Int J Prosthodont. 2022 May/June;35(3):302–310. doi: 10.11607/ijp.7126. Epub 2021 Feb 26.
To establish a recording method for edentulous jaw relations and to perform quantitative accuracy evaluation in vitro.
Maxillary and mandibular edentulous arch models and complete dentures were mounted on an articulator, simulating protrusion (A), left and right laterotrusion (B and C), and small opening jaw relations (D), aided by metal foil wax record. Using the tracking system, 3D trajectories of targets were recorded from intercuspation to A, B, C, and D, then used to rehabilitate digital arch relations of A, B, C, and D in the test group. Axial model surfaces were pasted with six pairs of positioning cylinders. The center points of the bottom surfaces of the cylinders in A, B, C, and D were measured to rehabilitate digital arch relations in the control group. With the maxilla as the common area, arch relations of the test group were registered in the control group; 3D deviations of the mandible were calculated, and displacements in horizontal left/right, horizontal anterior/posterior, and vertical directions were analyzed.
3D deviations of the mandible in A, B, C, and D were 131 ± 39 μm, 133 ± 44 μm, 120 ± 51 μm, and 112 ± 52 μm, respectively. Mean absolute values of displacements of the mandible were less than 200 μm.
By using the optical jaw tracking system, the accuracy of jaw relation records as measured on an articulator was acceptable for clinical demand. Further investigations among patients are required to clinically verify the results of this study.
建立无牙颌颌位关系记录方法并进行体外定量准确性评估。
将上颌和下颌无牙颌模型和全口义齿安装在牙合架上，模拟前伸（A）、左右侧方（B 和 C）和小开口颌位关系（D），辅助使用金属箔蜡记录。使用跟踪系统，从正中关系位记录目标的 3D 轨迹至 A、B、C 和 D，然后在实验组中使用这些轨迹来重建 A、B、C 和 D 的数字化颌位关系。轴向模型表面粘贴有六对定位圆柱。在 A、B、C 和 D 中测量圆柱底面中心点的位置，以重建对照组的数字化颌位关系。以上颌为共同区域，在对照组中注册实验组的颌位关系；计算下颌的 3D 偏差，并分析水平左右、水平前后和垂直方向的位移。
A、B、C 和 D 时下颌的 3D 偏差分别为 131 ± 39μm、133 ± 44μm、120 ± 51μm 和 112 ± 52μm。下颌的平均绝对位移值小于 200μm。
使用光学颌跟踪系统，牙合架上记录的颌位关系的准确性可满足临床需求。需要对患者进行进一步的研究，以临床验证本研究的结果。
