[Effect of pulse Nd:YAG laser on micro-tensile bond strength of non-carious sclerotic dentin to resin].

PURPOSE

To evaluate the microtensile bond strength of pulse Nd:YAG laser to non-carious sclerotic dentin.

METHODS

Ten extracted human teeth with dental attrition on occlusal surface were cut into nearly equal halves(about 12 mm(2)),and randomly divided into two groups with 10 in each group.All teeth were bonded using an all-in-one self-etch dentin adhesive(Adper Prompt L-Pop) to composite resin after the teeth in the experimental group were processed with pulse Nd:YAG laser(1 W,10 Hz). After 24 hours,under copious water spray the teeth were sectioned into 0.8 mm x 0.8 mm columns with silicon carbide dish at low speed. The microtensile bond strengths of samples were measured.Each fractured specimen was examined under stero-microscope. Paired t test was used for analysis of the microtensile bond strengths between the two groups with SPSS13.0 software package.

RESULTS

The microtensile bond strength in the experimental group and control group was (18.94+/-6.81)MPa and (15.76+/-5.61)MPa, respectively, the difference of these two groups was statistically significant(P<0.05). The fractured adhesive dentin surface was mainly adhesive failure mode.

CONCLUSION

Pulse Nd:YAG laser(1 W,10 Hz) can improve the strength of composite resin bonding to sclerotic dentin.