可填充牙科复合材料的疲劳性能
Fatigue of packable dental composites.
作者信息
Papadogiannis Y, Lakes R S, Palaghias G, Helvatjoglu-Antoniades M, Papadogiannis D
机构信息
Aristotle University of Thessaloniki, School of Dentistry, Department of Operative Dentistry, Thessaloniki, Greece.
出版信息
Dent Mater. 2007 Feb;23(2):235-42. doi: 10.1016/j.dental.2006.01.015. Epub 2006 Feb 21.
OBJECTIVE
The purpose of the study was to measure the fatigue properties of four dental resin composites using a dynamic mechanical analysis and to relate the results with viscoelastic properties.
METHODS
Dynamic torsional loading was conducted at resonance at 30-50Hz. Specimens were thoroughly cured and tested dry at 21 degrees C.
RESULTS
All of the specimens showed a loss of strength following repeated stress, due to material fatigue. The material with the highest shear modulus had the lowest damping and the highest fatigue strength.
SIGNIFICANCE
Dental composites exhibit a modest loss of strength due to fatigue. Since mastication involves many cycles of stress during the life of a restoration, fatigue properties should be taken into account in restoration design.
目的
本研究的目的是使用动态力学分析来测量四种牙科树脂复合材料的疲劳性能，并将结果与粘弹性性能相关联。
方法
在30 - 50Hz的共振频率下进行动态扭转载荷。试样充分固化并在21摄氏度下干燥测试。
结果
由于材料疲劳，所有试样在反复应力作用下均表现出强度损失。剪切模量最高的材料阻尼最低，疲劳强度最高。
意义
牙科复合材料由于疲劳会出现一定程度的强度损失。由于咀嚼在修复体的使用寿命期间涉及许多应力循环，因此在修复体设计中应考虑疲劳性能。
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