2 artificialcrowns partialveneercrowns midterm2 120203195654 phpapp01

7/29/2019 2 Artificialcrowns Partialveneercrowns Midterm2 120203195654 Phpapp01

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A type of crown that partiallycovers or veneers the clinical

crown

Usually the involved surfaces are

the proximal, lingual andincisal/occlusal (anterior andposterior crown) and somebuccal (posterior 7/8 crown andmodified crown) except forlaminate veneers wherein thelabial, incisal and proximal

surfaces are involved


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Several types of partial veneers

exist:

a. Posterior teeth

1. Three-quarter crown2. Modified three-

quarter crown3. Seven-eights crown


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Several types of partial veneers

exist:

b. Anterior teeth

1. Three-quarter crown

2. Pinledge

3. Laminate veneer


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TYPES OF

PARTIAL VENEERCROWNS


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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:

a. Sturdy clinical crown of averagelength or longer

b. Intact buccal surface not in need ofcontour modification and well-supported by sound toothstructure

c. No conflict between axial

relationship of tooth andproposed path of withdrawal ofFPD


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Contraindications:

a. Short teeth

b. High caries indexc. Extensive destruction

d. Poor alignment

e. Bulbous teethf. Thin teeth


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Advantages:

a. Conservative of tooth structure

b. Easy access to margins

c. Less gingival involvement thanwith complete cast crown

d. Verification of seating simplee. Electric vitality test feasible


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Disadvantages:

a. Slightly less retentivethan complete cast

crownb. Limited adjustment of

path of withdrawal

c. Some display of metal


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2. Anterior Teeth PVC

a. Three-quarter crown


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Indications:

a. Sturdy clinical crown of averagelength or longer

b. Intact labial surface that is not in

need of contour modificationand that is supported by soundtooth structure

c. No discrepancy between axial

relationship of tooth andproposed path of withdrawal ofFPD


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Contraindications:

a. Short teethb. Nonvital teeth

c. High caries index

d. Extensive destructione. Poor alignment with path of

withdrawal of FPD

f. Cervical caries

g. Bulbous teeth

h. Thin teeth


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Advantages:

a. Conservation of tooth structureb. Easy access to margins for finishing

(dentist) and cleaning (patient)

c. Less gingival involvement thanwith complete cast crown

d. Easy escape of cement and good

seatinge. Easy verification of complete

seating

f. Electric vitality test feasible


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Disadvantages:

a. Slightly less retentive than completecast crown

b. Limited adjustment of path ofinsertion

c. Some display of metal

d. Not indicated on nonvital teeth


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2. Anterior Teeth PVCb. Pinledge

Periodontal problemLingual Preparation

Anterior Splinting


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Indications:

a. Undamaged anterior tth in caries-free mouth

b. A high esthetic requirement

c. Where proximal grooves areimpossible to prepare

d. To alter lingual contour of max.

anterior teeth or to alterocclusion

e. Anterior splinting


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Contraindications:

a. Large pulps

b. Thin teeth

c. Nonvital teeth

d. Carious involvement

e. Problems with proposedpath of withdrawalof

FPD


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Advantages:

a. Minimal tooth reduction

b. Minimal margin length

c. Minimum gingival involvementd. Optimum access for margin

finishing and hygiene

e. Adequate retention

f. Excellent esthetics


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Disadvantages:

a. Less retentive than completecoverage

b. Alignment can prove difficult

c. Technically demanding

d. Not usable on nonvital teeth


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2. Anterior Teeth PVC

c. PorcelainLaminate Veneer


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0.3-0.5mm


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Proximal contact areasand incisal edge arepreserved and thepreparation is

limited to enamel.

A reduction depth of 0.3-0.5mm is recommended.


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Prepared Teeth for

Laminate VeneersChamfer


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Cemented Laminate

Veneers


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Functionality of bite iscritical to comfortabledental rehabilitation. The

mandibular incisorsshould be in gentle touchwith the palatal surfacesof the maxillary incisors,

being 1 mm behind and 1mm below.

The "S" sound is used to

determine the verticalheight of dimension. Thishelps us to determine therelation 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 theplaque index, and

one can see the

healthy tissue

around thebiologically

integrated porcelain

laminate veneers.


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Indications:

a. Discoloration (e.g. dentalfluorosis or mottled

enamel/Tetracycline stain)


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b. Correcting diastema


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Diastema closure and lengthening ofcrown cervicoincisally/wideningmesiodistally


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c. Fracture involving proximoincisal

surface

A B

C

D


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d. Masking tooth defects

ex. Peg shaped incisors


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e. lengthening of crowncervicoincisally for esthetics


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Contraindications:

a. High caries indexb. Poor plaque control

c. Extensive existing large

restorations or endodon-tically teeth with little

remaining tooth structured. Tooth wear due to BRUXISM

e. Short teeth


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f. Teeth with insufficient or

inadequate enamel forsufficient retention

(ex. Severe abrasion)

g. Patients with oral habitscausing excessive stress on

the restoration(ex. nail biting/pencil

biting)

d


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Advantages:a. Superior esthetics

b. Wear and stain resistantc. Excellent long term

durability abrasion-resistant/color-stable, excellent

resistance to fluid absorptiond. 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

Disadvantages:


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Disadvantages:a. Increased tooth contour

b. Expensivec. Time multiple visits are required

d. Fragility during try-in andcementation

e. Lack of repair ability difficult, ifnot impossible, to repair

f. Difficulty in color matching

g. Irreversibility

unlike bleaching,requires tth reduction althoughminimal

h. Inability to trial cement the

t ti

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