Accuracy of Recording Edentulous Arch Relations Using an Optical Jaw-Tracking System: An In Vitro Study

作者：Weiwei Li, Linlin Li, Yong Wang, Yuchun Sun, Qiufei Xie · 发表于：The International Journal of Prosthodontics · 年份：2021 · DOI：10.11607/ijp.7126 · 被引用次数：19 · 研究领域：Orthodontics and Dentofacial Orthopedics、Temporomandibular Joint Disorders、Dental Implant Techniques and Outcomes

PURPOSE: To establish a recording method for edentulous jaw relations and to perform quantitative accuracy evaluation in vitro. MATERIALS AND METHODS: 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. RESULTS: 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. CONCLUSION: 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 clin...