Ozawa Aya, Suzuki Yoshitaka, Okura Kazuo, Tajima Toyoko, Taniwaki Tatsuya, Shibagaki Akari, Moreno Fabillar Jaime Jr, Okawa Toshinori, Abe Susumu, Shigemoto Shuji, Matsuka Yoshizo
Department of Stomatognathic Function and Occlusal Reconstruction, Graduate School of Biomedical Sciences, Tokushima University, Tokushima, Japan.
Department of Comprehensive Dentistry, Tokushima University Graduate School, Tokushima, Japan.
J Prosthodont Res. 2025 Jul 10. doi: 10.2186/jpr.JPR_D_24_00315.
To establish the relationship between rhythmic masticatory muscle activity (RMMA) of the masseter muscle during sleep bruxism (SB) and occlusal wear and distortion in the stabilization occlusal appliance (OcA) used for its treatment.
Seventeen adults with SB wore OcAs composed of polymethyl methacrylate for 28 days. Weekly recordings included electromyography (EMG) of the masseter muscle using a wearable EMG device, evaluation of SB variables, and 3D scanning of the OcA using a 3D dental model scanner. The awake bite force at the time of recruitment was measured using a film-based bite force measurement system. The 3D data collected weekly before and after wearing the OcA were superimposed, and the weekly deformations in the coronal-apical directions were calculated. The masseter muscle activity per hour (RMMA index) and OcA deformation were compared weekly. Finally, we investigated the relationship between the frequency and intensity of the masseter muscle activity patterns and OcA deformation.
No significant differences were observed in weekly RMMA index; however, all OcA deformations were significant. Apical deformation, including occlusal wear, was positively correlated with awake bite force. Coronal deformation reflecting distortion was positively correlated with the number of sustained tonic masseter muscle activities and maximum masseter muscle activities.
OcA deformation measured using this system reflects the frequency and intensity of the RMMA and masseter muscle activity in patients with SB, suggesting its potential as a novel clinical diagnostic tool for SB.
建立睡眠磨牙症（SB）期间咬肌的节律性咀嚼肌活动（RMMA）与用于治疗的稳定咬合矫治器（OcA）的咬合磨损及变形之间的关系。
17名患有SB的成年人佩戴由聚甲基丙烯酸甲酯制成的OcA，为期28天。每周的记录包括使用可穿戴式肌电图（EMG）设备对咬肌进行肌电图检查、评估SB变量，以及使用3D牙科模型扫描仪对OcA进行3D扫描。使用基于薄膜的咬力测量系统测量招募时的清醒咬力。将佩戴OcA前后每周收集的3D数据进行叠加，并计算冠-根方向的每周变形。每周比较咬肌每小时的活动（RMMA指数）和OcA变形。最后，我们研究了咬肌活动模式的频率和强度与OcA变形之间的关系。
每周RMMA指数未观察到显著差异；然而，所有OcA变形均显著。包括咬合磨损在内的根尖变形与清醒咬力呈正相关。反映变形的冠向变形与咬肌持续强直性活动次数和咬肌最大活动呈正相关。
使用该系统测量的OcA变形反映了SB患者RMMA和咬肌活动的频率和强度，表明其作为SB新型临床诊断工具的潜力。
