摘要
Abstract
BACKGROUND:The bonding interface of resin cements with dentin is unstables, therefore, improvement on the bonding strength is of great significance. OBJECTIVE:To evaluate the effects of different pretreatments to post space on bonding strength of the self-adhesive resin cement EmbraceCoreTM Resin Cement to fiber posts after phosphoric acid etching or self-etching. METHODS:Twenty-five human mandible canines or premolars with single-rooted canal were selected. After conventional root canal treatment and post space preparation, they were randomly divided into five groups (n=5 per group):group I (control group):0.9%normal saline irrigation;group II:etching with 35%phosphoric acid for 15 seconds;group III:self-etching with CLEARFILTM SE BOND binder for 20 seconds;group IV:etching with 35%phosphoric acid for 15 seconds and bonding with single bong 2;group V:self-etching with CLEARFILTM SE BOND binder for 20 seconds and bonding with CLEARFILTM SE BOND binder. Fiber posts were edusing self-adhesive resin cement EmbraceCoreTM Resin Cement. The thin-slice push-out test was performed to record the bonding strengths, and the failure modes of fiber posts were observed by stereomicroscope. RESULTS AND CONCLUSION:The bond strength of groups I-V were as fol ows:(8.66±2.43), (7.05±3.0), (7.37±2.83), (9.88±2.9), and (10.04±2.86) MPa. Groups II, IV and V showed significantly different bond strength from the group I (P<0.05), but there were no significant differences between groups III and I (P>0.05). The main failure models in the groups I, II and III were A1 and A2, and less B1 and B2 appeared. The failure modes in the groups IV and V also focused on the A1 and A2, but B1 and B2 increased gradual y. These results indicate that neither the pretreatments by phosphoric acid etching nor by self-etching in root canal dentin can improve the bonding strength of EmbraceCoreTM Resin Cement to fiber posts, but the use of binder relative to phosphoric acid etching or self-ctching is helpful.关键词
生物材料/口腔生物材料/磷酸酸蚀/自酸蚀/粘接剂/自粘接树脂水门汀/桩道/纤维桩/粘接强度/微推出实验Key words
Tooth Preparation, Prosthodontic/Dental Cement/Tissue Engineering分类
医药卫生
