EFFECT OF WEAR ON HARDNESS OF 3D PRINTED AND CAD-CAM MILLED RESIN-BASED RESTORATIVE MATERIALS (IN VITRO STUDY) | ||||
| Alexandria Dental Journal | ||||
| Article 13, Volume 50, Issue 2, August 2025, Page 202-209 PDF (417.53 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/adjalexu.2024.315883.1533 | ||||
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| Authors | ||||
Nodar Mohamed Ghrebi  1; Mohamed Mahmoud El-Kateb2; Yasser Mohamed Aly3
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| 1conservative dentistry, dentistry, Alexandria university, Alexandria, Egypt | ||||
| 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. | ||||
| Keywords | ||||
| Wear; Flexcera; Brilliant crios; Vickers hardness number (VHN) | ||||
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