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Cavity Preparation for composite
Restoration
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DR.DEEPAK RAISINGANIASSOCIATE PROFESSOR
DEPT OF CONS
ERVATIV
EDE
NTISTRY &END
OD
ONTICSMAHATMA GANDHI DENTAL COLLEGE & HOSPITAL
SITAPURA JAIPUR
2
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Indication of Operative DentistryIndication of Operative Dentistry
Caries;
Malformed, discolored,or fractured teeth;
Restoration replacement.
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Tooth-colored restoration
For Class and
Esthetic Dentistry
For Classand
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What are Tooth-colored materials?
What is their working mechanism?
What are the cavity preparation
futures for tooth-colored restoration?
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What are steps for tooth-colored
restoration?
What are the advantage & disadvantage
of tooth-colored restoration?
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Tooth-Colored Materials
Composite resin
Glass ionomer cement
Compomer
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Composite Resin
Traditional composites
Hybird composites
Flowable composites
Condensable composites Packable
Universal composites
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Glass Ionomer
Chemical adhesion to dentin
Release Fluoride
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Compomer
Compomer =
Composite + Ionomer
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Dental Adhesionor
Dental Bonding
Adhesion is a process of solid and/or
liquid interaction of one material withanother at a single interface.
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Enamel bonding system
Enamel bongding depends on resin tags
becoming interlocked with the surfaceirregularities created by etching.
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Macrotags: form between enamel rod
peripheries.
Microtags: smaller tags form across
the end of each rod.
Macrotags and microtags are the basisfor micro-mechanical bonding.
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Dentin bonding system
The difficulties of dentin bonding:
More water---wet bonding
Lower calcification
Richer organic---collagen network
Smear layer
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The bond strength is primarily related
to micro-mechanical bonding to the
intertubular dentin which occuresbetween tubules along the cut dentin
surface.
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Dentin Bonding Agent, DBA
Early DBA were hydrophobic, bonded
directly to the dentin smear layer.Bond strengths6MPa.
LaterDBA removed the smear layer buttended to over-etch dentin.
Bond strengths10~12MPa.
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DBAwere chemically modified to be
more hydrophilic.
Bond Strengths18~20
MPa.
Careful dentin conditioning,
Coupled with hydrophilic primer,Bond Strength22~35MPa.
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The Development of DBA
Enamel etch (1955)
Dentine etch (1960)
Treatment of smear layer (1980)
Wet Bonding technique(1990)
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First generationSecond generation
Third generationFourth generation: Total etch technique
Fifth generation: One bottle systemSixth generation: All in one,2000
Seventh generation
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Cavity PreparationThree designs of cavity preparation:
1.Conventional
2.Beveled conventional
3.Modified
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Beveled conventional cavity preparations
are similar to conventional preparation,
in that the outline form has external,box-like walls, but with beveled
enamel margin.
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Beveled enamel margin
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Beveled conventional cavity designs for
Class, andpreparations
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The advantages :
The ends of enamel rods are more etched
The increase in etched surface results in
a stronger bond
Increase the retention and reduce marginalleakage and discoloration.
More esthtically
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Modified cavity preparation
Have neither specified cavity wall structure
nor specified pulpal depth, and have enamel
margins.
Conserve more tooth structure.
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Modified cavity preparation
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Initial Clinical Procedure
Local anesthesia
Preparation of the operating site
Shade selection
Isolation of the operating site
with rubber dam or cotton rolls
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Rubber dam
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Clinical Procedure
Cavity preparation
Acid etching enamel & conditioning dentin
Matrix application
Application of bonding agent
Insertion of composite
Finishing procedures
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Matrix application
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Final proceduresFinal procedures
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Cases
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Conservative Operative DentistryMinimal intervention dentistry
is regards as a main stream
in caries treatment in the 21st
century.
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Principles of Minimal Interventiondentistry
Remineralization of early lesions
Reduction in cariogenic bacteria, toelminate the risk of further demi-neralization and cavitation
Minimum surgical intervention of ca-
vitated lesionsRepair rather than replacement of
defective restorations
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The day is surely coming, and perhapswithin the lifetime of you young men
before me, when we will be engaged inpracticing preventive, rather thanreparative, dentistry.
GV Black in 1896
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