Department of Conservative Dentistry, Gangnam Severance Hospital, Yonsei University College of Dentistry, 211 Eonjuro, Gangnam-Gu, Seoul, 06273, Republic of Korea.
Department of Rehabilitation Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
Sci Rep. 2024 Jul 30;14(1):17489. doi: 10.1038/s41598-024-68538-w.
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.
尽管牙医普遍认为视觉辅助工具不仅可以改善视力，还可以帮助改善姿势，但证据很少。本研究旨在评估在幻影头的每个象限的第一磨牙上进行牙冠预备时，视觉辅助工具（放大镜和显微镜）对牙医肌肉的影响，同时考虑到牙医的肌肉、患者的牙齿位置和表面。共有来自一家三甲医院的 6 名右利手牙医参与了研究。表面肌电图仪记录了牙冠预备过程中双侧上斜方肌、胸锁乳突肌、颈伸肌和前三角肌的肌肉工作量。结果显示，与裸眼相比，使用显微镜时所有检查肌肉的工作量明显降低（p<0.05），而放大镜在某些特定肌肉中则降低了工作量。所有视觉辅助工具中肌肉工作量最大的是颈伸肌，其次是上斜方肌。当按牙齿表面分析时，虽然与裸眼相比，放大镜在每个表面上并没有显著降低整体工作量，但显微镜在大多数表面上显著降低了工作量（p<0.05）。因此，在进行牙冠预备时，使用放大镜或显微镜可以成功地减少研究肌肉的工作量。
