The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

STRESS ANALYSIS ON THE DIFFERENT CLASPS OF THE REMOVABLE PARTIAL DENTURE BY THREE-DIMENSIONAL FINITE ELEMENT METHOD

삼차원 유한 요소법에 의한 가철성 국소의치 클래스프의 응력 분석

  • Park Hong-Ryul (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Kim Seong-Kyun (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Koak Jai-Young (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Heo Seong-Joo (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Chang Ik-Tae (Department of Prosthodontics, College of Dentistry, Seoul National University)
  • 박홍렬 (서울대학교 치과대학 치과보철학교실) ;
  • 김성균 (서울대학교 치과대학 치과보철학교실) ;
  • 곽재영 (서울대학교 치과대학 치과보철학교실) ;
  • 허성주 (서울대학교 치과대학 치과보철학교실) ;
  • 장익태 (서울대학교 치과대학 치과보철학교실)
  • Published : 2005.04.01
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Abstract

Statement of problem. In the partially edentulous patients, removable partial dentures have been working as a important treatment modality. Clasps, a kind of direct retainers, received some amount of stresses during the insertion and removal of partial denture on the abutment tooth. Purpose. The study is to investigate stresses of the different clasps. Material and methods. In order to investigate the degree of stresses, maxillary partial edentulism (Kennedy Class II modification I) was assumed and removable partial dentures were designed on it with three kinds of metallic materials; cobalt-chromium alloy, type IV gold alloy and commercially pure (c.p.) titanium. Aker's clasp was applied on the left second molar. RPA (mesial rest-proximal plate-Aker's) clasp was on the left first premolar and wrought wire clasp was on the right first premolar. Three dimensional, non-linear, dynamic finite element analysis method was run to solve this process. Results. 1. Cobalt-chromium alloy had the highest von Mises stress value and c.p. titanium had the lowest one irrespective of the types of clasps. 2. In the Aker's clasps, stress on the retentive tips was shown shortly after the appearance of stresses of the middle and minor connector areas. These time lag was much shorter in the RPA clasps than in the Aker's clasp. 3. In general. retentive tips of wrought wire clasps had much less amount of stress than other clasps. Conclusion. The amount of stress was the highest in the RPA clasp and the lowest in the wrought wire clasp, in general.

Keywords

References

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