Abed Kahnamouei Mahdi, Safyari Leila, Savadi Oskoee Siavash, Mohammadi Narmin, Safarvand Hossein, Bahari Mahmoud, Kimyai Soodabeh, Ebrahimi Chaharom Mohammad Esmaeel
Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Dental and Periodontal Research Center, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Iran Endod J. 2019 Summer;14(3):202-210. doi: 10.22037/iej.v14i3.24310.
Relining fiber posts using composite resins helps the posts adapt to the anatomical space of the root canals. The aim of this study was to evaluate the effect of composite resin type on the push-out bond strength of anatomical fiber posts to intra canal dentin.
Forty-eight bovine upper incisors were prepared for post space after root canal therapy and randomly divided in to six groups. Five different types of composite resin (GrandioSO, GrandioSO Heavy Flow, X-tra Fil, X-tra base and everX Posterior) were used for relining the prepared fiber posts. In the control group, the prepared post was cemented into the post space without relining. Cervical, middle and apical cross-sections were achieved from each root and push-out test was conducted at a crosshead speed of 0.5 mm/min. One sample from each group was scanned using a micro-CT scanner which provided views from the apical, middle and coronal thirds. Data were analyzed using Kolmogorov-Smirnov test, repeated measures ANOVA and post hoc tests using SPSS 17 (<0.05).
Statistical analysis showed significant differences in terms of mean push-out bond strengths between different composite resin types and cross-sections (<0.001). The mean push-out bond strength of the samples relined with Grandio SO composite resin (15.48±2.32) and X-tra Fil Bulk-fill composite resin (14.09±1.98) were significantly higher than that of other groups (<0.05). The unrelined group had a mean push-out bond strength (5.94±1.45) which was significantly lower than that in other groups (<0.05). In addition, there was a relationship between cross-sections and composite resin types (<0.05).
This study showed that the composite resins used for relining can affect the push-out bond strength to intra canal dentin based on their physical and mechanical properties.
使用复合树脂对纤维桩进行重衬有助于桩适应根管的解剖空间。本研究的目的是评估复合树脂类型对解剖型纤维桩与根管内牙本质之间推出粘结强度的影响。
48颗牛上颌切牙在根管治疗后制备桩道空间，并随机分为六组。使用五种不同类型的复合树脂（GrandioSO、GrandioSO Heavy Flow、X-tra Fil、X-tra base和everX Posterior）对制备好的纤维桩进行重衬。在对照组中，将制备好的桩粘结到桩道空间中，不进行重衬。从每个牙根获取颈部、中部和根尖横截面，并以0.5 mm/min的十字头速度进行推出试验。使用微型CT扫描仪对每组的一个样本进行扫描，该扫描仪提供根尖三分之一、中部三分之一和冠部三分之一的视图。使用SPSS 17软件进行Kolmogorov-Smirnov检验、重复测量方差分析和事后检验（<0.05）。
统计分析表明，不同复合树脂类型和横截面之间的平均推出粘结强度存在显著差异（<0.001）。用Grandio SO复合树脂重衬的样本（15.48±2.32）和X-tra Fil Bulk-fill复合树脂重衬的样本（14.09±1.98）的平均推出粘结强度显著高于其他组（<0.05）。未重衬组的平均推出粘结强度（5.94±1.45）显著低于其他组（<0.05）。此外，横截面与复合树脂类型之间存在关系（<0.05）。
本研究表明，用于重衬的复合树脂可根据其物理和机械性能影响与根管内牙本质的推出粘结强度。
