| Project/Area Number |
06454555
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | Showa University |
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Principal Investigator |
TSUMITA Masakazu Showa University, School of Dentistry, Assistant professor, 歯学部, 助教授 (00138504)
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| Co-Investigator(Kenkyū-buntansha) |
SHIBATA Masahiro Showa University, School of Dentistry, Assistant, 歯学部, 助手 (60235588)
SUZUKI Yoshiyuki Showa University, School of Dentistry, Assistant, 歯学部, 助手 (70216464)
HATA Hirobumi Showa University, School of Dentistry, lecturer, 歯学部, 講師 (30198741)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Velopharyngel fiberscopy / Maxillary defect / Articulation test / Nasalance / Sound spectrograph / Nasometer / Speech disorder / nasalance |
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| Research Abstract |
The purpose of the study was to evaluate speech disorder improvement by the maxillary prostheses of which palatal shape were modified utilizing the palatography in the patients with maxillary defect after surgery.
The velopharyngeal movements of various activities are observed by velopharyngeal fiberscope. The palatal contour of the prostheses were examined using "Palatography including teeth" and modified so as to show proper tongue-to-palate and teeth contact. The artificial palates made of black vinyl seat covering the palate and occlusal surfaces of maxillary teeth were coated with white alginate powder and inserted into the mouths of the subjects. After pronunciation of test sound, the tongue contact areas were demonstrated by wetting of powder. Each subject's five samples of same sound were averaged by the image processor system. The test sounds were voiceless plosive, voiced plosive and flapped sounds.
Changes in speech of subjects before (BT) and after insertion of the maxillary prostheses (AT) were evaluated by the articulation tests : (1) The acoustical speech articulation test ; (2) the nasality measured by Nasometer (Model 6200-2) with reference to the nasalance scores ; (3) voice print analyzed by a sound spectrograph (sonagram).
The subjects were ten normal dentulous adults and five patients with maxillary defect by operation. They were classified into three groups according to the extent of the defect : Class I ; within hard plate (two). Class II ; including soft plate (one). Class III ; reaching as far as posterior border of soft palate (two).
The results were as follows :
1. The articulation test score were low in BT., but became higher in AT..
2. The nasalance scores of class I, II in BT.were high, but that in AT.were fairly close to that of normal subjects. In class III, the scores were higher than that in class I, II.
3. Abnomality of the sonagram decreased in AT.of class I, II, but in class III, it showed a little improvement
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