Peri-implant bone loss clinical and radiographic evaluation around rough neck and microthread implants: a 5-year study

ObjectiveTo evaluate marginal bone loss over 5years around microthreaded implants placed in the maxillary anterior/esthetic zone and immediate restored with non-occlusal loading. Materials and methodsSeventy-one implants (with microthreads up to the platform-rough surface body and neck, internal connection and platform switching) were placed in healed bone in the maxillary arches of 30 men and 23 women (mean age 37.857.09years, range 27-60). All subjects had at least 3mm of soft tissue to allow the establishment of adequate biologic width and to reduce bone resorption. Each patient received a provisional restoration immediately after implant placement with slight occlusal contact. Mesial and distal bone height was evaluated using digital radiography on the day following implant placement (baseline) and after 1, 2, 3, 4 and 5years. Primary stability was measured with resonance frequency analysis. ResultsNo implants failed, resulting in a cumulative survival rate of 100% after 3years. Marginal bone loss from implant collar to bone crest measured at baseline (peri-implant bone defect at the fresh extraction socket) and after 5years was 0.90mm +/- 0.26mm. Mesial and distal site crestal bone loss ranged from 3.42 +/- 1.2mm at baseline to 3.51 +/- 1.5mm after 5years and from 3.38 +/- 0.9mm at baseline to 3.49 +/- 0.9mm after 5years, respectively (P=0.086). ConclusionsThe results of this study showed limited implant crestal bone loss 0.90mm +/- 0.26mm and 100% of implant survival rate at 5-year follow-up of immediate restored implants with rough surface neck and microthreads.