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WORKING LENGTH DETERMINATION

WORKING LENGTH DETERMINATION

  • WORKING LENGTH DETERMINATION accessory foramen is an orifice on the surface of the root communicating with a lateral or accessory.
  • The apical constriction (minor apical diameter) is the apical portion of the root canal having the narrowest diameter. This position may vary but is usually 0.5 to 1.0 mm short of the center of the apical foramen.
  • The cementodentinal junction is the region where the dentin and cementum are united, the point at which the cemental surface terminates at or near the apex of a tooth – histologic landmark.
  • The location of the cementinodentinal junction also ranges from 0.5 to 3.0 mm short of the anatomic apex.
  • The apical constriction is the narrowest part of the canal with the smallest diameter of blood supply, thus creating the smallest wound site and best healing condition.
  • This anatomical landmark can be called the minor diameter of the canal.
  • The minor diameter represents the transition between the pulpal and the periodontal tissue, located in the range of 0.5 to 1.0 mm from the external foramen or major diameter on the root surface.

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