Avaliação de propriedades físicas, químicas e biológicas de cimentos Portland associados a radiopacificadores micro e nanoparticulados

• Autor(a) principal: Bosso, Roberta [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/108444
• topic: Endodontia; Materiais dentários; Cimento portland; Dental materials

Portland Cement (PC) is calcium silicate cement. Changes in its composition by additives and resins can improve their handling and setting time. It was evaluated MTA Angelus and different calcium silicate cements: pure (CSC), modified (CSCM), resin 1 (CSCR1), resin 2 (CSCR2) and resin 3 (CSCR3). After selection of two cements, they were associated with radiopacifiers: zirconium oxide (ZrO2) or niobium oxide (Nb2O5) micro or nanoparticulate, calcium tungstate (CaWO4) or bismuth oxide (Bi2O3). In the first fase (Chapter 1), setting time, flow, compressive strength, quantification of arsenic, radiopacity and cell viability were evaluated. In the second study, it were evaluated the setting time, flow, solubility, radiopacity, compressive strength, pH, calcium (Chapter 2), in addition to surface chemical composition, MTT and apoptosis/necrosis (Chapter 3) of cements CSCM and CSCR2 associated to radiopacifiers. Data were subjected to analysis of variance and Tukey test (p˂0.05). All sealers showed arsenic in compatible with clinical use levels, and showed biocompatibility. The CSCR2 showed higher flow. The associations of CSCM + CaWO4 and CSCR2 with ZrO2 or Nb2O5 micro or CaWO4 and MTA Angelus had lower setting time, and CSCM and CSCR2 + ZrO2 micro largest flow. All cements showed low solubility, alkaline and released calcium ions. Also, they have particles larger than the size MTA, calcium and silicon were present in their composition and they were biocompatible. It was concluded that the CSCM and CSCR2 cements have potential clinical use when associated with radiopacifiers reviews, specially the ZrO2 and Nb2O5 microparticulated.