Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
권호 표지

The Study on the Physical Property of Provisional Prosthesis using Modified Temporary Abutment

변형된 임플란트 임시 지대주의 물성에 대한 연구

  • Yang, Byung-Duk (Department of prosthodontics, School of Dentistry and Institude of Oral Biosciences, Chonbuk national Univeraity) ;
  • Yoon, Tae-Ho (Department of prosthodontics, School of Dentistry and Institude of Oral Biosciences, Chonbuk national Univeraity) ;
  • Choi, Un-Jae (Department of Dental Laboratory Technology, Wonkwang Health Science College) ;
  • Park, Ju-Mi (Department of prosthodontics, School of Dentistry and Institude of Oral Biosciences, Chonbuk national Univeraity)
  • 양병덕 (전북대학교 치과대학 보철학교실 및 구강생체과학연구소) ;
  • 윤태호 (전북대학교 치과대학 보철학교실 및 구강생체과학연구소) ;
  • 최운재 (원광대학교 치기공과 및 구강생체과학연구소) ;
  • 박주미 (전북대학교 치과대학 보철학교실 및 구강생체과학연구소)
  • Published : 2006.12.30
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Abstract

Statement of problem: Damping of the peak force transmitted to implants has been reported by in vitro studies using impact forces on resin-veneered superstructures. Theoretical assumptions suggest that use of acrylic resin for the occlusal surfaces of a prosthesis would protect the connection between implant and bone. Therefore, the relationship between prosthesis materials and the force transmitted through the implant system also needs to be investigated under conditions that resemble the intraoral mechanical environment. Purpose: The purpose of this study was to analyze the fracture strength and modes of temporary prosthesis when a flange or occlusally extended structure were connected on the top of the abutment. Material and method: Modified abutments of winged and bulk design were made by casting the desired wax pattern which is made on the UCLA type plastic cylinder. Temporary crowns were made using templates on the modified abutments, and its fracture toughness and strain were compared to the traditional temporary prosthesis. To evaluate the effect of aging, 5.000 times of thermocycling were performed, and their result was compared to the 24hours specimen result. Results: The following conclusions were drawn from this study: 1. In the fracture toughness test, temporary crown's fracture line located next to the screw hole while modified designs with metal support showed fracture line on the metal and its propagation along the metal-resin interface. 2. Wing and bulk structure didn't show significant difference in the fracture toughness (p>0.05), but wing structure showed stress concentration on the screw hole area compared to bulk structure which showed even stress distribution. 3. In the fracture toughness test after thermocycling, wing and bulk structure showed increased or similar results in metal supported area while off-metal area and temporary crown showed decreased results. 4. In the strain measurement after thermocycling, its value increased in the temporary and bulk structure. However, wing structure showed decreased value in the loading point while increased value in the screw hole area. Conclusion: Wing type design showed compatible result to the bulk type that its application with composite resin prosthesis to the implant dentistry is considered promising.

Keywords

References

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