| Project/Area Number |
10671924
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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 | Tohoku University |
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Principal Investigator |
SATO Koshi Tohoku Univ., Graduate School of Dentistry, Lecturer, 大学院・歯学研究科, 講師 (10205916)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMODAIRA Hiroshi Japan Advanced Institute of Science and Technology, School of Information Science, Associate Professor, 情報科学研究科, 助教授 (30206239)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Cervical Vertebrae / Maturity Indicator / Mandible / Physiological Age / Pattern Matching / Growth Prediction / 頸椎 |
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| Research Abstract |
The purpose of this study was to establish a "cervical vertebrae bone age" (VA) as maturity indicator and design a formula to predict mandibular growth using VA.
First, using 200 cephalometric radiographs for females between 7 and 15 years of age, the eight parameters on third and forth cervical vertebrae of cephalometric radiographs were measured. Multiple regression formula was used to calculate VA by using the proportional measurements of these parameters. The formula was as follows : VA=0.80+6.05×3^<rd> vertebral anterior height (AH)/antero-posterior length (AP)+9.63×4^<th> vertebral AH/AP
Next, by using another set of materials (66 females between 8 and 13 years of age), the reliability of this formula was estimated. Correlation coefficient between VA and bone age (Tanner-Whitehouse 2 method) using hand wrist X-ray films was higher than the correlation between VA and chronological age. Difference of these correlation coefficients was significant (p<0.05). VA was found to be useful as physiological age indication.
Third, prediction of mandibular growth was examined. The mandibular length (Cd-Gn) of 21 females were measured on both initial examination (7-12 years of age) and last examination (over 17 years), and VA was calculated on initial examination. The formula was as follows : Growth potential of the mandible=-2.63+36.85×VA
Lastly, automatic estimation of skeletal age based on hand-wrist radiographs was examined as the preliminary study. The pattern matching method was applied. It was confirmed that this method could be applied to VA.
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