Effect of Different Materials and Post Curing Protocols on Shade stability and Fracture Resistance of 3D-Printed Permanent Crowns: an in vitro study.

Description :

This in vitro experimental study is designed to evaluate the mechanical and esthetic performance of newly introduced 3D printing materials and systems for the fabrication of permanent single crowns. The primary outcomes measured are fracture resistance (mechanical durability) and shade stability over time (esthetic longevity). The study model will be the first maxillary premolar will be selected and prepared to receive a full-coverage crown restoration fabricated from 3D-printed resin. Phase 1: Shade Stability Different post-curing variables such as machine type, curing time, and light intensity—affect shade stability in a single resin material:Saremco Print CROWNTEC. A thorough evaluation under various post-curing settings will provide insights for standardizing protocols that enhance esthetic durability. Phase 2: Fracture Resistance In this phase, the same material and post-curing variables tested in Phase 1 will be used to fabricate crowns subjected to compressive loading to evaluate their mechanical strength. Given that suboptimal curing can lead to incomplete polymerization and reduced fracture resistance, this phase aims to identify curing parameters that maximize mechanical performance and longevity under functional masticatory loads. Phase 3: Multi-Material Comparison This final phase compares various 3D-printing resins printed with a standardized printer and cured under the optimal conditions identified in Phases 1 & 2. By evaluating both fracture resistance and shade stability across materials, this phase will highlight material specific differences in performance.The inclusion of Sprintray Pro2 USA curing protocol will provide a benchmark against a widely adopted commercial standard.

Titulaire :
HABRE HALLAGE Pascale

Contact USJ :
pascale.habrehallage@usj.edu.lb

Chercheur(s) :
Dr Colette BOUEIZ

Projet présenté au CR, le : 01/11/2025

Projet achevé auprès du CR : 30/09/2028