Alterações morfológicas em instrumentos rotatórios de níquel titânio protaper®, analisados por MEV: efeito da implantação de íons nitrogênio

Autores

  • Alex Niederauer Becker Federal University of Santa Maria
  • Elias Pandonor Motcy de Oliveira Federal University of Santa Maria
  • Ruth Hinrichs Federal University of Rio Grande do Sul
  • Marcos Antônio Zen Vasconcellos Federal University of Rio Grande do Sul
  • Carlos Frederico Brilhante Wolle UNIFRA

DOI:

https://doi.org/10.15448/1980-6523.2014.2.13046

Palavras-chave:

Endodontia, Microscopia Eletrônica de Varredura, níquel-titânio

Resumo

Objetivo: O presente estudo analisou, através do Microscópio Eletrônico de Varredura [MEV], as alteraçõesmorfológicas de instrumentos rotatórios ProTaper SX, submetidos à implantação de íons de nitrogênio.
Métodos: Foram utilizados trinta instrumentos ProTaper SX divididos em três grupos de 10 instrumentos cada. O grupo A foi submetido a uma dose de 1,0×1017 íons de nitrogênio/cm² e energia de 100 KeV. O grupo B foi
submetido a uma dose de 1,0×1017 íons de nitrogênio/cm² e energia de 200 KeV. O grupo C foi composto por dez instrumentos não submetidos ao processo de implantação iônica. Cada lima instrumentou cinco blocos de canais simulados de resina acrílica, com a técnica Brushing Motion. Todos os instrumentos SX foram analisados no Microscópio Eletrônico de Varredura antes do uso, após 60 s e 300 s de uso.
Resultados: A perda de material e a distorção foram estatisticamente similares em todos os grupos. Um instrumento do grupo A, um instrumento do grupo B e três instrumentos do grupo C fraturaram durante o uso.
Conclusão: A Implantação Iônica de íons de nitrogênio melhorou moderadamente o desempenho dos instrumentos ProTaper SX. Instrumentos implantados apresentaram melhores resultados do que o grupo controle, sem diferença estatisticamente significativa.

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2015-08-13

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