Influence of the use of Er:YAG laser for cavity preparation and surface treatment in microleakage of resin-modified glass ionomer restorations.
This study quantitatively assessed the amount of microleakage on Class V cavities prepared by Er:YAG laser and high-speed handpiece, varying the surface treatment and restoring with a resin-modified glass ionomer cement. Fifty cavities were prepared using either an Er:YAG laser device or a carbide bur at high speed. The surface treatment was performed as follows: Er:YAG laser irradiation (G1); 40% polyacrylic acid (G2); laser + acid (G3); finishing with low speed + laser + acid (G4); conventional bur preparation + acid (G5-control). The samples were restored with Fuji II LC, thermocycled, isolated and immersed in a 50% AgNO3 solution. The restorations were serially sectioned and the extent of dye penetration was measured in milimeters using specific computer software. Data were analyzed by two-way ANOVA and Tukey test. The lowest degree of microleakage was observed for G5, which was statistically similar (p>0.05) to G4 but different (p<0.05) from all the other experiental groups. Lesser microleakage was observed at the occlusal margins than at the cervical margins (p<0.05). It may be concluded that the use of Er:YAG laser for cavity preparation and surface treatment negatively affected the marginal sealing of resin-modified glass ionomer restorations.
Department of Restorative Dentistry, Ribeirão Preto Dental School, University of São Paulo, Brazil. rgpalma@forp.usp.br
Michelle A
MA
Chinelatti
Renata P
RP
Ramos
Daniela T
DT
Chimello
Maria C
MC
Borsatto
Jesus D
JD
Pécora
Regina G
RG
Palma-Dibb
D000704:Analysis of Variance; D003737:Dental Cavity Preparation / Q000295:instrumentation* / Q000379:methods*; D003755:Dental High-Speed Technique; D003763:Dental Leakage; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D004871:Erbium; D005899:Glass Ionomer Cements; D006801:Humans; D007834:Lasers / Q000009:adverse effects*; D008963:Molar; D012117:Resins, Synthetic
C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D012117:Resins, Synthetic; D004871:Erbium