Statistical Analysis for Subjective and Objective Evaluations of Dental Drill Sounds.
Statistical Analysis for Subjective and Objective Evaluations of Dental Drill Sounds.
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DOI：
10.1371/journal.pone.0159926
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Hayashi M
中科院分区：
文献类型：
--
作者：
Yamada T;Kuwano S;Ebisu S;Hayashi M
牙科涡轮机手机（牙钻）产生的声音会显著影响牙科诊所的声环境。事实上，许多病人报告说，牙钻的声音消除了不愉快的感觉。尽管一些制造商已经尝试基于ISO 14457来降低牙钻在空转期间产生的声压级，但是在主动钻孔条件下由此类牙钻发出的声音可能对牙科诊所声环境产生负面影响。与牙钻声音相关的不愉快印象相关的物理指标尚未确定。在本研究中，心理测量牙钻声音进行的目的是促进改善声环境在牙科诊所。具体而言，我们研究了12种类型的牙钻在空转和钻孔条件下使用语义差异的声音引起的印象。分析显示，牙钻声音的印象在空转和钻孔条件之间以及在检查的钻头之间变化很大。这一发现表明，单独测量牙钻在空转条件下的声音可能不足以评估声音的影响。我们相关的心理评估的结果，相当于连续A加权声压级（LAeq）和锐度的物理指标的测量。因素分析结果显示，牙钻声音的印象包含两个因素：“金属性且不愉快”和“有力”。LAeq与“强有力的印象”有很强的关系，计算的锐度与“金属印象”呈正相关，LAeq和计算的锐度的组合预测“不愉快的印象”。目前的分析表明，除了降低声压级，细化牙钻声音的频率成分是很重要的，在牙科诊所创造一个舒适的声音环境。
The sound produced by a dental air turbine handpiece (dental drill) can markedly influence the sound environment in a dental clinic. Indeed, many patients report that the sound of a dental drill elicits an unpleasant feeling. Although several manufacturers have attempted to reduce the sound pressure levels produced by dental drills during idling based on ISO 14457, the sound emitted by such drills under active drilling conditions may negatively influence the dental clinic sound environment. The physical metrics related to the unpleasant impressions associated with dental drill sounds have not been determined. In the present study, psychological measurements of dental drill sounds were conducted with the aim of facilitating improvement of the sound environment at dental clinics. Specifically, we examined the impressions elicited by the sounds of 12 types of dental drills in idling and drilling conditions using a semantic differential. The analysis revealed that the impressions of dental drill sounds varied considerably between idling and drilling conditions and among the examined drills. This finding suggests that measuring the sound of a dental drill in idling conditions alone may be insufficient for evaluating the effects of the sound. We related the results of the psychological evaluations to those of measurements of the physical metrics of equivalent continuous A-weighted sound pressure levels (LAeq) and sharpness. Factor analysis indicated that impressions of the dental drill sounds consisted of two factors: “metallic and unpleasant” and “powerful”. LAeq had a strong relationship with “powerful impression”, calculated sharpness was positively related to “metallic impression”, and “unpleasant impression” was predicted by the combination of both LAeq and calculated sharpness. The present analyses indicate that, in addition to a reduction in sound pressure level, refining the frequency components of dental drill sounds is important for creating a comfortable sound environment in dental clinics.