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Cyclic fatigue using severely curved canals and torsional resistance of thermally treated reciprocating instruments.
Silva, Emmanuel João Nogueira Leal; Vieira, Victor Talarico Leal; Hecksher, Fernanda; Dos Santos Oliveira, Marja Ribeiro Silva; Dos Santos Antunes, Henrique; Moreira, Edson Jorge Lima.
Afiliação
  • Silva EJNL; Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil. nogueiraemmanuel@hotmail.com.
  • Vieira VTL; Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
  • Hecksher F; Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
  • Dos Santos Oliveira MRS; Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
  • Dos Santos Antunes H; Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
  • Moreira EJL; Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
Clin Oral Investig ; 22(7): 2633-2638, 2018 Sep.
Article em En | MEDLINE | ID: mdl-29392414
OBJECTIVES: To evaluate the cyclic fatigue using severely curved canals and torsional resistance of ProDesign R (Easy Equipamentos Odontológicos, Belo Horizonte, MG, Brazil), Reciproc Blue (VDW, Munich, Germany), and WaveOne Gold (Dentsply Maillefer, Ballaigues, Switzerland) reciprocating instruments MATERIALS AND METHODS: Twenty instruments of the ProDesign R (25/0.06) system, 20 instruments of the Reciproc Blue (25/0.08v) system, and 20 instrument of the WaveOne Gold (25/0.07v) system were used. Cyclic fatigue resistance was tested measuring the time to fracture and the number of cycles to fracture in an artificial stainless steel severely curved canal with 80° angle and a 3-mm radius of curvature (n = 10). Torque and angle of rotation at failure of new instruments (n = 10) were measured according to ISO 3630-1. The fracture surfaces of all fragments were examined with a scanning electron microscope. Results were statistically analyzed using one-way ANOVA and Tukey's test at a significance level of p < 0.05. RESULTS: ProDesign R instruments showed a significantly longer cyclic fatigue life than the other tested instruments (p < 0.05). Reciproc Blue showed longer cyclic life than WaveOne Gold (p < 0.05). Reciproc Blue showed the higher torsional strength, followed by WaveOne Gold and ProDesign R instruments (p < 0.05). Moreover, Reciproc Blue showed significantly higher angular rotation to fracture than ProDesign R (p < 0.05). WaveOne Gold showed intermediary results regarding angular rotation to fracture with no differences when compared to Reciproc Blue or ProDesign R instruments (p < 0.05). CONCLUSIONS: ProDesign R presented the highest cyclic fatigue resistance in severely curved canals when compared with Reciproc Blue and WaveOne Gold. However, Reciproc Blue showed the higher torsional strength overall and higher angular rotation to fracture when compared to ProDesign R. CLINICAL RELEVANCE: Despite the numerous advantages of reciprocating instruments, these instruments still have some risk of fracture during its use, especially in severely curved canals. The present study evaluated the cyclic fatigue and torsional resistance of thermally treated reciprocating instruments.
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Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Análise de Falha de Equipamento / Instrumentos Odontológicos Idioma: En Revista: Clin Oral Investig Assunto da revista: ODONTOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil

Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Análise de Falha de Equipamento / Instrumentos Odontológicos Idioma: En Revista: Clin Oral Investig Assunto da revista: ODONTOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil