anatomy and development Flashcards
what primary tooth does not resemble any other tooth
mand 1st primary molar
how much smaller are the volume and enamel area
1/2 the size of perm teeth
t/f primary teeth are whiter than perm successors
trew
difference bt primary and perm molar crowns
smaller, more bulbous with more cervical constriction (bell shaped)
buccal bulge
broad, flat prox contacts
t/f primary max 2nd molar is a smaller version of perm max 1st molar
true.
t/f pulps of prim molar have long m pulp horns
true
describe primary roots
slender and tapering
longer in proportion to the crown than in the corresponding perm tooth
prim molar roots diverge and bulge to envelope the perm premolar crowns
describe pulp in prim teeth
horns are longer and more pointed
pulps are larger
canal space is not readily filled when root canal therapy is indicated
which pulp horn is the most prominent
MB
t/f dentin is 1/4 the thickness of the perm dentition
false. 1/2
enamel rods in gingival 1/3 extend in what direction
occlusally from the DEJ
describe the thickness of primary enamel
1mm, 1/2 the thickness of corresponding perm teeth
describe the thickness of primary dentin
half the thickness of the corresponding perm teeth, less dense, more easily cut
describe the interdental papilla of primary dentition
high and extends to interprox contact
t/f there is a low degree of bruxism in kids
false. a ton. primary molars typically have a flat occlusal table
t/f sequence of eruption is more important than time of eruption
true
rule of 4
eruption of 4 teeth every 4 mo beginning with 4 teeth at 6-7mo
what teeth erupt first
mand centrals at 6-7 mo
primate space
m to max canines, d to mand canines
prim teeth should be in normal alignment and occlusion shortly after age ___ with al the roots fully formed by the time the child is ___ yo
2, 3
flush terminal plane
prim 2nd molars and canines end to end
mesial step
class I canine (mand canine ant to max canine)
distal step
class II canine
what is the best predictor/determining factor for molar relationship
combine the canine with 2nd molar
when does no primate space exist?
late mesial drift
at what age will you have delayed eruption with a premature loss of your primary molar
loss at 5 yrs or younger
when would you get arch length loss
when mand 2nd perm molar erupts before 2nd pm
t/f. mesial force causes molars to move into pm space before pm erupts
true
natal teeth
present at birth
neonatal teeth
erupt during first month of life
riga-fede
traumatic ulceration of the ventral surface of tongue commonly associated with natal and neonatal teeth in newborns
gemination
single tooth bud, 2 crowns
fusion
union of 2 separate teeth, 2 roots.
concrescence
fusion of 2 teeth along root surface
NON developmental defect
turner tooth
localized enamel hypoplasia
trauma or localized infection during the apposition stage of development
hyperdontia
more common in maxilla
mesiodens
males affected more than women, 2:1
hypodontia
more common in mand
2nd pm then lat incisor
