Permanent maxillary second premolars

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  • 1.      Supplements the maxillary first premolar in function Less angular ,rounded crown in all aspects Single root Smaller crown cervicoocclusally Root length is as great or greater
  • 2. Not as long as that of the first premolar  Less pointed  Mesial slope is shorter than the distal slope  Buccal ridge of the crown may not be so prominent when compared with the first premolar 
  • 3.  Lingual cusp is longer making the crown longer on the lingual side
  • 4. Cusps of second premolar are shorter with the buccal and lingual cusps more nearly the same length  Greater distance between cusp tips-that widens the occlusal surface buccolingually  No developmental depression on the mesial surface of the crown as on the first premolar  Crown surface is convex instead  No deep dev. Groove crossing the mesial marginal ridge 
  • 5. Outline of the crown is more rounded or oval rather than angular  Central dev. groove is shorter and more irregular  Tendency toward multiple supplementary grooves radiating from the central groove that may extend out to the cusp ridges  Makes for an irregular occlusal surface and gives a very wrinkled appearance 