Influence of bismuth oxide concentration on the pH level and biocompatibility of white Portland cement

• Autor(a) principal: MARCIANO, Marina Angélica
• Data de Publicação: 2014
• Outros Autores: GARCIA, Roberto Brandão, CAVENAGO, Bruno Cavalini, MINOTTI, Paloma Gagliardi, MIDENA, Raquel Zanin, GUIMARÃES, Bruno Martini, ORDINOLA-ZAPATA, Ronald, DUARTE, Marco Antonio Hungaro
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of applied oral science (Online)
• Texto Completo: https://www.revistas.usp.br/jaos/article/view/84012

Objectives: To investigate if there is a relation between the increase of bismuth oxide and the decrease of pH levels and an intensification of toxicity in the Portland cement. Material and Methods: White Portland cement (WPC) was mixed with 0, 15, 20, 30 and 50% bismuth oxide, in weight. For the pH level test, polyethylene tubes were filled with the cements and immersed in Milli-Q water for 15, 30 and 60 days. After each period, the increase of the pH level was assessed. For the biocompatibility, two polyethylene tubes filled with the cements were implanted in ninety albino rats (n=6). The analysis of the intensity of the inflammatory infiltrate was performed after 15, 30 and 60 days. The statistical analysis was performed using the Kruskal-Wallis, Dunn and Friedman tests for the pH level and the Kruskal-Wallis and Dunn tests for the biological analysis (p;0.05). For the inflammatory infiltrates, no significant statistical differences were found among the groups in each period (p>;0.05). The 15% WPC showed a significant decrease of the inflammatory infiltrate from 15 to 30 and 60 days (p