281 - Effects of Hearing Protection on Speech Intelligibility in Pediatric Dentistry

Abstract:

Purpose: Pediatric dentists are regularly exposed to loud noises in the dental clinic, and the use of hearing protective devices (HPDs) can help prevent noise-induced hearing loss. Depending on the sound characteristics and type of HPD, the use of HPDs could potentially positively or negatively affect communication between dental team members. Limited dental-specific evidence exists on this subject. The purpose of this study is to examine the effect of passive noise cancellation devices on speech intelligibility in a simulated pediatric dental environment.

Methods: Simulated pediatric dental soundscapes were created by combining field recordings with commercially available sounds. To simulate the use of hearing protection, digital signal processing was applied to each soundscape based on attenuation data from 4 different types of passive HPDs (Mack’s Ultra Soft-Foam, Ohropax Classic, Etymotic ER-20, and Loop Experience 2). The modified soundscapes were then used to create a modified MUSHRA survey for members of the AAPD to rate the clarity of speech from a scale of 0-100. Repeated measures ANOVA test with a 5% significance level was used to assess for differences in clarity of speech among recordings.

Results: All HPDs had significantly lower clarity of speech for both Recall and Restorative Scenarios (p < 0.001). In both scenarios, Etymotic ER-20 and Loop Experience 2 had significantly higher scores compared to both Mack’s Ultra Soft Foam and Ohropax Wax (p < 0.001).

Conclusion: The use of HPDs has a significant effect on the clarity of speech in both recall and restorative appointments. Pediatric dentists should weigh the benefits of HPDs against their effects on speech intelligibility in the dental office.



Identify Supporting Agency and Grant Number: Research supported by the Indiana University School of Dentistry Graduate Student Research Committee.