Which of the following is the LEAST important factor when deciding to refer an endodontic case to a specialist?

Correct answer: C. Mesial inclination of the molar

• A. IS important. Severe dilaceration means the canal changes direction abruptly. Files cannot negotiate the curve without pre-curving and specialised technique, and the risk of ledging, transportation and strip perforation rises sharply.
• B. IS important. A calcified canal may be impossible to locate or negotiate without magnification, ultrasonics and endodontic training. Perforation risk while hunting for the orifice is substantial.
• C. CORRECT — this is the least important. A mesially inclined molar is an ACCESS-ANGLE inconvenience, not an anatomical or physiological barrier. It changes where you stand and how you angle the handpiece, and it may require a modified rubber dam clamp, but the canal system itself is normal and instrumentable by a general dentist.
• D. IS important. Failure to achieve profound anaesthesia — classically in a mandibular molar with irreversible pulpitis — often signals the need for supplemental intraosseous or intrapulpal techniques the generalist may not be equipped to deliver.

Note: Ranking of referral triggers: inability to anaesthetise > calcification > dilaceration > tooth position. Position affects convenience; the other three affect whether the treatment can be completed at all.