Effect of 3D Printing Technology and Preparation Design on the Marginal and Internal Fit of Overlay Restorations: An In Vitro Study

Description :

The marginal and internal fit of 3D-printed overlay restorations made with three different preparation designs and two distinct 3D printing machines are assessed in this study. Understanding how printer selection and tooth preparation affect restoration fit is essential for clinical success as 3D printing becomes more popular in prosthodontics. The study will measure fit accuracy and identify the best printing technology and preparatory design combination using triple scanning and superimposition techniques.In order to maintain consistent 50μm cement spaces and marginal gap settings throughout all specimens, the digital workflow will make use of Helios 500 (Design of future, DOC, Inc., Seoul, South Korea) intraoral scanning ensuring accurate, efficient, and fully compatible with CAD/CAM workflows, making it an ideal choice for both clinical and research applications in restorative dentistry and along with exocad DentalCAD design software (v3.1 Valetta; exocad GmbH, Darmstadt, Germany). Standardised post-processing procedures for printed overlays will include Ultraviolet (UV) curing, isopropanol cleaning, and support removal. Utilising the triple-scan methodology and Medit crown Fit software (v1.2.0,42, Medit Corp, Seoul, South Korea), fit evaluation will measure internal adaptation using 3D deviation analysis and marginal discrepancies along the whole tooth-restoration interface.

Titulaire :
KASSIS (EL) KHOURY (EL) Cynthia

Contact USJ :
cynthia.kassis@usj.edu.lb

Chercheur(s) :
Dr Cynthia KASSIS (EL) KHOURY (EL)

Projet présenté au CR, le : 21/10/2025

Projet achevé auprès du CR : 01/05/2026