模拟牙齿抛光过程中有线和无线牙钻手机对前臂肌肉活动、操作时间及易用性的比较

Comparison of Corded and Cordless Handpieces on Forearm Muscle Activity, Procedure Time and Ease of Use during Simulated Tooth Polishing.

作者信息

McCombs Gayle, Russell Daniel M

出版信息

J Dent Hyg. 2014 Dec;88(6):386-93.

Abstract

PURPOSE

Dental professionals suffer from a high prevalence of work-related musculoskeletal disorders (MSD). Dental hygienists in particular have a high prevalence of pain in the forearms and hands. The objective of this study was to compare 1 cordless handpiece to 2 corded handpieces during simulated tooth polishing in terms of the muscle loads (recorded as electromyography (EMG) activity), duration of polishing procedure, and dental hygienist opinion about ease of use.

METHODS

EMG was used to quantify muscle electrical activity of 4 forearm muscles during simulated dental polishing with 2 corded handpieces (HP-A and HP-B) and 1 cordless handpiece (HP-C). A convenience sample of 30 dental hygienists (23 to 57 years of age) with 1 to 20+ years of clinical practice experience completed the study. Each participant spent approximately 5 minutes polishing 3 predetermined teeth in each of the 4 quadrants. The sequence of the handpieces was randomly assigned. At the end of the study, participants completed a subjective end user evaluation of handpiece preference.

RESULTS

Muscle activity levels of 10th, 50th and 90th percentiles did not differ significantly between the 3 handpieces tested (p>0.05). However, total muscle workload (integrated EMG) was lowest for the cordless handpiece (HP-C), but this was only significantly less than HP-A (p<0.05). Polishing using the cordless handpiece (HP-C) (M=257 seconds, SD=112 seconds) took significantly less time than either the HP-A corded (M=290 seconds, SD=137 seconds) or HP-B corded handpiece (M=290 seconds, SD=126 seconds) (p<0.05). Overall, 50% of the study participants preferred the cordless handpiece, 37% preferred HP-A and 13% preferred HP-B (p<0.05).

CONCLUSION

Use of the cordless handpiece reduced the duration of polishing, which in turn led to less total muscle activity, but not muscle intensity. Overall, dental hygienists preferred the cordless handpiece.

摘要

目的

牙科专业人员患有与工作相关的肌肉骨骼疾病（MSD）的比例很高。尤其是牙科保健员，前臂和手部疼痛的比例很高。本研究的目的是在模拟牙齿抛光过程中，比较1种无线手机与2种有线手机在肌肉负荷（记录为肌电图（EMG）活动）、抛光过程持续时间以及牙科保健员对易用性的看法方面的差异。

方法

在使用2种有线手机（HP - A和HP - B）和1种无线手机（HP - C）进行模拟牙齿抛光期间，使用肌电图来量化4块前臂肌肉的肌肉电活动。选取30名年龄在23至57岁之间、具有1至20多年临床实践经验的牙科保健员作为便利样本完成了该研究。每位参与者在4个象限中的每个象限花费大约5分钟抛光3颗预先确定的牙齿。手机的使用顺序是随机分配的。在研究结束时，参与者完成了对手机偏好的主观最终用户评估。

结果

在测试的3种手机之间，第10、50和90百分位数的肌肉活动水平没有显著差异（p>0.05）。然而，无线手机（HP - C）的总肌肉工作量（积分肌电图）最低，但仅显著低于HP - A（p<0.05）。使用无线手机（HP - C）进行抛光（M = 257秒，SD = 112秒）所花费的时间明显少于HP - A有线手机（M = 290秒，SD = 137秒）或HP - B有线手机（M = 290秒，SD = 126秒）（p<0.05）。总体而言，50%的研究参与者更喜欢无线手机，37%更喜欢HP - A，13%更喜欢HP - B（p<0.05）。