Cumulative survival rate and complication rates of single-tooth implant; focused on the coronal fracture of fixture in the internal connection implant

This retrospective study evaluated the 5-year cumulative survival rate and complication rates of a 4.0-mm internal connection implant (MicroThread (TM) Osseospeed (TM), Astra Tech) installed for single-tooth restoration. The patients who were treated at Asan Medical Center between 2006 and 2007 were included in this study. A life table analysis was used to calculate the 5-year cumulative survival rate. Comparisons of cumulative survival rates among implant position (anterior, premolar and molar), jawbone (maxilla, mandible), gender and prosthesis type (screw-retained, cement-retained) were performed using the log-rank test. Post-loading complications were analysed using Fisher's exact test. Twelve of 136 implants (anterior; 22, premolar; 25, molar; 89) were lost during the loading period, and 11 were removed due to coronal fracture of fixture. The 5-year cumulative survival rate of the whole arch was 91.9%, and that of the molar region was 87.6%. Statistically significant differences were observed in cumulative survival rates among implant position (P = 0.037), whereas no statistically significant differences were observed among gender, jawbone, prosthesis type. Forty-seven of 114 (41.2%) implants in the posterior region showed post-loading complications, including coronal fracture of fixture and abutment screw loosening.