Dental implants in Melbourne have become a widely accepted treatment for the replacement of single or multiple teeth to restore function and esthetics over the long term.1 Since the development of dental implants, the designs have continuously evolved in order to enhance implant osseointegration, soft and hard tissue compatibility, biomechanical stability, esthetics, and implant survival and success rates. In recent years, implant and prosthetic design have focused on minimizing crestal bone loss (BL) around dental implants.2

At Smile Quest Dentists Melbourne we cater for all sorts of implant designs While dental implants initially had a machined titanium surface, the current standard is a roughened, threaded surface to improve osteoblast compatibility and implant surface area for osseointegration.3–5 Many initial roughened implant designs were designed with a smooth machined collar. In the past, this was thought to prevent microbial plaque accumulation and facilitate plaque and calculus removal in the gingival sulcus area while the roughened implant body improved bone-to-implant contact during healing.6 Early crestal BL has been associated with mucoperiosteal flap reflection, implant position relative to the osseous crest, biomechanical forces, biologic width, and the implant-abutment interface.7 While some authors have suggested that initial crestal BL may be self-limiting . and does not indicate a higher likelihood of developing peri-implantitis over time,2,8 other authors suggest that an increase in early crestal BL may predispose dental implants to a higher incidence of peri-implantitis, particularly when other risk factors for continued BL are present.9 Several studies have demonstrated that roughened surface collars demonstrate superior retention of crestal bone levels when compared to machined collars in both human and animal models.4,10–13 Furthermore, when comparing collars that were randomly roughened, collars roughened with microgrooves, and machined collars, there was significantly less radiographic crestal BL at 1 year for the group with microgroove-roughened collar surfaces.13 These findings suggest that implant designs with fully roughened surfaces may result in superior bone retention during initial healing up to 1 year, which may be important for establishing a healthy environment and avoiding peri-implant bacterial invasion and inflammation.9 While previous studies have compared various surface treatments at the collar to a machined collar,10,12,13 to the authors’ knowledge, no study has compared the efficacy of microtextured (MTX) surface technology in maintaining crestal bone levels (1) around implants with a full MTX treatment and microgrooved collar, and (2) at implants with an MTX treatment and machined collar (Zimmer Biomet Dental manufactured both the test and control implants). This prospective, randomized controlled trial evaluated the maintenance of marginal bone levels around these two types of implants with differing collar designs at 1 year after placement, the effects of collar design on early implant failure, and the impact of clinical experience of the surgeon on implant success and marginal BL.The International Journal of Periodontics & Restorative Dentistry 166 

Dental Implant Design