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Andrews six keys of occlusion

  •   For over 100 years orthodontists have always followed a classic guideline given by Angle in diagnosis – The mesiobuccal cusp of the upper first permanent molar should rest on  mesiobuccal groove of the lower first permanent molar. Even though it was genuine & accurate, how sufficient it was? It has always remained a question over these years. Even though classification have been made about malocclusion, no one gave the criteria for ideal occlusion.
  • Principles:
  • They are:-
  •   Each normal tooth type is similar in shape from one individual to another.
  •   The size of normal crowns within a dentition has no effect on their optimal angulation, inclination or prominence of their facial surface.
  •   Most individuals have normal teeth regardless of whether their occlusion is flawed or optimal.
  •   Jaws must be normal & correctly related to permit the teeth to be correctly positioned & related.
  •   Dentitions with normal teeth and in jaws that are or can be correctly related can be brought to optimal occlusal standards.

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