EFFECT OF TIN COATING OF ABUTMENT SCREW ON DETORQUE FORCE
김희중, 정재헌, 최한철,
소속 상세정보
김희중 ( Kim Hee-Jung ) - 조선대학교 치과대학 치과보철학교실
정재헌 ( Chung Chae-Heon ) - 조선대학교 치과대학 치과보철학교실
최한철 ( Choe Han-Cheol ) - 조선대학교 치과대학 치과보철학교실
KMID : 0362420070450030329
Abstract
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. Discussion. 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.
키워드
Abutment screw;TiN coating;Detorque force;Screw loosening
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