The aim of this prospective controlled clinical trial is to evaluate the clinical and radiographical outcomes of two implant surfaces inserted in a crest that has been horizontally augmented at least 6 months prior to the implant placement. The horizontal GBR should be done with a xenogenic graft mixed with autologous bone particles, and a collagen membrane stabilized using tacks or screws.

This is a prospective, randomized clinical and radiographical evaluation of bone remodeling around implants with two different surfaces placed in a previously augmented crest. Patients requiring dental implants in previously horizontally augmented bone crest are recruited at the Department of Periodon¬tics, Faculty of dental medicine, Saint-Joseph University, Beirut, and will be treated with either T3 (contemporary hybrid collar), tapered, ex-hex, CP4 or Full Osseotite, tapered, ex-hex, CP4. A total of 30 implants will be placed (15 per group). Random allocation of implant type per site will be done by the sealed envelope method. The implants will be placed using a one-stage surgical approach. A final crown will be placed (screw-retained on multiunit abutment) between 3 and 4 months post-implant placement. The patients will be followed-up at 6 months and 1 year. Only patients meeting inclusion/exclusion criteria and providing a dated and signed informed consent form will be enrolled in the study.