Zipping and Apical Transportation in Endodontics?

Zipping is defined as the apical transportation of a curved canal caused due to improper shaping technique.
Elbow is the narrowest portion of the zipped canal. A zipped canal is apical to elbow and usually obturation ends at the elbow
Apical canal transportation is moving the position of canal’s normal anatomic foramen to a new location on external root surface
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