• The Effect of Maxillary Features and Occlusal Parameters on "sh" Production in Control and Glossectomy Subjects

      Pedersen, Andrew David; Stone, Maureen L. (2017)
      This study examines the process by which the tongue articulates speech in glossectomy and control subjects using high resolution structural, and cine-MRI. Maxillary features and occlusal parameters are assessed in both groups to see if any effect on the amount of tongue volume displaced when contacting the anterior palate is noted. This volume amount is termed anteriority and measured against multiple variables. The independent variables include palate height, intercanine width, arch perimeter, orthodontic bicuspid extraction, overbite and overjet. The speech task of each subject is the sound "sh" extracted from a repeated word task. Results of the study showed statistically significant (p ≤ 0.05) differences in anteriority between glossectomy patients and controls, large versus small overbite, and an interaction between subject type and overbite. Data suggests having a larger overbite decreases the oral cavity size during "sh" sound and therefore increases tongue anteriority, especially in glossectomy subjects.
    • Effect of Maxillary Features on Tongue Anteriority in Glossectomy and Control Speakers

      Hwang, Jun Hyuk; Stone, Maureen L. (2015)
      This study examines the behavior of glossectomy (N = 15) and normal tongue (N =20) movement using combination of high-resolution and cine- MRI. The speech task "a souk" was used to measure anterior tongue displacement, termed "anteriority", from /uh/ to /s/. Effects on anteriority due to palate height, /s/ type, arch perimeter, canine width, and orthodontic extraction of teeth were measured on controls and patients. Results showed that all factors except canine width had no significant difference in anteriority of tongue. Canine width was significantly related to anteriority in an inverse relationship. The fact that arch perimeter is less important than canine width on anteriority is consistent with our understanding of the criticality of the location of the tongue tip, rather than the tongue body, in producing /s/. Data also suggests that less than average arch perimeter improves speech intelligibility in patients with T2 tumor of the tongue.