Deciduous Molars

Question 1

In the primary maxillary first molar, where is the widest measurement?

Answer 1

at the contact areas

Question 2

T or F:

in the primary maxillary first molar, the measurement at the cervix is about 2 mm less than opposing teeth

Answer 2

true

this makes the tooth look narrower at the cervix than the permanent

Question 3

T or F:

in the primary maxillary first molar, the occlusal line is scalloped with a definite cusp form

Answer 3

false

while it is scalloped, it does NOT have a definite cusp form

Question 4

T or F:

in the primary maxillary first molar, the buccal surface has deep buccal grooves

Answer 4

false

the buccal surface is smooth, with very little evidence of buccal groove

Question 5

T or F:

the primary maxillary first molar is larger than the second molar in all dimensions

Answer 5

false

it is smaller than the second molar in all dimensions

Question 6

T or F:

the primary maxillary first molar’s size and shape makes it appear to be a combination of molar and premolar

Answer 6

true

Question 7

T or F:

the primary maxillary first molar has blunt roots with a narrow spread

Answer 7

false

roots are slender, long, with a wide spread

Question 8

in the primary maxillary first molar, is the distal root longer or shorter than the mesial root?

Answer 8

shorter

Question 9

in the primary maxillary first molar, where does the bifurcation of the roots start?

Answer 9

almost at the cervical line, showing very little root trunk

Question 10

in the lingual view of the primary maxillary first molar, where does the crown converge?

Answer 10

lingually

Question 11

in the primary maxillary first molar, what is the most prominent cusp?

Answer 11

mesiolingual cusp; distolingual cusp is poorly defined

Question 12

in what view can all three roots be seen in the primary maxillary first molar?

Answer 12

the lingual view

Question 13

T or F:

from the mesial view, the primary maxillary first molar is wider at the cervical third than at the occlusal third

Answer 13

true

Question 14

T or F:
from the mesial view, the mesiobuccal cusp of the primary maxillary first molar is longer and sharper than the mesiolingual cusp

Answer 14

false

the mesiolingual cusp is longer and sharper than the mesiobuccal cusp

Question 15

T or F:

from the mesial view of the primary maxillary first molar, the cervical line will curve a little to the occlusal

Answer 15

true

Question 16

what is a major identifier of the primary maxillary first molar from the mesial view?

Answer 16

there is a large convexity on the buccal surface at the cervical third

Question 17

from the mesial view of the primary maxillary first molar, which root is hidden behind the mesiobuccal root?

Answer 17

distobuccal root

Question 18

describe characteristics of the lingual root in the primary maxillary first molar

Answer 18

it is long, slender, and curves sharply in the buccal direction at the middle 1/3

Question 19

from the distal view, is the crown of the primary maxillary first molar more narrow distally or mesially?

Answer 19

distally, and it tapers a lot to the distal

Question 20

in the primary maxillary first molar, is the prominent bulge seen in the distal view?

Answer 20

no

Question 21

from the occlusal view, which permanent tooth does the primary maxillary first molar most resemble?

Answer 21

maxillary first premolar

Question 22

T or F:

from the occlusal view, the primary maxillary first molar’s crown converges distally to lingually

Answer 22

false

it converges lingually to distally

Question 23

T or F:
from the occlusal view, the primary maxillary first molar will have a central fossa with a mesial triangular fossa, small mesial pit

Answer 23

true

Question 24

in the primary maxillary first molar, what feature connects the central fossa to the mesial triangular fossa?

Answer 24

sulcus

Question 25

T or F: from the occlusal view, in primary maxillary first molars, there may be an oblique ridge going from the mesiolingual to the distobuccal

Answer 25

true

Question 26

T or F: from the occlusal view, the primary maxillary first molar may have a distal developmental groove outlining a distolingual cusp

Answer 26

true

Question 27

T or F: | from the buccal view, the primary maxillary second molar resembles a permanent first molar

Answer 27

true | but it is smaller

Question 28

T or F: | in the primary maxillary second molar, the two buccal cusps vary in size and are less developed than in the first molar

Answer 28

false | they are close to the same size and are more developed than the first molar

Question 29

from the lingual view of the primary maxillary second molar, how many cusps are seen and what are their names?

Answer 29

3 cusps 1) mesiolingual cusp (large and well developed) 2) distolingual cusp (well developed) 3) supplemental cusp aka tubercle of carabelli

Question 30

T or F: in the lingual view of the primary maxillary second molar, the suppelemental cusp (tubercle of carabelli) may be missing. In this case there may only be a dimple.

Answer 30

true

Question 31

in the lingual view of the primary maxillary second molar, what is present between the two lingual cusps?

Answer 31

developmental groove

Question 32

how many roots can be seen from the lingual view of the primary maxillary second molar?

Answer 32

all three roots; lingual root is largest and thickest

Question 33

from the mesial view, the primary maxillary second molar's crown looks short. Why?

Answer 33

due to its thickness buccolingually

Question 34

T or F: in the mesial view, the primary maxillary second molar's cervical line has little curvature and is mostly straight across

Answer 34

true

Question 35

In the mesial view of the primary maxillary second molar, the mesiobuccal root is broad and flat. What width of the root trunk is it?

Answer 35

about 2/3

Question 36

T or F: in the mesial view of the primary maxillary second molar, the lingual root has about the same curvature as that of the first primary molar

Answer 36

true

Question 37

T or F: | in the mesial view of the primary maxillary second molar, the mesiolingual cusp is just below the bifurcation

Answer 37

true

Question 38

in the primary maxillary second molar, is the distal measurement more or less than the mesial measurement?

Answer 38

less

Question 39

from the distal view of the primary maxillary second molar, is the point of bifurcation of the roots more apical or cervical?

Answer 39

more apical; it is also more centered above the crown compared to the mesial

Question 40

from the occlusal view, what permanent tooth does the primary maxillary second molar resemble?

Answer 40

permanent first molar

Question 41

what shape is the primary maxillary second molar from the occlusal aspect?

Answer 41

rhomboidal

Question 42

name the 5 cusps of the primary maxillary second molar seen from the occlusal aspect

Answer 42

mesiobuccal, distobuccal, mesiolingual, distolingual, and the tubercle of carabelli

Question 43

T or F: in the occlusal view of the primary maxillary second molar, the buccal surface is quite flat, with a developmental groove between cusps

Answer 43

true

Question 44

T or F: | in the occlusal view of the primary maxillary second molar, the central fossa has a central pit

Answer 44

true

Question 45

in the occlusal view of the primary maxillary second molar, the mesial triangular fossa is just distal to which marginal ridge?

Answer 45

the mesial marginal ridge

Question 46

is a central groove and buccal developmental groove seen from the occlusal aspect of the primary maxillary second molar?

Answer 46

yes

Question 47

T or F: | from the occlusal view of the primary maxillary second molar, the oblique ridge is flat

Answer 47

false | it is prominent

Question 48

in the occlusal view of the primary maxillary second molar, the distal triangular fossa is just mesial to which marginal ridge?

Answer 48

the distal marginal ridge

Question 49

in the occlusal view of the primary maxillary second molar, what does the distal groove go between?

Answer 49

it goes between the two lingual cusps, and then it becomes the lingual developmental groove

Question 50

T or F: | from the occlusal view of the primary maxillary second molar, the distal marginal ridge is not well developed

Answer 50

false | it is well developed, unlike that of the first primary molar