纤维增强型复合根管桩三点弯曲试验。

Department of Dental Prosthetics, Wroclaw Medical University, Poland.

Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Poland.

Adv Clin Exp Med. 2020 Sep;29(9):1111-1116. doi: 10.17219/acem/125426.

BACKGROUND

The primary reason for using a post is to retain the core with the objective to restore the missing coronal tooth structure. To achieve optimum results, the materials that are used to restore endodontically treated teeth should have physical and mechanical properties that are similar to that of dentin.

OBJECTIVES

To characterize the strength parameters of fiber-reinforced composite (FRC) posts with the application of a three-point test. The mean fracture load, flexural strength and flexural modulus were taken into consideration.

MATERIAL AND METHODS

For the three-point strength tests, 5 kinds of fiberglass root-posts were used: GC Fiber Post (GC America, Alsip, USA), Mirafit White (Hager Werken, Duisburg, Germany), Innopost (InnoTech, Verona, Italy), Rebilda Post (Voco, Cuxhaven, Germany), and EverStick Post (GC Europe, Leuven, Belgium). For each system, 15 FRC posts were tested. All posts had the same diameter, length and shape. The three-point test was carried out in accordance with ISO 10477:2004, using the Instron-5944 testing machine (Instron, Norwood, USA). The test was carried out until the sample was broken.

RESULTS

The highest force values (67.6 N) were recorded for the GC posts, and the lowest force required to break the sample (29.6 N) was noted for the EverStick Posts. In the case of bending strength, the highest values were also recorded for GC posts (912.4 MPa). Low bending strengths were obtained for the Mirafit White posts (537.2 MPa); however, the EverStick Posts were the weakest (436.2 MPa). Rebilda posts showed the highest modulus of elasticity - 31.1 GPa. The lowest values of the elastic modulus were registered for EverStick Posts - 12.5 GPa.

CONCLUSIONS

There were statistically significant differences in fracture loads, flexural strengths and flexural modulus of the FRC-post systems tested. Individually polymerized FRC material showed lower flexural properties than compared prefabricated FRC posts.

背景

使用桩的主要原因是保留核心，目的是恢复缺失的牙冠结构。为了达到最佳效果，用于修复牙髓治疗过的牙齿的材料应具有与牙本质相似的物理和机械性能。

目的

用三点测试来描述纤维增强复合材料（FRC）桩的强度参数。考虑了平均断裂载荷、弯曲强度和弯曲模量。

材料和方法

对于三点强度测试，使用了 5 种玻璃纤维根管桩：GC 纤维桩（GC America，Alsip，USA）、Mirafit White（Hager Werken，Duisburg，Germany）、Innopost（InnoTech，Verona，Italy）、Rebilda Post（Voco，Cuxhaven，Germany）和 EverStick Post（GC Europe，Leuven，Belgium）。对于每个系统，测试了 15 个 FRC 桩。所有的桩都有相同的直径、长度和形状。三点测试按照 ISO 10477:2004 进行，使用 Instron-5944 试验机（Instron，Norwood，USA）。测试进行到样品断裂为止。

结果

GC 桩记录的最大力值（67.6 N），EverStick 桩记录的最小断裂力值（29.6 N）。在弯曲强度方面，GC 桩也记录了最高值（912.4 MPa）。Mirafit White 桩的弯曲强度较低（537.2 MPa）；然而，EverStick 桩是最弱的（436.2 MPa）。Rebilda 桩显示出最高的弹性模量-31.1 GPa。EverStick 桩的弹性模量最低值为 12.5 GPa。