IADR Abstract Archives
The Role of Instrument Size on Calcium Hydroxide Removal
Methods: Fourty-eight extracted human single-rooted maxillary incisors were instrumented up to master apical file #40 and irrigated with 2ml 2,5% NaOCl between each file. Teeth were divided into two groups, in Group 1, roots were dressed with Ca(OH)2+saline, and in Group 2, roots were dressed with SurePaste. Then groups were divided into three subgroups and after seven days Ca(OH)2 was removed with #40, #45 and #50 H-type hand files and 10ml 17% EDTA solution. The teeth were sectioned longitudinally along the length of the instrumented canals and monitored by stereomicroscopy. Residuel Ca(OH)2 was measured with Comef 4,3 software program in the cervical, middle and apical canal thirds. Statistical analysis was performed using the One Way Anova test at the 5% level of significance.
Results: Regardless of Ca(OH)2 type, #40 H-type hand file removed significantly less Ca(OH)2 than #45 and #50. Considering SurePaste and Ca(OH)2+saline, there were no differences in apical and middle thirds but in cervical third Ca(OH)2+salin was removed significantly better than SurePaste. Regardless of removal techniques, middle third was cleaned significantly better than apical and cervical canal thirds. Considering total residual calcium hydroxide, maximum amount of remnant was observed in combination of SurePaste and #40 H type hand file.
Conclusions: None of the techniques removed Ca(OH)2 from root canal completely. Maximum amount of remnant was observed in combination of SurePaste and #40 H type hand file.