The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)
- Volume 36 Issue 5
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- Pages.721-737
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- 1998
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- 0301-2875(pISSN)
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- 2005-3789(eISSN)
STRESS OF DENTAL IMPLANT ABUTMENT SCREW BY THE TIGHTENING TORQUE
조임 회전력에 따른 치과 임플랜트 지대나사의 응력에 관한 연구
- Lee, Won-Joo (Department of Prosthodontics Graduate School Dankook University) ;
- Lim, Ju-Hwan (Department of Prosthodontics Graduate School Dankook University) ;
- Cho, In-Ho (Department of Prosthodontics Graduate School Dankook University)
- Published : 1998.10.01
Abstract
Abutment screw loosening of implant restorations is a common problem in the treatment of dental implant. The purpose of this study was to calculate stress and preload from the elongation measurements and to determine maximum tightening torque without plastic deformation of the screw. The length of each gold alloy UCLA screw was measured after tightening to the manufacturer's recommended torque of 32 N-cm. Similarity, titanium UCLA screws were measured after tightening to the manufacturer's recommended torque of 20 N-cm. Loosening torque was also measured after tightening to 32 N-cm torque for gold alloy abutment screws and 20 N-cm for titanium abutment screws. The results were as follows ; 1. There was a regressive relationship between screw elongation and tightening torque (gold alloy :