Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Silva Soares, Luis Eduardo [1] ; Melo, Teresa Marly T. C. [1] ; Brandim, Ayrton de Sa [2] ; de Oliveira, Ivone Regina [3]
Total Authors: 4
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: MICROSCOPY RESEARCH AND TECHNIQUE; v. 82, n. 7, p. 1114-1126, JUL 2019.
Web of Science Citations: 0
Abstract

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)