General Information

This case shows a mesial root with a three canals in the apical third.  The distal root has an apical bifurcation.

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Four canal molar with bifurcation in apical third of palatal canal.

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Three canaled upper first premolar.

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Two canaled lower first incisor.  40% of these teeth have two canals but only 2-3% have separate apical foramina.

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Despite previous root canal treatment and apicoectomy, the mesial root was still failing.  The tooth was retreated non-surgically only, finding a third mesial canal.

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A separated rotary file in the apical third beyond the curvature was removed prior to retreatment.

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Upper first molar with five canals - two mesiobuccals, two palatals and two distobuccals (which joined early to form one canal).

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A previously started treatment with separated file blocking the mesiobuccal canal in a necrotic case.  The file was removed and root canal treatment completed.