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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of an antirotation resistance form on screw loosening for single implant-supported crowns.
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Effect of an antirotation resistance form on screw loosening for single implant-supported crowns.

机译：抗旋转阻力形式对单个种植体支撑牙冠的螺钉松动的影响。

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STATEMENT OF PROBLEM: The gold screw of the single tooth implant-supported restoration has frequently been reported to exhibit the problem of screw loosening. PURPOSE: This in vitro study considered an antirotation resistance form with an increased moment arm length as a strategy to increase the net effect of the retaining screw preload. MATERIAL AND METHODS: Three groups examined included (a) standard abutments (3 mm), (b) modified standard abutments (3 mm) with 4 milled (1 x 1 mm) notches placed equidistant around the periphery, and (c) Estheticone abutments (1 mm). Crown castings of 2% gold-palladium-based alloy were made using plastic and resin patterns molded to fit inside a quarter-inch socket wrench. For testing, each specimen consisted of a 15-mm endosseous threaded implant analog, its abutment (20 N force) and crown casting (10 N force) screwed together and securely clamped in a vise. A clockwise shear (rotational) force was applied using a manual torque driver and the torque recorded to failure of the gold screw or loosening of the abutment screw. RESULTS: Analysis revealed that the dislodging force for groups (b) and (c) was similar (69.6 and 71.0 N.cm, respectively), whereas group (a) (standard implant external hex) demonstrated that the smallest moment arm required a significantly smaller dislodging force (21.3 N.cm). CONCLUSION: These findings suggest that the addition of an antirotation resistance form increased the length of the moment arm, thereby increasing the effect of preload and reducing the problem of screw loosening.
机译：问题陈述：单颗牙种植体支持的修复体的金螺丝经常被报道存在螺丝松动的问题。目的：这项体外研究认为抗扭力形式具有增加的力矩臂长度，作为增加固定螺钉预紧力净效果的策略。材料和方法：研究的三组包括（a）标准基台（3 mm），（b）改良的标准基台（3 mm）和在周边等距分布的4个铣削（1 x 1 mm）槽口，以及（c）雌二醇基台（1毫米）。 2％金-钯基合金的冠铸件是使用塑料和树脂模制而成的，模制为适合四分之一英寸的套筒扳手。为了进行测试，每个标本都由一个15毫米的骨内螺纹植入物类似物，其基台（20 N力）和牙冠铸件（10 N力）拧在一起并牢固地夹在虎钳中组成。使用手动扭矩驱动器施加顺时针方向的剪切（旋转）力，并记录扭矩，直到金螺丝失效或基台螺丝松动。结果：分析显示，组（b）和（c）的松脱力相似（分别为69.6和71.0 N.cm），而组（a）（标准种植体外六角）显示出最小的力矩臂需要较小的移动力（21.3 N.cm）。结论：这些发现表明，增加抗旋转阻力形式增加了力矩臂的长度，从而增加了预紧力的作用并减少了螺丝松动的问题。

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