Marina Angélica Marciano1, Bruno Martini Guimarães2, Pablo Amoroso-Silva2, Josette Camilleri3, Marco Antonio Hungaro Duarte2. 1. Department of Dentistry, Dental School of Bauru, University of São Paulo-USP, Bauru, São Paulo, Brazil. Electronic address: mammarciano@gmail.com. 2. Department of Dentistry, Dental School of Bauru, University of São Paulo-USP, Bauru, São Paulo, Brazil. 3. Department of Restorative Dentistry, Faculty of Dental Surgery, University of Malta, Msida, Malta.
Abstract
INTRODUCTION: The aim of this study was to evaluate the physical, chemical, and biological properties of mineral trioxide aggregate (MTA) mixed with 80% distilled water and 20% propylene glycol (PG) compared with MTA mixed with distilled water only. METHODS: Flowability, film thickness, and solubility were analyzed according to American National Standards Institute/American Dental Association specification 57/2000. Initial and final setting times were assessed according to American Society for Testing and Materials specification C266/08. Porosity was assessed by using mercury intrusion porosimetry after 1 and 28 days of hydration, and the pH and calcium ion release were assessed after 3, 24, 72, and 168 hours. For the tissue reaction, the cements were implanted in 24 albino rats (2 groups, n = 12). An analysis of the inflammatory infiltrate was performed after 15, 30, and 60 days. RESULTS: MTA + PG exhibited lower film thickness and higher final setting time. No differences were verified for flowability (P > .05). MTA + PG showed high porosity at 1 day of hydration (P < .05). All the test cements demonstrated an alkaline pH. Microscopic analysis of the specimens revealed neoformation of connective tissue in contact with the cements. CONCLUSIONS: The introduction of PG as a mixing vehicle alters the physical and chemical properties of MTA and is biologically acceptable.
INTRODUCTION: The aim of this study was to evaluate the physical, chemical, and biological properties of mineral trioxide aggregate (MTA) mixed with 80% distilled water and 20% propylene glycol (PG) compared with MTA mixed with distilled water only. METHODS: Flowability, film thickness, and solubility were analyzed according to American National Standards Institute/American Dental Association specification 57/2000. Initial and final setting times were assessed according to American Society for Testing and Materials specification C266/08. Porosity was assessed by using mercury intrusion porosimetry after 1 and 28 days of hydration, and the pH and calcium ion release were assessed after 3, 24, 72, and 168 hours. For the tissue reaction, the cements were implanted in 24 albino rats (2 groups, n = 12). An analysis of the inflammatory infiltrate was performed after 15, 30, and 60 days. RESULTS:MTA + PG exhibited lower film thickness and higher final setting time. No differences were verified for flowability (P > .05). MTA + PG showed high porosity at 1 day of hydration (P < .05). All the test cements demonstrated an alkaline pH. Microscopic analysis of the specimens revealed neoformation of connective tissue in contact with the cements. CONCLUSIONS: The introduction of PG as a mixing vehicle alters the physical and chemical properties of MTA and is biologically acceptable.
Authors: Cláudio M A Ferreira; Luciana M Sassone; Alexia S Gonçalves; Jorge José de Carvalho; Christopher J Tomás-Catalá; David García-Bernal; Ricardo E Oñate-Sánchez; Francisco J Rodríguez-Lozano; Emmanuel João Nogueira Leal Silva Journal: Sci Rep Date: 2019-03-08 Impact factor: 4.379
Authors: Índia Olinta de Azevedo Queiroz; Thiago Machado; Camila Carneiro Alves; Victor Gustavo Balera Brito; Bruno Carvalho de Vasconcelos; João Eduardo Gomes-Filho; Edilson Ervolino; Sandra Helena Penha de Oliveira; Marco Antonio Hungaro Duarte Journal: J Mater Sci Mater Med Date: 2021-11-24 Impact factor: 3.896