School of Mechanical Engineering, Guizhou University, Guiyang, China.
Guizhou Equipment Manufacturing Polytechnic, Guiyang, China.
Clin Oral Investig. 2024 May 2;28(5):292. doi: 10.1007/s00784-024-05683-6.
Exposure to aerosol particles generated from tooth grinding has a negative impact on the health of dental personnel. The aim of this study was to quantitatively analyze the impact of indoor relative humidity (IRH) on the deposition of these suspended particles in a well-controlled dental environment.
In this study, a humidity control system was employed to effectively regulate and maintain indoor relative humidity (IRH). A novel computer-assisted numerical control system was developed to pre-treat the molar specimens, and accurately simulate clinical tooth grinding procedures. Each procedure was performed in triplicate, with an online real-time particle counter (ORPC; TR-8301, TongrenCo.) measuring aerosol production. All testing devices were controlled remotely. The data obtained were statistically analyzed using descriptive statistics and non-parametric tests (Kruskal-Wallis/ Dunn's post hoc test with Bonferroni correction, p < 0.05).
The findings showed that with increasing IRH, the maximum peak concentration of aerosol particles decreased by 397% from 6.51 × 10 particles/m at 30% to 1.64 × 10 particles/m at 80%. The Kruskal-Wallis test results indicated a statistically significant effect of IRH on the aerosol increment (p < 0.05).
Increasing the IRH level can effectively promote the deposition of aerosol particles, with a return to baseline within 15 min after reaching 60% or above.
Our study suggested that maintaining IRH above 70% during the cleaning process, allowing natural recovery to ambient humidity levels within 15 min after cleaning, and taking basic precautions, may lead to an adequate reduction in the possible health risks of aerosol contamination.
牙体磨削产生的气溶胶颗粒会对牙科医务人员的健康产生负面影响。本研究的目的是定量分析室内相对湿度（IRH）对这些悬浮颗粒在可控牙科环境中沉积的影响。
本研究采用湿度控制系统有效调节和维持室内相对湿度（IRH）。开发了一种新型计算机辅助数控系统，对磨牙标本进行预处理，并准确模拟临床磨牙程序。每个程序重复进行三次，使用在线实时粒子计数器（ORPC；TR-8301，TongrenCo.）测量气溶胶产生情况。所有测试设备均远程控制。使用描述性统计和非参数检验（Kruskal-Wallis/Dunn 事后检验和 Bonferroni 校正，p<0.05）对获得的数据进行统计分析。
结果表明，随着 IRH 的增加，气溶胶颗粒的最大峰值浓度从 30%时的 6.51×10 颗粒/m 降低到 80%时的 1.64×10 颗粒/m，降低了 397%。Kruskal-Wallis 检验结果表明，IRH 对气溶胶增量有统计学显著影响（p<0.05）。
增加 IRH 水平可以有效促进气溶胶颗粒的沉积，在达到 60%或以上后 15 分钟内可恢复到基线水平。
本研究表明，在清洁过程中保持 IRH 高于 70%，在清洁后 15 分钟内让其自然恢复到环境湿度水平，并采取基本的预防措施，可能会充分降低气溶胶污染的潜在健康风险。
