Liu Kun, Deng Jing, Zhang Hui-min, Yao Li-xia
Department of Stomatology, Qingdao University. Qingdao, China.
Shanghai Kou Qiang Yi Xue. 2011 Aug;20(4):381-4.
To evaluate the bond strength of a self-adhesive resin cement to dentin by pulse Nd:YAG laser.
Ten freshly extracted non-carious human premolars were cut into nearly equal halves and prepared to expose the dentin,randomly divided into two groups with 10 in each group:laser group and control group.All teeth were bonded using a self-adhesive resin cement to dentin after the teeth in the laser group were processed with pulse Nd:YAG laser(0.8W,10Hz) for 25s.After 24 hours under 37 degrees centigrade water,the shear bond strengths of specimens were measured.Each fractured specimen was examined under dental microscope. All statistical analysis was performed using SPSS 17.0 software package.Two new specimens were cut and the cement-dentin interfaces were observed under SEM.
The shear bond strength in the control group and laser group was (9.48±1.80)MPa and (11.15±1.71)MPa,respectively,the difference was statistically significant(P<0.05).Most of the fractured adhesive dentin surfaces were adhesive failure modes in the two groups. SEM observation of the cement-dentin interface in the two groups showed good adaptation,but resin tags were not observed.
Pulse Nd:YAG laser(0.8W,10Hz) can increase the bond strength of self-adhesive resin cement to dentin.
