Edition V02N01 | Year 2012 | Editorial Original Article | Pages 23 to 27
Introduction: The aim of this study was to compare the effectiveness of two rotary systems in calcium hydroxide removal from root canal walls. Methods: A total of 44 distobuccal root canals of human maxillary molars with curvatures between 15° – 25° were randomly divided into two groups of 20 canals each and two control groups. Specimens in group A were instrumented with RaCe rotary system and in group B with Mtwo rotary system up to #35 (4%). Canals were rinsed by 5 ml of 2.5% NaOCl between each instrument and #10 K-file was used as patency during filling. Calcium hydroxide paste was placed in the canals and after incubation; it was removed from canals by means of master apical rotary and NaOCl in each group. Roots were split longitudinally and the remnants were evaluated by stereomicroscope at three levels using a scoring system. Data were statistically analyzed with ANOVA test. Results: No significant difference was found in all groups in both RaCe and MTwo systems (p>0.05). Sum of the acceptable scores was found 53.6% in RaCe and 51.3% in Mtwo group, respectively. Conclusion: None of the canals was totally free of calcium hydroxide remnants. Although there was no significant difference between groups, there was a slightly better clinical impression of cleanliness with Mtwo system as to calcium hydroxide removal.