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Implant survival and risk factor analysis in regenerated bone: results from a 5-year retrospective study

  • Hong, Ji-Youn (Department of Periodontology, Periodontal-Implant Clinical Research Institute, School of Dentistry, Kyung Hee University) ;
  • Shin, Eun-Young (Department of Periodontology, Periodontal-Implant Clinical Research Institute, School of Dentistry, Kyung Hee University) ;
  • Herr, Yeek (Department of Periodontology, Periodontal-Implant Clinical Research Institute, School of Dentistry, Kyung Hee University) ;
  • Chung, Jong-Hyuk (Department of Periodontology, Periodontal-Implant Clinical Research Institute, School of Dentistry, Kyung Hee University) ;
  • Lim, Hyun-Chang (Department of Periodontology, Periodontal-Implant Clinical Research Institute, School of Dentistry, Kyung Hee University) ;
  • Shin, Seung-Il (Department of Periodontology, Periodontal-Implant Clinical Research Institute, School of Dentistry, Kyung Hee University)
  • Received : 2020.03.31
  • Accepted : 2020.08.17
  • Published : 2020.12.31

Abstract

Purpose: The aims of this study were to evaluate the 5-year cumulative survival rate (CSR) of implants placed with guided bone regeneration (GBR) compared to implants placed in native bone, and to identify factors contributing to implant failure in regenerated bone. Methods: This retrospective cohort study included 240 patients who had implant placement either with a GBR procedure (regenerated bone group) or with pristine bone (native bone group). Data on demographic features (age, sex, smoking, and medical history), location of the implant, implant-specific features, and grafting procedures and materials were collected. The 5-year CSRs in both groups were estimated using Kaplan-Meier analysis. Risk factors for implant failure were analyzed with a Cox proportional hazards model. Results: In total, 264 implants in the native bone group and 133 implants in the regenerated bone group were analyzed. The 5-year CSRs were 96.4% in the regenerated bone group and 97.5% in the native bone group, which was not a significant difference. The multivariable analysis confirmed that bone status was not an independent risk factor for implant failure. However, smoking significantly increased the failure rate (hazard ratio, 10.7; P=0.002). Conclusions: The 5-year CSR of implants placed in regenerated bone using GBR was comparable to that of implants placed in native bone. Smoking significantly increased the risk of implant failure in both groups.

Keywords

Acknowledgement

This work was supported by a grant from Kyung Hee University in 2017 (KHU-20170845).

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