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Few reports have investigated narrow-diameter implant survival in the molar region. Objective: The aim of this study was to compare the survival rates of narrow and regular-diameter implants in the mandibular molar region. Material and methods: This retrospective cohort study included 638 patients who underwent implant treatment in the mandibular molar region at Osaka Dental University Oral Implantology Department and at six associated dental clinics from late December 2000 through to 2010. We investigated 1059 implants with attached superstructure, for which follow-up data were available in the medical records. Data on cumulative implant survival rates were analyzed in January 2016. In this study, we defined implants with a diameter of 3.5 mm as narrow-diameter implants (ND group) and those with a diameter of 3.75 mm or greater as regulardiameter implants (RD group). To calculate the implant survival rate, the Kaplan–Meier method was used. Results: The cumulative implant survival rate after superstructure placement in the mandibular molar region was 97% in both the RD group and the ND group at 183.0 months. According to the log-rank test, there were no significant differences between the ND and RD groups. Conclusion: Narrow-diameter implants are equally successful in the mandibular molar region as regular-diameter implants. Correspondence to: Korenori Arai, DDSc, Department of Oral Implantology, Osaka Dental University, 8-1, Kuzuha hanazono cho, Hirakata City, Osaka, Japan, Tel: +81-06-6910-1520; Fax: +81-06-6910-1048; E-mail: arai-k@cc.osaka-dent.ac.jp

An examination of the cumulative survival rate of narrow-diameter dental implants in the mandibular molar region: a retrospective cohort study