Development of polymer-ceramic biocomposits for application in endodontia

Reference Presenter Authors
(Institution)
Abstract
02-083 Josué da Silva Buriti Buriti, J.d.(Universidade Federal de Campina Grande); Barreto, M.E.(Universidade Federal de Campina Grande); Fook, M.V.(Universidade Federal De Campina Grande); The search for new systems with performance and properties optimized for innovative applications and the improvement of existing ones is one of the reasons for the current technological and scientific evolution. Partly in the health area, the materials used are broad-spectrum and biomaterial properties, such as biomedical devices, implantable materials, devices for the release of drugs, artificial organs, dressings, as well as in the development of dental materials, as in the treatment of lesions and diseases of the pulp and root of the tooth. Thus, the objective of this work was to study the thermal, spectroscopic and biological properties of hydroxyapatite-wollastonite powders obtained sol-gel process and of chitosan-hydroxyapatite-wollastonite biocomposites. For sol-gel process powders, wollastonite becker, calcium nitrate tetrahydrate, ammonium dihydrogenphosphate, deionized water and ethyl alcohol were added in a ratio of 1 or 2 : 2 : 1.2 : 6 : 4 mol, respectively. The mixture was maintained at pH 9 with magnetic stirring for 1 h at 70 °C until gelation occurred. After, the gel was dried at 120 °C for 16 h, and then the xerogel was thermally treated at 700 °C for 2 h and then macerated. The sol gel powders were then added to the 1% chitosan solution in 0.1 mol/L lactic acid and mechanically shaken at 600 rpm for 40 min. After the mixture was placed in petri dish and maintained at 37 °C for 24 h and then neutralized for 72 h, obtaining biocomposites with proportions of 20, 40 and 60% of the inorganic phase and pure membrane. The materials were characterized by TG, DSC, XRD, FTIR and cytotoxicity. Based on the properties studied, the 60%A (biocomposite type A with 1 mole wollastonite and 60% load percentage) and 60%B (biocomposite type B with 2 mols of wollastonite and percentage of 60% of load) samples present biomaterial potential with prospects of endodontic use, which presented cellular viability in L929 fibroblast cell culture above 70.00%.
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