The influence of antagonist standardization on wear
The influence of antagonist standardization on wear
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DOI：
10.1177/00220345990780021201
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发表时间：
1999-02-01
影响因子：
7.6
通讯作者：
Lutz, F
中科院分区：
文献类型：
--
作者：
Krejci, I;Albert, P;Lutz, F
为了易于检测材料之间的差异，体外磨损试验中的低变化是理想的。本文的工作假设是，根据材料对形状和大小进行标准化的拮抗剂将显示与天然非标准化瓣尖中发现的平均值相似的平均值，并且标准化将导致平均变异减少。首先，测量了未萌出上颌第三磨牙腭尖的形态和大小。用公式y = 0.001 x（2）最好地描述了尖瓣冲天炉，并且尖瓣冲天炉围绕旋转轴对称。最多200 μ m的y轴，这个抛物线对应最好的球半径为0.6毫米。基于这一信息，标准化的拮抗剂，从人的牙釉质和滑石制造。咬合接触区的磨损和相对的传统陶瓷和精细混合复合材料的磨损，分别在计算机化的咀嚼模拟器中进行量化。作为对照，使用天然人牙釉质牙尖。与非标准化釉质拮抗剂相比，标准化釉质牙尖并没有减少磨损的变化。此外，标准化导致拮抗剂和相反的修复材料中的显著不同的结果。因此，天然釉质拮抗剂优选用于模拟咬合接触区域中的磨损。
For differences among materials to be easily detected, low variation in in vitro wear tests is desirable. The working hypothesis of this paper was that antagonists standardized for shape and size and according to materials would show mean values similar to those found in natural, non-standardized cusps, and that standardization would lead to a reduction in mean variation. First, the shapes and sizes of palatal cusps of non-erupted human upper third molars were measured. The cusp cupola was best described by the formula y = 0.001 x(2) and was symmetrical around the axis of rotation. Up to 200 mu m of the y-axis, this parabola corresponded best to a ball radius of 0.6 mm. Based on this information, standardized antagonists were fabricated from both human enamel and steatite. Wear in the occlusal contact area and the wear of opposing conventional ceramic and fine hybrid composite, respectively, were quantified in a computerized chewing simulator. As a control, natural human enamel cusps were used. Standardization of enamel cusps did not reduce the variation of the resulting wear compared with that of non-standardized enamel antagonists. Furthermore, standardization led to significantly different results both in the antagonists and in the opposing restorative materials. Thus, natural enamel antagonists are preferable for the simulation of wear in the occlusal contact area.