Microleakage of Class V compomer resin restorations after conventional diamond bur and Er, Cr:YSGG laser preparation

Abstract

Objectives: The aim of this study was to compared the microleakage of Class V compomer resin restorationsprepared by Er,Cr:YSGG laser or conventional diamond bur. Materials and Methods: Ninety sound primary molar teeth were randomly assigned to the six study groups,pretreated as follows: Group 1:2W-10Hz Er,Cr:YSGG laser irradiation; Group2:2W-20Hz Er,Cr:YSGG laserirradiation; Group3:2,5W-10Hz Er,Cr:YSGG laser irradiation; Group4:2,5W-20Hz Er,Cr:YSGG laserirradiation; Group5: 3W-10Hz Er,Cr:YSGG laser irradiation; and Group6:3W laser-20Hz Er,Cr:YSGG laserirradiation. Each tooth hosted one test cavity prepared with one of the Er,Cr:YSGG laser irradiation and onecontrol cavity prepared with a conventional diamond bur in a high-speed hand piece. Both cavities were placedat the cervical margin of the tooth and were restored and finished according to the manufacturer s instructions.All the restorations were subjected to thermocycling and load cycling. Microleakage was assessed using 0.5%basicfuchsin solution and the specimens were sectioned longitudinally in buccolingual direction. Dyepenetration was scored based upon the extent of the dye using a stereo-microscope. The data were analyzedusing the Kruskal-Wallis and Wilcoxon Signed Ranks Test.Results: There were no statistically significant differences in microleakage (p>0.05) at either enamel or dentine margins among experimental groups. Lased groups resulted with statistically significant less microleakagecompared to controls at both enamel and dentine margins in Groups 4 and 6 (p