Influence of Er:YAG laser on cavity preparation and surface treatment in microleakage of composite resin restorations.
OBJECTIVE
The purpose of this study was to assess microleakage on class V cavities prepared by Er:YAG laser with varying surface treatment.


BACKGROUND
There has been little reported research on microleakage at cavities prepared and treated with Er:YAG laser.


METHODS
Fifty preparations using Er:YAG laser or a highspeed handpiece were developed. The surface treatment was performed as follows: Er:YAG laser (group 1); 35% phosphoric acid (group 2); laser + acid (group 3); finishing with low-speed + laser + acid (group 4); conventional preparation developed with a high-speed handpiece + acid (group 5--control). The samples were restored with Single Bond/Z250, thermocycled, isolated, and immersed in a 50% AgNO(3) solution. The restorations were sectioned, and the microleakage was measured in milimeters using a specific computer software. Data were analyzed employing ANOVAand Tukey test.


RESULTS
Statistical analysis showed that group 5 (G5) obtained the lowest results of microleakage (22.05%), and it was statistically similar (p > 0.05) to G1 (37.7%) and different (p < 0.05) from the other groups (G2 = 50.4%; G3 = 43%; G4 = 44.2%). The occlusal margins (22.62%) demonstrated less microleakage (p < 0.05) than the cervical margins (56.32%).


CONCLUSIONS
The use of Er:YAG laser for cavity preparation and surface treatment negatively influenced the marginal sealing of composite resin restorations.
Chinelatti
Michelle A
MA
Department of Operative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo (USP), Brazil.
Ramos
Renata P
RP
Chimello
Daniela T
DT
Corona
Silmara A M
SA
Pécora
Jesus D
JD
Dibb
Regina G Palma
RG
D003188:Composite Resins; D003737:Dental Cavity Preparation / Q000379:methods*; D003763:Dental Leakage / Q000517:prevention & control; D006801:Humans; D066298:In Vitro Techniques; D007834:Lasers
D003188:Composite Resins