Tăut Manuela, Chanteux Solene, Kui Andreea, Buduru Rareș, Negucioiu Marius, Manziuc Manuela, Gheorghiu Ioana, Hedeșiu Mihaela, Buduru Smaranda, Ilea Aranka
Department of Oral Rehabilitation, "Iuliu Hațieganu" University of Medicine and Pharmacy, 400029 Cluj-Napoca, Romania.
Department of Prosthetic Dentistry and Dental Materials Department, Iuliu Hațieganu University of Medicine and Pharmacy, 32 Clinicilor Street, 400006 Cluj-Napoca, Romania.
J Clin Med. 2024 Dec 19;13(24):7761. doi: 10.3390/jcm13247761.
: Eccentric bruxism is a complex parafunctional activity that involves grinding of teeth and occurs more frequently during sleep. This study aimed to assess differences in condylar parameters (sagittal condylar inclination -SCI and Bennett angle -BA) and mandibular and condylar kinematics during functional and parafunctional movements in bruxers and non-bruxers and to assess a digital method for quantifying eccentric bruxism using an optical jaw tracking system (Modjaw). : The study group included subjects diagnosed with eccentric bruxism according to validated clinical diagnostic criteria. A control group of non-bruxer subjects with demographic characteristics similar to the study group was considered. Each participant underwent Modjaw examination twice to assess the recordings' repeatability. The anterior guidance, mastication, and simulated eccentric bruxism were recorded. The SCI and BA were computed. The trajectories of interincisal inferior point (IIP), left condyle (LC), and right condyle (RC) in the frontal (F), sagittal (S), and horizontal (H) planes were outlined in rectangles to calculate areas of mastication and areas of eccentric bruxism (mm). Intraclass correlation coefficient (ICC) was used to assess the recordings' repeatability. Comparisons between groups were performed using Student's t- and Mann-Whitney tests. The receiver-operator characteristic (ROC) curve was used to assess the diagnostic quality of the digital method. Twenty bruxers (10 F and 10 M) and 20 non-bruxers (10 F and 10 M) were included. The ICC had values higher than 0.85. SCI, BA, and area of mastication for IIP, LC, and RC were similar between the groups ( > 0.05). The area of eccentric bruxism was significantly wider in the bruxers ( < 0.001). According to the ROC curve, the following cut-off areas (mm) for eccentric bruxism were found in F, S, and H planes: IIP (18.05, 13.43, 16.28); LC (3.74, 10.83, 3.35); and RC (4.21, 10.63, 2.9), corresponding to sensitivity > 0.8, specificity > 0.75 and area under the curve (AUC) > 0.85. Mandibular and condylar kinematics during functional movements were similar in bruxers and non-bruxers. A novel digital method for quantifying eccentric bruxism was found using Modjaw, which could serve as a tool for early detection of eccentric bruxism before the onset of clinical consequences.
偏侧磨牙症是一种复杂的副功能活动，涉及磨牙，且在睡眠期间更频繁发生。本研究旨在评估磨牙症患者和非磨牙症患者在功能运动和副功能运动期间髁突参数（矢状髁突倾斜度 - SCI和 Bennett角 - BA）以及下颌和髁突运动学的差异，并评估一种使用光学颌骨跟踪系统（Modjaw）量化偏侧磨牙症的数字方法。：研究组包括根据经过验证的临床诊断标准被诊断为偏侧磨牙症的受试者。考虑了一个具有与研究组相似人口统计学特征的非磨牙症受试者对照组。每位参与者接受两次Modjaw检查以评估记录的重复性。记录前导、咀嚼和模拟偏侧磨牙症。计算SCI和BA。在额状面（F）、矢状面（S）和水平面（H）中，切牙间下点（IIP）、左髁突（LC）和右髁突（RC）的轨迹用矩形勾勒出来，以计算咀嚼面积和偏侧磨牙症面积（mm）。组内相关系数（ICC）用于评估记录的重复性。使用学生t检验和曼 - 惠特尼检验进行组间比较。受试者工作特征（ROC）曲线用于评估数字方法的诊断质量。纳入了20名磨牙症患者（10名女性和10名男性）和20名非磨牙症患者（10名女性和10名男性）。ICC值高于0.85。两组之间IIP、LC和RC的SCI、BA和咀嚼面积相似（>0.05）。磨牙症患者的偏侧磨牙症面积明显更宽（<0.001）。根据ROC曲线，在F、S和H平面中发现偏侧磨牙症的以下截断面积（mm）：IIP（18.05、13.43、16.28）；LC（3.74、10.83、3.35）；和RC（4.21、10.63、2.9），对应敏感性>0.8、特异性>0.75且曲线下面积（AUC）>0.85。磨牙症患者和非磨牙症患者在功能运动期间的下颌和髁突运动学相似。使用Modjaw发现了一种量化偏侧磨牙症的新型数字方法，该方法可作为在临床后果出现之前早期检测偏侧磨牙症的工具。
