patol
Oral Cir Bucal. 2011 May 1;16(3):e386-9
Implant surgery
• Lidocaine 2% infiltration equally effective as Articaine 4% infiltration n Maxilla
• Articaine 4% infiltration 3.4 x more effective than 2% lidocaine infiltration for mandibular dentistry
Kings College London-Tara Renton
Intraligamentary and intra-osseous anaesthesia
pulp
dentine
intra-osseous injection
intraligamentary injection
alveolus
gingiva
Modified LA techniques
Injection in the periodontal ligament
between tooth and alveolar bone
• Needle inserted in a 30-40 ° angle to
the longitudinal axis of the tooth up to
the point of greatest resistance.
• A small volume (about 0,2 ml) of the
local anesthetic is slowly injected
under pressure
• Procedural Success rate: 80-100%
Techniques – Intraligamentary anesthesia
Shabazfar N., Daubländer M., Al-Nawas B., Kämmerer P.W.: Periodontal intraligament injection as alternative to inferior alveolar
nerve block - meta-analysis of the literature from 1979 to 2012. Clin Oral Investig (2014)
versus inferior alveolar nerve block?
Shabazfar N., Daubländer M., Al-Nawas B., Kämmerer P.W.: Periodontal intraligament injection as alternative to inferior alveolar
nerve block - meta-analysis of the literature from 1979 to 2012. Clin Oral Investig 2014.18(2):351-358.
Cardiovascular parameters PDL < IANB
Injection pain PDL < IANB
Second injection needed PDL ≈ IANB
IANB latency > 3 min; PDL instantly
IANB longer compared to PDL
Techniques – Intraligamentary anesthesia
versus inferior alveolar nerve block?
BUT
PDL with
• destruction periodontal fibers
• risk of bacteriaemia
Kämmerer P.W., Palarie V., Schiegnitz E., Ziebart T., Al-Nawas B., Daubländer M.: Clinical and histological comparison of pulp
anesthesia and local diffusion after periodontal ligament injection and intrapapillary infiltration anaesthesia. J Pain Relief.
2012; 1:108. doi:10.4172/2167- 0846.1000108- 0846.1000108
Techniques – Intraligamentary anesthesia
Intraligamentary anesthesia for extractions?
158 patients with 245 teeth
Manual intraligamentary syringe n=105
Inferior alveolar block n=140
Techniques – Intraligamentary anesthesia
Intraligamentary anesthesia for mandibular extractions?
YES
- Less local anesthetic
- Faster onset
- Faster start of treatment and
faster end of treatment
- No intravasal injections
- Shorter soft tissue anesthesia
Techniques – Intraligamentary anesthesia
Modified local techniques- AMSA
• Techniques include: • AMSA Ant sup middle alveolar nerve (incisal block) canine to canine
always with gingival margin and premaxillary palatal mucosa very slow rate requires topical anaesthetic.
• Infiltration palatal block don’t get numb lip with only one cartridge providing anaesthesia in half first molar to incisor and gingival margins (Williams 1999)
• PASA-nasoplataine block into foramen (Petxer 2001) • Figure 6.9 Figures of techniques • •
2006, the manufacturers of the original CCLAD, the Wand, introduced a new device, Single Tooth Anesthesia (STA™). STA incorporates dynamic pressure-sensing (DPS) technology that provides a constant monitoring of the exit pressure of the local anesthetic solution in real time during all phases of the drug's administration (Hochmann 2001).
Originally designed for use in medicine in epidural regional anesthesia (Ghelber ey al 2005), STA utilizes an adaptation of DPS to dentistry as a means of overcoming the problems associated with PDL injection (Hochmann 2007), and simplifies AMSA and P-ASA injections.
Modified local techniques- STA
dental cartridge
computerised delivery
control unit
connecting tubing
needle on holder ? possible due to computerised injection
systems
palatal anterior superior alveolar nerve
block
anterior middle superior alveolar nerve
block
Modified local techniques- Wand
The Comfort control (CC) Dentsply system (2001)
• Although, use of the Comfort Control Syringe may be more perceptive than that of the CompuDent system in the sense that the injection is controlled by hand, the syringe is bulky and more cumbersome to use than the Wand handpiece (Clark & Yagiela 2010).
• A comparison between the traditional dental syringe and the Comfort Control Syringe revealed no meaningful differences in ease of administration, injection pain and efficacy, and acceptance by patients(Grace et al 2003).
Kings College London-Tara Renton
Modified local techniques-Comfort control (CC) Dentsply system (2001)
Jet injector In 1947 Figge and Scherer Jet injection is based on the principle that liquids forced through very small openings, called jets, at very high pressure, can penetrate intact skin or mucous membrane. The primary use to obtain topical anaesthesia before the insertion of a needle. The jet injector is not an adequate substitute for the more traditional needle and syringe in obtaining pulpal or regional block anaesthesia. Three controlled studies of needleless devices have been reported. In an experiment, the needleless method (INJEX) seemed to provide faster anesthetic results, though the difference was not significant(Saleh et al). The participants were described as “volunteers,” which implies that they were adults. In the second controlled study, 94 patients aged 2 to 16 years who required 2 similar treatments on either side of the mouth received a traditional injection on one side and the needleless injection (Hypospray) on the other side during the same visit. Eighty-one percent of the children stated that they preferred the needleless technique. When the children were dichotomized by age, there was no relationship between age and method preference. The children’s level of cooperation was also not related to preference. About 5% of the children experienced pain with the needleless injection, while about 1% found the traditional injection painful. Gender effects were not reported (Schmidt et al).
Modified local techniques- Jet injector (needleless syringe - "Injex")
Future trends • The future interest is the possibility of development of newer improved agents
(sensory blocking agents only) and devices and techniques for achieving profound sensory anesthesia. A nasal spray (http://clinicaltrials.gov/ct2/show/NCT01302483 ) has shown to anesthetize maxillary anterior six teeth is set to be tested in an FDA Phase 3 trial, which will assess the spray's effectiveness compared to the current “gold standard” treatment - painful anesthesia injections.
• Another development is a syringe micro vibrator (SMV), (Shahidi Bonjar AH. Syringe micro vibrator (SMV) a new device being introduced in dentistry to alleviate pain and anxiety of intraoral injections, and a comparative study with a similar device. Ann Surg Innov Res. 2011;5:1–5. ) a new device being introduced in dentistry to alleviate pain and anxiety of intraoral injections.
• Adjunctive medication
• MISTS………
Kings College London-Tara Renton
Recommendations Prevention LA Nerve injuries
Prevention of LA nerve injuries is possible and some simple steps may minimise LA related nerve injuries:
• TAILORED INFILTRATION LA
• Avoid IAN blocks by using infiltrations supra periosteal or intraligamental injections for extractions Infiltration dentistry
• Avoid high concentration LA for ID blocks (use 2% Lidocaine as standard). There is increasing evidence that higher concentration agents are more neurotoxic thus more likely to cause persistent inferior dental block (IDB) related neuropathy.
• Avoid multiple blocks where possible
• Modify training NOT to HIT the nerve! -Should we aspirate and avoid direct IDB or use higher IDB techniques?
• Change of practise is always a challenge and we must start with training our dental students in procedure specific LA techniques and consenting patients appropriately in the light of the associated risks.
http://trigeminalnerve.org.uk/
Recommendations prevent LANIs Should LA cosent practice change?
• Consent for LA Patents are routinely warned of a risk of nerve injury when routinely undergoing epidural or spinal injections (17) Reports the estimated that nerve injury resulting from neuroaxial blocks (epidurals, spinals and combined epidural with spinals) resulted in sensory or motor nerve injury in 1 in 24-54K patients (and paraplegia or death in 1 in 50-140K patients)). Already in Germany most of Europe and US patients are routinely warned about risks associated with IDBs (46).
www.trigeminalnerve.org.uk
Don’t just reach for the IANB use your imagination!
For perio, paedo and routine dental extractions
Articaine buccal infiltration only OR Intraligamental technique
For Hot Pulps
IANB Lidocaine 2% plus Articaine 4% Buccal infiltration
For Third molar surgery
Articaine buccal infiltrations 2ml 4% and IDB with lidocaine 2%
when needed (NO palatals required!) OR Intraligamental technique
For Implants Articaine buccal infiltration ONLY
Recommendations