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首页> 外文期刊>The Journal of Prosthetic Dentistry >Development and application of a new abrasion testing device.
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Development and application of a new abrasion testing device.

机译：新型磨损测试设备的开发和应用。

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STATEMENT OF PROBLEM: Wear of gypsum materials is a significant problem in the fabrication of accurately fitting cast prosthetic devices. Unfortunately, there is little agreement on how to measure it. PURPOSE: This study was designed to evaluate the efficacy of a newly designed abrasion device and to develop a test methodology that provides a clinically relevant measure of material loss from gypsum material. MATERIAL AND METHODS: In this study, a unique benchtop microabrasion/microimpact device was created. The device consists of a vertical arm with a variably loaded stylus and a reciprocating table that moves the specimen under the stylus. Type IV gypsum samples (Silky Rock, Whip Mix Corp, Louisville, Ky.) were made with 1 mm vertical, 45-degree angled ridges used to represent crown margins. Samples (n = 30) were separated 1 hour after pouring and allowed to bench set for 24 hours or 7 days. Three loads (15, 50, and 75 g) were used, and the resulting defect was evaluated after 5, 10, 15, or 20 cycles of loading. Changes in mass and volume were recorded. RESULTS: At both 24 hours and 7 days, there was an increase in both mass and material volume loss with increasing load on the stylus (P<0.0001). There was no significant change in mass after 5 cycles of loading (P<0.05), but an increase in the volume loss occurred because of compaction of the walls of the defect (P<0.0001). CONCLUSION: Under these conditions, the increasing load had a greater effect than the number of load cycles on gypsum brittle fracture.
机译：问题陈述：石膏材料的磨损是精确装配铸造假体装置制造中的重要问题。不幸的是，关于如何衡量它几乎没有共识。目的：本研究旨在评估一种新设计的磨耗装置的功效，并开发一种测试方法，该方法可为石膏材料的材料损失提供临床相关的度量。材料与方法：在这项研究中，创建了一种独特的台式微磨蚀/微冲击装置。该设备包括一个带有可变负载测针的垂直臂和一个可将样品移动到测针下方的往复工作台。 IV型石膏样品（Silky Rock，Whip Mix Corp，路易斯维尔，肯塔基州）采用1 mm垂直，45度成角度的山脊制成，用于表示冠缘。样品（n = 30）在倒入后1小时分离，并放置24小时或7天。使用了三个负载（15、50和75 g），并在5、10、15或20个负载循环后评估了产生的缺陷。记录质量和体积的变化。结果：在24小时和7天，随着探针的负载增加，质量和材料体积损失均增加（P <0.0001）。加载5个循环后质量没有明显变化（P <0.05），但是由于缺陷壁的压实（P <0.0001），体积损失增加了。结论：在这些条件下，增加的荷载对石膏脆性断裂的影响大于荷载循环次数。

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