Avaliação da remoção do hidróxido de cálcio com utilização de diferentes métodos de irrigação
The evaluation of removal of calcium hydroxide using different irrigation methods
Silva, J.M.; Cruz, H.M.; Araújo, L.M.; Pessoa, O.F.
Rev. odontol. UNESP, vol.38, n1, p.37-43, 2009
Abstract
O objetivo deste trabalho é avaliar a eficiência de remoção do hidróxido de cálcio [Ca (OH)2] do interior do canal radicular, valendo-se de diferentes métodos. Vinte e seis incisivos inferiores foram preparados com a técnica escalonada regressiva e preenchidos com Ca(OH)2 associado a soro fisiológico. As amostras foram armazenadas a 37 °C, em 100% de umidade relativa, por sete dias e foram divididas em dois grupos, de acordo com a técnica de remoção da medicação intracanal. No Grupo1 (G1): irrigação com 5 mL de hipoclorito de sódio 1%; limagem com instrumento memória por 1 minuto; irrigação com 5 mL de hipoclorito de sódio 1%; patência por 10 segundos; irrigação final com 10 mL de EDTA-T 17%. No Grupo 2 (G2), procederam-se as mesmas etapas do G1, acrescendo-se o uso do ultrassom por 1 minuto com lima #15. As amostras foram avaliadas qualitativamente em microscópio eletrônico de varredura, por meio de imagens de diferentes áreas do terço apical. De acordo com o teste de Mann-Whitney, com nível de significância de 5%, G1 não diferiu estatisticamente do G2. O teste de Friedman indicou diferenças estatisticamente significativas entre as áreas do terço apical para os dois grupos, sugerindo que à medida que se aproxima da área mais apical, menos eficaz é a remoção do hidróxido de cálcio. Os resultados mostraram que nenhuma técnica removeu completamente o Ca (OH)2 do canal radicular.
Keywords
Endodontia, hidróxido de cálcio, canal radicular
Resumo
The purpose of this study was to evaluate the efficiency of different methods of removal of calcium hydroxide [Ca (OH)2]. Twenty six inferior incisors had been prepared using the regressive technique and filled with Ca (OH)2. The samples had been stored to 37 °C in 100% of relative humidity per 7 days. The teeth had been divided in two groups in accordance with the technique of removal of the intracanal medication. In the Grupo1 (G1) – 5 mL of 1% sodium hypochlorite (NaOCl); instrumented for 1 minute; 5 mL of 1% NaOCl; patency per 10 seconds; 10 mL of EDTA - T 17%. Group 2 (G2) follows the same stages of the G1, increasing the use of the ultrasonic for 1 minute. The samples had been evaluated qualitatively in electron microscope, through images of different areas of apical third. In accordance with the test of Mann-Whitney, with level of significance of 5%, G1 does not differ from G2. The test of Friedman indicates significant differences between the areas of apical third for the two groups. Results showed that no technique removed all Ca (OH)2.
Palavras-chave
Endodontic, calcium hydroxide, root canal
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