Chemical and X-ray analyses of five brands of dental gutta-percha cone

To determine the chemical composition of five commercially available nonstandardized gutta-percha points. The organic fraction (gutta-percha polymer and wax/resin) of nonstandardized gutta-percha points (Dentsply, Tanari, Konne, Obtura Spartan and Analytic Endodontics) was separated from the inorgan...

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Bibliographic Details
Published in:International endodontic journal 2003-04, Vol.36 (4), p.302-307
Main Authors: Gurgel-Filho, E. D., Andrade Feitosa, J. P., Teixeira, F. B., Monteiro de Paula, R. C., Araújo Silva Jr, J. B., Souza-Filho, F. J.
Format: Article
Language:English
Subjects:
composition
dental cone
Dentistry
Electron Probe Microanalysis
gutta-percha
Gutta-Percha - chemistry
X-Ray Diffraction
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Summary:To determine the chemical composition of five commercially available nonstandardized gutta-percha points. The organic fraction (gutta-percha polymer and wax/resin) of nonstandardized gutta-percha points (Dentsply, Tanari, Konne, Obtura Spartan and Analytic Endodontics) was separated from the inorganic fraction (ZnO and BaSO4) by dissolution in chloroform. Gutta-percha polymer was precipitated with acetone. Zinc oxide was partially separated from barium sulphate by reaction with HCl. Energy-dispersive X-ray microanalysis and X-ray diffraction were employed to identify the chemical elements and compounds (barium sulphate and zinc oxide). The barium sulphate content was calculated by percentage of sulphur from elemental microanalysis. All analyses were repeated three times. The means and standard deviations of the percentage by weight of gutta-percha in the points were: Dentsply (14.5 +/- 0.70%), Tanari (15.6 +/- 0.66%), Obtura (17.7 +/- 0.35%), Konne (18.9 +/- 0.32%) and Analytic (20.4 +/- 0.40%). The mean and SD of the zinc oxide content were: Dentsply (84.3 +/- 0.50%), Tanari (82.0 +/- 0.72%), Obtura (69.5 +/- 0.21%), Konne (78.0 +/- 0.05%) and Analytic (66.5 +/- 0.50%). The method was appropriate to quantify gutta-percha and resin/wax components of gutta-percha points, but not barium sulphate and zinc oxide. An alternative procedure to determine barium sulphate and zinc oxide contents has been proposed based on elemental microanalysis of sulphur. Some brands of gutta-percha did not contain barium sulphate.
ISSN:0143-2885
1365-2591
DOI:10.1046/j.1365-2591.2003.00653.x