Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology.
Department of Prosthodontics, Peking University School and Hospital of Stomatology.
J Oral Sci. 2022 Jan 19;64(1):59-62. doi: 10.2334/josnusd.21-0382. Epub 2021 Dec 24.
The present study aimed to quantitatively evaluate the accuracy of the edentulous maxillomandibular relationship record for diagnostic complete dentures fabricated using computer-aided design (CAD) and three-dimensional (3D) printing.
Six edentulous patients were enrolled. The maxillomandibular relationship obtained from diagnostic complete dentures (DiaCD test group), that obtained from complete dentures with artificial teeth in the intercuspal position (CD control group), and the centric relationship acquired by gothic arch tracing (CR standard group) were recorded, and 3D surface scanning was performed on these records. Using the CR standard group as a reference, the DiaCD test and CD control group displacements were measured in the horizontal antero-posterior, horizontal right-and-left, and vertical directions. The displacements for the DiaCD test group were compared with those for the CD control group using the Wilcoxon matched-pairs signed rank test.
In terms of centric relationship, the 95% confidence interval of displacement in the horizontal antero-posterior direction was (0.54-1.89) mm in the DiaCD test group and (0.32-1.34) mm in the CD control group. The inter-group difference was significant (P = 0.03).
It is feasible to record the edentulous maxillomandibular relationship using diagnostic complete dentures fabricated by CAD/3D printing, but the protrusion of edentulous patients should not be neglected.
本研究旨在定量评估使用计算机辅助设计（CAD）和三维（3D）打印制作诊断性总义齿的无牙颌颌位关系记录的准确性。
纳入 6 名无牙颌患者。记录诊断性全口义齿（DiaCD 试验组）、牙尖交错位人工牙全口义齿（CD 对照组）和哥特弓描记获得的正中关系（CR 标准组）的颌位关系，并对这些记录进行 3D 表面扫描。以 CR 标准组为参考，测量 DiaCD 试验组和 CD 对照组在水平前-后、水平左-右和垂直方向上的位移。使用 Wilcoxon 配对符号秩检验比较 DiaCD 试验组与 CD 对照组的位移。
在正中关系方面，DiaCD 试验组水平前-后方向的位移 95%置信区间为（0.54-1.89）mm，CD 对照组为（0.32-1.34）mm。组间差异有统计学意义（P=0.03）。
使用 CAD/3D 打印制作的诊断性总义齿记录无牙颌颌位关系是可行的，但不应忽视无牙颌患者的前伸。
