J Korean Acad Prosthodont.
2007 Jun;45(3):329-338.
Effect of TiN coating of abutment screw on detorque force
- Affiliations
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- 1Department of Prosthodontics, College of Dentistry, Chosun University, Korea. jhajung@chosun.ac.kr
- 2Department of Dental materials, College of Dentistry, Chosun University, Korea.
Abstract
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PURPOSE: The aim of this study is to evaluate the effect of TiN coating of abutment screw on the unscrewing torque.
MATERIAL AND METHODS: Titanium and Gold-Tite abutment screws were classified into two groups, Group A and C respectively, as control groups. Titanium abutment screws with TiN coatings were also classified into two groups, Group B and D, as experimental ones. Group A and B were tightened to 20 Ncm input torque, and Group C and D were tightened to 32 Ncm torque. Detorque values were measured with digital torque gauge during repeated closing and opening experiment.
RESULTS
Abutment screws with TiN coating (Group B and D) showed statistically significant higher mean detorque values than those of Group A and C. DISSCUSION: Physical properties of TiN coating, such as low friction coefficient, high hardness and wear resistance, might contribute to higher detorque values.
CONCLUSION
It is suggested that TiN coating of abutment screw help to reduce the risk of screw loosening and improve the stability of screw joint.
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