Aboobaker Shaheen, Nair Baiju Gopalan, Gopal Rajesh, Jituri Sandeep, Veetil Fazalu Rahman Pothu
Senior Lecturer, Department of Conservative Dentistry & Endodontics, Malabar Dental College and Research Centre , Edappal, Kerala, India .
Professor and Head of The Department, Department of Conservative Dentistry & Endodontics, Malabar Dental College and Research Centre , Edappal, Kerala, India .
J Clin Diagn Res. 2015 Feb;9(2):ZC17-20. doi: 10.7860/JCDR/2015/11609.5552. Epub 2015 Feb 1.
The purpose of this study was to evaluate and compare the fracture resistance of roots obturated with guttapercha using bonded amalgam, GC Light cure GIC (resin modified glass ionomer cement) and Tetric N Flow (flowable hybrid composite) as different intra orifice barriers.
Eighty freshly extracted mandibular premolars with straight roots were reduced to 14 mm from the coronal aspect. All canals were enlarged to size 30 and specimens were obturated with gutta percha cones, except for control group specimens the coronal 3 mm of root fillings of all other group specimens were removed with the aid of heated plugger. All samples were randomly divided into 4 groups of 20 specimens each. They were control, Fuji GC LC GIC, Tetric N Flow and Bonded Amalgam. After the placement of the intra orifice barrier materials, specimens stored at 37(o)C and 100% humidity for one week to allow the materials to set completely. After one week, all the groups were subjected to fracture resistance testing by using Universal testing machine.
Data was analysed for significance by ANOVA (Analysis of variance) and further pair wise comparison was performed by Benferroni test. Level of significance was taken as 0.05. Tetric N Flow group showed better fracture resistance as compared to all other groups and Control group is least among the groups. Fracture resistance of Tetric N Flow compared with bonded amalgam was statistically significant.
Tetric N Flow and Fuji GC LC GIC can be used as intra-orifice barriers with good fracture resistance in endodontically treated teeth.
本研究的目的是评估和比较使用粘结汞合金、GC光固化玻璃离子水门汀（树脂改性玻璃离子粘固剂）和Tetric N Flow（流动型混合复合材料）作为不同根管口屏障时，用牙胶尖充填的牙根的抗折性。
选取80颗新鲜拔除的直根下颌前磨牙，从冠方将其截短至14mm。所有根管均扩大至30号，并用牙胶尖充填标本，除对照组标本外，其他组标本根管充填物的冠方3mm用加热充填器去除。所有样本随机分为4组，每组20个标本。它们分别是对照组、富士GC LC玻璃离子水门汀组、Tetric N Flow组和粘结汞合金组。放置根管口屏障材料后，标本在37℃和100%湿度下储存一周，以使材料完全固化。一周后，所有组均使用万能试验机进行抗折性测试。
数据采用方差分析（ANOVA）进行显著性分析，并通过Bonferroni检验进行进一步的两两比较。显著性水平设定为0.05。与所有其他组相比，Tetric N Flow组显示出更好的抗折性，而对照组在各组中抗折性最低。Tetric N Flow组与粘结汞合金组的抗折性相比具有统计学显著性。
Tetric N Flow和富士GC LC玻璃离子水门汀可作为根管治疗牙齿中具有良好抗折性的根管口屏障。
