1994 Fiscal Year Final Research Report Summary
THE INFLUENCE OF FOOD HARDNESS ON TEMPOROMANDDIBULAR JOINT AREAS OF THE RAT AFTER THE LATERAL MANDIBULAR DISPLACEMENT.
| Project/Area Number |
05454562
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | FUKUOKA DENTAL COLLEGE |
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Principal Investigator |
MATSUMOTO Mitsunari FUKUOKA DENTAL COLLEGE DENTISTRY,PROFESSOR & CHAIRMAN, 歯学部, 教授 (00084294)
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| Co-Investigator(Kenkyū-buntansha) |
KIYOSUE Seigo FUKUOKA DENTAL COLLEGE DENTISTRY,ASSISTANT PROFESSOR, 歯学部, 助手 (60225092)
YANABU Masuyoshi FUKUOKA DENTAL COLLEGE DENTISTRY,ASSISTANT PROFESSOR, 歯学部, 助手 (50230280)
KAWAI Satoru FUKUOKA DENTAL COLLEGE DENTISTRY,ASSISTANT PROFESSOR, 歯学部, 助手 (70214583)
HIROSE Takehisa FUKUOKA DENTAL COLLEGE DENTISTRY,ASSISTANT PROFESSOR, 歯学部, 講師 (90218842)
ITOH Takami FUKUOKA DENTAL COLLEGE DENTISTRY,ASSOCIATE PROFESSOR, 歯学部, 助教授 (90122770)
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| Project Period (FY) |
1993 – 1994
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| Keywords | HARDNESS OF FOOD / MANDIBLE / LATERAL DISPLACEMENT / TEMPOROMANDIBULAR JOINT / HISTOPATHOLOGY / MORPHOLOGY / RAT |
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| Research Abstract |
Experiment was carried out to study how solid, paste, and liquid diet qrowing Rats would influence the temporomandibular joint. Furthermore, jumping plate was placed in the right molar side of the Rats fed with different food hardness to study how the temporomandibular joint is altered. Three weeks old male rats (SD type) were divided into three groups (hard, soft, liquid diet) and they were fed for seven weeks. Furthermore, jumping plates were set in the rats raised and fed similarly, and comparisons were studied. Theresults were : 1) as for thecondylar disc, clear atrophy of the fibrous connective tissue and the nuclei of the fibrous cells were more prominent in the paste and liquid groups than the solid food group. The inflammatory response of the fibrous connective tissue, as the result of the ipsilateral mandibular displacement, was confirmed to be the most prominent in the liquid food group. 2) in the condylar cartilage, squamous and atrophy of the hypertrophic cartilage cells, i
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n conjunction with the mandibular deviation was noted. In the liquid food group, prominent hindrance of the hypertorophic cartilage cells turning into mature cartilage cells was noted. As a result, it is shown that soft diet causes reqressive changes of the temporomandibular joint cells, making it more susceptible to the influence of external force caused by the mandibular displacement. Also, it was noted that the jaw movement influenced the morphologic changes in the maxilla and mandible. Thus, temporomandibular joint alterations were examined in the rats fed with different diet and placing jumping plate in the upper right molar region. Masticatory exercise was carried out in the automaatic mandibular movement analyzer machine developed by us. The machine was set to force open and close movement for 20 minutes (300 times/minute) for one week. The results were : 1) in the maxilla, comparison of the normal versus experiment groups for the angle measurement showed showed prominent right deviation in the mid-incisal region. 2) in the mandible of the experiment group, prominent difference in left versus right distance measurements Kd-dg, Kd-id, Kd-an, Kd-PM were noted. Based on the above findings, jaws and temporomandibular joint can be obtained in short period by forcing open and close movement. Furthermore, it was confirmed that the condition is amplified as the diet gets softer. Less
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