Importance of three techniques of cavity preparation and three adhesive systems on microleakage of composite resin restorations / Importância de três técnicas de preparo cavitário e de três sistemas adesivos na microinfiltração marginal em restaurações Classe V de resina composta




This in vitro study compared the microleakage of class V resin composite restorations placed in cavities prepared with high-speed dental bur (AR), ultrasonic preparation devices (US) and high-speed dental bur plus ultrasonic preparation devices(AR+US), and restored using three different adhesive systems (One all etch Single Bond (SB) , and two Self-etch Clearfil CSE bond (CSE), Prompt L-Pop (POP)). Nine groups (n= 14) of human third molars each were prepared on the bucal and lingual surfaces were formed: Group 1- AR/SB; Group 2 AR/CSE; Group3 AR/POP; Group4 US/SB; Group 5 US/CSE; Group 6 US/POP; Group 7 AR+US/SB; Group 8 - AR+US/CSE; Group 9 - AR+US/POP. Specimens were built up with Z250/3M ESPE composite and stored in distilled water at 37°C for 24 hours. Then, the restorations were polished and the specimens thermocycling (1000 cycles/ 5°- 55°C), put impermeable, immersed in a 50% silver nitrate solution for 8 hours, sectioned, immersed in a photographic developer solution at darkness for 16 hours, and analyzed for leakage at the oclusal and cervical interface using an optical microscope connected to a video camera. The images were digitalized and software was utilized for microleakage assessment. Upon analyzing the results using a Split-plot ANOVA no statistically significant differences (p<0,05) between the cervical and oclusal interfaces for all groups was observed. The average of the interfaces was held and a Two-Way ANOVA revealed differences in microleakage among the tested groups (p=0,05). Tukey Test for Multiple Comparisons (p=0,05) demonstrated no significant difference between the groups restored with total etch adhesive system (SB), the groups restored with CSE and POP showed the least microleakage for the group prepared with the US and AR/US. The group US/CSE had the lowest microleakage and the group AR/POP had the highest. In the conditions of this study, we can conclude that the method of cavity preparation may affect the microleakage when a selfetch adhesive system is used.


cvd ultrasound microleakage adaptação marginal cvd adhesive systems sistemas adesivos marginal adaptation microinfiltração ultrassom

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