The location of the broken instrument fragment within the root canal is critical because it determines the accessibility for removal or bypass. Fragments located in the coronal or middle third of the canal are generally easier to manage, while those in the apical third pose a higher risk of procedural complications and may require alternative treatment approaches. Assessing location helps guide clinical decision-making regarding conservative attempts at retrieval or bypass, surgical intervention, or leaving the fragment in situ. Thus, understanding the fragment's precise position ensures optimal treatment planning and prognosis.

Reference: Cohen's Pathways of the Pulp, 12th Edition.