I’m a sucker for a good tooth story. Over the years I’ve noticed that one tooth story in particular tends to repeat itself the most, and it really highlights the advantages of CBCT. I call it the Weekender.


Signs of “The Weekender” Case


You might be familiar with this one in your own practice. I’m talking about the patient who had severe, out-of-their-mind tooth pain over the weekend. They took every pill in their medicine cabinet, but nothing helped. They left messages on your office phone begging you to help them or prescribe them antibiotics.

Then they finally get in your chair on Monday morning… and their tooth is feeling much better.

Sound familiar?


The Real Culprit: A Dying Nerve


You might assume that the patient took an antibiotic that did the trick, but it’s important to realize that the true villain of this story is a dying nerve. The process causes such unbearable pain that nothing alleviates the symptoms; however, once the nerve is dead, the tooth starts to feel better.

If you pay close enough attention to your patient’s tooth stories, you’ll start to notice this pattern:


First, a tooth becomes sensitive to cold, then to heat, and finally to percussion—the typical progression of tooth pain. Once a patient experiences pain from heat, you know the nerve is dying (this is also the time when they might have referred pain, and might think that a different tooth is the culprit). Once the patient notices pain from percussion, they’ll be able to localize the pain, and, since the nerve is at this point already dead or close to it, their pain level will drop.


So, if the patient reports that their pain is under control, it’s not necessarily because an antibiotic worked—it’s more likely that the nerve in the tooth died.


To make the correct diagnosis, you’ll need to make sure you understand your diagnostic tests. You’ll probably be looking for a tooth that is necrotic, doesn’t respond to cold, has any sensation to percussion (even if it’s only slight), or shows symptoms of apical periodontitis.


Note that it’s possible for you to make one diagnosis, only to have your patient get a whole other diagnosis once they see a specialist—it can change that quickly.


A Tooth Story Example


This patient experienced horrible pain for a few days, was put on Ibuprofen, Hydrocodone, and Amoxicillin, and then her pain went away. By the time she got to my office for her evaluation, she was pain-free.

It makes sense, right? I mean, it’s pretty difficult to figure out what the problem is when it’s covered up with all these medications. However, knowing that this is a very common tooth story, I really had to investigate and use all of the tools in my toolbox. And when I have a diagnostic question, I always resort to my cone beam as step one to see if it will give me any more clues into this tooth story.

At the time of the evaluation, these were the results of my diagnostic tests: All of the probings were within normal limits, and there was no pain to percussion in the quadrant. Tooth #2 felt cold, but teeth #3-5 had no response to cold.


Normal Can Be Subjective


Now, It’s really important that you understand what is “normal” for the particular patient you’re treating. Since some people don’t feel cold on their premolars, we shouldn’t assume that all three of those teeth were necrotic. It’s always a good idea to find a similar tooth under similar conditions (in this case, another first molar with a crown on it) and to see how it responds to cold—just make sure that that tooth hasn’t been root canaled before. If that tooth responds to cold, then the other first molars should also respond to cold, and you’ll know that the crown is not getting in the way of your test.


The periapical radiograph didn’t reveal much. The sinus was superimposed over the apices and so it was difficult to see if there was any endodontic pathology in the area.


Periapical radiograph


The bitewing showed that there were no opposing teeth, so I quickly disregarded the possibility of referred pain from the mandible.




This Case Shows the Advantages of CBCT


The CBCT allowed me to see the bone immediately adjacent to the roots, to check if there was any periapical pathology.


One of the biggest advantages of CBCT is that it shows me these incipient periapical radiolucencies very clearly, which means I don’t have to make the patient wait for another flareup in order to make a diagnosis and to perform treatment at a later date.


This sagittal slice showed a small lesion on the disto-buccal root.


CBCT benefits


In the axial view, you can see a lesion on the disto-buccal root and the palatal root.


Axial View


And this is another sagittal view that shows the lesion of the palatal root.


Sagittal View


And here is the final root canal.


Final root canal


The Takeaway


So the next time a patient calls you in terrible pain over the weekend, only to have the pain gone by Monday, don’t assume the problem is gone!

Proper diagnosis is such an important component of endodontics, and using a cone beam can make it easier than you might think—just one of the many advantages of CBCT. If you pay close attention, you’ll soon pick up on trends like the one in this tooth story of the Weekender and the Dying Nerve. It will make your life easier, and your patients will love you for it! Want some extra help with diagnosis? Download my free Pulpal & Periapical Diagnosis Checklist here!