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Crack or mesial canal - Courtesy ROOTS

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credited for the individual posts where they are -
From: Thomas Shimko
Sent: Thursday, November 12, 2009 3:45 PM
Subject: [roots] Crack or missed canal ?

A RCT on tooth #33 I did about 6 months ago. Now became sensitive 
to percussion  tapping in a distal point. Couldn’t see nothing on 
x-ray. As his #37 that I treated  at the same time is also sensitive 
to percussion I did a CbCT of both teeth.  Can you please tell me 
what is it that I see in tooth #33  a L canal that I missed or a 
crack ? I don't have a scope at that practice - Thomas

Number 1...I would be looking for a second canal.
Number 2 ....Cracks don't show up on x rays....unless you get the 
         right angle
Number 3 ... Get a've got CbCT...   Molar Del Sud

Thanks for the answer,

But you must be joking, I don't have a cbCT and I will never have L 
(the economics  in Israel make root canals non profitable – that's why
we are #1 in the world in the number of implants). I sent him to a 
centre to have the scan done. I got the results on a cd and that's 
how I checked them. Cracks do show on cbCT, this is not a 2D x-ray. 
I have shown just the right angle to see the big void that is directly
behind the main canal. I am thinking:

1.       Somehow this is a portion of main canal I didn't clean&shape
2.       A second L canal
3.       Crack/Fracture

Wanted to hear someone that has some experience with CT's as I don'’t 
have almost any.

I have a scope in the Haifa office, no way this guy will ever buy one 
L But I can  continue dreaming - Thomas

I don't understand why people are buying these things...I still like 
microscope and light... I could be corrected very shortly - Molar Del Sud

To do more implants of course... And on the sideways it's a great endo 
diagnostic tool - Thomas
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