| Project/Area Number |
17592142
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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 |
Orthodontic/Pediatric dentistry
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| Research Institution | Kagoshima University |
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Principal Investigator |
SHGETA Koki Kagoshima University, Graduate School of Medical and Dental Sciences, Assistant Professor (10274854)
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| Co-Investigator(Kenkyū-buntansha) |
OKADA Hiroshi Kagoshima University, Graduate School of Science and Engineering, Associate Professor (50281738)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,680,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2005: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | dentistry / temporomandibular joint / biomechanics / simulation / analysis and assessment |
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| Research Abstract |
While relationships between disc disorders and temporomandibular joint morphology in adults have been investigated, few reports have examined morphology of TM disorders in young patients in whom the temporomandibular joint is still growing and developing. We divided subjects into a group with disc disorders (ADD) and a group without articular disc disorders (Normal) and compared horizontal condylar angle (HCA) as assessed by horizontal magnetic resonance imaging (MRI) and frontal condylar angle (FCA) as assessed by frontal MRI. When comparing the mandibular condyles between ADD and normal groups, HCA and FCA were significantly greater for the ADD group. HCA was also significantly higher for patients □15 years old, while FCA was significantly higher for patients <15 years old. These results suggest that disc disorders in young patients exhibit unique morphologies, and disc disorders are likely to occur during the process of mandibular condyle growth and development. Regarding the reason for such morphological changes, leading researchers have pointed out "functions". In other words, when occlusal force is applied to upper and lower dentitions due to mastication and chewing, compressive force is also applied to the temporomandibular joint. This stress not only facilitates temporomandibular joint growth, but also plays an important role in the maintenance of normal function and structure. In the future, we plan to validate the present results and undertake thorough investigations using a three-dimensional finite-element model that has been developed to ascertain the effects of functions on temporomandibular joint growth and development.
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