Porcelain1 / dental implant courses by Indian dental academy

Porcelain Veneers:
a preliminary
review
INDIAN DENTAL ACADEMY
Leader in continuing Dental Education
www.indiandentalacademy.com

Contents
 Introduction
 Case selection
 Tooth preparation
 Temporary cover
 Laboratory technique
 Veneer placement(try-in)
 Veneer placement(cementation)
 Clinical applications
 Conclusions
 References

Introduction
 The restoration of unaesthetic anterior teeth has
always been a problem……
 Greater understanding of enamel etching and
development of high quality composite cements led
to…..
 Unfortunately,composite resins show….
 Acrylic veneers was an attempt to overcome some of
these problems.
 Porcelain as a veneering material was first reported
by Horn….built up in layers on a platinum foil matrix.
 Castable ceramics have also been used.

 Application of silane couplers to the
etched porcelain surface….

Case selection
 High standards of oral hygiene.
 Availability of adequate area of sound
enamel for etching.
 Correction of unaesthetic surface defects
such as…..
 Repair of structural deficiencies…
 Contra-indications are poor quality enamel or
insufficient sound enamel,rotated or
overlapped teeth.

Tooth Preparation
 extent of tooth preparation depends upon
type of restoration proposed…..
 Not always do porcelain veneers require tooth
preparation……….linguoversion, peg-
laterals.
 First step,establishment of gingival and
proximal chamfer finish lines.
 proximal finish lines …short of contact point.
 Gingival finish line....equi-,sub- or supra-
gingival

 Local anesthesia should be preferably
avoided…
 Labial reduction…0.5 mm…simply done
by placing vertical tracer cuts.
 Incisal preparation…
- Incisal bevel preparation
- Feathered incisal edge
- Intra-enamel or Window
preparation
- Overlapped incisal edge
preparation
 Final step,preparation of smooth
enamel surface.

Temporary cover
 Seldom required…..
 Impossible to place temporary cover
without any irritation to gingiva and as a
result loss of esthetics.

Impression technique
 Any of the elastomeric impression
material.
 A special tray is optional…modified
stock tray may be used for excellent
results.
 Addition of acrylic stops…
 Retraction cord …subgingival finish line.

Laboratory technique
 Master model cast in dentral
stone..individual dies duplicated in
refractory material.
 Porcelain built-up in layers…baked at
precise temperatures.
 Shaping,staining,trimming,polishing…
 Fitting surface etched with hydrofluoric
acid and silane coupling agent applied.

Veneer placement (try-in)
 Fit and contour checked on model first.
 Adjustments made with fine
diamonds…
 On patient, teeth isolated and cleaned.
 Veneers tried first individually, then all
together to check proximal binding.
 Composite cement of appropriate
shade is selected…
 Fitting surface coated with …..

Veneer placement
(cementation)
 Teeth are isolated…..
 Separated from adjacent teeth….
 Etched...
 Isolated….
 Light-cure bonding agent…
 Selected shade of cement is placed….
 10 sec spot cure….
 After completion of placement,excees cement
is removed…

 Excess stress on newly placed veneer
should be avoided….
 At return visit…..contacts are
assessed…. and polished…

Clinical Applications
 Fractured incisors
 Midline diastema
 Lingually placed lateral incisor
 Peg-shaped laterals
 Spaced teeth
 Discolorations

Conclusions
 Two hundred veneers in 30 months….
 Nil incidence of debonding…
 Fracture of incidence was
uncommon….
 Colour matching was straight forward…
 Excellent tissue response…
 No adverse pulp response…

References
 Faunce F R, Myers D R.
Laminate veneer restoration of permanent incisors.
J Am Dent Assoc 1976;93:790-792
 Hobo S, Iwata T
A new laminate veneer technique using a castable apatite ceramic
material. I.Theoretical considerations. Quintessence Int 1985;16:451-
458
 Hobo S, Iwata T
A new laminate veneer technique using a castable apatite ceramic
material.II.Practical considerations. Quintessence Int 1985;16:509-517
 Newburg R,Pameijer CH.
Composite resins bonded to porcelain with silane solution.
J Am Dent Assoc 1978;96:288-291

Porcelain1 / dental implant courses by Indian dental academy

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