Clinical Performance of 3D-Printed Resin Versus Milled Monolithic Zirconia in Implant-Supported Single Crowns and Short-Span Fixed Partial Dentures: A Randomized Controlled Clinical Trial

What this Trial Is About

Researchers are evaluating the clinical performance of implant-supported restorations made from 3D-printed permanent resin (CROWNTEC) compared with conventionally milled monolithic zirconia. The study focuses on single crowns and short-span fixed partial dentures in the front lower jaw, where function and appearance are important. This randomized controlled clinical trial aims to provide evidence on whether 3D-printed resin materials are a viable alternative to zirconia in implant prosthodontics. Participants are randomly assigned to two groups: one receiving restorations made with 3D-printed resin using a fully digital workflow including intraoral scanning, CAD design, 3D printing, post-processing, finishing, and polishing; the other group receives zirconia restorations made by CAD-CAM milling followed by sintering, finishing, and polishing. Both types of restorations are delivered as screw-retained or cement-retained prostheses. The study includes follow-up visits at baseline, 3, 6, and 12 months, with extended follow-up planned up to 24 months. During the study, participants will have assessments of restoration survival, technical complications like fracture or screw loosening, biological parameters including plaque index and probing depth, and radiographic evaluations of bone level changes. Patient satisfaction with esthetics, comfort, and chewing function is measured using questionnaires. The main outcome is the survival rate of restorations after 12 months. The study period extends up to two years, with ongoing monitoring to understand the performance and limitations of both materials.

Clinical Performance of 3D-Printed Resin and Zirconia Implant Restorations