Effects of the Palatal Form on Formant Frequency during Phonation after Insertion of Palatal Plate

Abstract

Compensatory movement of articulation organs to reduce dysphonia due to the denture base differs among individuals. These differences are considered to be associated with the palatal form in each individual. We evaluated the differences in the palatal form on phonation after insertion of the palatal plate by analyzing Formant frequency (difference between F₁ and F₂) which corresponds to the antero-posterior tongue position. In group A with a deep palate, the plate markedly affected the difference between F₁ and F₂ during phonation of final vowels (/a/, /o/). However, in group C with a shallow palate, no marked changes were observed.