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    Research Poster

    (P15) Survival and Marginal Bone Loss of Implants Placed in Sites of Previously Failed Implants: A Retrospective Study

    Purpose of the Study: Implant survival refers to the continued presence of a dental implant in the oral cavity. Despite the high rates of reported long-term implant survival, implant failure is still a possibility. Following failure and removal, implant replacement may be the only treatment that allows fixed rehabilitation and restoration of occlusal stability, masticatory efficiency, and overall esthetics. This study aims to examine the survival of dental implants placed in previously early and late implant-failed sites by comparing the early marginal bone loss of surviving and restored implants placed at previously failed sites to that of implants initially integrated and restored within the same subjects. Furthermore, it aims to explore the possible subject and implant level-related factors that might affect the survival and early MBL of the replacement implants.

    Methods: This study is a retrospective study analyzing the survival rate and marginal bone loss of implants placed in previously early and late failed sites in the Department of Periodontology at Tufts University School of Dental Medicine from January 1, 2014, to January 1, 2024. Survival Criteria was defined as simple implant present or absent. The survival rate of replacement implants was determined using Axium records and radiographs. MBL was measured on radiographs of implants placed in previously early and late implant-failed sites. In addition to that, early MBL of surviving and restored implants placed at previously failed sites was compared to that of implants initially integrated and restored within the same subjects.

    Results: A total of 183 replacement implants were analyzed, with a survival rate of 90.16% over a mean follow-up period of 30.81 ± 27.70 months and a mean time to implant failure of 21.66 ± 27.81 months with 9 of the 18 failures occurring within six months. Radiographs one-year post-placement were available for 31 replacement implants with a mean MBL of 1.68 ± 0.98 mm at the deepest site, and 54.8% of sites with more than 2 mm of MBL. There was no significant difference in mean MBL between implants replaced following early versus late failures (p = 0.786) nor in the percentage of sites with more than 2 mm of bone loss (55.0% vs. 54.5%, p = 0.981). In 19 subjects with both replacement and initial implants, no significant difference in MBL was found (1.70 ± 0.83 mm and 1.81 ± 0.98 mm, respectively, p = 0.657) between initially placed or replaced implants.

    Conclusion: The survival rate of implants placed in previously failed sites was 90.16%, comparable to rates reported for initial implants. Most implant failures occurred within six months of replacement. These findings suggest implants in previously failed sites can achieve survival rates equivalent to initially placed implants.

    Articles: Staedt, H., Rossa, M., Lehmann, K.M. et al. Potential risk factors for early and late dental implant failure: a retrospective clinical study on 9080 implants. Int J Implant Dent 6, 81 (2020). https://doi.org/10.1186/s40729-020-00276-w
    Karcı B, Öncü E, Dogan M. The Effect of Different Dental Implant Surface Characteristics on Bone Immunologic Biomarkers and Microbiologic Parameters: A Randomized Clinical Study. Int J Periodontics Restorative Dent. 2021 Jul-Aug;41(4):589-597. doi: 10.11607/prd.4448. PMID: 34328481.
    Kim CM, Lee JB, Um HS, Lee JK. Risk factors for the failure of re-implanted dental implants: A 20-year retrospective study. J Periodontol. 2025;96:140–150. https://doi.org/10.1002/JPER.24- 0198
    Zhou W, Wang F, Monje A, Elnayef B, Huang W, Wu Y. Feasi- bility of dental implant replacement in failed sites: a systematic review. Int J Oral Maxillofac Implants. 2016;31(3):535-545. doi:10. 11607/jomi.4312
    Adell R, Lekholm U, Rockler B, Brånemark PI. A 15-year study of osseointegrated implants in the treatment of the edentu- lous jaw. Int J Oral Surg. 1981;10(6):387-416. doi:10.1016/s0300- 9785(81)80077- 4
    Oh SL, Shiau HJ, Reynolds MA. Survival of dental implants at sites after implant failure: A systematic review. J Prosthet Dent. 2020 Jan;123(1):54-60. doi: 10.1016/j.prosdent.2018.11.007. Epub 2019 Apr 23. PMID: 31027959.
    Chrcanovic BR, Kisch J, Albrektsson T, Wennerberg A. Survival of dental implants placed in sites of previously failed implants. Clin Oral Implants Res. 2017 Nov;28(11):1348-1353. doi: 10.1111/clr.12992. Epub 2016 Oct 14. PMID: 27743398.
    Gomes GH, Misawa MYO, Fernandes C, Pannuti CM, Saraiva L, Huynh-Ba G, Villar CC. A systematic review and meta-analysis of the survival rate of implants placed in previously failed sites. Braz Oral Res. 2018;32:e27. doi: 10.1590/1807-3107bor-2018.vol32.0027. Epub 2018 May 3. PMID: 29723338.
    Solderer A, Al-Jazrawi A, Sahrmann P, Jung R, Attin T, Schmidlin PR. Removal of failed dental implants revisited: Questions and answers. Clin Exp Dent Res. 2019;5:712–724. https://doi.org/10.1002/cre2.234
    Quaranta, Alessandro & Cicconetti, Andrea & Battaglia, L. & Piemontese, Matteo & Pompa, Giorgio & Vozza, Iole. (2012). Crestal Bone Remodeling around Platform Switched, Immediately Loaded Implants Placed in Sites of Previous Failures. European Journal of Inflammation. 10. 115-122. 10.1177/1721727X120100S222.

    Books: .