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首页> 外文期刊>The Journal of Prosthetic Dentistry >Fracture resistance of soft tissue level implants after cyclic loading and external modification
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Fracture resistance of soft tissue level implants after cyclic loading and external modification

机译：循环加载和外部修饰后软组织水平植入物的抗断裂性

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Statement of problem: The exposure of the implant collar in the esthetic zone is a challenging complication of implant dentistry. The preparation of the exposed implant collar to create room for restorative material may decrease the strength of the abutment/implant assembly. Purpose: The purpose of this in vitro study was to evaluate the effect on the failure load of preparing a 0.5-mm chamfer finish line on an implant collar at various apical depths. Material and methods: Thirty solid abutments and 30 implants were screwed into a customized metal mold at a 30-degree angle to the vertical axis. An intact group (IN) (control) (n=10) had no preparation, experimental group P1 had a 0.5-mm chamfer margin placed 1 mm apical to the implant/abutment interface, and experimental group P2 had the margin placed 2 mm apical. The specimens were subjected to a fatigue loading of 200 N for 1 000 000 cycles. Unfractured specimens were then loaded until failure. Mean fracture load (MFL) values were compared with 1-way ANOVA, and the Tukey test was used to identify differences among groups (α=.05). Results: One specimen from both the IN and P1 groups and 2 specimens from the P2 group failed after fatigue loading. Significant differences in the MFL values were found between the IN group (3825) and P1 group (2944), P<.001 and between the IN group and the P2 group (2553), P<.001. Conclusions: The mean load required to fracture the abutment/implant assembly decreased significantly after various amounts of implant collar preparation.
机译：问题陈述：植入物环在美学区域的暴露是植入物牙科的具有挑战性的并发症。准备裸露的种植体环以为修复材料创造空间可能会降低基台/种植体组件的强度。目的：这项体外研究的目的是评估在各种根尖深度下在种植体环上准备0.5 mm倒角精加工线对失效载荷的影响。材料和方法：将30个固体基台和30个植入物以与垂直轴成30度角的方式旋入定制的金属模具中。完整组（IN）（对照组）（n = 10）没有准备，实验组P1的0.5mm倒角边缘位于种植体/基台界面的顶端1 mm，实验组P2的边缘向2mm的顶端倾斜。样品承受200 N的疲劳载荷，持续1 000 000次循环。然后加载未断裂的样品直至失效。将平均骨折负荷（MFL）值与1向ANOVA进行比较，并使用Tukey检验确定组之间的差异（α= .05）。结果：疲劳负荷后，IN和P1组的1个标本和P2组的2个标本失效。在IN组（3825）和P1组（2944）之间发现MFL值有显着差异，P <.001，而IN组和P2组之间（2553），P <.001。结论：在准备各种量的种植体项圈后，使基台/种植体组件断裂所需的平均负荷显着降低。

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