Composte Cavity Preparation

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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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Composte Cavity Preparation