In June of 2007, we started The Endo Blog. The Endo Blog serves as an education tool and discussion forum for the everyday practice of clinical endodontics.

We share interesting cases, discuss current endodontic research, review clinical tips for endodontic treatment, and have created a library of clinical topics that will be helpful in your day to day practice of endodontics. The Endo Blog is an interactive forum as readers post comments/questions.

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Using CBCT to Diagnose the Depth of a Cracked Tooth

 One of the many uses of CBCT is to help us determine the depth of a crack - seen on the occlusal surface of a tooth, but uncertain as to how deep it goes down the root.  Obviously the deeper the crack goes below the CEJ, the poorer the long term prognosis.

This patient was mostly asymptomatic until he recently bit into something and has had pain ever since.

Periapical film

2 Cracks seen on the MMR - with staining



CBCT shows a narrow, bony defect identifying a crack in the axial (Z) view.  The sagittal (Y) view shows the depth of the crack.  A new crown would have to go past this depth to cover the crack up.  This view helps us make a determination of the restorability of the tooth.

In this case, the crack would never be completed removed or covered up by the crown making the long term prognosis poor.  CBCT allows us to make this evaluation without having to remove the amalgam filling and chase the crack - saving the patient (and us) time and money.



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