SciELO - Scientific Electronic Library Online

vol.27 issue1In vitro fracture resistance of glass-fiber and cast metal posts with different designsIn vitro evaluation of filling of lateral root canals with different filling materials by using digital radiography author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista Odonto Ciência

On-line version ISSN 1980-6523


DRAGO, Mariana Aleluia; PEREIRA, Rosana de Souza  and  SCHETTINO JUNIOR, Miguel Ângelo. Evaluation of the lengths and angles of the tips of rotatory files in root canal preparations. Rev. odonto ciênc. [online]. 2012, vol.27, n.1, pp.58-63. ISSN 1980-6523.

PURPOSE: To detect changes in the angles and lengths of the tips of rotary nickel-titanium files after use. METHODS: Forty human teeth were prepared with eight sets of rotary ProTaper® Universal nickel-titanium files with a length of 25 mm and rotation of 350 rpm. The files were evaluated in a scanning electron microscope (SEM) at three different times: Group A - before use; Group B - after using each file in the preparation of three molars; and Group C - after using each file in the preparation of five molars. The length of the tip was determined by measuring the length of a straight line drawn parallel to the file axis, from the apex of the tip to its posterior border. The SEM software provided the angle measurements. Data were analyzed by using paired t-tests and Wilcoxon tests. RESULTS: There were no differences between the groups for the S1 file. There was a decrease in length when the F2 file was used to prepare three and five molars, whereas decreases in length were seen when F5 files were used to prepare three or five molars. CONCLUSION: The results suggest that the tips of the rotary instruments showed significant changes in length and angle even with relatively low use.

Keywords : Dental files; Endodontics; molar.

        · abstract in Portuguese     · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License