Ghrebi, N., El-Kateb, M., Aly, Y. (2025). EFFECT OF WEAR ON HARDNESS OF 3D PRINTED AND CAD-CAM MILLED RESIN-BASED RESTORATIVE MATERIALS (IN VITRO STUDY). Alexandria Dental Journal, 50(2), 202-209. doi: 10.21608/adjalexu.2024.315883.1533
Nodar Mohamed Ghrebi; Mohamed Mahmoud El-Kateb; Yasser Mohamed Aly. "EFFECT OF WEAR ON HARDNESS OF 3D PRINTED AND CAD-CAM MILLED RESIN-BASED RESTORATIVE MATERIALS (IN VITRO STUDY)". Alexandria Dental Journal, 50, 2, 2025, 202-209. doi: 10.21608/adjalexu.2024.315883.1533
Ghrebi, N., El-Kateb, M., Aly, Y. (2025). 'EFFECT OF WEAR ON HARDNESS OF 3D PRINTED AND CAD-CAM MILLED RESIN-BASED RESTORATIVE MATERIALS (IN VITRO STUDY)', Alexandria Dental Journal, 50(2), pp. 202-209. doi: 10.21608/adjalexu.2024.315883.1533
Ghrebi, N., El-Kateb, M., Aly, Y. EFFECT OF WEAR ON HARDNESS OF 3D PRINTED AND CAD-CAM MILLED RESIN-BASED RESTORATIVE MATERIALS (IN VITRO STUDY). Alexandria Dental Journal, 2025; 50(2): 202-209. doi: 10.21608/adjalexu.2024.315883.1533
EFFECT OF WEAR ON HARDNESS OF 3D PRINTED AND CAD-CAM MILLED RESIN-BASED RESTORATIVE MATERIALS (IN VITRO STUDY)
2Professor of Fixed Prosthodontics, Fixed Prosthodontics Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
3Conservative dentistry department,Faculty of Dentistry,Alexandria University
Abstract
Background: Recently introduced permanent fixed dental restorations using milled and 3D printed materials. They must be biocompatible and mechanically strong enough to survive mastication. Currently, no material meets these specifications. Purpose: To determine how wear affects resin-based restorative materials made by 3D printing and milling. Materials and Methods: Twenty bar specimens (15 mm x 4 mm x 1.5 mm) were divided into two groups: 3D printed Flexcera Smile Ultra + permanent resin (FSU) (n=10) and milled Brilliant crios (BC) (n=10). All groups underwent finishing using composite polishing kits. Artificial toothbrushing machine wear was tested. A weight loss test measured specimen wear. Vickers hardness tests were used to quantify the surface microhardness of additive manufactured and milled resin specimens and assign a VHN value. Wear and hardness data were analyzed using one-way ANOVA and Tukey's post hoc test. Results: All materials exhibited wear reduction following the intervention, whereas Flexcera Smile Ultra+ showed the least and Brilliant Crios the highest. Significant changes in hardness were found between all groups before and after intervention (p < 0.0001). This demonstrates that the intervention reduced hardness in all materials, with varying degrees of change. Conclusion: Based on their properties, artificial toothbrushing affected each material differently. 3D printed resin had the lowest wear and hardness value. Milled resin had the highest wear and the highest hardness.
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