3D printed resin composite posterior fixed dental prosthesis: A prospective clinical trial up to 1 year

Abstract

Abstract Objectives: This clinical trial evaluated the clinical behaviour of 3D printed posterior resin composite fixed dental prosthesis restorations. Materials and Methods: Between 10.10.2020 - 05.08.2022, forty-nine patients aged between 19 and 60 years old (33 females, 16 males) received 68 3D printed resin composite 3-unit posterior fixed dental prosthesis (ELS Even Stronger, Saremco, Switzerland). FDPs were followed up 2 weeks after placement (baseline) by two independent calibrated observers using modified FDI criteria. Results: Fifty-two FDPs completed their 6 months, 23 and 1of the resin composite FDPs their 1 and 2- year follow-up, respectively. Mean observation period was 8.63 months. Failure types were categorized as mechanical and biological ones. At the end of these observation periods, 8 FDPs showed cohesive fractures. Three abutment teeth needed endodontic treatment, 2 periodontal problems. One FDP was rebonded due to retention failure. After one year, 2 FDPs showed surface lusture loss (Score 4), 2 colour mismatch (Score 4), 2-surface staining (Score 4). Based on mechanical failures, survival rate was 86.7% while including the biological complications, this corresponded to 71.6% (Kaplan-Meier). Conclusion: Long-term follow-up of the present cohort will indicate whether the tested material may serve as long-term provisional or even as permanent material for three-unit FDPs. Clinical Relevance: Resin composite with improved properties could be preferred for permanent prosthetic applications rather than temporary approaches with current 3D technology and CAD / CAM applications. Clinical Trial Registration Number: NCT04600297