Decomposição de biocerâmica pelo método biomimético em cones endodônticos de guta-percha.

Abstract

The success of an endodontic treatment is primarily related to the hermetic and three-dimensional obturation of the root canal system. The obturator material must occupy all the space of the removed pulp, be dimensionally stable and biologically compatible, providing a favorable environment to process of tissue repairing. Gutta-percha cones are the common material used on the obturation of the root canal filling ,however, is a bioinerte material which doesn’t contribute to the formation of mineralized tissue, essential condition to obtain clinical success. The aim of this study was to modify the surface of the Endodontic cones of guttapercha and developing a bioactivity process by the Biomimetic method, favoring the apical repair for the deposition of the mineralized tissue by the organism. For the surface modification of gutta-percha cones was performed a prior chemical treatment with hydrogen peroxide at 30%, for times 2,4 and 6 hours in order to change the polarity of the surface and consequently it’s surface tension allowing better conditions for bioceramic film deposition performed by Biomimetic method by two cycles of 7 and 14 days. The characterization techniques used in this study were: Surface tension (ST), the Scanning Electron Microscopy and Energydispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD) and Degradation in simulated biological environment. The results obtained by ST, SEM-EDS, FTIR, XRD showed that the solution of H2O2 in 30% was adequate as method of modification of the surface of the cones DE and TE, it allowed the formation of functional hydrophilic groups which acted as sites for the nucleation and formation of apatite crystals by biomimetic method. The biodegradation test showed that the gutta-percha cones DE and TE exhibit great resistance to degradation under the conditions used in this work.