Effect of Thermo-Mechanical Cycling on The Vertical Marginal Gap of Different CAD/CAM Crowns (In-vitro Study). | ||||
| Al-Azhar Journal of Dental Science | ||||
| Volume 28, Issue 3, July 2025, Page 387-392 PDF (385.92 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajdsm.2023.254479.1480 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Mohamed Ismail Elmokadem   1; Khaled mohamed Haggag2; Hssein Ramadan Mohammed 3
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| 1Crown and bridge department Faculty of Dentistry, al Azhar university | ||||
| 2Crown and bridge department, Faculty of dentistry, Al-Azhar university | ||||
| 3Department of Crown and Bridge, Faculty of Dental Medicine, Al-Azhar University in Cairo-Egypt. | ||||
| Abstract | ||||
| Objective: To evaluate the effect of Thermo-mechanical cycling on the vertical marginal gap of different CAD/CAM crowns. Materials and Methods: A maxillary first premolar tooth was selected, and the tooth was prepared using a CNC; the machine was adjusted to reduce the tooth to fulfill the criteria of all ceramic crown designs. Special mold fabrication responsible for tooth mounting and replication. The tooth was duplicated twenty-one times with epoxy resin materials with a specially designed tray, paired with the special mold to give twenty-one identical epoxy dies. Then, twenty-one CAD/CAM crowns were fabricated and divided into three groups (n = 7) according to the material used: IPS emax CAD (LD), Vita ENAMIC (VE), and Tetric CAD. All samples were cemented with a universal bond (Tetric N bond) and adhesive resin cement (Variolink Esthetic DC). The vertical marginal gap was recorded with a digital microscope. Subsequently, all samples were Thermo-mechanical cycled TMC (5 °C to 55 °C, 30s, 75,000 cycles). Then, the vertical marginal gap was re-evaluated. Results: The vertical marginal gap showed no significant difference between the tested groups before TMC; LD (28.04±8.21µm) had the highest value, followed by VE (26.66±8.1µm) and Tetric CAD (21.18±2.97µm); however, the vertical marginal gap showed a significant difference between the tested groups after TMC the highest mean value was recorded in VE (38.76±8.39 µm), followed by Tetric CAD (34.91±8.73µm), with the lowest value recorded in LD (15.39±1.99). Conclusions: Thermo-mechanical cycling affected the vertical marginal gap of all tested materials. | ||||
| Keywords | ||||
| Vertical marginal gap; CAD/CAM; Composite resin; Ceramic-polymer; Thermo-mechanical cycling | ||||
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