Chemical and morphological evaluation of enamel and dentin near cavities restored with conventional and zirconia modified glass ionomer subjected to erosion-abrasion

Autor(es)

Silva Soares, Luis Eduardo ^[1] ; Melo, Teresa Marly T. C. ^[1] ; Brandim, Ayrton de Sa ^[2] ; de Oliveira, Ivone Regina ^[3]

Afiliação do(s) autor(es)

^[1] Univ Vale Paraiba UNIVAP, Inst Pesquisa & Desenvolvimento, Lab Odontol & Mat Aplicados, Sao Paulo - Brazil

^[2] Diretoria Pesquisa Posgrad & Inovacao, Inst Fed Educ Ciencia & Tecnol Piaui IFPI, Teresina, Piaui - Brazil

^[3] Univ Vale Paraiba UNIVAP, Inst Pesquisa & Desenvolvimento, Lab Ceram Avancadas, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MICROSCOPY RESEARCH AND TECHNIQUE; v. 82, n. 7, p. 1114-1126, JUL 2019.
• Citações Web of Science: 0

Resumo

Microenergy dispersive X-ray fluorescence (mu-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. (AU)

• Processo FAPESP: 05/50811-9 - Estudo do colágeno da dentina por técnicas de microanálise
• Beneficiário: Airton Abrahao Martin
• Modalidade de apoio: Auxílio à Pesquisa - Regular