Efeito da solução de armazenamento na resistência de união entre cimento resinoso e resina composta

Abstract

The aim of this study was to evaluate the effect of the storage methodology on the bond strength between a resin cement and a composite resin. TPH composite resin was used to fill a silicone mold (10.0mm x 6.0mm), resulting in two cylindrical blocks. Their bases were polished with silicon carbide sandpaper (#600) and Single Bond 2 adhesive was applied. Fill Magic Dual Cement was used to cement the two resin blocks. After 24 hours, the set was sectioned into 15 stick-shaped specimens (1.0mm2 cross-sectional area). For the control group (Group I), five specimens (n=5) were randomly selected and tested using a Micro Tensile Tester-MTT machine, under a 500N load cell and 1.0mm/minute speed. Five specimens were randomly selected to form the water storage group (Group II) and the remaining five assigned to the alcohol storage group (Group III). After storage for two months, each specimen was subjected to a tensile test under the same conditions previously described in Group I. The values ​​were submitted to ANOVA and the Tukey test at a 95% confidence level. The results revealed that the control group (23.7 ± 6.7Mpa) showed a significant difference in relation to the group stored in water (14.2 ± 1.6MPa) and the group stored in alcohol (8.1 ± 2.7Mpa), after two months, p<0 .05. There was no statistically significant difference between storage groups II and III. Both storage methodologies were able to reduce the bond strength value.