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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of washers on reverse torque displacement of dental implant gold retaining screws.
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Effect of washers on reverse torque displacement of dental implant gold retaining screws.

机译：垫圈对牙种植体金固定螺钉反向扭矩位移的影响。

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摘要

STATEMENT OF THE PROBLEM: Gold screw loosening is a frequent problem that affects dental implants. PURPOSE: This study determined the effect of spring washers on gold screw displacements during applied removal torque in dental implants. MATERIAL AND METHODS: A 3-unit fixed partial denture was cast in semiprecious alloy and fixed to 2 dental implants with gold-retaining screws. Implants were embedded in acrylic resin and restrained from movement. A miniature load sensor was attached to a torque controller handpiece to accurately measure the time and torque needed to completely loosen the gold screws. Rotational displacements were calculated for 4 experimental setups, involving washers placed on (a) both, (b) the mesial, (c) the distal, and (d) no implants. Screw displacement data were compared between implants in all 4 combinations by means of paired t tests. RESULTS: Gold screws with underlying conical spring washers underwent on average up to 35% (14.1 microm) more rotational displacement during applied removal torque than those without washers. CONCLUSION: Inclusion of a conical spring washer significantly increased the amount of rotational displacement needed to completely loosen an implant gold retaining screw.
机译：问题陈述：松金螺钉是一个经常发生的问题，会影响牙种植体。目的：这项研究确定了弹簧垫圈对牙种植体施加的去除扭矩期间金螺钉位移的影响。材料与方法：将3个单位的局部义齿铸造在半贵重合金中，并用固金螺钉将其固定在2个种植牙上。将植入物嵌入丙烯酸树脂中，并限制其移动。微型负载传感器连接到扭矩控制器机头上，以准确测量完全松开金螺丝所需的时间和扭矩。计算了4种实验装置的旋转位移，其中包括将垫圈放置在（a）两侧，（b）内侧，（c）远端和（d）没有植入物上）。通过配对t检验比较了所有4种组合中种植体之间的螺钉位移数据。结果：与未使用垫圈的金螺钉相比，带有下方锥形弹簧垫圈的金螺钉在施加的去除扭矩期间平均要多旋转35％（14.1微米）。结论：包含锥形弹簧垫圈大大增加了完全松开植入物金固定螺钉所需的旋转位移量。

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