Lecture 3- Permanent Maxillary Incisors Flashcards
general characteristics of maxillary central incisors
-member of the incisor classification of teeth
-used to cut or incise food
-shovel shaped
-2 in the maxillary arch (#8 &9)
-succedaneous teeth
-erupt @ 7-8 years of age
what shape is the crown of maxillary central incisors from the facial aspect?
trapezoidal
anatomical crown of maxillary central incisors is _____ than it is _____
longer; wide
how long is the maxillary central incisors crown
10-11 mm
how wide is the maxillary central incisors crown
8-9 mm
mesiodistal dimension at the CEJ of maxillary central incisors is…
6-7 mm
mesial outline of the maxillary central incisors is…
relatively straight; only slightly convex
height of convexity/contour
point of greatest convexity on a tooth surface
where is the height of convexity of mesial surface of maxillary central incisors located?
incisal 1/3 of the tooth
where is the mesial contact area of the maxillary central incisors located?
incisal 1/3 of the tooth
contact area
where the tooth touches another tooth- occurs at the mesial/distal height of contour
which outline is more convex for the maxillary central incisors?
distal outline
where is the height of contour on the distal surface of maxillary central incisors located?
at the junction of the middle and incisal 1/3’s
where is the distal contact area of the maxillary central incisors located?
junction of the middle and incisal 1/3’s
incisal outline of maxillary central incisors is _______
straight
mesioincisal angle of maxillary central incisors is….
a right angle
distoincisal angle of maxillary central incisors is…
more rounded than the mesioincisal angle
line angle
junction of TWO tooth surfaces
point angle
junction of THREE tooth surfaces
presentation of CEJ in maxillary central incisors
CEJ is curved toward the root apex (apically)
does the facial aspect of maxillary central incisors contain labial developmental depressions and ridges?
yes
root of maxillary central incisors
-single root
-cone shaped with a blunt apex
-apex of the root is slightly to the distal of the long axis of the tooth
length of root of maxillary central incisors
13 mm
long axis
a line extending through the center of an object lengthwise
ridges of maxillary central incisors on lingual aspect
mesial and distal marginal ridges
lingual fossa of maxillary central incisors
bounded by the incisal edge, mesial and distal marginal ridges & the cingulum
crown and root of maxillary central incisors taper to…
lingual
*part of the mesial and distal aspects of the tooth can be seen from the lingual aspect
mesial aspect of maxillary central incisors shaped like….
triangle or wedge
facial outline of mesial aspect of maxillary central incisors is…
slightly curved, flat incisally
lingual outline of mesial aspect of maxillary central incisors is…
concavo-convex
incisal edge of mesial apect of maxillary central incisors lies ___ to the dissecting line
lies on the dissecting line
incisal surface of the mesial aspect of maxillary central incisors slopes towards…
the lingual
what is special about the mesial cervical line of maxillary central incisors?
has the greatest amount of curvature of any tooth in the mouth
*curved toward the incisal
differences between mesial and distal apects of maxillary central incisors
-distal aspect crown looks thicker in incisal 1/3
-curvature of cervical line of distal aspect is less than the mesial
incisal aspect of maxillary central incisors is shaped like?
triangle
from the incisal aspect of the maxillary central incisors, is the tooth wider facially or lingually?q
facially
from the incisal aspect of the maxillary central incisors, what does the facial surface look like?
broad and flat
from the incisal aspect of the maxillary central incisors, what does the lingual surface look like?
narrow and curved
what does the incisal edge of the maxillary central incisors bisect?
the faciolingual diameter
where is the point of convexity of the cingulum from the incisal aspect of maxillary central incisors located?
distal to the center of the lingual surface
where are the mesial and distal contact points from the incisal aspect of maxillary central incisors located?
centered on the proximal surfaces labiolingually
which line angles of the maxillary central incisors are more prominent?
-MF and DF line angles
-ML and DL line angles
MF and DF line angles are more prominent
which line angle of the maxillary central incisors is more obtuse/round?
-MF line angle
-DF line angle
DF line angle is more obtuse/round
are there developmental depressions and ridges on the labial surface of maxillary central incisors?
yes
labiolingual width of maxillary central incisors
7mm
is the crown of maxillary central incisors wider mesiodistally or faciolingually?
mesiodistally
how many lobes do the maxillary central incisors develop from?
4
mesial lobe of maxillary central incisors
mesial marginal ridge and mesial part of labial surface
distal lobe of maxillary central incisors
distal marginal ridge and distal part of labial surface
labial lobe of maxillary central incisors
slightly prominent ridge
lingual lobe of maxillary central incisors
forms the cingulum
what marks of the junction of lobes between the facial lobes of maxillary central incisors?
mesiofacial and distofacial developmental depressions
how many pulp canals do maxillary central incisors have?
one singular canal
facial view of pulp canal in maxillary central incisors
-pulp chamber with three pulp horns
-pulp horns disappear as patient ages
cross sectional view of pulp canal in maxillary central incisors
-triangular in view
-mesial, distal, and facial wall
-mesial wall is longer than the distal
general characteristics of maxillary lateral incisors
-#7 and 10
-teeth are second from midline in each quadrant
-erupt 8-9 years of age
-supplement the central incisor in function
which tooth varies in form more than any other tooth in the mouth?
the maxillary lateral incisor
*exception: third molars
which anterior tooth is most frequently congenitally absent?
the maxillary lateral incisor
*third molars are the more frequently congenitally absent tooth
differences in maxillary lateral incisors compared to maxillary central incisors
-smaller in all dimensions EXCEPT root length
-more rounded
-more pronounced mesial and distal marginal ridges (lingual surface)
-lingual fossa is deeper
facial aspect of maxillary lateral incisors are shaped like?
trapezoid
where is the mesial height of contour of maxillary lateral incisors located?
junction of the middle and incisor 1/3s
where is the distal height of contour of maxillary lateral incisors located?
middle 1/3
labial surface of maxillary lateral incisors is more ___ than the central?
convex
root of maxillary lateral incisors
-pointed
-as long, or longer than central maxillary incisor
-usually tapers distally
lingual aspect of maxillary lateral incisors is shaped like?
trapezoid
lingual fossa of maxillary lateral incisors is ____ than central
deeper
*often with a lingual pit
grooves of lingual aspect of maxillary lateral incisors
deep developmental grooves
-lingual developmental groove on distal of cingulum
where is the greatest curvature on the facial and lingual surfaces of mesial aspect of maxillary lateral incisors located?
in the cervical 1/3
*same as central incisor
