Effect of different surface treatments on the shear and microtensile bond strength of resin-modified glass ionomer cement to dentin.
OBJECTIVE
The aim of this study was to evaluate the effect of different surface treatments on the microtensile bond strength (μTBS) and shear bond strength (SBS) of resin-modified glass ionomer cement (RMGIC) to dentin.


METHODS
Fifty-two extracted human molars were flattened to obtain dentin surfaces. For SBS assessment 40 teeth were divided into four groups according to their surface treatments (acid etching, Er:YAG laser QSP mode, Er:YAG laser MSP mode and control-SiC) (n = 10). A plastic cylinder was placed over the differently treated dentin surfaces and RMGIC was placed into the rings and polymerized. Twelve teeth were used for the μTBS test. The treated dentin surfaces described above were restored with 4 mm high RMGIC and light cured; then, the specimens were sectioned into serial sticks (n = 15) and μTBS and SBS were tested for failure in a testing machine with a 1 mm/min crosshead speed. The data were analyzed by one-way ANOVA and Tukey HSD tests (α = 0.05).


RESULTS
Acid etching showed significantly higher SBS than the other groups (p < 0.05). Er:YAG QSP and MSP-treated groups showed higher SBS values than the control group, but the difference was not statistically significant (p > 0.05). Er:YAG MSP showed the highest μTBS value followed by acid etching, whereas the control group exhibited the lowest value (p < 0.05) and the differences between the control group and Er:YAG QSP were not significant (p > 0.05).


CONCLUSIONS
The application of Er:YAG MSP mode and acid etching to dentin can be used for improving the bond strength of RMGIC.
Department of Pediatric Dentistry, Faculty of Dentistry, Sifa University , Izmir , Turkey.
Mustafa
M
Altunsoy
Murat Selim
MS
Botsali
Emre
E
Korkut
Ebru
E
Kucukyilmaz
Yagmur
Y
Sener
D000134:Acid Etching, Dental / Q000379:methods; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D053844:Lasers, Solid-State; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation / Q000379:methods; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D016369:Smear Layer / Q000648:ultrastructure; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
D005899:Glass Ionomer Cements; D010756:Phosphoric Acids; D019279:Resin Cements; C030242:phosphoric acid
Er:YAG lasers; acid etching; glass ionomer; shear strength; tensile strength