Explain canal obstruction - non-surgical endodontic, Biology

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Explain Canal Obstruction - Non-surgical Endodontic Retreatment

File work shorter than the normal apical and feel a great resistance to reach the true length

a. A retained instrument

b. a canal classification

c. blockage of natural tooth substance or foreign material (soft sticky point .. dentin mud)

d. a ledge crated itrogenically (hard)

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