G050023 Effects of the degree of overbite on the intraoral fluid dynamics upon the production of sibilant /s/

Abstract

A large eddy simulation was implemented to investigate the effect of the degree of overbite, which refers to the extent of vertical overlap of the maxillary central incisors over the mandibular central incisors, on the flow in the simplifiedoral cavity model that morphologically simplifies the oral cavity when sibilant was produced. The result illustrated thathigh Powell's sound sources were generated along the upstream surface of the upper obstacle to which a flow separatedfrom the lower obstacle impinged and in the separated flow from the edge of the upper obstacle. Extension of theoverbite resulted in enlargement of the regions of large Powell's sound sources in those regions.