The effect of one-time abutment placement on marginal bone levels and peri-implant soft tissues: 3 years results from a prospective randomized clinical trial

摘要

One of the main goals of current implant dentistry is not only to achieve osseointegration, but also to maintain the long-term stability of the soft and hard peri-implant tissues. The manipulation of the implant to abutment interphase components may influence the stability of the surrounding tissues. In experimental studies (1) repeated dis- and reconnection of prosthetic components could compromise the mucosal barrier around implants and resulted in an apical shift of the connective tissue attachment and the underlying bone. Thisexperimental evidence prompted the development of the “one abutment at one-time” protocol consisting on the placement of the definitive restorative abutment at the time of implant surgery. The scientific evidence on its efficacy when applied to implants placed in healed sites is, however, unclear (2,3). Therefore, the aim of this study was to compare the effect of placing the definitive abutment at the time of implant placement versus at a later stage, on the soft and hard tissue changesaround dental implants.