Department of Oral Anatomy and Physiology, West China College of Stomatology, Sichuan University, Chengdu, China.
Int J Oral Sci. 2010 Dec;2(4):208-14. doi: 10.4248/IJOS10071.
The purpose of this study is to compare the effects of the two clutches on recording the condylar movement.
Ten subjects (6 women, 4 men; mean age 25.4 years) participated in the study. The mandibular movement, sagittal condylar inclination angle, and transversal condylar inclination angle of each subject were recorded with the CADIAX using the two clutches, respectively. The characteristics of the tracings of the protrusion, opening, and mediotrusion were analyzed with the t-test statistics at a = 0.05 level. The Kappa values were calculated for an assessment of the congruence of the tracings.
The results showed that the contour, direction, and dimension of the tracings in the two clutches were approximately same, but the tracings determined by the functional occlusal clutch were more regular and congruent. In the group segment recorded with the tray clutch, opening/closing paths of one subject showed crossed and time curves of three subjects appeared peak-like changes of velocity, but none were statistically different (P>0.05).
The research suggests that the functional occlusal clutch should be preferred in the evaluation of the mandibular function, as the tracings with the tray clutch are more likely to produce false positive results.
本研究旨在比较两种牙合垫在记录髁突运动中的效果。
10 名受试者（6 名女性，4 名男性；平均年龄 25.4 岁）参与了本研究。使用 CADIAX 分别使用两种牙合垫记录每位受试者的下颌运动、矢状髁突倾斜角和横向髁突倾斜角。采用 t 检验统计分析突伸、开口和正中关系侧移轨迹的特征，显著性水平为 a = 0.05。计算 Kappa 值以评估轨迹的一致性。
结果表明，两种牙合垫的轨迹轮廓、方向和尺寸大致相同，但功能牙合垫确定的轨迹更规则和一致。在使用托盘牙合垫记录的组段中，一位受试者的开口/闭合轨迹出现交叉，三位受试者的速度时间曲线出现峰状变化，但均无统计学差异（P>0.05）。
研究表明，在评估下颌功能时应优先选择功能牙合垫，因为托盘牙合垫的轨迹更有可能产生假阳性结果。
