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Dent. J. 2018, 6(3), 37;

Analysis of Chemical Composition of Different Irreversible Hydrocolloids

Faculty of Dentistry, Federal Fluminense University, Alameda Barros TerraStreet—Centro, Niterói-RJ 24020-150, Brazil
Faculty of Dentistry, Federal University of Rio de Janeiro, 255th Professor Rodolpho Paulo Rocco Street—Ilha do Fundão, Rio de Janeiro-RJ21941-913, Brazil
Faculty of Dentistry, Educational Foundation Serra dos Órgãos, 111th Alberto Tôrres Av., Alto, Teresópolis-RJ 25964-004, Brazil
Author to whom correspondence should be addressed.
Received: 4 July 2018 / Revised: 29 July 2018 / Accepted: 31 July 2018 / Published: 2 August 2018
(This article belongs to the Section Dental Materials)
Full-Text   |   PDF [232 KB, uploaded 2 August 2018]


Irreversible hydrocolloids (IR) is a dental impression material commonly used in Brazilian and European dental practice because it is inexpensive, easy to handle, has good reproductive detail and is comfortable for the patient. This research aimed to analyze the chemical composition of eight different IRs for dental use. A sample of 0.2 g was weighed and transferred to a Teflon beaker moistened with drops of distilled or deionized water; 5 mL of nitric acid was added until total solubility of the sample; the solution was transferred to a 100 mL volumetric flask, the volume was filled with distilled or deionized water and homogenized. Thirty-five chemical elements were found: Lithium, Beryllium, Boron, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Potassium, Titanium, Manganese, Cobalt, Nickel, Vanadium, Zinc, Rubidium, Arsenic, Iron, Copper, Strontium, Yttrium, Zirconium, Niobium, Molybdenum, Ruthenium, Cadmium, Tin, Antimony, Barium, Lanthanum, Cerium, Mercury, Lead, Thorium and Uranium. Only one of the samples contained no Nickel, Antimony and Lead; and Arsenic and Uranium were found in 2 samples. This study provided evidence of high toxicity of the IR brands, pointing out the need for better quality control of this product, in order to prevent health damage in dentists, prosthesis technicians and patients. View Full-Text
Keywords: irreversible hydrocolloids; Cadmium; toxic; contamination irreversible hydrocolloids; Cadmium; toxic; contamination
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Borges de Olival, A.R.; da Penha Junior, N.L.; Câmara, J.V.F.; Corrêa Duarte Simões, A.C.; Estruc Verbicário dos Santos, J.R.; Groisman, S. Analysis of Chemical Composition of Different Irreversible Hydrocolloids. Dent. J. 2018, 6, 37.

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