Caracterização do núcleo, aresta de corte e detecção de falhas em instrumentos de NiTi para retratamento endodôntico

Autores

  • Daniel de Almeida Decurcio Pontifícia Universidade Católica do Rio Grande do Sul, RS
  • Julio Almeida Silvaa
  • Mateus Gehrke Barbosa
  • Lucas Silva Chaves
  • Marco Antônio Zaiden Loureiro
  • Carlos Estrela

DOI:

https://doi.org/10.15448/1980-6523.2017.4.30157

Palavras-chave:

microscopia eletrônica de varredura, endodontia, retratamento.

Resumo

OBJETIVO: Caracterizar o núcleo, aresta de corte e detectar falhas em superfícies de instrumentos de níqueltitânio (NiTi) para retratamento endodôntico.
MÉTODOS: Instrumentos endodônticos (D-RaCe; ProTaper retratamento e Mtwo retratamento) foram mensurados linearmente nas áreas da aresta lateral de corte e do núcleo, além da razão entre estas medidas. Imagens em microscopia eletrônica de varredura (MEV) foram obtidas em aumento de 30 e 50 vezes. Posterior ao uso em canais simulados, estes instrumentos foram novamente analisadas frente as falhas nas superfícies ativas por MEV, em aumentos de 30 e 50 vezes, e 200 vezes. As imagens foram examinadas por três avaliadores, previamente calibrados. Os defeitos analisados incluíram: trinca, embotamento e farpa. Os dados foram tabulados para análise descritiva.
RESULTADOS: Os instrumentos estudados apresentaram resultados diferentes entre si. Os instrumentos do sistema D-RaCe apresentaram maior proporção de núcleo/aresta, enquanto os instrumentos ProTaper Retratamento mostraram a menor proporção. Todos os instrumentos apresentaram algum tipo de defeito, sendo que os instrumentos Mtwo Retratamento apresentaram dois instrumentos com defeitos.
CONCLUSÃO: Todos os instrumentos apresentaram algum tipo de falha após uso em desobturação de canais radiculares simulados. Os instrumentos do sistema D-RaCe apresentaram as maiores medidas de arestas e as menores medidas de núcleo, ao contrário do sistema ProTaper Retratamento que apresentou as menores medidas de arestas e as maiores medidas de núcleo.

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Publicado

2018-07-25

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Artigo Original