Effect of dentin pretreatment and curing mode on the microtensile bond strength of self-adhesive resin cements.
OBJECTIVE
The aim was to evaluate the effect of curing mode and different dentin surface pretreatment on microtensile bond strength (µTBS) of self-adhesive resin cements.


METHODS
Thirty-six extracted human permanent molars were sectioned horizontally exposing flat dentin surface. The teeth were divided into 12 groups (3 teeth/group) according to the dentin surface pretreatment methods (control, 18% EDTA, 10% Polyacrylic acid) and curing mode (self-curing vs. light-curing) of cement. After pretreatment, composite resin blocks were cemented with the following: (a) G-CEM LinkAce; (b) RelyX U200, followed by either self-curing or light-curing. After storage, the teeth were sectioned and µTBS test was performed using a microtensile testing machine. The data was statistically analyzed using one-way ANOVA, Student T-test and Scheffe's post-hoc test at P<.05 level.


RESULTS
For G-CEM LinkAce cement groups, polyacrylic acid pretreatment showed the highest µTBS in the self-cured group. In the light-cured group, no significant improvements were observed according to the dentin surface pretreatment. There were no significant differences between curing modes. Both dentin surface pretreatment methods helped to increase the µTBS of RelyX U200 resin cement significantly and degree of pretreatment effect was similar. No significant differences were found regarding curing modes except control groups. In the comparisons of two self-adhesive resin cements, all groups within the same pretreatment and curing mode were significantly different excluding self-cured control groups.


CONCLUSIONS
Selecting RelyX U200 used in this study and application of dentin surface pretreatment with EDTA and polyacrylic acid might be recommended to enhance the bond strength of cement to dentin.
Department of Conservative Dentistry, School of Dentistry, Pusan National University, Dental Reserch Institute, Yangsan, Republic of Korea.
Seung-Hyun
SH
Youm
Department of Conservative Dentistry, School of Dentistry, Pusan National University, Dental Reserch Institute, Yangsan, Republic of Korea.
Kyoung-Hwa
KH
Jung
Department of Conservative Dentistry, School of Dentistry, Pusan National University, Dental Reserch Institute, Yangsan, Republic of Korea.
Sung-Ae
SA
Son
Department of Dental Materials, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
Yong-Hoon
YH
Kwon
Department of Conservative Dentistry, School of Dentistry, Pusan National University, Dental Reserch Institute, Yangsan, Republic of Korea.
Jeong-Kil
JK
Park
Bond strength; Curing mode; Dentin surface pretreatment; Self-adhesive resin cements