Marginal Assessment Of Printable And Machinable Polymer-Based Ceramics For Partial Restorations. An In-Vitro Study | ||||
| Egyptian Dental Journal | ||||
| Volume 71, Issue 1 - Serial Number 4, January 2025, Page 543-552 PDF (1.25 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2024.321702.3203 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Sara Mehanna Foudah   1; Ayman Gala eldin Eldimeery 2
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| 1PhD, Senior Lecturer, Fixed Prosthodontics Department, Faculty of Dentistry, Ain Shams University, Egypt | ||||
| 2Doctor of Philosophy. Program Director at Galala University,Suez, Egypt | ||||
| Abstract | ||||
| Objective: This study assessed the impact of margin design and fabrication technique on the marginal adaptation of printable and machinable polymer-based ceramic occlusal veneers. Materials and Methods: Thirty-six extracted human maxillary first premolars were prepared with either a butt or chamfer margin design (n=18) and randomly subdivided to receive occlusal overlays by two fabrication techniques: 3D printed or milled (n=9). The 3D-printed group used ceramic-filled resin material (VarseoSmile Crown plus, Bego, Germany) processed with a DLP printer, while the milled group used Cerasmart (GC America Inc.) blocks and a CEREC MC XL (Dentsply, Sirona) milling machine. Marginal gaps were measured at three points along the restoration using a digital microscope, and results were analyzed with two-way ANOVA. Results: There was a significant interaction between margin design and fabrication technique (p = 0.005). For butt margins, no significant difference in marginal gap was found between 3D-printed and milled samples (p = 0.681). Chamfer margins in the 3D-printed group showed significantly larger gaps compared to the milled group (p < 0.001). Within the 3D-printed group, chamfer margins had larger gaps than butt margins (p = 0.002), while the milled group showed no significant difference between margin designs (p = 0.365). Conclusion: Margin design and fabrication process affect the marginal adaptation of polymer-based ceramic overlays. 3D-printed restorations have greater marginal gaps than milled ones, indicating a need for improvement in 3D-printing technology for intricate patterns like chamfer margins. | ||||
| Keywords | ||||
| polymer-based ceramics; overlays; margin; 3D-printing; milling | ||||
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