Effect of cavity preparation instruments (oscillating or rotating) on the composite-dentin interface in primary teeth.
OBJECTIVE
To evaluate the effect of preparation of instruments on the interfacial integrity between cavity wall and composite restoration.


METHODS
Two class II slot preparations were done in 10 primary teeth either with SonicSys or with a conventional bur. The cavities were filled using an adhesive system. One layer of a flowable composite and one layer of a condensable composite were applied. The specimens were analyzed by confocal laser scanning microscopy.


RESULTS
In the SonicSys group the mean thickness of the hybrid layer was 6.12 (0.60) microm; in the control group it was 6.04 (0.63) microm. The difference was not statistically significant. Two fractures were observed in one tooth of each group. These were located only in the enamel. The cavity margins were beveled in all specimens.


CONCLUSIONS
Compared to conventional preparations, cavity preparation with SonicSys has no deleterious effect on the integrity of the interface.
Pioch
Thomas
T
Department of Restorative Dentistry, University of Heidelberg, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany. thomas_pioch@me.uni-heidelberg.de
García-Godoy
Franklin
F
Duschner
Heinz
H
Koch
Martin J
MJ
Staehle
Hans J
HJ
Dörfer
Christof E
CE
D003188:Composite Resins; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000295:instrumentation*; D003754:Dental High-Speed Equipment; D003763:Dental Leakage / Q000517:prevention & control; D003793:Dental Restoration, Permanent; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D006801:Humans; D018613:Microscopy, Confocal; D019279:Resin Cements; D018709:Statistics, Nonparametric; D014094:Tooth, Deciduous; D014465:Ultrasonics
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C078484:Syntac dentine adhesive