1997 Fiscal Year Final Research Report Summary
The development of the optimum occlusal morphology occlusal facets in harmony with jaw movement and the clinical application
| Project/Area Number |
07457472
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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 | The University of Tokushima |
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Principal Investigator |
NAKANO Masanori The University of Tokushima, School of Dntistry, Associate Professor, 歯学部, 助教授 (30136262)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUURA Hirooki The University of Tokushima, University Dental Hospital, Research Associate, 歯学部・附属病院, 助手 (10271082)
KORI Yukiko The University of Tokushima, University Dental Hospital, Assistant Professor, 歯学部・附属病院, 講師 (70243722)
KORI Motoharu The University of Tokushima, School of Dentistry, Research Associate, 歯学部, 助手 (50253216)
SUZUKI Atsushi The University of Tokushima, School of Dentistry, Research Associate, 歯学部, 助手 (80196790)
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| Project Period (FY) |
1995 – 1997
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| Keywords | Occlusal reference surface / Occlusal facet / Jaw movement / M and D value / M and D type guidance |
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| Research Abstract |
The purpose of this study was to determine the optimum morphology of occlusal facets from the view point of harmony with jaw movements. Results were as follows.
1. Occlusal reference surfaces, proposed by Mima, were applicable not only single path but also multiple pathes of jaw movements.
2. Four types of occlusal reference surfaces were defined by using the trajectories of lateral, retrusive and protrusive sliding movements. The harmonious occlusal facets with these occlusal reference surfaces produced no considerable interference with jaw movement during the forth and fifth phases of the chewing cycle.
3. We proposed to evaluate occlusal facets quantitatively by using inclination angle and M (D) value corresponding with azimuth angle. This evaluating method was significant in comparison of occlusal reference surfaces to occlusal facets of subjects.
4. Lateral excurisions were measured by using a jaw tracking device (MM-JI) with experimental M type and D type lateral tooth guidances on canine teeth. D type lateral tooth guidance led more posterior path way of working condylar point than M type lateral tooth guidance. This suggested that D type guidance may cause overload in temporomandibular joint.
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