PDF(Pubmed)
Abstract：
BACKGROUND: Minimizing muscle strain and reducing the risk of musculoskeletal disorders associated with intraoral scanner (IOS) usage require ergonomic awareness, device selection, and workplace adjustments in dental practice. This preliminary clinical study aimed to simulate intraoral scanning tasks using wired and wireless IOSs and assess muscle activation and fatigue for both types.
METHODS: Fourteen participants performed intraoral scanning tasks using wired and wireless IOSs (i700; MEDIT), with weights of 280 g and 328 g, respectively. The same computer system and software conditions were maintained for both groups (N = 14 per IOS group). Electrodes were placed on arm, neck, and shoulder muscles, and maximal voluntary contraction (MVC) was measured. Surface electromyography (EMG) was performed during the simulation, and EMG values were normalized using MVC. The root mean square EMG (%MVC) and muscle fatigue (%) values were calculated. Statistical comparisons were performed using the Mann-Whitney U and Friedman tests, with the Bonferroni adjustment for multiple comparisons (α = 0.05).
RESULTS: Arm (flexor digitorum superficialis) and neck muscles (left sternocleidomastoid and left splenius capitis) showed significantly higher EMG values with wireless IOS (P < 0.05). The neck (left sternocleidomastoid and right levator scapulae) and shoulder muscles (right trapezius descendens) demonstrated significantly higher muscle fatigue with wireless IOS (P < 0.05).
CONCLUSIONS: The consecutive use of heavier wireless IOS may increase the risk of muscle activation and fatigue in certain muscles, which may have clinical implications for dentists in terms of ergonomics and musculoskeletal health.
METHODS: Fourteen participants performed intraoral scanning tasks using wired and wireless IOSs (i700; MEDIT), with weights of 280 g and 328 g, respectively. The same computer system and software conditions were maintained for both groups (N = 14 per IOS group). Electrodes were placed on arm, neck, and shoulder muscles, and maximal voluntary contraction (MVC) was measured. Surface electromyography (EMG) was performed during the simulation, and EMG values were normalized using MVC. The root mean square EMG (%MVC) and muscle fatigue (%) values were calculated. Statistical comparisons were performed using the Mann-Whitney U and Friedman tests, with the Bonferroni adjustment for multiple comparisons (α = 0.05).
RESULTS: Arm (flexor digitorum superficialis) and neck muscles (left sternocleidomastoid and left splenius capitis) showed significantly higher EMG values with wireless IOS (P < 0.05). The neck (left sternocleidomastoid and right levator scapulae) and shoulder muscles (right trapezius descendens) demonstrated significantly higher muscle fatigue with wireless IOS (P < 0.05).
CONCLUSIONS: The consecutive use of heavier wireless IOS may increase the risk of muscle activation and fatigue in certain muscles, which may have clinical implications for dentists in terms of ergonomics and musculoskeletal health.
摘要：
背景：最大程度地减少肌肉拉伤并降低与口内扫描仪（IOS）使用相关的肌肉骨骼疾病的风险需要人体工程学意识，设备选择,以及牙科实践中的工作场所调整。这项初步临床研究旨在使用有线和无线IOS模拟口内扫描任务，并评估两种类型的肌肉激活和疲劳。
方法：14名参与者使用有线和无线IOS（i700；MEDIT）执行口腔内扫描任务，重量为280克和328克，分别。两组保持相同的计算机系统和软件条件(每个IOS组N=14)。电极放在手臂上，脖子,和肩部肌肉，测量最大自愿收缩(MVC)。在模拟过程中进行了表面肌电图（EMG），和肌电图值使用MVC进行归一化。计算肌电图均方根(%MVC)和肌肉疲劳(%)值。使用Mann-WhitneyU和Friedman检验进行统计比较，用Bonferroni调整多重比较(α=0.05)。
结果：手臂（指浅屈肌）和颈部肌肉（左胸锁乳突和左腹脾炎）在无线IOS下显示出明显更高的EMG值（P<0.05）。颈部（左胸锁乳突肌和右肩胛骨提上肌）和肩部肌肉（右斜方肌下降）表现出明显高于无线IOS的肌肉疲劳（P<0.05）。
结论：连续使用较重的无线IOS可能会增加某些肌肉的肌肉激活和疲劳的风险，这可能对牙医在人体工程学和肌肉骨骼健康方面有临床意义。
方法：14名参与者使用有线和无线IOS（i700；MEDIT）执行口腔内扫描任务，重量为280克和328克，分别。两组保持相同的计算机系统和软件条件(每个IOS组N=14)。电极放在手臂上，脖子,和肩部肌肉，测量最大自愿收缩(MVC)。在模拟过程中进行了表面肌电图（EMG），和肌电图值使用MVC进行归一化。计算肌电图均方根(%MVC)和肌肉疲劳(%)值。使用Mann-WhitneyU和Friedman检验进行统计比较，用Bonferroni调整多重比较(α=0.05)。
结果：手臂（指浅屈肌）和颈部肌肉（左胸锁乳突和左腹脾炎）在无线IOS下显示出明显更高的EMG值（P<0.05）。颈部（左胸锁乳突肌和右肩胛骨提上肌）和肩部肌肉（右斜方肌下降）表现出明显高于无线IOS的肌肉疲劳（P<0.05）。
结论：连续使用较重的无线IOS可能会增加某些肌肉的肌肉激活和疲劳的风险，这可能对牙医在人体工程学和肌肉骨骼健康方面有临床意义。
