premolar Bicusp id: confi gurati on and funct ion
Bicuspid:configuration and function premolar
premo lar 1. maxillary first premolar 44 The bi ggest one of the premolar, the tip of the fac i al cusp is located di stal ly to the midline
premolar 1.maxillary first premolar 4 4 The biggest one of the premolar,the tip of the facial cusp is located distally to the midline
(1) crown 1) facial aspect a. pentagon s imilar to the can ine tip of the fac i l cusp located distally; distal ridge short and convex b a slight indentation at mesial ridge; the mes ial contact concave
（1）crown 1）facial aspect a. pentagon similar to the canine;tip of the facial cusp located distally;distal ridge short and convex b.a slight indentation at mesial ridge;the mesial contact concave
Cr own c axia ridge parallel to long axis; two devel opmental grooves d crest of contour: the cervica third of the crown, cervi cal ridge
Crown c.axial ridge parallel to long axis;two developmental grooves d.crest of contour:the cervical third of the crown,cervical ridge
Cr own 2)Lingual aspect a.ess than bucca l aspect, convex b. I inguaI cusp mes ial ly c crest of contour middle third
Crown 2）lingual aspect a.less than buccal aspect,convex b.lingual cusp mesially c.crest of contour: middle third