al-Hiyasat A S, Saunders W P, Smith G M
Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
J Prosthet Dent. 1999 Oct;82(4):476-81. doi: 10.1016/s0022-3913(99)70037-5.
Wear of human enamel is a clinical concern whenever opposing teeth need to be restored using ceramic restorations.
This in vitro study investigated wear of human enamel and 3 dental ceramics: a conventional porcelain (Vitadur Alpha), a low-fusing hydrothermal ceramic (Duceram-LFC), and a machinable ceramic (Vita Mark II) in a 3-body wear test.
Thirty pairs of tooth-ceramic specimens were tested in a dental wear machine, under a standard load (40 N), rate (80 cycles/minute), and for 25,000 cycles in a simulated food slurry medium. Amount of wear was determined by measuring the height loss of the tooth and depth of wear track of the ceramic materials. Analysis of variance (ANOVA) was used to analyze the data, followed by Bonferroni multiple comparisons method to produce sets of simultaneous 95% confidence intervals.
ANOVA revealed significant differences between the groups for both enamel wear (P =. 002) and ceramic wear (P <.001). Further comparisons (95% CI significance level) revealed that the difference in enamel wear produced by Alpha porcelain and Duceram-LFC ceramic material was not statistically significant, whereas that produced by Vita Mark II ceramic was significantly less. Vita Mark II ceramic was significantly more resistant to wear than Alpha porcelain and Duceram-LFC ceramic. Furthermore, Alpha porcelain was significantly more resistant to wear than Duceram-LFC ceramic.
The abrasiveness of Alpha porcelain and Duceram-LFC ceramic was similar, yet both were significantly more abrasive than Vita Mark II ceramic. In addition, Vita Mark II was the most wear-resistant ceramic and Duceram-LFC ceramic the least resistant.
每当需要使用陶瓷修复体修复对颌牙时，人类牙釉质的磨损就是一个临床关注的问题。
本体外研究在三体磨损试验中研究了人类牙釉质和三种牙科陶瓷材料的磨损情况：一种传统瓷器（维他多聚 Alpha）、一种低熔水热陶瓷（Duceram-LFC）和一种可加工陶瓷（维他马克 II）。
三十对牙齿 - 陶瓷标本在牙科磨损试验机中进行测试，在标准载荷（40 N）、速率（80 次循环/分钟）下，在模拟食物浆液介质中进行 25000 次循环。通过测量牙齿的高度损失和陶瓷材料磨损轨迹的深度来确定磨损量。采用方差分析（ANOVA）分析数据，随后采用 Bonferroni 多重比较法生成同时的 95%置信区间集。
方差分析显示，在牙釉质磨损（P = 0.002）和陶瓷磨损（P < 0.001）方面，各组之间存在显著差异。进一步比较（95%CI 显著性水平）显示，Alpha 瓷器和 Duceram-LFC 陶瓷材料产生的牙釉质磨损差异无统计学意义，而维他马克 II 陶瓷产生的牙釉质磨损显著较少。维他马克 II 陶瓷比 Alpha 瓷器和 Duceram-LFC 陶瓷更耐磨。此外，Alpha 瓷器比 Duceram-LFC 陶瓷更耐磨。
Alpha 瓷器和 Duceram-LFC 陶瓷的磨蚀性相似，但两者的磨蚀性均显著高于维他马克 II 陶瓷。此外，维他马克 II 是最耐磨的陶瓷，而 Duceram-LFC 陶瓷最不耐磨。
