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KMID : 0362220100370040349
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Journal of The Korean Research Society for Dental Materials
2010 Volume.37 No. 4 p.349 ~ p.354
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Surface Morphology of Abutment Screw Surface after Repeated Tightening and Loosening
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Park Chan-Ik
Jeong Yong-Hoon
Choe Han-Cheol
Ko Yeong-Mu
Eun Sang-Won
Chung Chae-Heon
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Abstract
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In this study, to investigate surface morphology of abutment screw surface after repeated loosening and tightening, abutment screws, abutments and fixtures were used respectively for the experiment. Titanium nitride(TiN) and tungsten carbide(WC) film coating were carried out on the abutment screw using electron beam-physical vapor deposition (EB-PVD) and sputtering methods, respectively. In order to observe the coating surface of the abutment screw after loosening/tightening, each coated abutment was secured to the implant fixture by each abutment screw with recommended torque value using a digital torque controller and was repeatedly delivered and removed by 1 time and 20 times, respectively. The surfaces of specimens were observed by field emission scanning electron microscope(FE-SEM) and energy dispersive x-ray spectroscopy(EDS) at the abutment screw. In the case of TiN and WC coated abutment surface, scratch formed by machine was improved and decreased. After 20 times of loosening/tightening, the abutment screw surface showed debris like TiN and WC particles. The surface morphology of the abutment screw after tightening and loosening depends on coating materials such as TiN and WC film.
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KEYWORD
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Implant system, Abutment screw, EB-PVD, TiN and WC coating
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