Effects of glass-ceramic spray deposition manipulation on the surface characteristics of zirconia dental restorations |
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| Affiliation: | 1. School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan;2. Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan;3. Huayi Dental Laboratory, Taipei, Taiwan;4. Department of Dentistry, National Yang Ming Chiao Tung University, Taipei, Taiwan;5. Division of Dental Technician, Department of Clinical Practice and Support, Hiroshima University Hospital, Hiroshima, Japan;6. School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan;7. Master Program for Biomedical Engineering, College of Biomedical Engineering, China Medical University, Taichung, Taiwan |
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| Abstract: | A novel glass-ceramic spray deposition (GCSD) method was developed to modify the yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) surface and to enhance the bond strength between Y-TZP and resin cement. Five different experimental groups were characterized, non-treatment (NT), airborne particle abrasion (AB), GCSD without etching (GS), GCSD with 5% HF etching (GSE5), and GCSD with 9.5% HF etching (GSE9), to determine the optimal method for improving the bond strength. Scanning electron microscopy and an argon ion milling system were used to investigate the surface and cross-sectional microstructures. The changes in the surface characteristics of Y-TZP were analyzed via contact angle analysis, atomic force microscopy, X-ray diffraction, and energy-dispersive X-ray spectrometry. The bond strengths were determined using shear bond strength test. The results revealed that GCSD could produce a dense and uniform lithium disilicate glass-ceramic coating layer and infiltrate the Y-TZP surface. This coating resulted in superior micromechanical interlocking and increased hydrophilicity, thereby enhancing the bond strength between Y-TZP and resin cement (P < 0.05). The study findings indicated that GCSD accompanied by 5% HF etching for 100 s is optimal for strengthening the Y-TZP/resin cement bond, thereby providing a novel solution for dental bonding systems. |
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| Keywords: | Spray deposition Zirconia Glass-ceramic Interface debonding Dental prosthesis |
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