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Unusual Anatomy

Max first premolar: While it is uncommon to see 2 canals in the first max PM, it is even rarer to see 3 canals.
According to Vertucci, 1st max PM will have 3 canals 6% of the time. In the 2nd max PM, it will have 3 canals 1% of the time.

Case 1

Here, patient presented to clinic complaining of pain on biting. Clinical diagnosis was root canal treated tooth with chronic symptomatic apical periodontis. Non-surgical retreatment was recommended and completed. Patient was asymptomatic at completion of appointment.


Case 2

Mandibular PM. As for mandibular PM, the incidence of 3 canals is even rarer. According to Baisden, it happens about 0.5% of the time.

Here we have a case of necrotic pulp with chronic suppurative apical abscess. In the pre-op radiograph the sinus tract was traced, but did not conclusively confirm the origin of the sinus tract. RCT was recommended and completed.

Notice, here one canal branches into three; a 1–3 system.


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Office Location

10251 Torre Ave, Suite 100 Cupertino, CA 95014

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Opening Hours

Mon–Fri: 8am – 5pm
Saturday: Limited by Appointment

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(408) 252-8833

Copyright © 2018-2024 Bexter M. Yang, DDS, MS and WEO Media (Touchpoint Communications LLC). All rights reserved.  Sitemap
Bexter M. Yang, DDS, MS, 10251 Torre Ave, Suite 100 Cupertino, CA 95014 | (408) 252-8833 | | 3/30/2024 | Related Terms: Endodontist Cupertino CA |