Ramp M H, Ramp L C, Suzuki S
University of Alabama at Birmingham School of Dentistry 35294-0007, USA.
J Prosthodont. 1999 Dec;8(4):252-7. doi: 10.1111/j.1532-849x.1999.tb00047.x.
The objective of this in vitro investigation was to compare the vertical wear produced by cone-shaped styli of three ceramic restorative materials and a Type III gold alloy opposing flattened human enamel. Vertical wear was measured as enamel height loss, material stylus height loss, and total vertical height loss (the sum of the enamel height loss and the restorative material height loss).
Ten cone-shaped styli were fabricated from each of four restorative materials, which included two machined ceramics, a pressed ceramic, and a Type III gold alloy. To maintain the standardized shape, styli were not polished or glazed. Specimens were subjected to wear in the presence of water for 100,000 cycles at 1.2 Hz under a load of 75 N using a wear simulation device. Enamel wear was evaluated by profilometry, and stylus wear was evaluated by computer imaging. Vertical wear was reported as enamel height loss, material stylus height loss, and total vertical height loss (the sum of the enamel height loss and material height loss). Data were compared using one-way analysis of variance and Scheffe's analysis (alpha = 0.05).
Significant differences existed among materials based on material height loss (p = .0001), enamel height loss (p = .0001), and total vertical height loss (p = .0118). No significant difference among the three ceramics was found in mean total height loss, which ranged from 0.280 to 0.305 mm. However, the Type III gold exhibited less mean total wear (0.231 +/- 0.082) than the pressed and one machineable ceramic. This machined ceramic exhibited the most material height loss (0.249 +/- 0.044 mm). With the other ceramics, mean enamel wear was significantly more (0.211 and 0.216 mm, respectively).
During wear simulation, pressed or machineable ceramics opposing flattened enamel exhibited a similar degree of total vertical height loss. One machined ceramic material wore significantly more than the other materials. The other machineable ceramic and the pressed ceramic wore the opposing enamel significantly more.
本体外研究的目的是比较三种陶瓷修复材料的锥形探针与扁平的人类牙釉质相对时产生的垂直磨损情况。垂直磨损通过牙釉质高度损失、材料探针高度损失以及总垂直高度损失（牙釉质高度损失与修复材料高度损失之和）来衡量。
用四种修复材料各制作10个锥形探针，其中包括两种加工陶瓷、一种压制陶瓷和一种Ⅲ型金合金。为保持标准化形状，探针未进行抛光或上釉处理。使用磨损模拟装置，在75N的载荷下，于1.2Hz频率下在有水的环境中对样本进行100,000次循环的磨损试验。通过轮廓仪评估牙釉质磨损，通过计算机成像评估探针磨损。垂直磨损以牙釉质高度损失、材料探针高度损失以及总垂直高度损失（牙釉质高度损失与材料高度损失之和）来报告。使用单因素方差分析和谢费分析（α = 0.05）对数据进行比较。
基于材料高度损失（p = 0.0001）、牙釉质高度损失（p = 0.0001）和总垂直高度损失（p = 0.0118），材料之间存在显著差异。三种陶瓷的平均总高度损失范围为0.280至0.305mm，未发现显著差异。然而，Ⅲ型金合金的平均总磨损量（0.231±0.
