Marginal microleakage of cavities prepared with Er:YAG laser on primary teeth in vitro / 北京大学学报(医学版)

ABSTRACT

Objective:To investigate the marginal microleakage after cavity preparation by ErYAG la-ser and conventional bur applying different adhesive systems , conditioning surface with acid etching or not.Methods:In the study, 50 primary teeth were divided into 5 groups.(1) Bur+etch-and-rinse sys-tem, (2) Bur+self-etching system, (3) ErYAG laser+etch-and-rinse system, (4) ErYAG laser+self-etching system, (5) ErYAG laser+none-etched.The class V cavities were all filled with composite resin.The microleakage tests were performed , observed and scored under stereomicroscope .Results:Bur+etch-and-rinse group had higher microleakage than ErYAG laser +etch-and-rinse group , and Bur+self-etching group had higher microleakage than ErYAG laser +self-etching group ( P<0 .05 ) . There was no difference between ErYAG laser+etch-and-rinse group and ErYAG laser+self-etching group, while they had significantly lower microleakage than that of ErYAG+none-etched group.Con-clusionComposite resin restoration showed less marginal microleakage when all-in-one self-etch system was used after irradiation by ErYAG laser on primary teeth .