Department of Prosthodontics, Hatay Mustafa Kemal University, Faculty of Dentistry, Hatay, Turkey.
Department of Prosthodontics, Gazi University, Faculty of Dentistry, Ankara, Turkey.
Biomed J. 2019 Feb;42(1):53-58. doi: 10.1016/j.bj.2018.12.003. Epub 2019 Mar 20.
Restoration of the teeth with extensive root canals with different post systems is a challenge for clinicians. Evaluation of these systems is important for clinical success. The aim of this study was to compare the fracture resistance and fracture mode of endodontically treated thin-walled teeth which restored with different post systems.
Eighty extracted and endodontically treated maxillary canines were divided into 4 groups (n = 20) and the thickness of the radicular dentin walls was reduced by using diamond burs. Each root was embedded in an autopolymerizing resin with a 0.25 mm layer of vinyl polysiloxane material to simulate the periodontal ligament. The subgroups were restored with one of the following post systems: only composite resin (Group 1), cast post (Group 2), glass-fiber post (Group 3), and I-TFC post (Group 4). The samples were subjected to a gradually increasing force (0,5 mm/min). The force required to fracture was recorded, and the data were analyzed with ANOVA, Tukey test's and Chi-Square test (p < 0.05).
The highest fracture resistance was recorded for Group 2, followed by the Group 3, Group 4, and Group 1. Differences in the fracture resistance of teeth were significant among the groups (p < 0.05). The fracture resistance of Group 4 was significantly different than the other tested post systems (p < 0.05).
The lowest fracture resistance was recorded for Group 1, but among all post systems, Group 4 had the lowest fracture resistance. The fracture mode of the fiber posts (Radix and I-TFC posts) would permit repair of the tooth.
用不同的桩系统修复有广泛根管的牙齿是临床医生面临的挑战。评估这些系统对于临床成功很重要。本研究的目的是比较不同桩系统修复的薄壁根管牙的抗折强度和折裂模式。
从 80 颗上颌尖牙中提取并进行根管治疗，将其分为 4 组（n=20），并用金刚石磨头减少根管壁的根向牙本质厚度。每个牙根都用自聚合树脂嵌入，树脂层中有 0.25mm 厚的乙烯基聚硅氧烷材料模拟牙周膜。亚组用以下一种桩系统修复：仅复合树脂（第 1 组）、铸造桩（第 2 组）、玻璃纤维桩（第 3 组）和 I-TFC 桩（第 4 组）。样品以 0.5mm/min 的逐渐增加的力进行测试。记录断裂所需的力，使用方差分析、Tukey 检验和卡方检验（p<0.05）对数据进行分析。
第 2 组的抗折强度最高，其次是第 3 组、第 4 组和第 1 组。组间牙齿抗折强度差异有统计学意义（p<0.05）。第 4 组的抗折强度与其他测试的桩系统有显著差异（p<0.05）。
第 1 组的抗折强度最低，但在所有桩系统中，第 4 组的抗折强度最低。纤维桩（Radix 和 I-TFC 桩）的折裂模式允许修复牙齿。
