Objective: To compare and evaluate the difference in maxillary dentition position using an anatomical facebow and jaw movement analyzer. Methods: From March to May 2023, 15 medical interns from Yantai Stomatological Hospital were recruited, including 9 males and 6 females, aged 20-25 years. Digital models and plaster models of maxillary dentition were obtained from the 15 medical interns. The anatomical facebow group (AFB) and jaw movement analyzer group (JMA) were used to transfer the position of the maxillary dentition to the virtual articulator. The virtual occlusal articulator module of exocad denture design software was used to measure the inclination angle of the occlusal plane of the two groups, the distance between the mesio-incisal angle of the left maxillary central incisor and the lateral center point of the lateral condylar sphere of the virtual occlusal articulator, the distance between the mesial buccal cusp of the maxillary first molar and the lateral center point of the lateral condyle sphere of the virtual articulator. The same marks (mesial incisor point of left maxillary central incisor and mesial buccal cusp point of both maxillary first molars) were measured in two groups of maxillary dentition, and the root-mean-square error between 3 points was calculated. Results: The occlusal plane inclination angle in AFB group (9.11°±3.85°) was significantly larger than that in JMA group (4.94°±2.69°) (t=10.45, P<0.001). There were significant differences between AFB and JMA groups. The distances from the mesial cusp of the left first molar to the lateral center of the left condylar, from the mesial cusp of the left maxillary central incisor to the lateral center of the left condylar[(91.75±3.05), (129.09±4.60) mm]were significantly smaller than those in the JMA group[(95.68±5.45), (132.41±5.64) mm](t=-4.48, P=0.001; t=-4.21, P=0.001). In both groups of models, the distance of the mesial cusp of the left maxillary central incisor was (8.81±2.56) mm, and the distance between mesial buccal cusp of maxillary left first molar was (7.56±2.49) mm, the distance between mesial buccal cusp of maxillary right first molar was (7.13±2.77) mm; the root mean square error was (7.93± 2.94) mm. Compared with 0, the difference was statistically significant (t=10.45, P<0.001). Conclusions: There were differences between the two methods (anatomical facebow and the jaw movement analyzer) for transferring the maxillary dentition position to the three-dimensional space position of the virtual articulator.
目的： 探讨两种数字化转移方法定位后上颌牙列三维位置的差异，以期为临床提供参考。 方法： 2023年3—5月获取滨州医学院附属烟台市口腔医院15名实习医学生的上颌牙列数字化模型及石膏模型。使用解剖式面弓（AFB组）和下颌运动分析仪（JMA组）转移上颌牙列位置至虚拟（牙合）架，通过exocad义齿设计软件的虚拟（牙合）架模块测量两组（牙合）平面倾斜角度、上颌左侧中切牙近中切点至虚拟（牙合）架双侧髁球外侧中心点的距离、上颌双侧第一磨牙近中颊尖点至虚拟（牙合）架同侧髁球外侧中心点的距离以及两组上颌牙列相同标志点（上颌左侧中切牙近中切点、上颌双侧第一磨牙近中颊尖点）间距离，并计算3点间均方根误差。 结果： AFB组（牙合）平面倾斜角度（9.11°±3.85°）显著大于JMA组（4.94°± 2.69°）（t=10.45，P<0.001）。AFB组上颌左侧第一磨牙近中颊尖点至左侧髁球外侧中心点的距离、上颌左侧中切牙近中切点至左侧髁球外侧中心点的距离［分别为（91.75±3.05）、（129.09±4.60）mm］均显著小于JMA组［分别为（95.68±5.45）、（132.41±5.64）mm］（t=-4.48，P=0.001；t=-4.21，P=0.001）。两组模型上颌中切牙近中切点间距离为（8.81±2.56）mm、上颌左侧第一磨牙近中颊尖点间距离为（7.56±2.49）mm、上颌右侧第一磨牙近中颊尖点间距离为（7.13±2.77）mm；均方根误差值为（7.93±2.94）mm，与0相比差异有统计学意义（t=10.45，P<0.001）。 结论： 使用两种方法（解剖式面弓和下颌运动分析仪）转移上颌牙列位置至虚拟（牙合）架中的三维空间位置存在差别。.