Three-year clinical outcomes of additively manufactured hybrid composite implant-supported restorations fabricated through tilting stereolithography: a retrospective clinical study.

OBJECTIVES

To evaluate the 3-year clinical performance of additively manufactured (AM) hybrid composite short-span implant-supported restorations fabricated through tilting stereolithography (TSLA) within a fully digital workflow.

METHODS

This retrospective clinical study included 218 patients rehabilitated with 278 implant-supported restorations fabricated from a ceramic-filled hybrid composite material using TSLA technology. The restorations comprised 207 single crowns (SCs) and 71 fixed partial dentures (FPDs), supported by 360 implants. All rehabilitations were produced through a complete digital workflow. Primary outcomes included marginal adaptation, occlusal and interproximal contact quality, and chromatic integration, assessed at delivery by two independent evaluators using a 5-point scoring system. Secondary outcomes included restoration survival and restoration success during follow-up. Kaplan-Meier survival analysis was performed.

RESULTS

At delivery, both evaluators assigned predominantly excellent or satisfactory scores for marginal adaptation, occlusal contacts, interproximal contacts and chromatic integration, with no significant differences between restoration types (p > 0.05). During follow-up, 3 biological complications (1.1%) and 19 prosthetic complications (6.8%) were recorded, including 7 cases of abutment screw loosening, 6 decementations and 6 restoration fractures. Two implants failed during early healing, while three patients were lost to follow-up during the third year. Kaplan-Meier analysis revealed a cumulative restoration survival rate of 97.8% and an overall restoration success rate of 92.0% after 3 years.

CONCLUSIONS

Within the limitations of this short-term study, TSLA-manufactured hybrid composite restorations demonstrated favourable clinical accuracy, high survival rates and acceptable short-term clinical performance.

CLINICAL RELEVANCE: Hybrid composite restorations fabricated through TSLA may represent a promising option for definitive short-span implant-supported rehabilitations within contemporary digital prosthodontic workflows.