Failure of ProTaper rotary Ni-Ti instruments used by undergraduate students
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Failure of ProTaper rotary Ni-Ti instruments used by undergraduate students

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Failure of ProTaper rotary Ni-Ti instruments used by undergraduate students

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dc.contributor.author García Font, Marc es
dc.contributor.author Duran Sindreu, Fernando es
dc.contributor.author Morello Castro, Sergio es
dc.contributor.author Mercadè Bellido, M. es
dc.contributor.author Bueno Martínez, Rufino es
dc.contributor.author Roig Cayón, Miguel es
dc.date.accessioned 2014-05-21T12:44:52Z
dc.date.available 2014-05-21T12:44:52Z
dc.date.issued 2012 es
dc.identifier.uri http://hdl.handle.net/10550/35276
dc.source García Font, Marc ; Duran Sindreu, Fernando ; Morello Castro, Sergio ; Mercadè Bellido, M. ; Bueno Martínez, Rufino ; Roig Cayón, Miguel. Failure of ProTaper rotary Ni-Ti instruments used by undergraduate students. En: Journal of Clinical and Experimental Dentistry, 2012, Vol. 4, No. 4: 199-203 es
dc.subject Odontología es
dc.subject Ciencias de la salud es
dc.title Failure of ProTaper rotary Ni-Ti instruments used by undergraduate students es
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::CIENCIAS MÉDICAS es
dc.description.abstractenglish Objective: To evaluate the effect of number of uses, angle and radius of curvature and type of instrument on the fracture of ProTaper rotary instruments when used by undergraduate students. Study design: Three hundred and seventy-six molars, with a total of 1114 root canals, extracted were instrumented by undergraduate students using ProTaper instruments according to the manufacturer´s recommendations. When fracture occurred, data were collected concerning the number of uses, type of instrument, level of fracture, angle and radius of curvature. ANOVA test were used to determine the influence of type of instrument in the incidence of instrument fracture. Logistic regression model was used to determine the influence of number of uses, angle and radius of curvature in the incidence of instrument fracture. Significance was set at p< 0.05. Results: A total of 37 Ni-Ti rotary instruments fractured during the treatment. Fracture occurred in 9.84% (37/376) of the teeth treated and 3.32% of the canals prepared with Ni-Ti rotary instruments (37/1114). A decrease in the radius of curvature of the canal significantly increased the likelihood of fracture (p=0.0001). Instrument fracture significantly increased as the number of uses increased (p=0.0037). No significant differences were found between the 6 types of ProTaper instruments (p=0.8). A reduction in the angle of curvature did not produce a significant decrease in the incidence of instrument separation (p=0.08). Conclusions: The results of this study imply that instrument fracture is linked to radius of curvature and number of uses. es

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