Maxillary dental arch form related to voice classification: a pilot study.

This pilot study evaluated maxillary dental arch form dimensions and volume to determine if these parameters could be predictors for or related to voice classification. Nine white female professional singers ranging in age from 26 years to 53 years were studied. A maxillary dental impression and stone dental casts were made using standard dental procedures. Measurements were made from 10 points on each cast to determine the depth of the palate measured from first molar (depth A) and from first bicuspid (depth B), the width measured from cuspid-to-cuspid (width A) and from second molar to second molar (width B), and the length of the palate. An impression of the palatal arch of each cast was made to determine the volume of the palate using fluid displacement methods. Audio recordings were made for each subject, and based on speaking fundamental frequency, spectral analysis, voice profile, and tessitura confirmation, the actual voice classification of each subject in soprano, mezzo, and alto was achieved. Correlation and discriminant analysis tests were performed on the data. The discriminant analysis revealed that no single measurement is a predictor for voice classification. However, the discriminant analysis applied to the predictors depth A, depth B, and volume gives optimal results, ie, each subject was classified in her true group.