Effect of the surface modifications and the use of washer on the reverse torque of the implant prosthetic gold retaining screw
이재혁, 장경수, 김창회, 김영수,
소속 상세정보
이재혁 ( Lee Jae-Hyuck ) - 서울대학교 치과대학 치과보철학교실
장경수 ( Jang Kyung-Soo ) - 서울대학교 치과대학 치과보철학교실
김창회 ( Kim Chang-Whe ) - 서울대학교 치과대학 치과보철학교실
김영수 ( Kim Yung-Soo ) - 서울대학교 치과대학 치과보철학교실
KMID : 0362420020400030246
Abstract
The screw loosening is one of the complications that happen frequently in dental implant prostheses.The purpose of this study was to evaluate the changes of reverse/loosening (opening) torque of the screw according to the surface modifications by sandblasting and 24K gold electroplating as well as to determine the possibility of the clinical use of a washer in dental implant. The reverse torque of 4 experimental conditions(control, sandblasted, use of washers, electroplasted) was measured by digital torque gauge (Model MGT50Z, Mark-10 Corp., 458 West John Street Hicksville,NY 11801 USA). Electronic torque controller (Nobel Biocare DEA 020) was used in fastening the gold screws into abutment replicas. Mixed Linear Model Analysis method was used for statistical analysis. To examine the changes of screw thread surface, microphotographs were taken by Olympus PME-3 metallurgic microscope (Olympus Optical Co. Ltd., Tokyo, Japan).Within the limitations of this study, the following results were drawn:1. The surface modifications of the gold screws and the use of a washer have significantly affected the reverse torque value compared to the control group (p<0.01).2. Sandblasting and electroplating treatments demonstrated significantly higher reverse torque val-ue than that of control group.3. The use of a washer may be one of the useful clinical methods that prevent the screw loosening. However, further studies are necessary for the material selection and design of the washer.
키워드
Implant; Gold Screw; Reverse Torque; Sandblasting; Electroplating; Washer
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