Evaluate the clinical outcome of new tapered design implants installed in maxillary posterior areas.
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Completely edentulous patients, aged 18 years or older, presenting with severely atrophic mandibles (Class VI according to Cawood and Howell) were enrolled and treated using four implants, a CAD/CAM titanium bar and a low-profile attachment system to support an implant-supported overdenture.
Factors affecting marginal bone loss in implants that were placed immediately after extraction were followed up more than 1 year after.