Oper Dent. 2021 Jul 1;46(4):467-475. doi: 10.2341/20-194-L.
To evaluate the effects of mechanical versus chemical cleaning protocols for cleaning the root dentin surface before cementation of fiberglass posts for their effect on the bond strength, failure mode, and dentinal penetration of the cementing agent using an etch-and-rinse adhesive system on dentin prepared to receive a fiberglass post.
Forty roots of bovine teeth were endodontically treated and prepared for fiber post cementation. The specimens were randomized into 4 groups of 10: Control group (CO) - irrigation with 2.5% NaOCl; DW group- irrigation with distilled water; RB group - rotating brush for cleaning root canals, and CUI group - continuous ultrasonic irrigation. The fiberglass posts were cemented, and the specimens were immersed in distilled water for 6 months. A push-out test was performed on the cervical, middle, and apical thirds of the samples. Dentinal penetration of the cementing agent and the fracture pattern were evaluated by laser confocal microscopy. Statistical analysis was performed using analysis of variance (ANOVA) and post hoc Tukey tests (α=0.05). Results: The RB and CUI groups showed significantly higher bond strength values when compared to the Control and DW groups (p<0.05). In addition, in the control and DW groups, the apical third presented lower bond strength values when compared to middle and cervical thirds.
While DW showed the highest incidence of adhesive type failure, CUI resulted in the highest dentinal penetration of the cementing agent (p<0.05). RB and CUI resulted in the highest bond strength between cementation system and root dentin. In addition, CUI favored greater dentinal penetration of fiberglass post cementing agent.
评估机械与化学清洗方案在使用酸蚀-冲洗粘接系统对纤维桩核预备的牙本质进行粘接时，对纤维桩核固位力、失效模式和粘接剂牙本质渗透的影响，比较两种方案在纤维桩核修复前对根管牙本质表面清洁效果的差异。
40 颗牛牙的根管经牙髓治疗并预备用于纤维桩核修复。将样本随机分为 4 组，每组 10 个：对照组（CO）-用 2.5%次氯酸钠冲洗；去离子水组（DW）-用去离子水冲洗；旋转毛刷组（RB）-根管清洗用旋转毛刷，连续超声冲洗组（CUI）。将纤维桩核粘固，将样本浸泡在蒸馏水中 6 个月。在样本的颈、中、根尖三分之一处进行推出试验。用激光共聚焦显微镜评估粘接剂的牙本质渗透和断裂模式。使用方差分析（ANOVA）和事后 Tukey 检验（α=0.05）进行统计分析。
与对照组和 DW 组相比，RB 和 CUI 组的粘结强度值显著更高（p<0.05）。此外，在对照组和 DW 组中，根尖三分之一的粘结强度值低于中颈三分之一。
DW 组显示出最高比例的粘接力失效类型，而 CUI 组则导致粘接剂对牙本质的渗透最高（p<0.05）。RB 和 CUI 组在粘接系统与根管牙本质之间产生了最高的粘结强度。此外，CUI 有利于纤维桩核粘接剂更大程度地渗透到牙本质中。
