LAWS OF ACCESS OPENING

Written by : Dr. Urusa I Inamdar

Krasner and Rankow’s Laws of Access Opening

  • Law of centrality : The floor of the pulp chamber is always located in the center of the tooth at the level of the CEJ .
  • Law of concentricity : The walls of the pulp chamber are always concentric to the external surface of the tooth at the level of the CEJ .
  • Law of the CEJ : The distance from the external surface of the clinical crown to the wall of the pulp chamber is the same throughout the circumference of the tooth at the level of CEJ .
  • Law of symmetry 1 : Except for maxillary molars , the orifices of the canals are equidistant from a line drawn in a mesiodistal direction through the pulp chamber floor .
  • Law of symmetry 2 : Except for maxillary molars , the orifices of the canals lie on a line perpendicular to a line drawn in a mesiodistal direction across the center of the floor of the pulp chamber .
  • Law of color change : The color of the pulp chamber floor is always darker than the walls .
  • Law of orifices location 1 : The orifices of the root canals are always located at the junction of the walls and the floor .
  • Law of orifices location 2 : The orifices of the root canals are located at angles in the floor – wall junction .
  • Law of orifices location 3 : The orifices of the root canals are located at the terminus of the root developmental fusion lines .
Law of Centrality
Law of concentricity
Law of symmetry
Orifice location

References:

  • Dental notes
  • Grossman’s Endodontic Practice (13th edition)
  • Google search

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