Cyclic fatigue testing of denture teeth for bulk fracture.
Cyclic fatigue testing of denture teeth for bulk fracture.
复制标题
义齿牙齿整体断裂的循环疲劳测试。
DOI：
10.1016/j.dental.2013.07.001
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发表时间：
2013
期刊：
影响因子：
5
通讯作者：
J. Kelly
中科院分区：
文献类型：
--
作者：
P. Kappert;J. Kelly
摘要目的种植义齿的临床经验显示，牙齿的折断和崩碎是一个问题。在一所大学，每年约有2.5%的牙齿断裂和碎裂率。目前还没有标准化的测试开发的整体断裂或碎裂的假牙。这样的测试将有助于改善牙齿的发展，并在其evaluation.MethodsCentral切牙牙齿嵌入在丙烯酸和加载在切缘90°，他们的长轴。测试的牙齿包括市售的牙齿和两套由改进的材料制成的牙齿，这些材料旨在增加韧性。在5 Hz下进行20 N至135 N、150 N、175 N和200 N的循环载荷。使用寿命分析软件在每个加速载荷下拟合分析数据，然后外推至临床使用载荷（阿尔塔7，Reliasoft Corp.）临床使用负荷来自外推的失败概率（Pf）的数据为2.5%Pf.ResultsWhen仔细嵌入，牙齿可以重复加载失败的散装骨折，涉及类似的失败模式，临床上看到的。计算的临床使用载荷在70 N范围内。从加速加载的结果可以适合类似的概率，允许外推到临床使用load.SignificanceThis工作的失败分布是能够开发一个临床有效的散装断裂测试的疲劳失效的门牙义齿。看来，用改进的材料制造的牙齿将有望在临床上表现得更好。因此，两个零假设均被拒绝。
ObjectivesClinical experience with implant-supported dentures indicates that fracture and chipping of teeth are becoming an issue. Tooth fracture and chipping rates of approximately 2.5% per year are being experienced at one university. There has been no standardized test developed for bulk fracture or chipping of denture teeth. Such a test would aid in the development of improved teeth and in their evaluation.MethodsCentral incisor teeth were embedded in acrylic and loaded on incisal edges at 90° to their long axes. Teeth tested included ones commercially available and two sets made from improved materials designed to increase toughness. Cyclic loading was done at 5 Hz from 20 N to 135 N, 150 N, 175 N and 200 N. Data was analyzed using lifetime analysis software fit at each of the accelerated loads and then extrapolated to clinical use loads (Alta 7, Reliasoft Corp.) Clinical use loads were derived from extrapolation of probability of failure (Pf) data to 2.5% Pf.ResultsWhen carefully embedded, teeth could be reproducibly loaded to failure by bulk fracture involving a failure mode similar to that seen clinically. Clinical use loads were calculated to be in the range of 70 N. Results from accelerated loading could be fit to similar probability of failure distributions allowing extrapolation to clinical use loads.SignificanceThis work was able to develop a clinically valid bulk fracture test for the fatigue failure of incisor denture teeth. It appears that teeth fabricated with improved materials will be expected to perform better clinically. Thus both the null hypotheses were rejected.