The Sound of the Dentist's Drill and Students' Anxiety Scores.
In a sample of 42 college students, a positive correlation of .51 with sound and .56 without sound was found between EMG scores and their total Dental Anxiety Scale scores for those who did and did not hear the drill.
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Scofield, L. E. and Helm, Herbert W., "The Sound of the Dentist's Drill and Students' Anxiety Scores." (2001). Faculty Publications. 2228.