Hemijska industrija 2011 Volume 65, Issue 6, Pages: 697-706
https://doi.org/10.2298/HEMIND110627056K
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In vitro examination of oral tissue conditioners potential toxicity
Krunić Nebojša (Clinic of Dentistry, Faculty of Medicine, Niš)
Nikolić Ljubiša (Faculty of Technology, Leskovac)
Kostić Milena (Department of Prosthodontics, Clinic of Dentistry, Faculty of Medicine, Niš)
Najman Stevo (Institute of Biomedical Researches, Faculty of Medicine, Niš)
Nikolić Vesna (Faculty of Technology, Leskovac)
Najdanović Jelena (Institute of Biomedical Researches, Faculty of Medicine, Niš)
The oral tissue conditioners are applied temporarily to the gingival surface
of a denture for the purpose of reconditioning the abused denture supporting
tissues, allowing them to return to a normal, healthy state. According to
chemical composition they can be classified into methacrylic and silicon
conditioners. The objective of this research was to examine the potential
toxicity of one, seven and thirty day extracts of different concentrations.
Different effective concentrations (5, 12.5, 25 and 50%) of two silicone and
four methacrylic conditioners extracts were used after extraction period of
one, seven and thirty days. Amount of toxic substances and dynamics of their
release were monitored by high-pressure liquid chromatography (HPLC). HPLC
analysis could not be applied to the silicone conditioners because they
consist of polymeric and inorganic 19 substances. Evaluation of cell
proliferation, as cytotoxic parameters, was done by Mosmann’s MTT assay based
on reduction of yellow tetrazole
(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide - MTT) to
purple formazan by mitochondrial succinate dehydrogenase of metabolic active
cells. With increasing of extraction period, the amount of released potential
toxic substances increased. The cytotoxicity of tested materials
significantly increased with extract concentration increase and duration of
extraction period. To improve the biological characteristics of mobile
dentures relined by soft materials, soaking in water the day before insertion
into patient’s mouth was recommended. Silicone conditioners showed less
cytotoxicity compared to the methacrylic conditioners, so they are more
appropriate for daily dental practice.
Keywords: cytotoxicity, oral tissue conditioners, MTT assay, HPLC