Physicochemical properties and antimicrobial activity of calcium hydroxide pastes in association with other compounds

• Autor(a) principal: Borges, Mariana Maciel Batista
• Data de Publicação: 2021
• Outros Autores: Frank, Mayara Conde, Zancan, Rafaela Fernandes, Tartari, Talita, Vivan, Rodrigo Ricci, Duarte, Marco Antonio Hungaro
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian journal of oral sciences (Online)
• DOI: 10.20396/bjos.v20i00.8662098
• Texto Completo: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8662098
• topic: Anti-infective agents; Biofilms; Calcium hydroxide; Root canal filling materials; Chemical phenomena

Aim: This study aimed to evaluate the pH, Ca2+ release, solubility, and antimicrobial activity of calcium hydroxide (Ca(OH)2) pastes in association with different substances. Methods: Sixty acrylic teeth (n=10) were filled with pastes that associated Ca(OH)2 with the following substances: benzalkonium chloride 5% (G1) and 50% (G2) both in propylene glycol, arnica glycolic extract (G3), green tea glycolic extract (G4), Calen/PMCC™ (G5), and Calen™ (G6). In the group G1 to G4 were used 1g of Ca(OH)2 powder with 0,8g of vehicle. pH and Ca2+ release was measured after 7, 15, and 30 days. For solubility, micro-CT was used immediately and at the periods of 7, 15, and 30 days. For the antimicrobial analysis, a biofilm of E. faecalis was induced in vitro on bovine dentin discs. Live/dead viability dye and confocal scanning microscopy were used. Results: The highest pH values occurred on the first 7 days, and the G6, G1, G3, and G5 presented the highest pH values at this period (P <0.05). Ca2+ release was higher in all groups at 7 days, with the highest values observed in G1, G5, and G6. The volume of all pastes showed no significant difference in the intragroup analysis at 7 and 15 days (P <0.05). G1 and G2 showed the highest antimicrobial action (P <0.05). For the biovolume, there was difference between the G6 and the other groups (P >0.05) with G1 presenting the lowest values. Conclusion: Benzalkonium chloride 5% increases the antimicrobial action of the Ca(OH2), without impairs physicochemical properties.