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首页> 外文期刊>The Journal of Prosthetic Dentistry >Diametral tensile strength of a resin composite core with nonmetallic prefabricated posts: an in vitro study.
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Diametral tensile strength of a resin composite core with nonmetallic prefabricated posts: an in vitro study.

机译：具有非金属预制柱的树脂复合芯的径向拉伸强度：一项体外研究。

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STATEMENT OF PROBLEM: A number of prefabricated nonmetallic posts are currently available for use in conjunction with resin composite cores before fabrication of crowns for endodontically treated teeth. Information is needed regarding the strength of the composite and the nature of attachment between its components. PURPOSE: The aim of this study was to determine the influence of different types of posts on the fracture resistance of a resin composite core material using the diametral tensile strength (DTS) test. MATERIAL AND METHODS: Cylindrical specimens, 6 mm in diameter and 3 mm high, were prepared from resin composite (Tetric Ceram) and a group of prefabricated posts (n=10) as follows: resin composite only (control); Vectrispost (VTS); FiberKor (FKR); AEstheti-Plus post (ATP); Light-Post (LTP); Dentorama post (DRM), and Para-Post (PRP) as a second control. Specimens were stored for 7 days in water at 37 degrees C and then subjected to DTS test in a universal testing machine until failure occurred and load was recorded (N). Mean values and SD for DTS values (MPA) were calculated, and data were analyzed statistically with 1-way analysis of variance, followed by the Tukey test (alpha=.05). Representative specimens from each group were examined with SEM to determine nature of failure. RESULTS: Mean values (SD) in MPa for DTS were as follow: Control group: 49.64 (3.36); VTS: 29.77 (3.36); FKR: 31.9 (2.39); ATP: 28.92 (2.2); LTP: 34.26 (3.37); DRM: 33.45 (2.46), and PRP: 27.90 (2.40). Analysis of variance indicated significant differences among the groups (P<.05). SEM examination indicated that for PRP failure was adhesive in nature, whereas with all nonmetallic posts, cohesive failure was more predominant. CONCLUSION: The use of posts did not result in reinforcement of resin composite core when diametral tensile force was applied. When used with the core material, LTP, DRM, and FKR resulted in the highest DTS values, whereas PRP resulted in the lowest values.
机译：问题陈述：在制造牙髓治疗牙齿的牙冠之前，目前已有许多预制的非金属桩与树脂复合材料芯一起使用。需要有关复合材料强度及其组件之间附着性质的信息。目的：本研究的目的是使用直径拉伸强度（DTS）测试来确定不同类型的桩对树脂复合芯材抗断裂性的影响。材料与方法：用树脂复合材料（Tetric Ceram）和一组预制桩（n = 10）制备直径为6毫米，高为3毫米的圆柱形试样，方法如下： Vectrispost（VTS）; FiberKor（FKR）;审美+岗位（ATP）;轻邮（LTP）; Dentorama post（DRM）和Para-Post（PRP）作为第二个控件。将样品在37摄氏度的水中保存7天，然后在通用测试仪中进行DTS测试，直到发生故障并记录载荷（N）。计算DTS值（MPA）的平均值和SD，并使用方差的1向分析对数据进行统计分析，然后进行Tukey检验（alpha = .05）。用SEM检查每组的代表性样品，以确定破坏的性质。结果：DTS的平均值（SD）如下：对照组：49.64（3.36）; VTS：29.77（3.36）; FKR：31.9（2.39）; ATP：28.92（2.2）; LTP：34.26（3.37）; DRM：33.45（2.46），PRP：27.90（2.40）。方差分析表明各组之间存在显着差异（P <.05）。 SEM检查表明，PRP失效本质上是粘附性的，而在所有非金属桩中，内聚性失效更为主要。结论：在施加径向张力时，使用柱子不会增强树脂复合材料芯。与芯材一起使用时，LTP，DRM和FKR导致DTS值最高，而PRP导致最低值。

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