Implant failure: Regional versus cumulative evaluation

In this paper the success rate of implant therapy in various bone regions i s discussed. The objective is to determine whether differences existed in s uccess rates of cylinder implants placed in different areas in the both max illa and mandible. Forty four patients have been treated and reviewed five years after the placement of the fixed prosthetic restoration. The patients were provided with a total of 92 implants. Results from this study show ve ry low survival rate for implants placed in anterior region of maxilla (55. 6%) after five years. It is concluded that simple cumulative follow up stud ies do not entirely correspond to actual situations, positioning the implan ts has an important role in the planning of the implant therapy and that im portant factor for force compensation is not only the surrounding bone dens ity, but also the region of the jaw where the implants are placed.