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. 2023 Jun 20;41(6):463-466.
doi: 10.3760/cma.j.cn121094-20220617-00325.

[Occupational protection effect of two protective devices for manual cleaning and oiling of dental handpieces on operators]

[Article in Chinese]
M Han  1 , Z Y Shao  1 , L N Yin  1 , Y Q Che  1 , L X Qiu  1
Affiliations

[Occupational protection effect of two protective devices for manual cleaning and oiling of dental handpieces on operators]

[Article in Chinese]
M Han et al. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi. .

Abstract
in English, Chinese

Objective: To explore the occupational protective effect of different protective devices on the operators during manual cleaning and oiling of dental handpieces, and to provide a basis for the selection of appropriate protective methods. Methods: From November 2020 to December 2021, 20 high-speed dental handpieces of the same brand were selected and randomly divided into disposable protective bag group and small aerosol safety cabinet group by drawing lots, with 10 in each group. After recording the model, they were distributed to the clinical fixed consulting room for use, and were collected by specially-assigned personnel every day for manual cleaning under the protection of the two devices. By measuring the number of airborne colonies, the concentrations of particulate matter and the satisfaction of operators, the occupational protection effect of the two protective devices on operators was evaluated. Results: Under the protection of the two devices, the average number of airborne colonies after operation was less than 1 CFU/ml. When no protective device was used, the number concentration of particulate matter produced during operation was (21595.70±8164.26) pieces/cm(3). The number concentrations of particles produced by disposable protective bag group [ (6800.24±515.05) pieces/cm(3)] and small aerosol safety cabinet group [ (5797.15±790.50) pieces/cm(3)] were significantly lower than those without any protective device (P<0.001). The number concentration of particle matter of small aerosol safety cabinet group was significantly lower than that of disposable protective bag group (P<0.001). In the satisfaction evaluation of operators, small aerosol safety cabinet group [ (3.53±0.82) points] was significantly better than disposable protective bag group [ (2.23±1.10) points] (P<0.001) . Conclusion: The use of small aerosol safety cabinet during manual cleaning and oiling of dental handpieces has good protective effect, superior safety performance and strong clinical applicability, and has advantages in occupational protection of clinical operators.

目的： 探讨不同防护装置在牙科手机手工清洗时对操作人员的职业防护效果，为选择合适的防护方法提供依据。 方法： 于2020年11月至2021年12月，抽取同一品牌的高速牙科手机20支，采用抽签法，将其随机分为一次性防护袋组和小型防护箱组，每组各10支；记录型号后，分发至临床固定诊室使用，每日由专人统一回收后在两种装置的防护下进行手工清洗。通过测量空气菌落数、颗粒物数浓度和操作人员满意度，评价两种防护装置对操作人员的职业防护效果。 结果： 在两种装置防护下，操作后的环境平均空气菌落数均<1 CFU/ml。未使用任何防护装置时，操作中所产生的颗粒物数浓度为（21 595.70±8 164.26）个/cm(3)，而一次性防护袋组[（6 800.24±515.05）个/cm(3)]和小型防护箱组[（5 797.15±790.50）个/cm(3)]操作中产生的颗粒物数浓度均明显低于未使用任何防护装置（P<0.001）；小型防护箱组操作中所产生的颗粒物数浓度明显低于一次性防护袋组（P<0.001）。在操作人员满意度评价中，小型防护箱组[（3.53±0.82）分]明显优于一次性防护袋组[（2.23±1.10）分]（P<0.001）。 结论： 牙科手机手工清洗时使用小型防护箱的防护效果佳、安全性能优越、临床适用性强，在临床操作人员职业防护方面具有优势。.

Keywords: Aerosol; Cleaning; Dental handpiece; Dental technicians; Dentistry; Occupational exposure; Protective devices.

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