This case was referred by another practitioner who attempted to locate the canal, but couldn’t find it. The practitioner had perforated palatally in an effort to search for the canal. The perforation was supra-crestal and was sealed with Glass Ionomer. When viewed under the microscope, one can clearly see the calcified portion of what used to be the canal at one time. Once we are able to differentiate between the calcified canal and the adjacent dentine, it becomes predictable to drill apically to locate the canal.

Here’s a small video of the same case