Additively Manufactured Definitive Crown Resins on Premolar and Molar Teeth: 2-Year Results of a Prospective Clinical Study.

This article focuses on a prospective clinical study evaluating the 12- and 24-month clinical performance of indirect single-tooth restorations—specifically overlays and one-piece endodontic crowns—fabricated using additively manufactured, 3D-printed permanent ceramic-filled resin (PCR). Thirty patients received 33 restorations, which were assessed using modified US Public Health Service (USPHS) criteria at baseline, 12 months, and 24 months. Results showed a 100% survival rate with clinically acceptable outcomes (≥ 99.5% A + B scores) for all criteria except marginal discoloration, which showed a statistically significant increase at 24 months but did not compromise restoration integrity. The study concludes that 3D-printed PCR restorations demonstrate promising mid-term clinical performance, though it recommends further long-term studies with larger samples to confirm these findings.