Figure 17: (a) Access cavity and radiograph of a lower first molar tooth three canal orifices, note that the mesio-buccal and mesio-lingual canals are found approximately the same distance from the midline (mesial to distal) of the tooth (yellow line). | British Dental Journal

Figure 17: (a) Access cavity and radiograph of a lower first molar tooth three canal orifices, note that the mesio-buccal and mesio-lingual canals are found approximately the same distance from the midline (mesial to distal) of the tooth (yellow line).

From: A practical guide to endodontic access cavity preparation in molar teeth

Figure 17

(b) Access cavity and radiograph of a lower first molar with four root canals, note that the buccal and lingual canals can be found on either side of the mesial to distal mid-line (yellow line) of the tooth. If an imaginary line is joined between the buccal and lingual canal entrances (yellow dots) it will intersect the mesial-to-distal mid-line at right angles. The distal canal orifices are closer to the midline than their mesial counterparts

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