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Influence of bearing surface angle of abutment screw on mechanical stability of joint in the conical seal design implant system

내부 원추형 연결형태 임플란트에서 지대주 나사머리의 좌면각도가 연결부 기계적 안정성에 미치는 영향

  • Kim, Joo-Hyeun (Department of Prosthodontics, School of Dentistry, Pusan National University) ;
  • Huh, Jung-Bo (Department of Prosthodontics, School of Dentistry, Pusan National University) ;
  • Yun, Mi-Jung (Department of Prosthodontics, School of Dentistry, Pusan National University) ;
  • Kang, Eun-Sook (Department of Prosthodontics, In-Je University Haeundae Paik Hospital) ;
  • Heo, Jae-Chan (Osstem Implant Research Center) ;
  • Jeong, Chang-Mo (Department of Prosthodontics, School of Dentistry, Pusan National University)
  • 김주현 (부산대학교 치의학전문대학원 치과보철학교실) ;
  • 허중보 (부산대학교 치의학전문대학원 치과보철학교실) ;
  • 윤미정 (부산대학교 치의학전문대학원 치과보철학교실) ;
  • 강은숙 (인제대학교 해운대백병원 보철과) ;
  • 허재찬 (오스템 임플란트 연구소) ;
  • 정창모 (부산대학교 치의학전문대학원 치과보철학교실)
  • Received : 2014.06.27
  • Accepted : 2014.08.10
  • Published : 2014.09.30

Abstract

This study is to evaluate how different bearing surface angles of abutment screw affect the mechanical stability of the joint in the conical seal design implant system. Materials and Methods: Internal connection type regular implants, two-piece cemented type abutments and tungsten carbide/carbon-coated titanium alloy abutment screws were selected. Titanium alloy screws with conical ($45^{\circ}$) and flat ($90^{\circ}$) head designs which fit on to abutment were fabricated. The abutments were tightened to implants with 30 Ncm by digital torque gauge. The loading was applied once to the central axis of abutment. The mean axial displacement was measured using micrometer before and after the tightening and loading (n = 5). The abutment was tightened to implants with 30 Ncm and T-shape stainless steel crown was cemented. Then the change in the amount of reverse-torque was measured after the repeated loading to the central axis, and the place 5 mm away from the central axis. Compressive bending and fatigue strength were measured at the place 5 mm away from the central axis (n = 5). Results: Both groups showed the largest axial displacement when abutment screw tightening and total displacement was greater in the flat head group compared to conical head group (P < 0.05). However, there were no significant differences in reverse torque value, compressive bending and fatigue strength (P > 0.05). Conclusion: Within the limitations of this study, the abutment screw head design had no effect on two groups regarding the joint stability, however the conical head design affected the settlement of abutment resulting in the reduced total displacement.

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