Abstract
Aim: To investigate the influence of cervical preflaring on apical file size determination using 4 different rotary instruments. Methodology: Forty extracted human maxillary central incisors were used for the study. Access opening was done and the working length was established. Teeth were randomly divided into 4 groups namely, no preflaring (Control), Gates Glidden drills, Protaper instruments and LA Axxess burs. After apical file size determination for each tooth IAF were fixed at the WL. Teeth were sectioned transversally 1mm from the apex, with the binding file in position, analyzed & root canal & file maximum diameters were recorded for each sample. Results: LA Axxess burs produced the smallest differences between anatomical diameter & first file to bind . The major discrepancy was found in group 1, where no cervical preflaring was performed. Protaper instruments were ranked second & Gates Glidden Drills third with statistically significant results (p< 0.01). Conclusion: Cervical preflaring helps to gauge the apical diameter better and LA Axxess burs are more effective for preflaring compared to other rotary instruments.
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