2. artificial crowns partial veneer crowns -midterm2
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Transcript of 2. artificial crowns partial veneer crowns -midterm2
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ARTIFICIAL ARTIFICIAL CROWNSCROWNS
PARTIAL VENEER PARTIAL VENEER CROWNSCROWNS
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A type of crown that partially covers or veneers the clinical crown
Usually the involved surfaces are the proximal, lingual and incisal/occlusal (anterior and posterior ¾ crown) and some buccal (posterior 7/8 crown and modified ¾ crown) except for laminate veneers wherein the labial, incisal and proximal surfaces are involved
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Several types of partial veneers exist:
a. Posterior teetha. Posterior teeth
1. Three-quarter crown1. Three-quarter crown
2. Modified three-2. Modified three-quarter crownquarter crown
3. Seven-eights crown3. Seven-eights crown
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Several types of partial veneers exist:
b. Anterior teethb. Anterior teeth
1. Three-quarter crown
2. Pinledge 3. Laminate veneer
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TYPES OFTYPES OF PARTIAL VENEER CROWNS
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1. Posterior Teeth PVC
Three-quarter crownSeven-eighth crown
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Modified three-quarter crown
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Indications:Indications:
a. Sturdy clinical crown of average a. Sturdy clinical crown of average length or longer length or longer
b. Intact buccal surface not in need b. Intact buccal surface not in need of of contour modification and contour modification and well- well- supported by sound supported by sound tooth tooth structure structure
c. No conflict between axial c. No conflict between axial relationship of tooth and relationship of tooth and
proposed path of proposed path of withdrawal of withdrawal of FPD FPD
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Contraindications:
a. Short teetha. Short teeth
b. High caries indexb. High caries index
c. Extensive destructionc. Extensive destruction
d. Poor alignmentd. Poor alignment
e. Bulbous teeth e. Bulbous teeth
f. Thin teethf. Thin teeth
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Advantages:
a. Conservative of tooth structurea. Conservative of tooth structure
b. Easy access to marginsb. Easy access to margins
c. Less gingival involvement than c. Less gingival involvement than with complete cast crown with complete cast crown
d. Verification of seating simpled. Verification of seating simple
e. Electric vitality test feasiblee. Electric vitality test feasible
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Disadvantages:
a. Slightly less retentive a. Slightly less retentive than complete cast than complete cast crowncrown
b. Limited adjustment of b. Limited adjustment of path of withdrawalpath of withdrawal
c. Some display of metalc. Some display of metal
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2. Anterior Teeth PVC a. Three-quarter crown
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Indications:Indications:a. Sturdy clinical crown of average a. Sturdy clinical crown of average
length or longerlength or longer
b. Intact labial surface that is not in b. Intact labial surface that is not in need of need of contour contour
modification modification and that is supported and that is supported by sound by sound tooth structuretooth structure
c. No discrepancy between axial c. No discrepancy between axial relationship relationship of tooth of tooth and and proposed path of proposed path of withdrawal of withdrawal of
FPDFPD
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Contraindications:a. Short teetha. Short teeth
b. Nonvital teethb. Nonvital teeth
c. High caries indexc. High caries index
d. Extensive destructiond. Extensive destruction
e. Poor alignment with path of e. Poor alignment with path of withdrawal of FPDwithdrawal of FPD
f. Cervical cariesf. Cervical caries
g. Bulbous teethg. Bulbous teeth
h. Thin teethh. Thin teeth
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Advantages:a. Conservation of tooth structurea. Conservation of tooth structure
b. Easy access to margins for finishing b. Easy access to margins for finishing (dentist) and cleaning (patient)(dentist) and cleaning (patient)
c. Less gingival involvement than c. Less gingival involvement than with complete cast crownwith complete cast crown
d. Easy escape of cement and good d. Easy escape of cement and good seatingseating
e. Easy verification of complete e. Easy verification of complete seatingseating
f. Electric vitality test feasiblef. Electric vitality test feasible
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Disadvantages:
a. Slightly less retentive than a. Slightly less retentive than complete complete cast crowncast crown
b. Limited adjustment of path of b. Limited adjustment of path of insertioninsertion
c. Some display of metalc. Some display of metal
d. Not indicated on nonvital teethd. Not indicated on nonvital teeth
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2. Anterior Teeth PVC b. Pinledge
Periodontal problemLingual Preparation
Anterior Splinting
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Indications:
a. Undamaged anterior tth in a. Undamaged anterior tth in caries-caries- free mouthfree mouth
b. A high esthetic requirementb. A high esthetic requirement
c. Where proximal grooves are c. Where proximal grooves are impossible to prepareimpossible to prepare
d. To alter lingual contour of max. d. To alter lingual contour of max. anterior anterior teeth or teeth or
to alter to alter occlusionocclusion
e. Anterior splintinge. Anterior splinting
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Contraindications:
a. Large pulpsa. Large pulps
b. Thin teethb. Thin teeth
c. Nonvital teethc. Nonvital teeth
d. Carious involvementd. Carious involvement
e. Problems with e. Problems with proposed proposed path of path of withdrawalwithdrawal of of FPD FPD
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Advantages:
a. Minimal tooth reductiona. Minimal tooth reduction
b. Minimal margin lengthb. Minimal margin length
c. Minimum gingival c. Minimum gingival involvementinvolvement
d. Optimum access for margin d. Optimum access for margin finishing and hygiene finishing and hygiene
e. Adequate retentione. Adequate retention
f. Excellent estheticsf. Excellent esthetics
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Disadvantages:
a. Less retentive than a. Less retentive than complete complete coveragecoverage
b. Alignment can prove b. Alignment can prove difficultdifficult
c. Technically demandingc. Technically demanding
d. Not usable on nonvital d. Not usable on nonvital teethteeth
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2. Anterior Teeth PVC2. Anterior Teeth PVC
c. Porcelain c. Porcelain Laminate Laminate
VeneerVeneer
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0.3-0.5mm
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Proximal contact areas and incisal edge are preserved and the preparation is limited to enamel.
A reduction depth of 0.3- 0.5mm is recommended.
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Prepared Teeth for Prepared Teeth for Laminate VeneersLaminate Veneers
Chamfer
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Cemented Laminate Cemented Laminate VeneersVeneers
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Functionality of bite is critical to comfortable dental rehabilitation. The mandibular incisors should be in gentle touch with the palatal surfaces of the maxillary incisors, being 1 mm behind and 1 mm below.
The "S" sound is used to determine the vertical height of dimension. This helps us to determine the relation of the maxillary and mandibular teeth.
1mm.
1mm.
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When porcelain laminate veneers are properly prepared, produced, and finished, an increase of the crevicular fluid decreases the plaque index, and one can see the healthy tissue around the biologically integrated porcelain laminate veneers.
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Indications:Indications:
a. Discoloration (e.g. dental fluorosis or mottled
enamel/Tetracycline stain)
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b. Correcting diastema
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Diastema closure and lengthening of crown cervicoincisally/widening mesiodistally
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c. Fracture involving c. Fracture involving proximoincisal surfaceproximoincisal surface
A B
CD
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d. Masking tooth defects
ex. Peg shaped incisors
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e. lengthening of crown cervicoincisally for esthetics
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Contraindications:Contraindications:a. High caries indexb. Poor plaque controlc. Extensive existing large
restorations or endodon- tically teeth with little remaining tooth structured. Tooth wear due to BRUXISMe. Short teeth
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f. Teeth with insufficient or inadequate enamel for sufficient retention
(ex. Severe abrasion) g. Patients with oral habits causing
excessive stress on the restoration
(ex. nail biting/pencil biting)
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Advantages:Advantages: a. Superior estheticsb. Wear and stain resistantc. Excellent long term
durability – abrasion-resistant/color-stable, excellent resistance to fluid absorption
d. Inherent porcelain strength – exhibits excellent compressive, tensile and shear strength
e. Minimal tooth reduction – 0.3-0.5mm only
f. Soft tissue compatibility – biocompatible w/ soft tissues
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Disadvantages:Disadvantages:a. Increased tooth contour b. Expensivec. Time – multiple visits are requiredd. Fragility – during try-in and
cementatione. Lack of repair ability – difficult, if not
impossible, to repairf. Difficulty in color matchingg. Irreversibility – unlike bleaching,
requires tth reduction although minimal h. Inability to trial cement the
restoration