Análisis de la fatiga cíclica de los instrumentos mecanizados de Endodoncia IV, Semestre A 2017.

Abstract

Introduction: Teaching the use of mechanized systems in undergraduate students is controversial; however, several studies have shown that such learning is safe for students with little clinical experience. The objective is to determine the prevalence of file fractures as a consequence of cyclical fatigue in clinical cases performed by the undergraduate students from ¨¨Universidad Católica Santiago de Guayaquil¨¨. Materials and methods: We worked with 23 students from 4th year of undergraduate who made some of their clinical cases with mechanized systems. The files which could present a possible fracture will be analyzed using scanning electron microscope; prior to that, a pilot test was done in order to have a comparative image and determine which fracture type might be presented. Results: The group of 23 undergraduate students who were part of this analysis performed during the investigation period 59 clinical cases using mechanized systems. There was no fracture of nickel-titanium files reported; however a fracture of a manual file was presented. Discussion: The absence of fractures of mechanized files in the study group could be related to the fact that no student used the same file within more than 4 teeth; in addition to that, most of the pieces worked didn’t present marked curvatures. According to the results obtained in the present research work, it could be verified that teaching the use of mechanized systems in undergraduate students is safe and can be carried out.