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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Misfit on Preload Maintenance of Retention Screws of Implant-Supported Prostheses
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Effect of Misfit on Preload Maintenance of Retention Screws of Implant-Supported Prostheses

机译：错配对植入物支撑假体的固定螺钉预压维护的影响

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摘要

The aim of this study was to evaluate the effect of unilateral misfit at different levels on a crown-implant-retention screw system of implant-supported crowns. Hexagon castable UCLA abutments were cast in Co-Cr alloy to fabricate 48 metallic crowns divided into four groups (n = 12). Group A: crowns did not present misfit; Groups B, C and D: crowns were fabricated with unilateral misfit of 50, 100, and 200 μm, respectively. The crowns were attached by titanium retention screw with 30 N/cm to external hexagonal osseointegrated implants embedded in acrylic resin. After 2 min, the retention screw of each replica was submitted to detorque evaluation by an analogic torque gauge. Three retention screws were used to perform detorque evaluation at each replica and the procedure was repeated twice with each screw. Each group was submitted to 72 detorque measurements. Data were evaluated by ANOVA and Tukey test (P < 0.05). All groups exhibited significant decrease (P < 0.05) in preload and the lowest decrease occurred in Group A. Groups B, C, and D were statistically significant different from Group A (P < 0.05), but there was no statistically significant difference between Groups B and D (P > 0.05). Crowns with unilateral misfit presented higher preload decrease than crowns completely fitted to osseointegrated implants.
机译：这项研究的目的是评估不同水平的单侧错配对种植体支撑牙冠的种植体固位螺钉系统的影响。将六角形可浇铸的UCLA基台浇铸在Co-Cr合金中，以制造分为四个组（n = 12）的48个金属冠。 A组：牙冠未出现不适; B，C和D组：分别以50、100和200μm的单边失配制造牙冠。通过钛固位螺钉以30 N / cm的速度将牙冠固定在嵌入丙烯酸树脂的外部六角形骨结合植入物中。 2分钟后，通过类似的扭矩计对每个复制品的固定螺钉进行扭矩评估。使用三个固定螺钉对每个复制品进行扭矩评估，并对每个螺钉重复该过程两次。每组进行72次扭矩测量。数据通过方差分析和Tukey检验进行评估（P <0.05）。所有组的预紧力均显着下降（P <0.05），而最低的下降发生在A组。B，C和D组与A组有统计学差异（P <0.05），但各组之间无统计学差异B和D（P> 0.05）。单侧错配的牙冠比完全固定在骨整合种植体上的牙冠具有更高的预紧力降低。

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