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[Marginal microleakage of cavities prepared with Er:YAG laser on primary teeth in vitro]
Yao Xie1, Sun Zhang2, Li-hong Ge2
1Department of Endodontic Dentistry, First Clinical Divison, Peking University School and Hospital of Stomatology, Beijing 100034, China.
Objective:
To investigate the marginal microleakage after cavity preparation by Er:YAG laser 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 system, (2) Bur + self-etching system, (3) Er:YAG laser + etch-and-rinse system, (4) Er:YAG laser + self-etching system, (5) Er:YAG 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 Er:YAG laser+etch-and-rinse group, and Bur+self-etching group had higher microleakage than Er:YAG laser + self-etching group(P<0.05). There was no difference between Er:YAG laser + etch-and-rinse group and Er:YAG laser + self-etching group, while they had significantly lower microleakage than that of Er:YAG + none-etched group.
Conclusion:
Composite resin restoration showed less marginal microleakage when all-in-one self-etch system was used after irradiation by Er:YAG laser on primary teeth.
