Influence of convergence angle and cement space on adaptation of zirconium dioxide ceramic copings
Influence of convergence angle and cement space on adaptation of zirconium dioxide ceramic copings
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DOI：
10.1080/00016350802139833
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发表时间：
2008-01-01
影响因子：
2
通讯作者：
Matsumura, Hideo
中科院分区：
文献类型：
--
作者：
Iwai, Takayuki;Komine, Futoshi;Matsumura, Hideo
Objective.本研究的目的是评价总会聚角和骨水泥间隙对后牙氧化锆陶瓷冠的内部和边缘适应性的影响。材料和方法。72个标准化的下颌第一磨牙氧化锆帽制作与9个参数：三个不同的总会聚角（6度，12度，20度）与三个不同的计算机固定的水泥空间（10，30，60 μ m）。边缘适应性通过直接观察来测量内冠和基台之间的垂直差异。使用激光显微镜使用骨水泥复制技术评估内部适应性。进行Kruskal-Wallis检验和Wilcoxon秩和检验，以检验内部空间和边缘差异值的差异（=0.05）。结果平均内部空间/边缘差异的中位数范围为54.0/27.4至128.1/77.8 μ m。无论骨水泥间隙如何，在6 °和20 °会聚角组之间，发现内部间隙存在统计学显著差异。不同骨水泥间距对12 °和20 °会聚角组无显著影响。在所有不同会聚角中，60 μ m骨水泥间隙组的边缘差异在统计学上小于10 μ m骨水泥间隙组。结论.在本研究的范围内，氧化锆陶瓷冠的内部空间可能会随着基牙聚合角的增加而减少。计算机固定的粘固剂间隙可能会影响氧化锆陶瓷冠的边缘适合性。所得氧化锆陶瓷冠的内部和边缘适合性在临床可接受的范围内。
Objective. The purpose of the present study was to evaluate the influence of total convergence angle and cement space on internal and marginal adaptation of posterior zirconium dioxide (zirconia) ceramic copings. Material and methods. Seventy-two standardized mandibular first molar zirconia copings were fabricated with nine parameters: three different total convergence angles (6 degrees, 12 degrees, and 20 degrees) with three different computer-fixed cement spaces (10, 30, and 60 mu m). Marginal adaptation was assessed to measure vertical discrepancy between the coping and abutment by direct viewing. Internal adaptation was evaluated using the cement replica technique with a laser microscope. The Kruskal-Wallis test and Wilcoxon rank-sum test were performed to test for differences in internal space and marginal discrepancy values (=0.05). Results. The median of mean internal spaces/marginal discrepancies ranged from 54.0/27.4 to 128.1/77.8 mu m. Statistically significant differences in the internal spaces were found between groups with 6 degrees and 20 degrees convergence angle, regardless of cement space. The different cement spaces did not have any significant influence on the 12 degrees and 20 degrees convergence angle groups. The 60-mu m cement space group exhibited statistically smaller marginal discrepancies than the 10-mu m cement space group in all the different convergence angles. Conclusions. Within the limitations of the present study, the internal spaces of zirconia ceramic copings may decrease as the convergence angles of abutments increase. The computer-fixed cement space might influence the marginal adaptation of zirconia ceramic copings. The internal and marginal adaptation of zirconia ceramic copings obtained was within the range of clinical acceptance.