Deciduous Molars Flashcards
In the primary maxillary first molar, where is the widest measurement?
at the contact areas
T or F:
in the primary maxillary first molar, the measurement at the cervix is about 2 mm less than opposing teeth
true
this makes the tooth look narrower at the cervix than the permanent
T or F:
in the primary maxillary first molar, the occlusal line is scalloped with a definite cusp form
false
while it is scalloped, it does NOT have a definite cusp form
T or F:
in the primary maxillary first molar, the buccal surface has deep buccal grooves
false
the buccal surface is smooth, with very little evidence of buccal groove
T or F:
the primary maxillary first molar is larger than the second molar in all dimensions
false
it is smaller than the second molar in all dimensions
T or F:
the primary maxillary first molar’s size and shape makes it appear to be a combination of molar and premolar
true
T or F:
the primary maxillary first molar has blunt roots with a narrow spread
false
roots are slender, long, with a wide spread
in the primary maxillary first molar, is the distal root longer or shorter than the mesial root?
shorter
in the primary maxillary first molar, where does the bifurcation of the roots start?
almost at the cervical line, showing very little root trunk
in the lingual view of the primary maxillary first molar, where does the crown converge?
lingually
in the primary maxillary first molar, what is the most prominent cusp?
mesiolingual cusp; distolingual cusp is poorly defined
in what view can all three roots be seen in the primary maxillary first molar?
the lingual view
T or F:
from the mesial view, the primary maxillary first molar is wider at the cervical third than at the occlusal third
true
T or F:
from the mesial view, the mesiobuccal cusp of the primary maxillary first molar is longer and sharper than the mesiolingual cusp
false
the mesiolingual cusp is longer and sharper than the mesiobuccal cusp
T or F:
from the mesial view of the primary maxillary first molar, the cervical line will curve a little to the occlusal
true
what is a major identifier of the primary maxillary first molar from the mesial view?
there is a large convexity on the buccal surface at the cervical third
from the mesial view of the primary maxillary first molar, which root is hidden behind the mesiobuccal root?
distobuccal root
describe characteristics of the lingual root in the primary maxillary first molar
it is long, slender, and curves sharply in the buccal direction at the middle 1/3
from the distal view, is the crown of the primary maxillary first molar more narrow distally or mesially?
distally, and it tapers a lot to the distal
in the primary maxillary first molar, is the prominent bulge seen in the distal view?
no
from the occlusal view, which permanent tooth does the primary maxillary first molar most resemble?
maxillary first premolar
T or F:
from the occlusal view, the primary maxillary first molar’s crown converges distally to lingually
false
it converges lingually to distally
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
true
in the primary maxillary first molar, what feature connects the central fossa to the mesial triangular fossa?
sulcus
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
true
T or F:
from the occlusal view, the primary maxillary first molar may have a distal developmental groove outlining a distolingual cusp
true
T or F:
from the buccal view, the primary maxillary second molar resembles a permanent first molar
true
but it is smaller
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
false
they are close to the same size and are more developed than the first molar
from the lingual view of the primary maxillary second molar, how many cusps are seen and what are their names?
3 cusps
1) mesiolingual cusp (large and well developed)
2) distolingual cusp (well developed)
3) supplemental cusp aka tubercle of carabelli
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.
true
in the lingual view of the primary maxillary second molar, what is present between the two lingual cusps?
developmental groove
how many roots can be seen from the lingual view of the primary maxillary second molar?
all three roots; lingual root is largest and thickest
from the mesial view, the primary maxillary second molar’s crown looks short. Why?
due to its thickness buccolingually
T or F:
in the mesial view, the primary maxillary second molar’s cervical line has little curvature and is mostly straight across
true
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?
about 2/3
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
true
T or F:
in the mesial view of the primary maxillary second molar, the mesiolingual cusp is just below the bifurcation
true
in the primary maxillary second molar, is the distal measurement more or less than the mesial measurement?
less
from the distal view of the primary maxillary second molar, is the point of bifurcation of the roots more apical or cervical?
more apical; it is also more centered above the crown compared to the mesial
from the occlusal view, what permanent tooth does the primary maxillary second molar resemble?
permanent first molar
what shape is the primary maxillary second molar from the occlusal aspect?
rhomboidal
name the 5 cusps of the primary maxillary second molar seen from the occlusal aspect
mesiobuccal, distobuccal, mesiolingual, distolingual, and the tubercle of carabelli
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
true
T or F:
in the occlusal view of the primary maxillary second molar, the central fossa has a central pit
true
in the occlusal view of the primary maxillary second molar, the mesial triangular fossa is just distal to which marginal ridge?
the mesial marginal ridge
is a central groove and buccal developmental groove seen from the occlusal aspect of the primary maxillary second molar?
yes
T or F:
from the occlusal view of the primary maxillary second molar, the oblique ridge is flat
false
it is prominent
in the occlusal view of the primary maxillary second molar, the distal triangular fossa is just mesial to which marginal ridge?
the distal marginal ridge
in the occlusal view of the primary maxillary second molar, what does the distal groove go between?
it goes between the two lingual cusps, and then it becomes the lingual developmental groove
T or F:
from the occlusal view of the primary maxillary second molar, the distal marginal ridge is not well developed
false
it is well developed, unlike that of the first primary molar
