chapter 10 mand premolar

what is the calcification age for mand 1st premolars

1.75-2 year

what is the enamel completion age for mand 1st premolars

5-6 years

what is the eruption age for mand 1st premolars

10-12 years

what is the root completionage for mand 1st premolars

12-13 years

what is the calcification age for mand 2nd premolars

2.25-2.5 years

what is the enamel age for mand 2nd premolars

6-7 years

what is the eruption age for mand 2nd premolars

11-12

what is the root completion for mand 2nd premolars

13-14

T or F? mand 2nd premolars can also be called bicuspids

False

what do the mand premolar crowns tilting lingually from the proximal view create

curve of wilson

T or F? mandibular premolars resemble eachother

False

where are there developmental depressions on the mand 1st premolars

MB and DB

what is the shape of the root cross section

ovoid

the lingual of the mand 1st premolars have a ___ developmental groove

mesial-lingual

what shape is the mesial surface of the mand 1st premolars

rhomboid

where is the buccal cusp tip located in relevance to the root

centered or slightly buccal

what angluation and direction is the transverse ride on the occlusal surface

45 and parallel to mesial marginal ridge

the marginal ridge on the distal surface of the mand 1st premolars is not as ________

steep

the distal contact location of the mand 1st premolar is ________ to the mesial contact and broader

similar

the occlusal surface of the mand 1st premolars has a ______ L triangular ridge and a ________ B triangular ridge

small, large

T or F? from the occlusal view, the marginal ridges are at the same level on the mand 1st premolars

True

T or F? from the occlusal view, the contacts are at the same level and broad

True

which direction does the ML cusp tip on the occlusal view of mand 1st premolars

mesial

which direction is the mesial fossae

linear

what direction is the distal fossae

circular

T or F? mand 1st premolars may have a crescent shaped D developmental groove

True

what surface of the mand 2nd premolars resemble the 1st

buccal

what is the most common number of lingual cusps and how many cusps are there total

2, 3

what does the occlusal surface of the mand 2nd premolars resemble

grinding

T or F? the buccal cusp is centered on mand 2nd premolars on the buccal surface

True

the lingual groove of the mand 2nd premolars is offset to the _________

distal

T or F? the buccal cusp is centered on mand 2nd premolars on the mesial surface

False

is the DL cusp visible on the mesial surface of the mand 2nd premolars

no

which direction is the marginal ridge going on the mesial surface of mand 2nd premolars

horizontal

T or F? the contact is larger and ovoid B to L on the distal surface of the mand 2nd premolars

True

for the mand 2nd premolars distal view: the distal marginal ridge is more ______ AND you can see _____ _____ cusps

cervical, all 3

T or F? mand 2nd premolars may be congenitally missing

True

T or F? although it is rare, root bifurcation can occur on mand 2nd premolars

True

how many cusp does the U type have

2

what defining feature does the H and U type cusps have

transverse ridges

how many cusps does H type have

2

how many cusps does the Y type have

3

what is the defining feature of the Y type cusps

no transverse ridges