Fig.5 A new small X-ray taken when the patient developed severe pain 14 days after cleaning.  Without help of drawing, you may notice the root tip abscess, the nerve loop and a channel between them. If you cannot, see Fig. 6 for the abscess (yellow), channel (blue) and loop (pink).

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Xin Wei, DDS, PhD, MS 1st edition 03/24/2013, last revision 03/24/2013