| Project/Area Number |
12671982
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
矯正・小児・社会系歯学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
YAMATOMO Takaaki Hokkaido Univ., Grad. School of Dent., Lec., 大学院・歯学研究科, 講師 (40230560)
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| Co-Investigator(Kenkyū-buntansha) |
IFUKUBE Tohru Hokkaido Univ., Research Inst. for Elec. Sci. Prof., 電子科学研究所, 教授 (70002102)
YAMAGATA Shyuichi Hokkaido Univ., Grad. School of Dent., Inst., 大学院・歯学研究科, 助手 (70292034)
IIDA Junichiro Hokkaido Univ., Grad. School of Dent., Prof., 大学院・歯学研究科, 教授 (90151232)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Skeletal malocclusion / Oral disfunction / Tongue movement / Acoustic characteristic |
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| Research Abstract |
We have developed a 3D tongue movement measuring system employing an electromagnetic sensing system that uses five small and lightweight coils. This system was used to measure and compare tongue movements in normal subjects and in skeletal Class III subjects during articuration of five Japanese vowel (/a/, /i/, /u/, /e/ and /o/) sounds. The subject sat in a relaxed posture on a chair, and the subject's head was positioned so that the Frankfurt horizontal plane and floor were approximately parallel. Before commencing the experiment, the subject was given sufficient practice at pronouncing vowel sounds with measurement device in place. The vowel sounds were analyzed using linear predictive coding (LPC), and the frequencies of the first formant (F1) and second formant (F2) of the vowels were calculated. The results were then compared with the results of analysis of tongue movements. The subjects of measuring tongue movement were three normal subjects (3 males) and three skeletal Class III subjects (3 females). And the subjects of analysing vowel sound were 17 skeletal Class III patients (5 males, 12 females) and 13 normal subjects (8 males, 5 females).
The results were as followes.
1) The frequency of the second formant of /u/ in the skeletal Class III patients was significantly (P<0.01) higher than that in the normal subjects.
2) The skeletal class III patients showed compensatory tongue movements to make articulation points by using the rear part of the tongue instead of moving the tongue backward when uttering the closed vowels(/i/,/u/).
3) This compensatory tongue movement was effective for uttering /i/ but not for uttering /u/.
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