Evaluation of micro shear bond strength of ormocer after various ceramic materials surface treatments | ||||
| Al-Azhar Journal of Dental Science | ||||
| Volume 28, Issue 3, July 2025, Page 413-421 PDF (1.03 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajdsm.2025.398844.1625 | ||||
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| Author | ||||
Ahmad El Gamal  
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| Fixed Prosthodontics Department Faculty of Dentistry The British University in Egypt | ||||
| Abstract | ||||
| Purpose: The purpose of this study was to assess the impact of various surface treatments on the ormocer's microshear bond strength bonded to different CAD/CAM materials. Materials and Methods: Zirconia Reinforced Lithium Silicate Glass-ceramic and Flexible Nanoceramic materials CAD-CAM blocks were used. Different surface treatments were performed on sliced specimens where in Group1, no surface treatments; Group 2, Sandblasting was done using 50 aluminum oxide powder and silane, Group 3; 8% hydrofluoric acid etching and silane, and Group 4; dry grinding using a green coded diamond stone and silane. The repair material underwent thermocycling for 5000 cycles between 5o C and 55o C. A universal testing device was used to assess the micro shear bond strength at a crosshead speed of 0.5 mm/min until failure occurs. A stereomicroscope was used to test the failure modes. In addition to the Kruskal-Wallis and Mann-Whitney tests, 2-way ANOVA was used to statistically examine the data (= 0.05). Results: The hydrofluoric acid etching had the highest (mean SD) value in the zirconia reinforced lithium silicate ceramic and there was no significant difference between all other groups. For the Flexible Nanoceramic, grinding had the highest (mean SD) value and the three surface treatments did not differ significantly from one another. Conclusion: The best surface treatment protocol for the repair of Zirconia Reinforced Lithium Silicate Glass-ceramic is the hydrofluoric acid etching followed by silane. The flexible nanoceramic repair could be done using either sandblasting, hydrofluoric acid etchant or dry grinding, followed by silane. | ||||
| Keywords | ||||
| Ceramic; Micro-shear bond strength; Surface treatment; Ormocer | ||||
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