Relation between 3-D morphology of dental arch and jaw function.
| Project/Area Number |
10671942
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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 | Kagoshima University Dental School (1999)
宮崎医科大学 (1998) |
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Principal Investigator |
NAGATA Junko Dental School, Research Associate, 歯学部, 助手 (50264429)
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| Co-Investigator(Kenkyū-buntansha) |
KUROE Kazuto Dental Hospital, Assist.Professor, 歯学部・附属病院, 講師 (00153396)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | jaw movement / jaw muscle activity / dental arch / jaw function / chewing habit / 顎運動機能 / 三次元的形状 / 顎運動パターン / 筋活動 |
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| Research Abstract |
Purpose
The purpose of this study is to clarify the characteristics of three-dimensional morphology of dental arch and jaw function in humans from infancy to adulthood, and how the relation between them develops.
Subjects and Methods
The subjects selected in this study were divided into five developmental groups : group K at kindergarten ; group E at elementary school ; stage J at junior high school ; group H at high school ; group U at university. Each stage included 8 subjects. Jaw movement at incisal teeth, jaw muscles' activities, relation between both of them, and the three-dimensional measurements of dental arch were analyzed.
Results
1. The shape of jaw movement was vertical line at group K and like a tear drop in other groups.
2. Jaw closing muscles' activities were significantly larger in group K.
3. Jaw closing muscles were activated before the start of jaw closing in group K and after in other groups, and those onsets were significantly longer in group U.Jaw opening muscle as activated before the start of jaw opening at all groups, and its onset was significantly longer in groups K and P.
4. Larger longer diameter of dental arch and smaller width of alveolar bone in group K, and larger palatal inclination in groups K and P were significantly shown. The palatal depth increased with age.
5. In the subjects with unilateral chewing habit, the upper and lower dental arches less overlapped.
Discussion
Jaw function in group K seemed to be underdeveloped. At stage P, developed jaw movement was shown like as in groups J, H and U, however, relations between jaw movement and muscles' activities seemed to be underdeveloped. Especially in the subjects with unilateral chewing habit, it was suggested that jaw function closely related to the morphology of dental arch.
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Report
(3 results)
Research Products
(5 results)
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[Publications] Ito, G., Ikeda, K., Nakamura, K.: "Facial patterns and jaw movement."Ito, G., Nakamura, K., Orthodontic Year Book '99, Quintessence, Tokyo. 161-167 (1999)
Description
「研究成果報告書概要(欧文)」より
Related Report
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