Comparative three-dimensional analysis of two finite-element endosseous implant designs.

The finite-element method was used to assess force distribution to the cortical and cancellous bone surrounding two HA-coated, cylindrical implant designs, one grooved, the other smooth-sided. It was shown that, with both designs, large compressional stresses occurred in a small volume of bone at the coronal portion of the mandibular ridge. The stresses produced gave rise to a large stress gradient in the interface area. Significant differences were noted between the two designs in this area. It was also noted that the majority of the loading occurred in the cortical region of the mandibular ridge.