AbstractThe purpose of this work was to study the compatibility of several commercially available
dentin adhesives with composite resins. In this study, V-shaped cavity preparations were
created on both buccal and lingual surfaces of 60 extracted huma...
AbstractThe purpose of this work was to study the compatibility of several commercially available
dentin adhesives with composite resins. In this study, V-shaped cavity preparations were
created on both buccal and lingual surfaces of 60 extracted human premolars(3mmX3mmX
2mm deep). Preparations were located such that the occlusal margins were on the enamel
and the gingival margins were on the cementum(lmm below the CEJ). These specimens
were randomly divided into three equal groups. Three dentin adhesives(Scotchbond Multi-
purpose, All Bond 2, Prisma Universal Bond 3) were applied to the cavity in accordance
with each manufacturer's instructions. The teeth in each group were restored with four
composite resins (Silux plus, Z100, Bisfil, Prisma TPH)in three increments, with each incre-
ment light-cured for 40 seconds. All specimens were exposed to 500 cycles of thermal
stress. Specimens then placed in a silver ni<rate solution(50% by weight) and stored in
darkness for 24 hours. They were then immersed for 6 hours in photographic developing
solution under flourescent light. Specimens were sectioned buccolingually through the center
of the restoration and observed under a binocular stereoscope. To compare the marginal
leakage, ANOVA and Dunkan's multiple range tests were used in analysis. Selected samples
were further studied using scanning electron microscopy(XL20, Philips, The Netherlands).The results were as follows.
1. In all groups, the enamel margin showed significantly less leakage than the cementum
margin.
2. No statistically significant differences were found in microleakage when composite resins
were used with their proprietary dentin adhesives.
3. In comparison between dentin adhesives, Prisma Universal Bond 3 showed significantly
less leakage at the enamel margin and Scotchbond multi-purpose showed significantly
less leakage at the cementum margin than -the other groups.
4. In comparison between composite resins, Silux Plus showed significantly more leakage
than other groups at the enamel margin and no statistically significant differences were
found in microleakage at the cementum margin.
5. According to the backscattered scanning electron microscope, microleakage occurred
via gaps at the dentin adhesives/dentin interface