For upper sixes, I usually spend half an hour preparing the three canals and the remaining time attending to the MB2. It is difficult locating its orifice most of the time and negotiating this fine canal is also a challenge. Working with an operating microscope is beneficial for this purpose. I have retreated many failed RCT of upper sixes due to neglected MB2. The case above belongs to an uncle of the referring dentist, hence additional stress for me to produce good work, but I'm glad that it didn't take too much trouble treating the MB2.
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