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KMID : 0988720090250010053
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2009 Volume.25 No. 1 p.53 ~ p.59
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Influence of Tungsten Carbide/Carbon Coating on the Preload and Tightening Torque of Implant Abutment Screws
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Shin Hyon-Mo
Jeon Yun-Kyung
Cho Wook
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Abstract
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The purpose of this study was to clarify the clinical efficiency of tungsten carbide/carbon coating on obtaining optimal preload of abutment screw compared with non-coated screw in external-hex implant system. In the present work, rotational value and the compressive force between abutment and fixture of abutment screws without coating and with coating tightened to 30Ncm were measured. Mean compressive force of coated screw was 504.6N. Then uncoated screw was tightened to clamping the abutment and the implant to 504.6N, and the tightening torque value and the rotational value was recorded. The following conclusions were drawn within the limitation of this study. Compressive force of coated screw was higher than that of uncoated screw after tightening at 30Ncm. The tightening torque that was nedeed to clamping the uncoated screw equal to coated screw tightened to 30Ncm was 55.6Ncm. In case of equal compressive force, there was no significant difference in rotation value between coated and uncoated screw.
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KEYWORD
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preload, tightening torque, tungsten carbide/carbon coating
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