Anterior single implants with different neck designs: 5 Year results of a randomized clinical trial

Background The design of the implant neck might be significant for preservation of marginal bone. Purpose To compare the 5‐year radiographic and clinical outcome of single anterior implants provided with a smooth neck, a rough neck or a scalloped rough neck. Materials and Methods 93 Patients with a missing anterior tooth in the maxilla were included. At random, patients received an implant with a 1.5 mm smooth neck (“smooth group”), a rough neck with grooves (“rough group”) or a scalloped rough neck with grooves (“scalloped group”). Implants were installed in healed sites. Follow‐up visits were conducted after final crown delivery and 1 year and 5 years later. Results Scalloped implants showed significantly more initial marginal bone resorption. The total amount of bone loss was 1.26 ± 0.90 mm in the smooth group, 1.20 ± 1.1 mm in the rough group and 2.28 ± 0.97 mm in the scalloped group (P