Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
권호 표지

The study on the survival rates and crestal bone changes around the implants

임플란트 주위 골변화와 생존율에 대한 연구

  • Choi, Hyun-Suk (Dept. of Periodontology, College of Dentistry and Dental Science Research Institute, Chonnam National University) ;
  • Chung, Hyun-Ju (Dept. of Periodontology, College of Dentistry and Dental Science Research Institute, Chonnam National University) ;
  • Kim, Ok-Su (Dept. of Periodontology, College of Dentistry and Dental Science Research Institute, Chonnam National University) ;
  • Kim, Young-Jun (Dept. of Periodontology, College of Dentistry and Dental Science Research Institute, Chonnam National University)
  • 최현숙 (전남대학교 치과대학 치주과학교실 및 치의학 연구소) ;
  • 정현주 (전남대학교 치과대학 치주과학교실 및 치의학 연구소) ;
  • 김옥수 (전남대학교 치과대학 치주과학교실 및 치의학 연구소) ;
  • 김영준 (전남대학교 치과대학 치주과학교실 및 치의학 연구소)
  • Published : 2004.06.30
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Abstract

The success and failure of dental implants depends on various factors such as patient's systemic status, quantity and quality of surrounding bone, presence or absence of marginal infection and mechanical loading condition. The measurement of crestal bone changes around the implants is implemental to evaluate the success and long-term prognosis of the implant. This study was to evaluate the cumulative survival rate of the implants which had been placed in the Department of Periodontics, Chonnam National University Hospital between 1992 and 2003, and to observe the crestal bone loss around the implants which had at least 2 consecutive periapical radiographs after connecting the transmucosal abutment. The radiographs were scanned and digitalized, and the crestal bone levels on the mesial and distal surface of implants were measured using Image analyzer (Image Pro Plus, Media Cybernetics, USA), immediately after implant placement, at 2nd surgery, and 3 months, 6 months, 1 year, and every year thereafter. Any bone loss was not observed during the period between the 1stand 2nd surgery, and the bone loss was 0.86 ${\pm}$ 0.92 mm for the first year of loading after connecting the transmucosal abutment. After 1 year of loading, annual bone loss was 0.1 ${\pm}$ 0.27 mm, and total bone loss was 0.90 ${\pm}$ 0.80 mm (during the average follow-up periods of 22.5 ${\pm}$ 25.6 Mos), The implant, with smooth surface, in the mandible, and with the fixed bridge prosthesis showed greater bone loss, compared to those, with the rough surface, in the maxilla and with single crown. In systemically diseased patients (including DM or osteoporosis), the greater bone loss was observed. The cumulative survival rate among 432 implants was 94.10% for 7 years. Among 15 failed implants, 9 implants were removed due to mobility from disintegration of bone-implant interface. From this results, crestal bone loss around the implants were greatest during 1 year after transmucosal abutment connection, and various factors could affect peri-implant bone loss. To prevent and predict the bone loss around the implants and improve the prognosis, further comprehensive maintenance and follow-up schedules are required.

Keywords

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