Effect of movement kinematics on the cyclic fatigue resistance of nickel-titanium instruments.
Int Endod J
; 49(4): 361-4, 2016 Apr.
Article
em En
| MEDLINE
| ID: mdl-25816834
ABSTRACT
AIM:
To compare the cyclic fatigue resistance of new generation OneShape and WaveOne instruments when used with different kinematics.METHODOLOGY:
An artificial canal, made of stainless steel with an inner diameter of 1.5 mm, a 60° angle of curvature and a curvature radius of 3 mm, was used for cyclic fatigue test of new generation OneShape and WaveOne instruments. Groups were as follows (n = 20) 150°-30°, 210°-30°, 360°-30° and continuous rotation. The time to fracture was recorded in seconds, and the data were analysed statistically using a two-way anova and LSD tests (P = 0.05).RESULTS:
Cyclic fatigue resistance was significantly affected by the movement kinematics (P < 0.001). The cyclic fatigue resistance of the new generation OneShape instruments increased significantly when operated in various reciprocation motions (150° CW-30° CCW, 210° CW-30° CCW and 360° CW-30° CCW) compared with the continuous rotation mode. New generation OneShape instruments had significantly more resistance to fracture under cyclic loading than WaveOne instruments (P < 0.001).CONCLUSIONS:
When using new generation OneShape and WaveOne instruments, all the reciprocating motions (150° CW-30° CCW, 210° CW-30° CCW and 360° CW-30° CCW) resulted in extended fatigue life when compared with continuous rotation.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Titânio
/
Análise de Falha de Equipamento
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Instrumentos Odontológicos
/
Níquel
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article