Saiki Osamu, Koizumi Hiroyasu, Nogawa Hiroshi, Hiraba Haruto, Akazawa Nobutaka, Matsumura Hideo
Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry.
Dent Mater J. 2014;33(6):865-73. doi: 10.4012/dmj.2014-129.
The purpose of this study was to evaluate the influence of ceramic surface texture on the wear of rounded rod specimens. Plate specimens were fabricated from zirconia (ZrO2), feldspathic porcelain, and lithium disilicate glass ceramics (LDG ceramics). Plate surfaces were either ground or polished. Rounded rod specimens with a 2.0-mm-diameter were fabricated from type 4 gold alloy and heat-pressed ceramics (HP ceramics). Wear testing was performed by means of a wear testing apparatus under 5,000 reciprocal strokes of the rod specimen with 5.9 N vertical loading. The results were statistically analyzed with a non-parametric procedure. The gold alloy showed the maximal height loss (90.0 µm) when the rod specimen was abraded with ground porcelain, whereas the HP ceramics exhibited maximal height loss (49.8 µm) when the rod specimen was abraded with ground zirconia. There was a strong correlation between height loss of the rod and surface roughness of the underlying plates, for both the gold alloy and HP ceramics.
本研究的目的是评估陶瓷表面纹理对圆形杆状试件磨损的影响。平板试件由氧化锆（ZrO2）、长石质瓷和二硅酸锂玻璃陶瓷（LDG陶瓷）制成。平板表面进行了研磨或抛光处理。直径为2.0毫米的圆形杆状试件由4型金合金和热压陶瓷（HP陶瓷）制成。通过磨损试验装置在杆状试件垂直加载5.9 N的情况下进行5000次往复行程的磨损试验。结果采用非参数方法进行统计分析。当杆状试件与研磨过的瓷片摩擦时，金合金的高度损失最大（90.0 µm），而当杆状试件与研磨过的氧化锆摩擦时，HP陶瓷的高度损失最大（49.8 µm）。对于金合金和HP陶瓷，杆状试件的高度损失与下层平板的表面粗糙度之间存在很强的相关性。
