PDF(Pubmed)
Abstract：
Although there is consensus among dentists that visual aids not only improve vision but also help improve posture, evidence is scarce. This study aimed to evaluate the effect of visual aids (loupe and microscope) on the muscle workload of dentists during crown preparation on dentiform first molars in each quadrant of a phantom head, considering dentists\' muscles, patients\' tooth positions and surfaces. Six right-handed dentists from a single tertiary hospital participated. Surface electromyography device recorded the muscle workload of the bilateral upper trapezius, sternocleidomastoid, cervical erector spinae, and anterior deltoid during crown preparation. The results showed significantly lower workload in all examined muscles when using a microscope compared to the naked eye (p < 0.05), whereas the loupe showed reduced workload in some specific muscles. The muscle with the highest workload for all visual aids was the cervical erector spinae, followed by the upper trapezius. When analyzed by tooth surface, while the loupe did not significantly reduce overall workload compared to the naked eye for each surface, the microscope significantly reduced workload for most surfaces (p < 0.05). Therefore, during crown preparation, the workload of the studied muscles can successfully be reduced with the use of a loupe or microscope.
摘要：
尽管牙医一致认为，视觉辅助设备不仅可以改善视力，还可以帮助改善姿势，证据很少。这项研究旨在评估视觉辅助设备（放大镜和显微镜）对牙冠准备过程中牙医对幻影头每个象限的牙形第一磨牙的肌肉工作量的影响，考虑到牙医的肌肉，患者的牙齿位置和表面。来自一家三级医院的六名惯用右手的牙医参加了会议。体表肌电图仪记录双侧上斜方肌的肌肉负荷,胸锁乳突,宫颈勃起脊髓，和牙冠准备期间的前三角肌。结果表明，与肉眼相比，使用显微镜时，所有检查的肌肉的工作量显着降低（p<0.05），而放大镜显示某些特定肌肉的工作量减少。所有视觉辅助设备工作量最大的肌肉是宫颈竖脊肌，其次是上斜方肌。当通过牙齿表面分析时，虽然与每个表面的肉眼相比，放大镜并没有显着减少整体工作量，显微镜显着减少大多数表面的工作量（p<0.05）。因此,在冠准备期间，使用放大镜或显微镜可以成功地减少所研究肌肉的工作量。
