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首页> 外文期刊>The Journal of Prosthetic Dentistry >In vitro evaluation of the fracture resistance of anterior endodontically treated teeth restored with glass fiber and zircon posts.
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In vitro evaluation of the fracture resistance of anterior endodontically treated teeth restored with glass fiber and zircon posts.

机译：玻璃纤维和锆石桩修复的前牙髓治疗牙齿的抗断裂性的体外评估。

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STATEMENT OF PROBLEM: The published information is equivocal regarding the fracture resistance of endodontically treated teeth restored with fiber posts. Additionally, little is known about the biomechanical performance of glass fiber and zircon posts. PURPOSE: This in vitro study investigated the fracture resistance of anterior endodontically treated teeth prepared with a 2-mm ferrule, restored with glass fiber and zircon posts and composite resin cores or cast posts and cores. MATERIAL AND METHODS: Twelve matched pairs of teeth were obtained from 4 cadavers, and all were endodontically treated and prepared with a standardized 2-mm ferrule. According to a random number table, the 2 teeth from each matched pair were randomly divided into 2 groups. The test group consisted of 12 specimens restored with a glass fiber and zircon post (Fibio) and composite resin (Durafil) core. Twelve matching specimens restored with a nickel-chromium (NiCr) cast post and core served as the control. Specimens in both groups were cemented with resin cement (Panavia F). After cementation of cast NiCr complete crowns with zinc polycarboxylate cement (ShangChi), the specimens were loaded with an incremental static force at an angle of 135 degrees to the long axis of the root until failure occurred. A paired sample t test was used to compare the fracture resistance (N) of teeth restored with the 2 post-and-core systems (alpha=.05). RESULTS: The mean failure load of paired differences between the 2 groups was -261.3+/-237.3 N. The test group exhibited significantly lower failure loads than the control group (P=.004). All specimens displayed root fractures, most of which were oblique, with cracks initiating from the palatal cervical margin and propagating in a labial-apical direction. CONCLUSION: Within the limitations of this study, the teeth restored with glass fiber and zircon posts demonstrated significantly lower failure loads than those with cast NiCr post and cores. All specimens failed via root fractures.
机译：问题陈述：关于采用纤维桩修复的经牙髓治疗的牙齿的抗断裂性，所发表的信息含糊不清。另外，对于玻璃纤维和锆石柱的生物力学性能知之甚少。目的：这项体外研究调查了用2毫米套圈制备的经牙髓治疗的前牙的抗断裂性，并用玻璃纤维和锆石桩以及复合树脂芯或铸造桩芯进行了修复。材料与方法：从4具尸体中获得十二对匹配的牙齿，并对所有牙齿进行牙髓治疗，并用标准的2毫米插芯制备。根据随机数表，将每对匹配的2颗牙齿随机分为2组。测试组由12个标本组成，这些标本用玻璃纤维和锆石桩（Fibio）和复合树脂（Durafil）芯修复。以镍铬（NiCr）铸造柱和芯修复的十二个匹配标本作为对照。两组标本均用树脂水泥（Panavia F）粘接。用多羧酸锌水泥（ShangChi）将铸造的NiCr完整牙冠固结后，向试样施加与根部长轴成135度角的增量静态力，直到发生破坏。配对样本t检验用于比较使用2个桩核系统（α= .05）修复的牙齿的抗断裂强度（N）。结果：两组之间成对差异的平均失效负荷为-261.3 +/- 237.3N。测试组的失效负荷明显低于对照组（P = .004）。所有标本都显示出根部骨折，其中大多数是倾斜的，裂纹从from上颈缘开始并向唇顶方向扩展。结论：在这项研究的局限性内，玻璃纤维和锆石桩修复的牙齿的破坏载荷明显低于铸造镍铬桩和核的牙齿。所有标本均因根部断裂而破裂。

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