Graduate student, Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
Associate Professor, Department of Statistics, Kyungpook National University, Daegu, Republic of Korea.
J Prosthet Dent. 2018 Apr;119(4):600-605. doi: 10.1016/j.prosdent.2017.05.022. Epub 2017 Aug 4.
Various methods for measuring prosthesis misfit have been suggested. Although the cross-sectional images between the crown and abutment are used to evaluate the misfit, the effects of the image and the observer's knowledge on the precision of measurement are unknown.
The purpose of this in vitro study was to investigate the effects of the image and of education on the precision of prosthesis misfit measurement methods using inter- and intraobserver variability analyses.
The cross-sectional images in the margin were obtained using the computer-aided replica technique (CART), silicone replica technique (RT), and sectioning technique (ST). Twenty-five observers measured the absolute marginal discrepancy values in the images obtained from each group 4 times at an interval of 2 weeks; the observers went through different education sessions regarding the selection of the measurement points. The precision of measurement was determined and compared using the likelihood-ratio test statistic (α=.05) and the intraclass correlation coefficient with the linear mixed-effects model.
The CART group exhibited the smallest deviations in the measurement variations, followed by the ST and RT groups (P<.001). Additional education on misfit measurements generally decreased the deviation values in all the groups, but without any significant differences.
The cross-sectional image obtained from the measurement methods and education on the evaluation method affected the precision of the prosthesis misfit measurement. Digital methods might be a useful tool to significantly enhance the precision of the measurements.
已经提出了各种测量修复体不匹配的方法。虽然使用冠和基台之间的横截面图像来评估不匹配，但图像和观察者的知识对测量精度的影响尚不清楚。
本体外研究的目的是通过分析观察者内和观察者间的变异性，调查使用横截面图像和教育对修复体不匹配测量方法的精度的影响。
使用计算机辅助复制技术（CART）、硅橡胶复制技术（RT）和切片技术（ST）获得边缘的横截面图像。25 名观察者在 2 周的间隔内，对每组图像进行 4 次绝对边缘差异值的测量；观察者接受了关于测量点选择的不同教育课程。使用似然比检验统计量（α=.05）和线性混合效应模型的组内相关系数来确定和比较测量精度。
CART 组的测量变化偏差最小，其次是 ST 和 RT 组（P<.001）。所有组的额外不匹配测量教育通常会降低偏差值，但没有显著差异。
测量方法获得的横截面图像和评估方法的教育影响了修复体不匹配测量的精度。数字方法可能是显著提高测量精度的有用工具。
