Electrochemical dissolution is a method in which fluoridated solution in direct contact with the fractured instrument receives an electrical current that speeds up fragment dissolution. The aim of this study was to assess the integrity of dentinal walls during the electrochemical dissolution of fractured rotary endodontic instruments in extracted human teeth. Forty‐five human mandibular incisors subjected to the electrochemical dissolution process using fluoride solution with low NaCl concentration (LC group: NaF 12 g/L + NaCl 1 g/L, pH = 5.0), fluoride solution with saturating NaCl concentration (SC group: NaF 12 g/L + NaCl 180 g/L, pH = 5.0) and distilled water (control group) were evaluated. For each group, 15 incisors were submitted for the scanning electron microscopy (SEM) evaluation. The roots were sectioned longitudinally; each hemisection was analyzed (n = 30), and energy‐dispersive spectroscopy (EDS) was performed. The amount of dentinal tubule openings was analyzed by SEM. Statistical analyses were performed. The test solutions did not alter the amount of dentinal tubule openings when compared with the control group. No Ni or Ti was impregnated into the dentinal tubules after electrochemical techniques. The dentinal structure remained unchanged following the electrochemical dissolution method.
O objetivo deste trabalho foi revisar a literatura sobre os graus de alterações de cores dentárias causadas por tetraciclina. Foi realizada uma busca na literatura nas bases de dados PubMed e Bireme, sendo encontrados 23 artigos no período compreendido entre 2012 a 2017, utilizando os descritores estética dental (dental esthetics), tetraciclina (tetracycline) e pigmentação (pigmentation). Foram selecionados seis artigos com base em título/Resumo. Os dentes que apresentam uma maior alteração de cor provocada pela tetraciclina são os anteriores. Nestes elementos, o terço cervical mostra uma alteração cromática mais intensa. As pigmentações são classificadas em graus I, II, III, IV. O grau I apresenta coloração amarelo claro, castanho ou cinza claro, uniformemente distribuída na coroa dental. O grau II apresenta aspecto amarelo ou cinza em vários tons e não apresenta faixas. O grau III apresenta uma coloração cinza escuro, com formação de bandas principalmente na cervical. O manchamento de grau IV é bastante severo, com faixas escuras. A associação entre diferentes técnicas de clareamento vital deve ser considerada a primeira escolha em tratamentos de discromatismo dental por tetraciclina. Contudo, nem todos os casos são sensíveis a este tratamento, podendo haver o emprego de técnicas restauradoras invasivas para um resultado final satisfatório.Palavras-chave: Pigmentação. Estética Dental. Tetraciclina
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