Advanced Prosthodontics, Graduate School of Clinical Dentistry, Korea University, Seoul, Korea.
J Adv Prosthodont. 2010 Sep;2(3):111-5. doi: 10.4047/jap.2010.2.3.111. Epub 2010 Sep 30.
This study was conducted to evaluate clinical validity of a zirconia full-coverage crown by comparing zirconia's wear capacity over antagonistic teeth with that of feldspathic dental porcelain.
THE SUBJECT GROUPS WERE DIVIDED INTO THREE GROUPS: the polished feldspathic dental porcelain group (Group 1), the polished zirconia group (Group 2), and the polished zirconia with glazing group (Group 3). Twenty specimens were prepared from each group. Each procedure such as plasticity, condensation, and glazing was conducted according to the manufacturer's manual. A wear test was conducted with 240,000 chewing cycles using a dual-axis chewing simulator. The degree of wear of the antagonistic teeth was calculated by measuring the volume loss using a three-dimensional profiling system and ANSUR 3D software. The statistical significance of the measured degree of wear was tested with a significant level of 5% using one-way ANOVA and the Tukey test.
The degrees of wear of the antagonistic teeth were 0.119 ± 0.059 mm(3) in Group 1, 0.078 ± 0.063 mm(3) in Group 3, and 0.031 ± 0.033 mm(3) in Group 2. Statistical significance was found between Group 1 and Groups 2 and between Group 2 and 3, whereas no statistical significance was found between Group 1 and Group 3.
Despite the limitations of this study on the evaluation of antagonistic teeth wear, the degree of antagonistic tooth wear was less in zirconia than feldspathic dental porcelain, representing that the zirconia may be more beneficial in terms of antagonistic tooth wear.
本研究通过比较氧化锆全冠与长石质牙科瓷的对颌牙磨损能力，评估氧化锆全冠的临床有效性。
将受试组分为三组：抛光长石质牙科瓷组（第 1 组）、抛光氧化锆组（第 2 组）和上釉氧化锆组（第 3 组）。每组制备 20 个试件。按照制造商的说明书进行塑性、冷凝和上釉等操作。使用双轴咀嚼模拟器进行 240000 次咀嚼循环的磨损试验。使用三维轮廓系统和 ANSUR 3D 软件测量体积损失，计算对颌牙的磨损程度。使用单向方差分析和 Tukey 检验，以 5%的显著水平检验测量的磨损程度的统计学意义。
第 1 组对颌牙的磨损程度为 0.119 ± 0.059mm³，第 3 组为 0.078 ± 0.063mm³，第 2 组为 0.031 ± 0.033mm³。第 1 组与第 2 组和第 2 组与第 3 组之间存在统计学意义，而第 1 组与第 3 组之间无统计学意义。
尽管本研究在评价对颌牙磨损方面存在局限性，但氧化锆的对颌牙磨损程度小于长石质牙科瓷，表明氧化锆在对颌牙磨损方面可能更有益。
