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KMID : 0362420070450030329
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Journal of Korean Academy of Prosthodontics
2007 Volume.45 No. 3 p.329 ~ p.338
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EFFECT OF TIN COATING OF ABUTMENT SCREW ON DETORQUE FORCE
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Kim Hee-Jung
Chung Chae-Heon
Choe Han-Cheol
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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. 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.
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KEYWORD
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Abutment screw, TiN coating, Detorque force, Screw loosening
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