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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of clasp retention on enamel and composite resin-recontoured abutments following repeated removal in vitro.
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Comparison of clasp retention on enamel and composite resin-recontoured abutments following repeated removal in vitro.

机译：在体外反复移除后，牙釉质和复合树脂轮廓基台上的扣环保持力比较。

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STATEMENT OF PROBLEM: Loss of prosthetic retention over time is a concern with removable prostheses. Use of composite resin to modify an abutment contour receiving a removable partial denture clasp may offer a reasonable, less invasive method of improving removable prosthesis retention. PURPOSE: The purpose of this study was to evaluate the removal force of clasps over composite resin-recontoured abutments during a simulated 4 years of service. MATERIAL AND METHODS: Twenty first mandibular premolars were selected to form 2 groups of specimens (n=5) resembling a tooth-supported edentulous space. A packable composite resin (Filtek P60) was used to create a 0.25-mm undercut on the buccal abutment surfaces of the composite resin group. Teeth in the natural abutment group were mounted in angulation to produce 0.25-mm undercuts on the buccal surfaces. The chrome-cobalt framework consisted of 2 individually fabricated T-clasps. Both groups were subjected to 4500 cycles of repeated removal using a small shaker. Removal forces were recorded before the repeated removal test (T(0)), after 500 and 1000 cycles, and at 1000-cycle intervals thereafter. The mean values of forces between the 2 groups were compared at each stage using the Mann-Whitney test (alpha=.05). RESULTS: No debonding occurred during the test. At T(0), the highest and lowest force values were observed in the composite resin group (3.75 N and 17.5 N, respectively). There was a significant difference between the removal forces of the 2 groups after 500 cycles and at test completion (P=.008). Retention loss was 3 times greater in the composite resin group than in the natural abutments group (53.65% vs. 15.80%). CONCLUSIONS: Within the limitations of the study, removal forces of the composite resin-recontoured abutments were threefold less than those of natural abutments after 4 years of simulated service.
机译：问题陈述：随着时间的流逝，假体保留的丧失是可拆卸假体的一个问题。使用复合树脂来修改接收可摘局部义齿扣的基台轮廓可以提供一种合理的，侵入性较小的方法来改善可摘假体的固位。目的：本研究的目的是评估在模拟的4年服役期间，扣环在复合树脂轮廓基台上的去除力。材料与方法：选择20个第一下颌前磨牙，形成2组标本（n = 5），类似牙齿支撑的无牙间隙。使用可填充的复合树脂（Filtek P60）在复合树脂组的颊基台表面上形成0.25 mm的底切。天然基台组中的牙齿成角度安装，在颊面产生0.25 mm的底切。铬钴框架由2个单独制造的T型搭扣组成。两组均使用小型振荡器进行4500次重复去除操作。在重复去除试验（T（0））之前，500和1000次循环之后以及之后以1000次循环的间隔记录去除力。使用Mann-Whitney检验（α= .05）在每个阶段比较两组之间的力平均值。结果：在测试过程中没有发生剥离。在T（0）时，在复合树脂组中观察到最高和最低的力值（分别为3.75 N和17.5 N）。在500个循环后和测试完成时，两组的去除力之间存在显着差异（P = .008）。复合树脂组的保持力损失是天然基台组的3倍（53.65％对15.80％）。结论：在研究范围内，经过4年的模拟使用，复合树脂轮廓基台的去除力比天然基台低三倍。

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