| Project/Area Number |
05671723
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
矯正・小児・社会系歯学
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| Research Institution | Showa University |
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Principal Investigator |
SHIBASAKI Yoshinobu Showa Univ., Dentistry, Professor, 歯学部, 教授 (40014005)
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| Co-Investigator(Kenkyū-buntansha) |
MAKI Koutarou Showa Univ., Dentistry, Assistant, 歯学部, 助手 (80219295)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Cordinate Transformation / Vector / Growth and Development / Morphological Change / Mandible / 成長速度ベクトル / 三次スプライン関数 / 評価関数 / セファログラム |
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| Research Abstract |
The dynamics of the maxillofacial bone formation during postnatal growth has a complex process. The growth pattern of the mandible has been assessed by the application of various methods developed for the cephalometric measurement of the skeletal size or positions. However, the lack of information describing the real shapes cannot evaluate the changes of growth sites in lives. In this article, new method for growth analysis was introduced and 25 individuals with longitudinal cephalometric data aged 7-19 years, mean 13 years were evaluated.
New analysis was described following equations :
Fv = SIGMA (abs (Vs-Vh) *D1)
Vs : Growth velocity, Vh : average velocity
D1 : Distance between neighboring two points on same shapes
Gn = SIGMA (abs (S) )
abs (S) : changes of area
H = Fv + Gn
Superposed position was difined where H presented the minimum value. The application of this new method using mathmatical coordinate transformation technique was assessed to quantify and to visualize the mandibular bone remodeling during growth. From the results, this new transformation approach to the study of human growth may provide clinicians with a valuable tool for long ranged treatment planning.
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