Methods: sixty extarcted intact maxillary molars with buccaly curved palatal roots were used in this study. Mesiodistal radiographs were first obtained for each tooth in order to visualize the angle of curvation.They were then scanned and the angle of curvation measured by Schnider rule. Teeth were mounted in wax ,with a file positioned in the palatal canal of each one,with vertical,mesial and distal angulations. Radiographs were then shown to three endodontists so they would determine exact ,over or under positioning of the file.
Results:
Reproducibility was significant in all three radiographic angulations ,but it was more significant in vertical and distal angulations. Although it is less than 0.5 mm,over positioning of the file seems to be more likely in all three angulations. root length and angle of curvation have no effect on the accuracy of different radiographic angulations.
Conclusions:
Due to the more frequent similar judgments on distal and vertical angulations by the observer ,reliability coefficient count a higher number for the above ,compared to the mesial
Angulations