Chemical and morphological evaluation of enamel and dentin near cavities restored with conventional and zirconia modified glass ionomer subjected to erosion‐abrasion
| Autor: | Ivone Regina de Oliveira, Luís Eduardo Silva Soares, Ayrton de Sá Brandim, Teresa Marly T. C. Melo |
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| Rok vydání: | 2019 |
| Předmět: |
Toothbrushing
Abrasion (dental) Histology Materials science Scanning electron microscope Glass ionomer cement 02 engineering and technology Dental Caries 03 medical and health sciences 0302 clinical medicine stomatognathic system Materials Testing Dentin medicine Animals Tooth Erosion Cubic zirconia Composite material Dental Enamel Saliva Instrumentation Cement Orange juice Enamel paint Spectrometry X-Ray Emission 030206 dentistry 021001 nanoscience & nanotechnology medicine.disease Medical Laboratory Technology medicine.anatomical_structure Glass Ionomer Cements visual_art Microscopy Electron Scanning visual_art.visual_art_medium Cattle Zirconium Anatomy 0210 nano-technology |
| Zdroj: | Microscopy Research and Technique. 82:1114-1126 |
| ISSN: | 1097-0029 1059-910X |
| DOI: | 10.1002/jemt.23259 |
| Popis: | Microenergy dispersive X-ray fluorescence (μ-EDXRF) spectroscopy and scanning electron microscopy (SEM) were used to test the hypothesis that zirconia modified glass ionomer cement (GIC) could improve resistance to erosion-abrasion to a greater extent than conventional cement. Bovine enamel (n = 40) and dentin (n = 40) samples were prepared with cavities, filled with one of the two restorative materials (GIC: glass-ionomer cement or ZrGIC: zirconia-modified GIC). Furthermore, the samples were treated with abrasion-saliva (AS) or abrasion-erosion cycles (AE). Erosive cycles (immersion in orange juice, three times/day for a duration of 1 min over a 5 day period) and/or abrasive challenges (electric toothbrush, three times/day for a duration of 1 min over a 5 day period) were performed. Positive mineral variation (MV%) on the enamel after erosion-abrasion was observed for both materials (p < 0.05), whereas a negative MV% on the dentin was observed for both materials and treatments (p < 0.05). The SEM images showed clear enamel loss after erosion-abrasion treatment and material degradation was greater in GIC_AE compared to those of the other groups. Toothbrush abrasion showed a synergistic effect with erosion on substance loss of bovine enamel, dentin, GIC, and ZrGIC restorations. Zirconia addition to the GIC powder improved the resistance to abrasive-erosive processes. The ZrGIC materials may find application as a restorative material due to improved resistance as well as in temporary restorations and fissure sealants. |
| Databáze: | OpenAIRE |
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