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mandibular 1st premolar

#21, #28, resembles canine, bicuspid- buccal cusp and lingual cusp

buccal cusp

is the functional centric cusp

lingual cusp


two types

transverse ridge and no transverse ridge

which cusp is the largest?

the facial cusp

what anatomy does the facial cusp have?

2 developmental grooves, cusp towards mesial,

which cusp ridge is shorter than the other cups ridge in the facial aspect?

mesiobuccal cusp ridge is shorter than distobucco cusp ridge

lingual aspect

mesial lingual groove, nonfunctional ligual cusp varies in size, lingual cusp towards distal, mesial marginal ridge and lingual cusp devided by mesiolingual groove

proximal aspect

mesial crest of curvature deeper, mesiolingual developmental groove, mesial marginal ridge has extreme lingual slop, mesial develpmental groove is present between mesial marginal ridge and mesiolingual cusp. facial cusp centered over root, looks tipped toward lingual

occlusal aspect

facial cusp dominates, rounded diamond outline, mesiolingual longer, trasnverse ridge from facial to lingual cusp or not

transvers ridge on 1st premolar if

shallow central groove

if there is a very prominent central groove then there will be no

transverse ridge

1st mand premolard teh grooves are

well defined, the mesiolingual groove, central and mesial and distal grooves, Mesiofacial, mesiolingual, distofacial, distolingual, transverse, pit/fossae-mesial pit, distal pit

1st mand premolar root n pulp

is aligned to facial in mandible, bulky cone shape root,

root has what type of grooves

longitudinal grooves, deep developmental groove on mesial aspect of the root

root may deviate to


root is approx ___mm shorter than root of canine

3-4mm, 1-2 pulp horns 1 root canal



height of countour

facial in cervical 3rd, lingual in middle 3rd

amount of countour

facial is .5mm lingual is more than .5mm, 4 lobes

mand 2nd premolars

20 and 29. more equal sized cusps

mand 2 premolars have 3 types of cusps

y-type, h-type, u-type, 2 developmental grooves, distal cusps ridge is facial cups i longer


3 cusps


2 cusp


least common, 2 cusp

which cusp rdige of facial cusps is longer?

distal cusp ridge

lingual aspect 2nd premolars mand

h-type, u type have one lingual cusp, y type has two lingual cusp ml& dl...and lingual groove

Facial cusp leans towards


whole tooth tiltis to blank in jaw


mesial crest is


facial cusp slightly


u type, htype(2 cusps) 2 triangular ridges

groove central (m & D), marginal (M&D), pits fossae m & D

y types

3 cusps, grooves, central m & d, margincal m& d, lingual, pits fossae, m d central, only on central groove


single root blunt, bulk, may devate to distal, longitudinal groove. one pulp horn per cusp or 3
one root conal
larger and longer root than mand 1st

height of contour

fcat, laugh much lingual midddle third

amount of countour

f-.5mm > .5 mm

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