Effect of friction coefficient on Akers clasp retention
Effect of friction coefficient on Akers clasp retention
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DOI：
10.1016/s0022-3913(97)70083-0
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发表时间：
1997-07-01
影响因子：
4.6
通讯作者：
Akagawa, Y
中科院分区：
文献类型：
--
作者：
Sato, Y;Abe, Y;Akagawa, Y
问题陈述。卡环固位体的固位闹剧控制是可摘局部义齿功能成功的关键因素之一。然而，目前还不清楚修复基台和卡环材料之间的摩擦系数有何不同，以及摩擦系数如何影响卡环的固位。本研究的目的是厘清修复基台与卡环材料间的摩擦系数，并评估摩擦系数对卡环固位的影响。材料和方法。研究了两种表面处理（抛光和喷砂）的三种卡环材料（IV型金、高Pd和钴铬合金）与四种基台材料（人牙釉质、陶瓷、IV型金和高Pd合金）在干、湿、湿唾液三种条件下的静摩擦系数，并从理论上估计了摩擦系数对卡环固位的影响。不同工况下的摩擦系数从0.08（干燥工况下IV型基台抛光Co-Cr卡环）到0.37（干燥工况下喷砂Co-Cr卡环）不等。理论估计表明，卡环的固位力与摩擦系数成线性关系。根据新建立的公式，固位力随基台材料与搭扣材料间摩擦系数的增加而线性增加。本研究建议应根据基台材料的不同而改变搭扣的设计。
Statement of problem. Retentive farce control of clasp retainers is one of the most essential factors for the successful function of removable partial dentures. However, it is not yet known how the friction coefficients differ among restored abutments and clasp materials, and how the friction coefficients affect the retention of clasps.Purpose. The purposes of this study were to clarify the friction coefficients among restored abutments and clasp materials and to estimate the effect of friction coefficients on the retention of clasps.Material and methods. The coefficients of static friction between three clasp materials (type IV gold, high Pd, and cobalt-chromium [Co-Cr] alloys) of two surface treatments (polished and sandblasted) and four abutment materials (human enamel, porcelain, type IV gold, and high Pd alloys) were evaluated under three conditions (dry, wet with water, and wet with saliva, and theoretically, the effect of the friction coefficients on clasp retention nas estimated.Results. The friction coefficients under various conditions ranged from 0.08 (polished Co-Cr clasp on type IV abutment in dr) condition) to 0.37 (sandblasted Co-Cr clasp on high Pit abutment in dry condition). The theoretical estimation clarified that the retentive force of the clasp was linear to the friction coefficient.Conclusion. The retentive force increased linearly with increasing friction coefficient between abutment material and clasp material according to the newly developed formula. This study suggested that clasp designs should be changed depending on abutment materials.