Topic : Finding MB2 canal in maxillary first molar .

🦷 Maxillary first molars have 3 roots and 4 canals
Mesiobuccal 1 - MB1
Mesiobuccal 2- MB2
Distobuccal - DB
Palatal - P

MB 2 canal :
🤔 Existence of canal
❓- Often debated as extra canal or Primary canal.

🔬According to various studies and advent of microscopes and CBCT they are present in almost 90 % of cases .

🦷Difficult to find ,missed and reason for failure of root canal treatment.

🎯Locating the second mesiobuccal canal in Maxillary first molar!

🤔How to locate MB2?
👉Analyse the preoperative radiograph

👉 Usual location: between MB1 and Palatal canal

👉 Rule of 2:
2 mm apical to the floor of pulp chamber and 2 mm away from MB1 (in mesiopalatal direction) [However, the Range is 1.1–4.1 mm] (Kewalramani R et al; 2019)

👉 White line test (Nonvital tooth) and Red line test (Vital tooth)

PS: Don't violate the endodontic dentinal map in order to find the canal.
Do it in 2 Stages:

⏳Stage 1 : After the trapezoidal access opening, scout, prepare and irrigate all the three conventional canals MB1 , DB and Palatal canal without attempting to find MB2 during the procedure....

⌛ Stage 2: Now after preparing the conventional canals MB1, DB and P visualise the prepared orifices ...

📌DG-16 Probe or the micro- openers comes in handy for locating the canal.

📌Walk your probe on an imaginary line drawn from MB1 to Palatal.

🎯Usually one finds MB2 at 2/3rd the distance between Palatal and MB1.

📌Ultrasonic tips are also useful in locating and troughing the canal

📌Used in low power with less water

🔍Magnification definitely helps in locating the canal with ease.

⏳It takes a lot of time, patience and practice to find the canal...

"Skill comes from consistent and deliberate practice". -Shawn Allen.

👍Pls see the compiled presentation for the various tests , location, instruments and technique used for finding the MB2 .

Dr.Shobana.K

свернуть