1999 Fiscal Year Final Research Report Summary
Study on occlusal relationship as a casual factor of temporomandibular disorders
| Project/Area Number |
10470414
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
AKISHIGE Satoshi Tokyo Medical and Dental University, The 1st Department of Prosthodontics, Assistant Professor, 歯学部, 助手 (30272602)
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| Co-Investigator(Kenkyū-buntansha) |
BABA Kazuyoshi Tokyo Medical and Dental University, The 1st Department of Prosthodontics, Assistant Professor, 歯学部, 助手 (80251536)
OKABE Yoshihiro Tokyo Medical and Dental University, The 1st Department of Prosthodontics,, 歯学部, 講師 (30194385)
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| Project Period (FY) |
1998 – 1999
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| Keywords | EMG / Occlusion / Balancing-side interference / Balancing-side contact / TMD / TMJ / Joint Loading / Mandibular displacement |
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| Research Abstract |
This study investigated mandibular displacements and masticatory muscle activity during clenching in the lateral mandibular position in related to lateral occlusal relationships. A dominant canine guidance (CR), working-side interference (WI) balancing-side interference (BI), and bilateral balanced occlusion (BC) were simulated on twelve healthy human subjects. Mandibular displacements and masticatory muscle activity were recorded during submaximal clenching in the right lateral position.
The 4 experimental occlusal conditions were revealed to have a significant effect on both EMG and mandibular displacement patterns (ANOVA,p<0.001). Both CR and WI caused a mandibular displacement pattern, which suggests a larger joint loading on the balancing-side. Contrary, BI induced displacement pattern was suggestive of a larger joint loading on the working-side. BC caused the smallest upward displacement among the 4 experimental conditions. In regard with EMG, clenching on natural canine induced an activity pattern with a clear dominance of the anterior and posterior temporalis muscles on the working-side. The most consistent and obvious change in EMG activity was induced by BI, which decreased the working-side dominance in the anterior and posterior temporalis.
These results suggest that BI has significant effects on temporalis muscle activity and the nature of reaction forces at the temporomandibular.
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