Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
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Survival analysis of dental implants in maxillary and mandibular molar regions; A 4$\sim$5 year report

상$\cdot$하악 대구치 부위에 식립된 임플란트의 생존율에 대한 후향적 연구

  • Jang, Jin-Wha (Department of Periodontology, School of Dentistry, Chonnam National University, Gwangju Mir Dental Hospital) ;
  • Ryoo, Gyeong-Ho (Gwangju Mir Dental Hospital) ;
  • Chung, Hyun-Ju (Department of Periodontology, School of Dentistry, Chonnam National University, BK 21 project and Dental Science Research Institute, Chonnam National University)
  • 장진화 (전남대학교 치의학전문대학원 치주과학교실, 광주 미르치과병원) ;
  • 류경호 (광주 미르치과병원) ;
  • 정현주 (전남대학교 치의학전문대학원 치주과학교실, 전남대학교 치의학연구소 및 2단계 BK 21)
  • Published : 2007.06.30
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Abstract

Dental Implants have been proved to be successful prosthetic modality in edentulous patients for 10 years. However, there are few reports on the survival of implant according to location in molar regions. The purpose of this study was to evaluate the $4{\sim}5$ years' cumulative survival rate and the cause of failure of dental implants in different locations for maxillary and mandibular molars. Among the implants placed in molar regions in Gwangju Mir Dental Hospital from Jan. 2001 to Jun. 2002, 473 implants from 166 patients(age range; $26{\sim}75$) were followed and evaluated retrospectively for the causes of failure. We included 417 implants in 126 periodontally compromised patients, 56 implants in 40 periodontal healthy patients, and 205 maxillary and 268 mandibular molar implants. Implant survival rates by various subject factors, surgical factors, fixture factors, and prosthetic factors at each location were compared using Chi-square test and Kaplan-Meier cumulative survival analysis was done for follow-up(FU) periods. The overall failure rate at 5 years was 1O.2%(subject level) and 5.5%(implant level). The overall survival rates of implants during the FU periods were 94.5% with 91.3% in maxillary first molar, 91.1% in maxillary second molar, 99.2% in mandibular first molar and 94,8% in mandibular second molar regions. The survival rates differed significantly between both jaws and among different implant locations(p<0.05), whereas the survival rates of functionally loaded implants were similar in different locations. The survival rates were not different according to gender, age, previous periodontal status, surgery stage, bone graft type, or the prosthetic type. The overall survival rate was low in dental implant of too wide diameter(${\geq}5.75$ mm) and the survival rate was significantly lower for wider implant diameter(p

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