Influence of Printing Layer Thickness on the Color Stability of a 3D-Printed Hybrid Resin Material: An In Vitro Study

Description :

Among the various printing parameters, layer thickness plays a pivotal role in determining major properties of printed materials. Despite growing interest in this area, existing literature presents limited and sometimes contradictory findings regarding the influence of printing layer thickness on the color stability of permanent hybrid resin materials. The present study aims to evaluate the effect of different printing layer thicknesses (30 µm, 50 µm, and 100 µm) on the color stability of a 3D-printed hybrid resin designed for definitive restorations. Standardized resin specimens will be fabricated using controlled printing parameters. Following post-polymerization, samples will be immersed in coffee, a commonly used staining medium, for 30 days to simulate extrinsic discoloration challenges encountered in clinical settings. Color measurements will be recorded at baseline and after 7 days, 15 days and 30 days of immersion using a colorimeter device in order to calculate color differences (ΔE values). The collected data will be statistically analyzed using appropriate statistical tests. This in vitro experimental study seeks to clarify conflicting evidence and provide evidence-based recommendations for optimizing printing protocols to improve long-term esthetic outcomes.

Titulaire :
CORBANI Karim

Contact USJ :
karim.corbani@usj.edu.lb

Chercheur(s) :
Dr Karim CORBANI
Dr Louis HARDAN
Dr Cynthia KASSIS (EL) KHOURY (EL)
M. Carlos KHAIRALLAH
Dr Nicole HARRAK
Dr Gaelle Salameh

Projet présenté au CR, le : 01/02/2026

Projet achevé auprès du CR : 01/06/2026