Son KeunBaDa, Lee Ji-Min, Son Young-Tak, Kim Jin-Wook, Jin Myoung-Uk, Lee Kyu-Bok
Advanced Dental Device Development Institute (A3DI), Kyungpook National University, Daegu 41940, Korea.
Department of Dental Science, Graduate School, Kyungpook National University, Daegu 41940, Korea.
Bioengineering (Basel). 2022 Aug 1;9(8):358. doi: 10.3390/bioengineering9080358.
The purpose of this study was to evaluate muscle activation and fatigue in the operator during tooth preparation and intraoral scanning by simulating these tasks in two types of dental unit chair systems (UCS). Six participants were recruited, and the above tasks were simulated. Electrodes were placed on the skin over five types of muscles (arm, neck, and shoulder muscles), and the maximal voluntary contraction (MVC) was measured. Electromyography (EMG) was assessed during the simulation, and EMG values were normalized using MVC. The root mean square (RMS) EMG (%MVC) and muscle fatigue (%) were calculated. Owing to a lack of normal distribution of the data, Mann−Whitney U test and Kruskal−Wallis H test were performed for statistical comparison, and Bonferroni adjustment was performed for multiple comparisons (α = 0.05). There was no significant difference in RMS EMG between the two types of dental UCS (intraoral scanning, p = 0.237; tooth preparation, p = 0.543). Moreover, the RMS EMG and muscle fatigue were not significantly different between the two tasks (p > 0.05). There was significant muscle fatigue after the intraoral scanner use was simulated thrice (p < 0.001). It is necessary to refrain from performing continuous intraoral scanning and tooth preparation and to take appropriate rest to reduce the incidence of musculoskeletal disorders in dentists in clinical settings.
本研究的目的是通过在两种牙科治疗椅系统（UCS）中模拟这些任务，评估操作人员在牙齿预备和口腔内扫描过程中的肌肉激活和疲劳情况。招募了6名参与者，并模拟了上述任务。将电极放置在五种类型肌肉（手臂、颈部和肩部肌肉）上方的皮肤上，并测量最大自主收缩（MVC）。在模拟过程中评估肌电图（EMG），并使用MVC对EMG值进行标准化。计算均方根（RMS）EMG（%MVC）和肌肉疲劳（%）。由于数据缺乏正态分布，进行Mann-Whitney U检验和Kruskal-Wallis H检验进行统计比较，并进行Bonferroni校正进行多重比较（α = 0.05）。两种类型的牙科UCS之间的RMS EMG没有显著差异（口腔内扫描，p = 0.237；牙齿预备，p = 0.543）。此外，两项任务之间的RMS EMG和肌肉疲劳没有显著差异（p > 0.05）。在模拟三次使用口腔内扫描仪后出现了显著的肌肉疲劳（p < 0.001）。有必要避免连续进行口腔内扫描和牙齿预备，并进行适当休息，以降低临床环境中牙医肌肉骨骼疾病的发生率。
