‘Hands on’ Posterior Tooth...
Transcript of ‘Hands on’ Posterior Tooth...
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‘Hands-on’ Posterior Tooth Preparation
Practical Skills Courses, SWL, 25/11/2016
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‘Hands-On’ Didactic Teaching ‘A Tooth-Friendly-Approach’ - Hands-on Tooth Preparation Course -
Dental Simulation
to include: Posterior Full Veneer (shell) Crown – Cast precious or non-precious metal alloy Posterior Adhesive Metal Hat Provisional crowns Posterior Zirconium Monolithic or PFM
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Plastic Teeth – we have lots to practice on
PB 2016
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PFM ‘winged’ Preparation
Preparation Specifications:
Incisal Reduction: 1.5-2.0mm
Labial Shoulder: 1.0-1.5mm
Palatal Chamfer: 0.5mm
Palatal Reduction: 1.0mm Metal
2.0mm Metal/Ceramic
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• We started with an anterior Porcelain Fused to Metal Crown – as it still accounts for more than 90% of all prescribed crowns in the UK
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Tasks today
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The FGC preparation is very challenging!
PB 2013
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• Invest in your skills – know your shortcomings – know how to improve them – most of us need around 2000 hours of experience to develop high level reproducible practical skills
• Cut no corners today
• Remember - no easy way to achieve quality dentistry
• Do your best and you will enjoy the challenge
• Self challenge and reflect – why is it not good?
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• We all need to work hard – the tax payer is paying • We are using plastic teeth – you now how to handle
them • We are using 3 striper bur sets • I want the focus to be on quality hand piece control,
attention to detail and craft precision
Rules of the Day
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We will not ask you to do anything that we cannot
PB 2016
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• Reflection on where you are and what you need to improve
• Get feedback from us and your colleagues
• Enjoy the day and have fun but please reflect on what you have done
Rules of the Day
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Need to know dimension of the burs
we are using and thickness of rounded
tip!
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We will all
use a
Putty
Index
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I look at them like implant stents (diastema OI case – you need precision)
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FGC prep can cause dentists many problems
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Cast Metal Posterior Conventional Crown Preparation Specifications:
Occlusal Reduction: Non-Functional 1mm Functional Cusp - 1.25 -1.5mm Margin: Chamfer 0.5 – 0.7mm supra-gingival 2 plane labial reduction Adequate interdental clearance for technician Taper: 7o taper & no undercuts
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Objective Assessment of: Margin
• Depth – 0.5 - 0.7mm
• Consistency for chosen material
• Smoothness – why?
• Position relative to gingival margin
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Objective Assessment of: Taper
• 7 degree taper per wall
• 14 degree convergence taper
• No undercuts
• Smooth walls
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Objective assessment of: Axial reduction and undercuts
Use sharp pencil at each of the four line angles to check for undercuts
If you can see all four then no undercuts – if not you have an undercut
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”…..Give me the surgeon who does the correct operation rather than the one who skilfully
performs the wrong one….."
Lord Moynihan President of the Royal College
of Surgeons of England, 1926-1931.
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Objective Assessment of: Occlusal Reduction
• Depth – Consistent for chosen material
• Maintain anatomical form
• Function cusp bevel
• Confirm with putty index
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Objective Assessment: Occlusal Reduction
Keep the position of the:
Central Fossa – middle of tooth
Cusp and cusp tips – similar position as pre-prepared tooth
PB 2011
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Objective Assessment: Occlusal reduction
Keep the position of the: Central Fossa (mesial to distal) – middle of tooth Central Fossa (buccal to lingual) – similar position as pre-prepared tooth This will ensure that your cuspal anatomy will be in the correct place on the tooth
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Keep the position of the:
Central Fossae
Cusp and cusp tips – similar position as pre-prepared tooth
This will ensure that your cuspal anatomy will be in the correct place on the tooth
Objective Assessment: Occlusal reduction
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Critique
• Taper
• Undercuts
• Reduction
• Occlusal form / anatomy
• Margin depth
• Margin height
• Overall shape
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Self-Reflection
• Very rough generally – want to see better from you all
• Taper(s) OK • 2 plane reduction OK • No undercuts • Occlusal anatomy maintained • Functional cusp bevel not pronounced
enough • Margin depths OK but to near the
gingival tissues • Interdental clearance fine
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Self-Reflection
• Much smoother generally – but could
be better • Taper(s) OK • 2 plane reduction OK • No undercuts • Occlusal anatomy maintained • Functional cusp bevel not pronounced
enough • Margin depths OK and good position in
comparison to the gingival tissues • Interdental clearance fine
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Go on and do a Full Gold or Cast Metal Full Veneer Crown Preparation
PB
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Full Gold Crown Preparation
• 0.5-0.7mm margins (0.5mm supragingival)
• Occlusal clearance: 0.7-1mm (non functional cusps) 1.25 (functional cusps)
• Maintain occlusal anatomy and central fossae & cuspal form
• 7 degree wall taper - no undercuts
• 2 plane buccal reduction
• Good clearance of interdental preparation margins with the neighbouring tooth/teeth
• Smooth margins and walls
• Verification of dimensions with putty index
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RESIN RETAINED CAST METAL CUSPAL COVERAGE RESTORATION
• The design does not need to incorporate features of resistance or retention form as the retention is derived from bonding with an adhesive such as Panavia
• No need to break interproximal contact if sufficient bonding area
• No need to remove existing restorations – clinical and radiographic assessment is necessary
• Still need maintenance of occlusal anatomy – position and form the fossa and cusp tips must remain
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Enamel margins, supra-gingival & able to control GCF
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Preparation Specifications
• Externally similar to FGC preparation except that the restoration margins are positioned occlusally
• Occlusal Reduction: 1.0mm Non-Functional • 1.25mm Functional • Axial Chamfer: 0.5mm • Functional cusp bevel • Margins positioned 1.0 - 2.0mm from occlusal surface if there
is sufficient enamel for bonding. • Contact points are left intact unless a proximal restoration is present
or teeth very worn • Margins are finished on sound enamel
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Adhesive Cast Metal ‘Hat’
• Externally similar to FGC preparation except that the restoration margins are positioned occlusally
• Occlusal Reduction: 1.0mm Non-Functional • 1.25mm Functional • Axial Chamfer: 0.5mm • Functional cusp bevel • Margins positioned 1.0 - 2.0mm from occlusal surface if there
is sufficient enamel for bonding. • Contact points are left intact unless a proximal restoration is present
or teeth very worn • Margins are finished on sound enamel
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• Can use a rugby ball bur to do most of the work
• Preps are therefore very quick • Cementation and fit the key time
commitments • You are using adhesive dentistry /
bonding – so moisture control is King
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Minimal Tooth Preparations: Suggestions
• No retention / resistance
grooves
• Minimal inter-occlusal
preparation
• No ‘offsets’ / bevels
• Preservation of enamel with
supra-gingival margins whenever
possible
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Minimal Occlusal Coverage Preparations: Suggestions
• Only take out interdental contacts if inadequate tooth material present above contact points to retain and stabilise future restoration (i.e. very short teeth)
• No sharp angles and rounded internal angles important for ceramic restorations
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Minimal adhesive posterior tooth preparations: (Chana et al 2000)
• No retention / resistance grooves as pre-cementation retention has no relevance to cemented performance (Osman et al 2010)
• Minimal interocclusal preparation
• No ‘offsets’ / bevels
• Preservation of enamel with supra-gingival margins whenever possible (Briggs et al 2002)
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Minimal Adhesive Occlusal Coverage Preparations
• More reliance placed on adhesive retention
• Enamel at the margins - very important
• I feel as long as enamel at periphery then can afford to have much exposed dentine / existing restorative material present
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2003 1993
Practical Issues: Adhesive Dentistry for posterior teeth
Will keep the future options open as you do not need conventional retention / resistance forms of tooth preparation – but is more fiddly at the cementation appointment - you need
enough tooth tissue to bond to and good moisture control
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I accept that temporisation is more difficult as less has been taken off the teeth and there is little IO space
• Need to be more flexible
• Over - contour for extra strength e.g. overlap buccal / lingual areas and consider the use of a more adhesive cement e.g. Poly F
• It would be a shame to avoid these type of restorations on behalf of more difficult temporisation 1999
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Temporary Crowns
• Direct
• Indirect – where you are dealing with more teeth – diagnostic wax up – pre-planned Provisionals – used to diagnose function / occlusion and appearance
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Temporisation
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Temporisation of lower incisors where there are several teeth fuse the temps together it
makes sense
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Go and enjoy the day