to evaluate the chemical composition and properties of Resilon,Active GP,and conventional Gutta-Percha cones by using polarized energy dispersive X-ray fluorescense (PEDXRF) and Raman Confocal Spectroscopy (CRS).
Methods:
All samples were ground into fine powder in an agate mortar and then pressed into the thick pellets of 32 mm diameter using wax as blinder. Multi-element concentration was determined by using the polarized energy dispersive XRF. The spectrometer used in this study was a Spectro XLAB 2000 PEDXRF spectrometer which was equipped with a Rh anode X-ray tube, 0.5mm Be side window. The detector of spectrometer is Si(Li) by liquid N2 cooled with resolution of < 150eV at Mn KĄ, 5000 cps. The spectrometer of PEDXRF configures such as source beam, scattered beam and fluorescent beam all at mutually orthogonal angles. The samples were analysed by a Confocal Raman (HR-800 HORIBA-JobinYvon, France) for identification of the Raman spectrum features of Resilon, Active GP and Gutta-Percha. Raman measurements were performed with a Horiba Jobin-Yvon equipped with a laser operating at a wavelength of 633 nm.
Results:
The geochemical composition of Resilon, Active GP and Gutta-Percha samples and concentrations of elements were analyzed by the PEDXRF .The identification of the samples were controlled by Raman Confocal Spectrometry.The results showed that Resilon, Active GP and Gutta-Percha samples have different proportions of Si, Ti, Cl, Zn, Rb, Sr, Ba and Bi.Active-GP is differ from the Resilon, and Gutta-Percha by high amount of Zr,Y and Hf. On the other hand,the Resilon had high concentration of Cl,and Bi.
Conclusions:
PEDXRF technique and Raman Confocal Spectrometer were useful methods for quantitative and chemical studies.Multi-elemental concentrations of three different gutta-percha points showed that Active GP and Resilon must be harder,more brittle and stiff than conventional Gutta-Percha points.