Two-unit Cantilever Implant Prostheses Made of Monolithic Zirconia or PFM

This study is comparing two types of dental crowns — monolithic zirconia and porcelain-fused-to-metal (PFM) — for use in a two-unit cantilever implant prosthesis (a dental bridge supported by a single implant). Both materials are commonly used in dentistry, but there is limited long-term data comparing how well they perform in cantilever designs, where one crown hangs unsupported over the gap left by a missing tooth. Participants who already have a well-placed dental implant in the back part of the mouth will be fitted with one of the two crown types and followed over time. Dentists will assess function, appearance, and any complications such as fractures or loosening. You may be eligible if... - You are 22 years of age or older - You have a well-placed, osseointegrated implant in the back upper or lower jaw - You have good oral hygiene and healthy gum tissue - You have a two-tooth gap suitable for a cantilever prosthesis - You have opposing teeth to bite against You may NOT be eligible if... - You have severe teeth grinding or clenching habits - You are pregnant or breastfeeding - You smoke more than 15 cigarettes per day - You have poor oral hygiene or an active infection in the mouth - Your cantilever crown would be larger than 10 mm Talk to your doctor to see if this trial is right for you.