Fracture Resistance of Simulated Immature Teeth Reinforced with Different Mineral Aggregate-Based Materials

• Autor(a) principal: Pandolfo, Mariana Travi
• Data de Publicação: 2021
• Outros Autores: Rover, Gabriela, Bortoluzzi, Eduardo Antunes, Teixeira, Cleonice da Silveira, Rossetto, Hebert Luís, Fernades, Paula Cristina Dos Santos Vaz, Côrte-Real, Inês Sansonetty Gonçalves, Carvalho, Sandra Maria Fernandes, Garcia, Lucas da Fonseca Roberti
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/101070; https://doi.org/10.1590/0103-6440202104236
• topic: Immature Teeth; Calcium Aluminate Cement; Silicate Cement; Calcium Carbonate; Fracture Resistance; Aluminum Compounds; Calcium Compounds; Dental Cements; Drug Combinations; Humans; Oxides; Root Canal Obturation; Silicates; Tooth Apex; Root Canal Filling Materials; Tooth Fractures

This study assessed the fracture resistance of simulated immature teeth reinforced with calcium aluminate cement (CAC) or mineral trioxide aggregate (MTA) containing calcium carbonate nanoparticles (nano-CaCO3). The microstructural arrangement of the cements and their chemical constitution were also evaluated. Forty-eight canines simulating immature teeth were distributed into 6 groups (n=8): Negative control - no apical plug or root canal filling; CAC - apical plug with CAC; CAC/nano-CaCO3 - apical plug with CAC+5% nano-CaCO3; MTA - apical plug with MTA; MTA/nano-CaCO3 - apical plug with MTA+5% nano-CaCO3; and Positive control - root canal filling with MTA. The fracture resistance was evaluated in a universal testing machine. Samples of the cements were analyzed under Scanning Electron Microscope (SEM) to determine their microstructural arrangement. Chemical analysis of the cements was performed by Energy Dispersive X-ray Spectroscopy (EDS). The fracture resistance of CAC/nano-CaCO3 was significantly higher than the negative control (p<0.05). There was no significant difference among the other groups (p>0.05). Both cements had a more regular microstructure with the addition of nano-CaCO3. MTA samples had more calcium available in soluble forms than CAC. The addition of nano-CaCO3 to CAC increased the fracture resistance of teeth in comparison with the non-reinforced teeth. The microstructure of both cements containing nano-CaCO3 was similar, with a more homogeneous distribution of lamellar- and prismatic-shaped crystals. MTA had more calcium available in soluble forms than CAC.