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[Nd:YAG laser influence on micro-tensile bond strength of different bonding systems to non-carious sclerotic dentin]
Hai-yan Sun1, Li-hong Qiu, Zi-mu Li
1Department of Endodontics, School of Stomatology, China Medical University, Shenyang 110002, Liaoning Province, China. haiyan2002love@yahoo.com.cn
Purpose:
To investigate the influence of Nd:YAG laser on micro-tensile bond strength of different adhesive systems to non-carious sclerotic dentin.
Methods:
Fifteen human occlusal wearing molars which were above degree three were selected and cut into nearly equal halves,divided into A(A1,A2),B(B1,B2) and C(C1,C2) three groups at randomly. Then the teeth were processed with Nd:YAG laser(1W, 10Hz),teeth in A2 and C1 were combined with Scotchbond, A1 and B1 were combined with Adper Prompt L-Pop,and B2 and C2 were combined with Clearfil SE Bond, filling with composite resin(Z350) and saving in normal saline (37 degrees centigrade) for 24 hours.Then fatigue test pieces were made, the micro-tensile bond strength was evaluated and every specimen was examined under stero- microscope.The micro-tensile bond strength was performed using one-way analysis of variance using SPSS13.0 software package.
Results:
The micro-tensile bond strength of the three groups were Scotchbond (22.96 + or - 4.93)MPa, Adper Prompt L-Pop(18.73 + or - 4.71)MPa, Clearfil SE Bond(19.81 + or - 5.36)MPa. The bond strength of Scotchbond compared with the other two bonding systems was statistically significant.The breakage mostly happened in adhesive dentine surface.
Conclusion:
Non-carious sclerotic dentin which is processed with Nd:YAG laser associated with Scotchbond has better bonding strength.
