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Marginal leakage in direct and indirect composite resin restorations in primary teeth: an in vitro study
1Dra. Meire Coelho Ferreira, Rua Doze, 648, Ilha dos Araújos, 35020-690 Governador Valadares-MG, Brazil. meirecofe@ig.com.br
Objective:
The aim of this study was to evaluate the marginal leakage in class II preparations, with margins in enamel, restored with composite resin indirect and direct restorations.
Methods:
Twenty extracted primary molars were chosen and divided at random into two groups: G1 (n=10) restored by a direct technique and G2 (n=10) restored by an indirect technique. The composite resin Filtek Z250 (3M) and the Adper Single Bond adhesive (3M) were used in both groups. Teeth were stored in a humid environment at 37 degrees C for 1 week, thermo cycled (500 cycles, 5 degrees C and 55 degrees C), sealed and immersed in a 0.5% basic fuchsine dye for 24h. Teeth were longitudinally sectioned, in a mesio-distal direction and leakage was assessed.
Results:
No leakage in the specimens from G2 and leakage in four specimens from G1, but the Mann-Whitney test showed that there was no statistically significant difference between the groups, either for occlusal box (p=0.317) and proximal box (p=0.067).
Conclusion:
This study demonstrated that direct and indirect class II composite resin restorations with cervical margins in enamel show similar results regarding marginal leakage.
