2001 Fiscal Year Final Research Report Summary
The retainer design of rigidly supported clasp dentures
| Project/Area Number |
12671870
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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 |
補綴理工系歯学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
MIURA Yoshifumi Hokkaido Univ., Grad. School of Dental Medicine, Inst., 大学院・歯学研究科, 助手 (50229647)
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| Co-Investigator(Kenkyū-buntansha) |
KAWASAKI Takao Hokkaido Univ., Grad. School of Dental Medicine, Prof., 大学院・歯学研究科, 教授 (90002229)
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| Project Period (FY) |
2000 – 2001
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| Keywords | removable partial dentur / clasp denture / rest / denture displacement / stress distribution / denture design |
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| Research Abstract |
Purpose: The purpose of this study was to examine the effect of the rest positions of direct retainers of the R-clasp (a clasp with a distal proximal plate and a lingual enlarged bracing arm) dentures and splinting of abutment teeth. Material and Methods: A mandibular simulation model of unilateral free-end missing teeth (7651MT) was used in this study. One ordinary clasp (Aker's clasp) and three types of R-clasps (mesial, distal, mesial and distal rests) were designed as direct retainers. When static vertical loading was applied, the stress distribution of the first premolar and the displacement of the denture base, the major connector and the first premolar were measured. Results: The distal proximal plate and the lingual enlarged bracing arm diminished the movement of the denture base. The distal rest decreased the sinking movement of the distal part of the denture base and increased the compressive stress in the apex of the first premolar. The mesial rest decreased the distal inclination of the first premolar. The distolingual movement of the denture base was less and the inclination of the first premolar decreased when the abutment was splinted. Conclusion: Our results suggest that the bilateral design with a distal proximal plate and a lingual enlarged bracing arm and mesial and distal rests of are effective. In addition, abutment teeth should be splinted if possible.
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