Da Max Prem Wk 7

Permanent Posterior Teeth  Premolars & molars  Crown with occlusal surface  Marginal ridges  Cusp ridges & tip with inclined cuspal planes  Occlusal table  Triangular ridges/transverse ridge

Cont. Fossa - central, triangular  Pits – (developmental)  Grooves – (developmental) marginal,    

triangular, supplemental Lobes – developmental Height of contour Contact area Cementoenamel junction

Permanent Premolars General Features  Most anterior posterior teeth  First & second  Succedaneous  Shorter crown than anterior teeth  Prominent buccal ridge  Buccal developmental depressions  Height of contour/crest of curvature  Root concavities

Maxillary Premolars #5 & #12 First  First is larger  Erupt prior to mandibular premolars  #5 – erupts 10 – 11yrs.  # 12 – erupts 10 – 12yrs.  Succedaneous - replacement for primary max 1st molar  Angular shaped crown

# ??

# 5 and #12  Longer central groove  Buccal cusp slightly longer than lingual  Bifurcated in apical 1/3 of root (1 buc. & 1 ling.)  Root trunk  Distinct mesial concavity

Cont.  Crown centered over root  Cusps of almost equal size  Four developmental lobes  Roots slight lingual & distal inclination  Proximal root concavities

Maxillary First Premolar

B

D

M

L

Facial/Buccal

Maxillary Second Premolar # 4 and #13

Second  Succedaneous replacement for primary    

max. 2nd molar Less angular Shorter central groove Single root Mesial concavity not as deep

 Maxillary Left Pre-molars  P1buccal.jpg P1lingual.jpg P1mesial.jpg P1distal.jpg P1occlusal.jpg P2buccal.jpg P2lingual.jpg P2mesial.jpg P2distal.jpg P2occlusal.jpg

Lingual

Comparison

first

second

M

D