Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Aßmannshauser Str 4-6, 14197, Berlin, Germany.
Department of Digital Dentistry - Occlusion and Function Therapy, Centre of Dentistry and Oral Health, Ernst Moritz Arndt University of Greifswald, 17475, Greifswald, Germany.
Clin Oral Investig. 2018 Mar;22(2):773-782. doi: 10.1007/s00784-017-2152-9. Epub 2017 Jul 4.
In a double-blinded randomized controlled clinical trial, the impact of face-bow registration for remounting complete dentures (CDs) on the occlusal parameters (part I) was evaluated.
New CDs of 32 patients were duplicated and mounted after intraoral pin registration according to mean settings (group 1) and (group 2) using a face-bow (arbitrary hinge axis). The vertical dimension was reduced to the first occlusal contact point, and a bite record was fabricated in the articulator. The number of contacts and the number of teeth in contact were evaluated by a computer program (laboratory result). After randomization, half of the CDs were adjusted according to protocol of group 1 and group 2 and delivered to the patients. After 3 days (T1) and 84 days (T2), clinical static contact points and teeth in contact were counted. Contact points and teeth in contact of both groups (laboratory results) and at different moments (clinical results) were analyzed statistically with the F test and bootstrapping.
Laboratory: No. 2 (face-bow) showed more occlusal contact points than no. 1 (mean setting), p > 0.05. The number of teeth with at least one occlusal contact was significantly higher in no. 2 (p = 0.027). Clinic: The mean number of teeth with at least one clinical contact point was significantly higher in no. 1 (no. 1 = 7.13, no. 2 = 5.31; p = 0.042). Extent of the vertical shift poorly correlated with number of laboratory occlusal contact points (R = 0.017).
Considering the complex multistep study design, a limited number of participants, and referring to one specific arbitrary face-bow, the following conclusion could be drawn: no substantial difference by the use of the arbitrary face-bow compared to a mean setting could be determined, when changing the vertical dimension in the articulator within a remounting procedure of complete dentures.
Further research is necessary to determine the effects of different arbitrary face-bows on the fabrication and adaptation of removable dentures.
在一项双盲随机对照临床试验中，评估了面弓重新安装全口义齿（CD）时的登记对咬合参数（第一部分）的影响。
对 32 名患者的新 CD 进行复制，并根据平均值设置（第 1 组）和（第 2 组）使用面弓（任意铰链轴）进行口内针注册后进行安装。垂直尺寸减小到第一个咬合接触点，并在颌架上制作咬合记录。通过计算机程序（实验室结果）评估接触点的数量和接触的牙齿数量。随机化后，一半的 CD 根据第 1 组和第 2 组的方案进行调整，并交付给患者。在 3 天（T1）和 84 天（T2）后，计算临床静态接触点和接触的牙齿。使用 F 检验和自举法对两组（实验室结果）和不同时刻（临床结果）的接触点和接触的牙齿进行统计学分析。
实验室：第 2 组（面弓）的咬合接触点多于第 1 组（平均值），p>0.05。至少有一个咬合接触点的牙齿数量在第 2 组中显著更高（p=0.027）。临床：第 1 组的至少有一个临床接触点的牙齿数量显著更高（第 1 组=7.13，第 2 组=5.31；p=0.042）。垂直移位的程度与实验室咬合接触点的数量相关性较差（R=0.017）。
考虑到复杂的多步骤研究设计、参与者数量有限以及参考特定的任意面弓，在重新安装全口义齿的过程中，当在颌架中改变垂直尺寸时，使用任意面弓与平均值设置相比，无法确定有明显的差异。
需要进一步研究确定不同任意面弓对可摘义齿的制作和适应的影响。
