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Retrospective study on the clinical outcomes of small‐diameter implants supporting fixed prostheses without bone augmentation in the posterior region after 2 to 12 years
Author(s) -
Si Misi,
Zhang Yu,
Li Jiaying,
He Fuming
Publication year - 2019
Publication title -
clinical implant dentistry and related research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.338
H-Index - 85
eISSN - 1708-8208
pISSN - 1523-0899
DOI - 10.1111/cid.12782
Subject(s) - medicine , implant , radiography , dentistry , prosthesis , implant failure , retrospective cohort study , soft tissue , dental prosthesis , surgery
Background Small‐diameter implants (SDIs: diameter <3.5 mm) are often chosen as an alternative to bone augmentation in clinical practice, but the scientific evidence regarding SDI application in the posterior area remains deficient. Purpose To evaluate the clinical and radiographic outcomes of SDIs supporting fixed prostheses without bone augmentation in the posterior region, and to analyze the potential influencing factors related to SDI failures. Materials and Methods Clinical and radiographic data of 243 SDIs in 156 patients were retrospectively assembled after 2 to 12 (mean 4.75) years of follow‐up. Implant and prosthesis failures, mechanical and biological complications, and radiographic marginal bone loss (MBL) were evaluated. The influence of patient/implant characteristics and prosthetic design on SDI failures was investigated. Results Five implants in five patients failed, contributing to 10‐year cumulative survival rates of 97.9% on an implant‐based analysis and 96.8% on a patient‐based analysis. Biological complications and mechanical complications were detected in 22 (9.1%) and 31 (12.8%) of implants, respectively. No implant fracture was detected. Peri‐implant MBL during 10 years was 0.60 ± 0.90 mm on average. The implant type (bone‐level or tissue‐level) was the only factor that significantly influenced SDI failures. Conclusion SDIs supporting fixed prostheses in the posterior region achieved predictable long‐term clinical outcomes. However, tissue‐level titanium SDIs should be avoided where possible.