Department of Pedodontics and Preventive Dentistry, Surendera dental college and hospital, Sri Ganganagar 335001, Rajasthan, India.
Clin Oral Investig. 2012 Dec;16(6):1627-33. doi: 10.1007/s00784-012-0673-9. Epub 2012 Jan 14.
The aim of this study was to evaluate the effect of post system and length on the fracture resistance of endodontically treated human anterior teeth.
Seventy-five extracted human incisors were endodontically treated, out of which 60 were decoronated 2 mm above the cementoenamel junction and divided into two experimental groups based on the type of post system to be used: glass fiber post (GFP) and Ribbond fiber post groups (RFP). Endodontically treated human anterior teeth in which no post was placed served as control group. Each group was divided into two subgroups according to the length of post space: 5 and 10 mm and all the samples were restored with metal crowns. The fracture resistance was measured by applying loads at an angle of 130° to the long axis of teeth in an Instron universal testing machine.
The results revealed that GFP group at 10-mm post space length showed the significantly highest fracture resistance (740.2133 N) among all groups and subgroups. Decrease in post length resulted in the decrease in fracture resistance in GFP group (425.1867 N), whereas in group RFP 5-mm subgroup (299.6200 N) showed significantly higher fracture resistance than 10-mm subgroup (216.9300 N) but lesser than the control (437.8733 N) in both the subgroups.
Glass fiber posts efficiently increase the fracture resistance of an endodontically treated tooth but the determination of optimal post length is also essential.
The present investigation highlights the significance of using glass fiber posts in the restoration of endodontically treated teeth. Endodontically treated teeth restored with glass fiber posts showed increased fracture strength and favorable mode of fracture, and are therefore highly recommended to achieve better clinical outcomes.
本研究旨在评估不同的核桩系统和长度对根管治疗后的人上前牙抗折能力的影响。
将 75 颗人离体前磨牙进行根管治疗，其中 60 颗牙冠在釉牙骨质界上方 2mm 处截冠，并根据要使用的核桩系统类型分为两组实验：玻璃纤维桩（GFP）组和 Ribbond 纤维桩（RFP）组。未放置核桩的根管治疗后的人上前牙作为对照组。每组根据核桩空间长度进一步分为 5mm 和 10mm 两个亚组，所有样本均用金属冠修复。在英斯特朗万能试验机上以 130°的角度向牙长轴施加载荷来测量抗折能力。
结果表明，所有组和亚组中 GFP 组在 10mm 核桩空间长度时表现出最高的抗折能力（740.2133N）。核桩长度的减少导致 GFP 组的抗折能力下降（425.1867N），而 RFP 组 5mm 亚组（299.6200N）的抗折能力显著高于 10mm 亚组（216.9300N），但低于对照组（437.8733N）。
玻璃纤维桩能有效提高根管治疗后牙的抗折能力，但确定最佳核桩长度也很重要。
本研究强调了在根管治疗后牙修复中使用玻璃纤维桩的重要性。用玻璃纤维桩修复的根管治疗后的牙齿显示出更高的断裂强度和有利的断裂模式，因此强烈推荐使用，以获得更好的临床效果。
