[Effect of different surface managements on micro-tensile bond strength of non -carious sclerotic dentin to resin].
OBJECTIVE
To evaluate the micro-tensile bond strength of 3 different surface managements to non-carious sclerotic dentin.


METHODS
Fifteen periodontal patients' occlusal wearing molars which were above 3rd degree were selected. The teeth were equally cut into two pieces along the buccolingual direction, and each piece was randomly divided into 3 groups. Group 1 was processed with polishing, group 2 was processed with EX-26 diamond bur and group 3 was processed with 5# round bur. All teeth were subjected to Optibond treatment, and then filled with composite resin (Premisa) and saved in normal artificial saliva (37 degrees centigrade) for 24 hours. At last, 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 analyzed with one-way analysis of variance using SPSS17.0 software package.


RESULTS
The micro-tensile bond strength of the 3 groups were (10.48±1.29) MPa, (21.52±0.97) MPa and(16.30±1.02) MPa, respectively. The bond strength of EX-26 diamond bur group was significantly greater than that of the other 2 groups (P<0.05). The bond strength of 5# round bur group was significantly greater than that of polishing group (P<0.05). The breakage mostly happened in adhesive dentine surface.


CONCLUSIONS
Non-carious sclerotic dentin which is processed with diamond bur has better micro-tensile bonding strength.
Department of Endodontics, School of Stomatology, China Medical University, Liaoning Institute of Dental Research. Shenyang 110002;China.E-mail:15524299929@163.com.
Xue
X
Wang
Li-hong
LH
Qiu
Zi-mu
ZM
Li
Hai-yan
HY
Sun
D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008963:Molar; D019279:Resin Cements; D013499:Surface Properties; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents; C092987:Optibond; D019279:Resin Cements