Cecchin Doglas, Farina Ana Paula, Giacomin Mateus, Vidal Cristina de Mattos Pimenta, Carlini-Júnior Bruno, Ferraz Caio Cezar Randi
Department of Restorative Dentistry, College of Dentistry, University of Passo Fundo, Passo Fundo, Rio Grande do Sul, Brazil.
Department of Restorative Dentistry, College of Dentistry, University of Passo Fundo, Passo Fundo, Rio Grande do Sul, Brazil.
J Endod. 2014 Dec;40(12):2045-8. doi: 10.1016/j.joen.2014.08.019. Epub 2014 Oct 1.
The aim of this study was to investigate the effects of chlorhexidine (CHX) application time on the bond strength and durability of the adhesion of fiber posts relined with resin composite to the root dentin.
Eighty bovine incisor roots were divided into 4 groups after root preparation: control group (irrigation with physiological solution) and experimental groups, CHX for 30 seconds, CHX for 60 seconds, and CHX for 120 seconds. Fiber posts relined with resin composite were cemented with RelyX ARC. The Scotchbond Multi-Purpose total-etching adhesive system was used in half of the samples of each group, and the Clearfil SE Bond self-etching adhesive system was used in the other half. The samples were randomly divided into 2 subgroups, 24 hours of storage and 12 months of storage. All roots were sectioned transversely, and push-out tests were performed. Bond strength means were analyzed by analysis of variance and Tukey test (α = 0.05). Failure mode was determined by examining specimen's surfaces under scanning electron microscope, and its distribution was evaluated by using χ(2) test (α = 0.05).
CHX pretreatment resulted in homogeneous bond strength values at 24 hours and 12 months of storage, irrespective of the CHX application time and adhesive system (P < .05). A significant bond strength decrease was noticed after 12 months of storage when irrigation was performed with physiological solution in the control groups (P > .05). Significant differences were observed for fracture patterns (P < .001).
The use of CHX pretreatment could preserve the bond strength of the fiber post relined with resin composite to root dentin for 12 months, irrespective of the CHX application time and adhesive system used.
本研究旨在探讨洗必泰（CHX）处理时间对用树脂复合材料重新衬里的纤维桩与牙根牙本质之间粘结强度及粘结耐久性的影响。
80颗牛切牙根在根管预备后分为4组：对照组（用生理盐水冲洗）和实验组，分别用CHX处理30秒、60秒和120秒。用RelyX ARC粘结用树脂复合材料重新衬里的纤维桩。每组一半的样本使用Scotchbond多用途全酸蚀粘结系统，另一半使用Clearfil SE Bond自酸蚀粘结系统。样本随机分为2个亚组，分别储存24小时和12个月。所有牙根均横向切片并进行推出试验。粘结强度均值通过方差分析和Tukey检验进行分析（α = 0.05）。通过扫描电子显微镜检查样本表面确定失败模式，并使用χ²检验评估其分布（α = 0.05）。
无论CHX处理时间和粘结系统如何，CHX预处理在储存24小时和12个月时均产生均匀的粘结强度值（P <.05）。对照组用生理盐水冲洗，储存12个月后粘结强度显著降低（P >.05）。在断裂模式方面观察到显著差异（P <.001）。
使用CHX预处理可使用树脂复合材料重新衬里的纤维桩与牙根牙本质之间的粘结强度在12个月内得以保持，无论CHX处理时间和所使用的粘结系统如何。
