Abstract
Aim: The aim of this study was to investigate the frequency of second mesiobuccal canal in maxillary first and second molars. Materials and Methods: Maxillary fifty first molars and fifty second molars were collected and embedded into plaster blocks. The teeth were photographed digitally from the occlusal aspect using a stereomicroscope under standard (×8) magnification. The occlusal portions of crowns were then sectioned at cement–enamel junction with slow-speed diamond disk. To gain straight line visibility, overhung dentin over the canal orifices was removed with safe-tip diamond bur. Once again, the teeth were photographed from their occlusal aspect under the same magnification and exposure conditions. Results: MB2 canals were detected 76% and 64% in first and second molars, respectively.
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