Methods: A total of 235 Implants placed in 103 patients between January 2008 and December 2010 at the selected dental treatment centers of Tehran, were investigated with the following data collected from the dental records and radiographs: patient's age, gender, location of implant placement , systemic disease, need for bone grafting and periodontal conditions before treatment. Then correlations between these data and survival rate were analyzed by SPSS and Chi-square analysis.
Results: 9 of 235 implants were failed, and implant survival rate was 96.2%. Maximum failure was observed in fifth and sixth decades of life (8 implants). The most frequent cause of implant failure was fibro osseous integration (7 implants). 16% and 49.5% of the patients had systemic disease and periodontitis before treatment respectively; moreover, 33.5% of implants needed bone grafting. A significant correlation between survival rate and need for bone grafting and periodontal conditions was shown (P=0.000); Still, there was no correlation between other demographic factors and survival rate significantly (P<0.05). In addition, there was a significant correlation between age and location of implant placement (P<0.001).
Conclusions: Consequently, it is important to consider demographic factors, such as need for bone grafting and periodontal conditions, before treatment to increase the survival rate of dental implants.