Operative Dentistry. Cavity Preparations. Indication of Operative Dentistry. Caries ; Malformed, discolored, or fractured teeth; Restoration replacement. Tooth-colored restoration. For Class Ⅲ ， Ⅳ and Ⅴ ， Esthetic Dentistry For Class Ⅰand Ⅱ ， .
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or fractured teeth;
For Class Ⅲ，Ⅳ and Ⅴ，
For Class Ⅰand Ⅱ，
What is their working mechanism?
What are the cavity preparation futures for tooth-colored restoration?
What are the advantage & disadvantage
of tooth-colored restoration?
Adhesion is a process of solid and/or
liquid interaction of one material with
another at a single interface.
Enamel bongding depends on resin tags
becoming interlocked with the surface
irregularities created by etching.
Microtags: smaller tags form across
the end of each rod.
Macrotags and microtags are the basis
for micro-mechanical bonding.
The difficulties of dentin bonding:
More water---wet bonding
Richer organic---collagen network
to micro-mechanical bonding to the
intertubular dentin which occures
between tubules along the cut dentin
Early DBA were hydrophobic, bonded
directly to the dentin smear layer.
Later DBA removed the smear layer but
tended to over-etch dentin.
Careful dentin conditioning,
Coupled with hydrophilic primer,
Enamel etch (1955)
Dentine etch (1960)
Treatment of smear layer (1980)
Wet Bonding technique(1990)
Fourth generation: Total etch technique
Fifth generation: One bottle system
Sixth generation: All in one,2000
Three designs of cavity preparation:
are similar to conventional preparation,
in that the outline form has external,
“box-like” walls, but with beveled
Class Ⅲ, Ⅳ and Ⅴ preparations
The ends of enamel rods are more etched
The increase in etched surface results in
a stronger bond
Increase the retention and reduce marginal
leakage and discoloration.
Have neither specified cavity wall structure
nor specified pulpal depth, and have enamel
Conserve more tooth structure.
Preparation of the operating site
Isolation of the operating site
with rubber dam or cotton rolls
Acid etching enamel & conditioning dentin
Application of bonding agent
Insertion of composite
Minimal intervention dentistry
is regards as a main stream in caries treatment in the 21st century.
within the lifetime of you young men
before me, when we will be engaged in
practicing preventive, rather than reparative, dentistry. ”