Torsional behaviour of Reciproc and Reciproc blue instruments associated with their martensitic transformation temperatures.
Int Endod J
; 52(12): 1768-1772, 2019 Dec.
Article
em En
| MEDLINE
| ID: mdl-31306497
ABSTRACT
AIM:
To compare the martensitic transformation temperatures and torsional resistance behaviour of classic M-Wire Reciproc and Reciproc blue files (VDW, Munich, Germany).METHODOLOGY:
M-Wire classic Reciproc R25 and Reciproc blue R25 instruments were used. Transformation temperatures were determined by differential scanning calorimetry (DSC-DSC 60, Shimadzu, Kyoto, Japan). Three samples with approximately 20 mg of each system were cooled to -120 °C and then heated to 100 °C and then cooled to -100 °C at a rate of 10 °C min-1 . The maximum torque values and angular deflection until fracture of new instruments (n = 10) were measured according to ISO 3630-1. Results were analysed statistically using the Student's t-test at a significance level of P < 0.05.RESULTS:
DSC results revealed the absence of martensitic transformation for Reciproc instruments in the temperature range analysed. In both systems, the instruments were composed of a mixture of R-phase and austenite at room temperature. After torsional tests, Reciproc blue had significantly lower values for mean maximum torque at rupture (P < 0.05), although the angular deflection values were significantly higher than the Reciproc classic group (P < 0.05).CONCLUSIONS:
Both Reciproc and Reciproc blue instruments were composed of a mixture of R-phase and austenite. Reciproc Blue instruments had a greater angle of rotation to fracture but a lower torque to failure than M-Wire Reciproc instruments.Palavras-chave
Texto completo:
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Bases de dados:
MEDLINE
Assunto principal:
Preparo de Canal Radicular
/
Instrumentos Odontológicos
Tipo de estudo:
Risk_factors_studies
Limite:
Humans
País/Região como assunto:
Europa
Idioma:
En
Revista:
Int Endod J
Ano de publicação:
2019
Tipo de documento:
Article