A tooth I treated endodontically returned with a large lesion. I pay attention to my irrigation and instrumentation protocols. I placed a post in the palatal canal of an upper first molar and a large lesion developed. What could be the cause?

Question

Doç. Dr. İsmail Davut Çapar · Accepted Answer

There can be many causes: there may be a second canal, or the apex of upper molars is often very wide, making a seal with gutta-percha impossible during filling. In such cases an apical MTA plug may be preferred. Another possibility is that a perforation or crack developed while preparing the post space.