A comparison of labial and crestal incisions for the 1-stage placement of IMZ implants: A pilot study

Purpose: The aim of this study was to compare the crestal incision with the labial flap design when inserting a 2-stage implant system in a nonsubmerg ed manner. Patients and Methods: Ten consecutive edentulous patients with a severely r esorbed mandible (Cawood Class V to VI) that resulted in reduced stability and insufficient retention of the lower denture were included. In all patie nts, 2 IMZ implants were inserted in a 1-stage procedure in the mandibular canine regions as part of an implant overdenture treatment. In 5 patients, the labial nap approach was used, and a crestal incision approach was used in the other 5 patients. Standardized evaluations were performed at 2, 6, a nd 12 weeks after implant placement and 12 months after placement of the ne w prosthesis. Results: In the first postoperative weeks, more hyperplasia occurred around the implants inserted by the crestal incision than the labial flap. Howeve r, after 1 year of function, no striking differences between the 2 groups w ere present with regard to the clinical and radiographic parameters. Conclusions: From this pilot study, it was concluded that both the crestal incision and the labial flap approach are reliable procedures for insertion of IMZ implants in a 1-stage procedure. However, because of the smaller ri sk of soft tissue overgrowth, there is a preference for the labial flap app roach. (C) 2000 American Association of Oral and Maxillofacial Surgeons.