Correlation coefficients between adjective scale values and comfort index.

<p>Correlation coefficients between adjective scale values and comfort index.</p

Subjective impressions to the sounds of Drill E.

<p>Subjective impressions to the sounds of Drill E.</p

Raw data of the psychological experiment.

Participants' impressions elicited by the sound stimuli of 12 dental drills in idling and drilling conditions

Relationships between <i>L</i>_Aeq values and adjective scale values for “soft-loud”.

<p>Relationships between <i>L</i>_Aeq values and adjective scale values for “soft-loud”.</p

Relationships between calculated sharpness and adjective scale values for “metallic-deep”.

<p>Relationships between calculated sharpness and adjective scale values for “metallic-deep”.</p

Raw data of the physical metrics.

Equivalent continuous A-weighted sound pressure levels (LAeq) and sharpness in relation to drilling conditions of dental drills

Spectrograms of Drill E sound.

<p>A spectrogram is an image that incorporates frequency (y axis), time (x axis), and amplitude (brightness of color).</p

Relationship between <i>CI</i> (<i>L</i>_Aeq/10+sharpness) and the adjective scale values ‘pleasing-unpleasing’ and ‘dislike-not dislike’.

<p>Relationship between <i>CI</i> (<i>L</i>_Aeq/10+sharpness) and the adjective scale values ‘pleasing-unpleasing’ and ‘dislike-not dislike’.</p

Physical properties of the sounds produced by 12 types of dental drills.

<p>Physical properties of the sounds produced by 12 types of dental drills.</p

Results of multiple regression analysis.

<p>Results of multiple regression analysis.</p