Abstract
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.
Highlights
IntroductionIrreversible hydrocolloid (IR) is a dental impression material that is easy to handle, allowing good reproducibility detail, as well as being inexpensive and comfortable for the patient [1].The biocompatibility tests, carcinogenic and mutagenic effects of dental materials are extremely important, since in dentistry different types of materials used for many surgical procedures may come into contact with cells of the oral mucosa, marginal gingival and/or dentin-pulp complex.Several studies have drawn attention to the relevance of checking the degree of cytotoxicity of dental materials, considering it an important step before its clinical use in the oral cavity [2,3].Many substances such as Zinc, Cadmium, lead silicate and fluorides are added into some irreversible hydrocolloids brands, with the aim of improving their physical, chemical and mechanical properties, the toxicity of these materials has become a concern [3].Dent
Several studies have drawn attention to the relevance of checking the degree of cytotoxicity of dental materials, considering it an important step before its clinical use in the oral cavity [2,3]. Many substances such as Zinc, Cadmium, lead silicate and fluorides are added into some irreversible hydrocolloids brands, with the aim of improving their physical, chemical and mechanical properties, the toxicity of these materials has become a concern [3]
The results showed that all the irreversible hydrocolloids analyzed presented toxicity [11]
Summary
Irreversible hydrocolloid (IR) is a dental impression material that is easy to handle, allowing good reproducibility detail, as well as being inexpensive and comfortable for the patient [1].The biocompatibility tests, carcinogenic and mutagenic effects of dental materials are extremely important, since in dentistry different types of materials used for many surgical procedures may come into contact with cells of the oral mucosa, marginal gingival and/or dentin-pulp complex.Several studies have drawn attention to the relevance of checking the degree of cytotoxicity of dental materials, considering it an important step before its clinical use in the oral cavity [2,3].Many substances such as Zinc, Cadmium, lead silicate and fluorides are added into some irreversible hydrocolloids brands, with the aim of improving their physical, chemical and mechanical properties, the toxicity of these materials has become a concern [3].Dent. Irreversible hydrocolloid (IR) is a dental impression material that is easy to handle, allowing good reproducibility detail, as well as being inexpensive and comfortable for the patient [1]. Several studies have drawn attention to the relevance of checking the degree of cytotoxicity of dental materials, considering it an important step before its clinical use in the oral cavity [2,3]. Many substances such as Zinc, Cadmium, lead silicate and fluorides are added into some irreversible hydrocolloids brands, with the aim of improving their physical, chemical and mechanical properties, the toxicity of these materials has become a concern [3].
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