Microanálise de superfície e caracterização química de cimentos endodônticos

• Ano de defesa: 2013
• Autor(a) principal: Sampaio, Felipe Cavalcanti
• Orientador(a): Estrela, Carlos
• Banca de defesa: Estrela, Carlos, Alencar, Ana Helena Gonçalves de, Veloso, Heloísa Helena Pinho, Guedes, Orlando Aguirre
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Odontologia (FO)
• Departamento: Faculdade de Odontologia - FO (RG)
• País: Brasil
• Palavras-chave em Português: Microscopia eletrônica de varredura; Espectroscopia de dispersão de raios-X; Propriedades químicas; Materiais obturadores
• Palavras-chave em Inglês: Energy-dispersive X-ray analysis; Scanning electron microscopy; Chemical properties; Root canal filling materials
• Área do conhecimento CNPq: ODONTOLOGIA::ENDODONTIA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/8569

Purpose: to assess the surface and evaluate the chemical composition of root canal filling materials by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). Methods: eighteen polyethylene standard tubes were filled with the tested materials: Sealapex®, Sealer 26®, MTA Fillapex®, Pulp Canal Sealer®, Endofill® and AH Plus®. After 48 hours at 37°C and 95% relative humidity, the samples were surface-sputtered with gold, led to SEM and the images analyzed at 5,000X magnification. Then, the elements distribution and chemical composition were determined by EDX. The results were evaluated qualitatively (SEM images and elements distribution maps) and quantitatively (weight percentage). Results: the surface analysis revealed that the sealers presented different regularities, with an uniform distribution of elements, with particles of similar sizes and variable shapes in EDX microanalysis. Calcium oxide and hydroxide based sealers (Sealapex® and Sealer 26®) presented calcium peaks of 53.58wt.% and 65.00wt.%, respectively. MTA Fillapex® presented 30.58wt.% of calcium and high amounts of silicon (31.02 weight%) and bismuth (27.38 weight%). Zinc oxide and eugenol based sealers, Pulp Canal Sealer® and Endofill®, showed zinc quantities of 67.74wt% and 63.16wt.%, respectively. AH Plus® had higher amount of zirconium (64.24wt.%). The materials presented elements incompatible with the composition described by the manufacturer. Conclusions: the root canal sealers’ surfaces showed different. The elements presented uniform distribution, with particles of similar sizes and variable shapes. Chemical elements were found in the root canal sealers not described by the manufacturers.