Torque resistance of three different types of nickel-titanium rotary instruments / 华西口腔医学杂志
West China Journal of Stomatology
;
(6): 471-474, 2010.
Artículo
en Chino
| WPRIM
| ID: wpr-350307
ABSTRACT
<p><b>OBJECTIVE</b>To compare torsional fracture of three different types of nickel-titanium rotary instruments ProTaper, Hero642 and Mtwo by making a stimulate models in vitro.</p><p><b>METHODS</b>Through the establishment of model in vitro, compared the different time with 3 kinds of nickel titanium file in cutting-edge bound occurs, and to observe the section of fractured instruments by scanning electron microscope.</p><p><b>RESULTS</b>The resistence to torque was different from three types of nickel titanium instruments. The time to fracture of Mtwo was significantly longer than ProTaper's and Hero642's, but ProTaper's and Hero642's had no significant difference. Three kinds cross-sectional design were different, a lot of toughness nests were seen in broken surface. Most of them were ductile fracture. Time to fracture was influenced by the quality disfigurement.</p><p><b>CONCLUSION</b>The resistance to torque of Mtwo was better than ProTaper and Hero642. The lifespan was influenced by the design of cross-section. The quality disfigurement of the files reduced the resistance to flexual fatigue.</p>
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Estrés Mecánico
/
Propiedades de Superficie
/
Titanio
/
Ensayo de Materiales
/
Estudios Transversales
/
Preparación del Conducto Radicular
/
Torque
/
Aleaciones Dentales
/
Diseño de Equipo
/
Falla de Equipo
Tipo de estudio:
Estudio observacional
/
Estudio de prevalencia
/
Factores de riesgo
Idioma:
Chino
Revista:
West China Journal of Stomatology
Año:
2010
Tipo del documento:
Artículo
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