Article:

One method to measure the success of dental implant treatment is to evaluate marginal peri-implant bone-level changes and stability over time. The location of the fixture–abutment interface (FAI) can be of major importance when the goal is to construct esthetic restorations. In these situations the FAI is often placed in a more apical position to create an ideal emergence profile for the prosthetic construction. However, several animal studies have reported that placement of the FAI in a subcrestal position may result in peri-implant marginal bone loss. The aim of the present study is to evaluate the effect of bone grafting of the defect between the bone crest and the coronal aspect of the implant for implants with reduced abutment diameters placed non-submerged and in subcrestal positions.