American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics · 2012
Cytotoxicity of esthetic, metallic, and nickel-free orthodontic brackets: cellular behavior and viability.
Сравнительное исследованиеСтатьяНазвание и аннотация: Перевод в очереди
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Retamoso Luciana Borges, Luz Tatiana Blaya, Marinowic Daniel Rodrigo, Machado Denise Cantarelli, De Menezes Luciane Macedo, Freitas Maria Perpétua Mota, Oshima Hugo Mitsuo Silva
Аннотация
INTRODUCTION: In this study, we evaluated the cellular viability of various esthetic, metallic, and nickel-free orthodontic brackets.
METHODS: The sample was divided into 11 groups (n = 8): cellular control, negative control, positive control, metallic, polycarbonate, 2 types of monocrystalline ceramic, 3 types of nickel free, and polycrystalline ceramic brackets. Cell culture (NIH/3T3-mice fibroblasts) was added to the plates of 96 wells containing the specimens and incubated in 5% carbon dioxide at 37°C for 24 hours. Cytotoxicity was analyzed qualitatively and quantitatively. Cell growth was analyzed with an inverted light microscope, photomicrographs were obtained, and the results were recorded as response rates based on modifications of the parameters of Stanford according to the size of diffusion halo of toxic substances. Cell viability was analyzed (MTT assay); a microplate reader recorded the cell viability through the mitochondrial activity in a length of 570 nm. The values were statistically analyzed.
RESULTS: All tested brackets had higher cytotoxicity values than did the negative control (P <0.05), with the exception Rematitan and Equilibrium (both, Dentaurum, Ispringen, Germany) (P >0.05), suggesting low toxicity effects. The values showed that only polycarbonate brackets were similar (P >0.05) to the positive control, suggesting high toxicity.
CONCLUSIONS: The brackets demonstrated different ranges of cytotoxicity; nickel-free brackets had better biocompatibility than the others. On the other hand, polycarbonate brackets were made of a highly cytotoxic material for the cells analyzed.
METHODS: The sample was divided into 11 groups (n = 8): cellular control, negative control, positive control, metallic, polycarbonate, 2 types of monocrystalline ceramic, 3 types of nickel free, and polycrystalline ceramic brackets. Cell culture (NIH/3T3-mice fibroblasts) was added to the plates of 96 wells containing the specimens and incubated in 5% carbon dioxide at 37°C for 24 hours. Cytotoxicity was analyzed qualitatively and quantitatively. Cell growth was analyzed with an inverted light microscope, photomicrographs were obtained, and the results were recorded as response rates based on modifications of the parameters of Stanford according to the size of diffusion halo of toxic substances. Cell viability was analyzed (MTT assay); a microplate reader recorded the cell viability through the mitochondrial activity in a length of 570 nm. The values were statistically analyzed.
RESULTS: All tested brackets had higher cytotoxicity values than did the negative control (P <0.05), with the exception Rematitan and Equilibrium (both, Dentaurum, Ispringen, Germany) (P >0.05), suggesting low toxicity effects. The values showed that only polycarbonate brackets were similar (P >0.05) to the positive control, suggesting high toxicity.
CONCLUSIONS: The brackets demonstrated different ranges of cytotoxicity; nickel-free brackets had better biocompatibility than the others. On the other hand, polycarbonate brackets were made of a highly cytotoxic material for the cells analyzed.
Предметные рубрики MeSH
AluminumAnimalsBenzhydryl CompoundsBiocompatible MaterialsCarbon DioxideCell Culture TechniquesCell ProliferationCell SurvivalCeramicsChromium AlloysColoring AgentsDental AlloysDental MaterialsEsthetics, DentalFibroblastsMiceNIH 3T3 CellsNickelOrthodontic BracketsPhenolsPolycarboxylate CementTemperatureTetrazolium SaltsThiazolesTime FactorsTitaniumBisphenol A Compounds