The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

INFLUENCE OF TUNGSTEN CARBIDE/CARBON COATING ON THE PRELOAD OF IMPLANT ABUTMENT SCREWS

임플랜트 지대주 나사의 텅스텐 카바이드/탄소 코팅이 전하중에 미치는 영향에 관한 연구

  • Choi Jin-Uk (Department of Dentistry, College of Dentistry, Busan National University) ;
  • Jeong Chang-Mo (Department of Dentistry, College of Dentistry, Busan National University) ;
  • Jeon Young-Chan (Department of Dentistry, College of Dentistry, Busan National University) ;
  • Lim Jang-Seop (Department of Dentistry, College of Dentistry, Busan National University) ;
  • Jeong Hee-Chan (Department of Dentistry, College of Dentistry, Busan National University) ;
  • Eom Tae-Gwan (Osstem Implant R&D Center)
  • 최진욱 (부산대학교 치과대학 보철학교실) ;
  • 정창모 (부산대학교 치과대학 보철학교실) ;
  • 전영찬 (부산대학교 치과대학 보철학교실) ;
  • 임장섭 (부산대학교 치과대학 보철학교실) ;
  • 정희찬 (부산대학교 치과대학 보철학교실) ;
  • 엄태관 (오스템 임플랜트 연구소)
  • Published : 2006.04.01
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Abstract

Statement of problem: In order to increase preload with reducing the friction coefficient, abutment screws coated with pure gold and Teflon as dry lubricant coatings have been introduced. But the reported data indicate that if screw repeated tightening and loosening cycle, an efficiency of increasing preload was decreased by screw surface wearing off. Purpose: This study was to evaluate the influence of tungsten carbide/carbon coating, which has superior hardness and frictional wear resistance, on the preload of abutment screws and the stability of coating surface after repeated closures. Material and method: The rotational values of abutment screws and the compressive forces between abutment and fixture were measured in implant systems with three different joint connections, one external butt joint and two internal cones. Moreover the stability and the alteration of coating surface were examined by comparison of the compressive force and the removable torque values during 10 consecutive trials, observation with scanning electron microscope and analyzed the elemental composition with energy dispersive x-ray spectroscopy Results and conclusion: 1. Application of coating resulted in significant increase of compressive force in all implant systems(P<.05). The increasing rate of compressive force by coating in external butt joint was gloater than those in internal cones (P<.05). 2. Coated screw showed the significant additional rotation compared to non-coated screw in all implant systems (P<.05). There were no significant differences in the increasing rate of rotation among implant systems (P>.05). 3. Removable torque values were greater with non-coated screw than that with coated screw (P<.05). 4. Coated screw showed insignificant variations in the compressive forces during 10 consecutive trials(P>.05) 5. After repeated trials, the surface layer of coated screw was maintained relatively well. However surface wearing and irregular titanium fragments were found in non-coated screw.

Keywords

References

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