To my opinion, there are not drawbacks of using an operative microscope in endodontics.
Moreover, the advantages are numerous and lead to a quality improvement in every endodontic practices.
You can also save your back and your eyes in comparison to magnifying glasses. However, practitioners who want to acquire a microscope have to understand that they have to practice, to use it more en more and over time, it will become easier especially when they perform RCT on mandibular teeth. Indeed, whatever the operative area, you have to use the indirect vision in the mirror with the microscope and frequently, dentists are not used to practicing like that when they implement a treatment on a mandibular tooth whithout magnifying tools.
Anyway, like other tools or technics, the daily training is the best way to make progress. I don't know one dentist who regrets to have acquired a microscope. Finally, one of the best argument is only to come into a new world with a new vision which allows to understand all our clinical difficulties but also to find the right solutions to manage it. In any case, Microscope let you having fun when you work.
I also agree with what have mentioned by Frederic, and as a general rule; you can not ensure proper management unless you treat what you can see. However with my clinical experience with microscopes, I can say that the only drawback is time consumption. Adjusting the position/magnification steps /exploration/patient movement and others may make the session relatively longer than conventionally RCTed teeth, though the professional work is much better. This can be managed by not using the microscope for every step in the endodontic treatment procedure; If you are dealing with a normal case, checking before obturation for any additional canals usually is sufficient. I also recommend using the loupes (4X + LED light) if you have a heavy schedule and/or you do not have the ability to buy a microscope.
I think the word "Operative Microscope" need some revision... Most probably you mean loupes.Coz, nowadays, a lot of controversies about using microscope in operative field.
However I think the topic is very useful to Endodontists.
I am sorry, I did not get your point. What is meant by "Most probably you mean loupes". Regarding the term "Operative/Operating microscope" mentioned in Deepak's question, according to the application of OP in endodontics, I believe the term is correct, and it is referred in many endodontic journals.
Thank you for your further explanation. what I got from the head question, that this conversation held to discuss the usage of a microscope, which usually used in Operative Dentistry field. Furthermore, the usage of such microscope is supported by few operative dentists, e.g David Clark, who recommend it to get rid from the air bubbles in shallow cavities restored with flowable composites ...Now after ur last comment, I concluded that this conversation did not aim to discuss this type of dental microscopes. Also, what made me little confused is the word "in endodontic field", because I believe that, nowadays, the use of microscope in Endo become a routine daily practice. again I apologize any confusion, an pls go ahead and complete ur very useful discussion.