Maxillary 2nd Premolar Anatomy PDF

ANATOMY OF PERMANENT Maxillary nd 2 Premolar Dr. Sandeep Gupta Oral Pathologist  The maxillary second premolar, is the 5th tooth from the midline.  The premolars are so named because they are anterior to the molars in permanent dentition.  It is also called bicuspid.  1st evidence of calcificati...

ANATOMY OF PERMANENT Maxillary nd 2 Premolar Dr. Sandeep Gupta Oral Pathologist  The maxillary second premolar, is the 5th tooth from the midline.  The premolars are so named because they are anterior to the molars in permanent dentition.  It is also called bicuspid.  1st evidence of calcification -- 1.5 to 2 yr  Enamel completed -- 6 to 7 yrs  Eruption -- 10 to 12 yrs  Root -- 12 to 14 yrs completed Dimensions (in mm) Cervico occlusal length of crown 8.5 Length of root 14 Mesiodistal diameter of crown 7 Mesiodistal diameter of crown at cervix 5 Buccolingual diameter of crown 9 Buccolingual diameter of crown at cervix 8 Curvature of cervical line mesially 1 Curvature of cervical line distally 0  Palmer’s  FDI notation -- 5 5 notation -- 15 & 25  Set -- permanent  Class -- premolar  Arch -- maxillary  Type -- second  Develop from the 4 lobs:  Three  One buccal lobs lingual lob Maxillary 1st premolar Maxillary 2nd premolar TWO CUSPS: Buccal Lingual Single ROOT Buccal aspect  The crown is roughly trapezoidal in shape.  Buccal cusp is shorter & less pointed than 1st premolar  The mesial slope of the buccal cusp is slightly shorter than the distal slope.  The distal cusp slope sometimes has a slight notch. Surface: it is convex Buccal ridge: Presence of the continuous ridge from cusp tip to cervical margin on the buccal surface Less prominent than 1st premolar. The Cervical Line ◦ Is slightly convex toward the root. The single root is tapering and the apical end may bend distally, mesially or the root may be straight. The root is usually longer than that of the maxillary first premolar and is flattened mesio-distally with a wider cervical portion. lingual aspect  The speroidal form  Surface:  lingual it is convex ridge: Presence of the continuous ridge from cusp tip to cervical margin on the lingual surface  Lingual cusp is shorter than buccal cusp  The tip of buccal cusp can seen from the lingual aspect mesial aspect  Cusps are shorter as compare to 1st premolar  Buccal & lingual cusps are nearly the same length  The cervical line: may be regular or irregular  Buccal & lingual outline & the crest of the curvature is mostly same as 1st premolar  The distance between cusp tips varies, the two cusp tips may be less closer than maxillary first premolar.  Mesial developmental depression: not present  A shallow developmental groove appears on the single tapered root distal aspect Almost same as mesial aspect, except;  The distal root depression is deeper than mesial.  Contact Points; Height of Curvature.  When viewed from the facial, the distal contact area is located more cervically than is the mesial contact area. occlusal aspect  There are two well-defined cusps buccal and lingual.  The  The larger cusp is the buccal. outline of crown is more rounded or oval  The central developmental groove is shorter & more irregular  More irregular & wrinkled occlusal surface due to multiple supplementary grooves that terminate in shallow depression.  Greater distance between cusp tips, so occlusal surface is wider buccolingually.  Right and Left: 1. Mesio-buccal cuspal slope is shorter than disto-buccal cuspal slope. 2. The distal developmental depression on root Thank You