Root-form implants placed in subantral grafted sites.

Life-table analysis of survival data of implants placed in subantral grafts reveals a high rate of survival, particularly in comparison with implants placed in non-grafted subantral sites. However, sample size (158 grafted, 140 non-grafted, in a total of 120 patients) and follow-up time remain insufficient to reach a definite conclusion. Results also appear improved over other reports in which the sinus was penetrated by the implants, possibly because the procedure has become more standard over the years.