RD 1: Incisors and Canines Flashcards
function of anterior teeth
cut food, lip support, maintain esthetics
functions of incisors
cut food, speech, esthetics
cutting action of incisors
slice, chop, cut
cutting action of canines
tear, shear, rip
Permanent Anterior Eruption
-centrals always before lateral
-mand central/lateral before max central/lateral
-canines erupt last after central/lateral incisors
ridges on incisors
mesial marginal ridge and distal marginal ridge
incisal edges on incisors
labial incisal edge and lingual incisal edge
(only maxillary incisors)
what kind of fossa found on incisors and what surface
lingual fossa (2 maxillary, 1 mandibular)
developmental lobes on incisors (facial view)
mesial, middle, distal
what separates developmental lobes
developmental depressions (2 lines)
4th lingual lobe on incisor
cingulum
describe the incisor crown’s incisal egde
relatively straight or slightly curved
shape of incisors
-relatively rectangular
-longer incisogingivally than wide mesiodistally
incisor mesioincisal angles are more ______ than distoincisal angles
sharper (acute)
incisor crown contact areas on mesial surface are located where
incisal third
incisor crown contact areas on distal surface are located ……
more cervical than mesial
-EXCEPT : on distal of mandibular central (level contact)
from facial view, incisor roots become _____ from cervical line to apex
more narrow, taper
incisor roots are ______ faciolingually than mesiodistally
wider
-EXCEPT: maxillary central incisors (widths are equal)
incisor roots bend in apical third except which teeth
maxillary central incisor roots
-unlikely to bend
-more likely to bend distal
compare sizes of mandibular vs maxillary incisors
mandibular generally smaller than maxillary
mandibular incisor crowns are wider ______ while maxillary incisors are wider _____
faciolingually, mesiodistally
mandibular incisor crowns have ______ lingual surfaces with ________ anatomy than maxillary incisors
smoother, less prominent
compare length of mandibular and maxillary incisor roots in proportion to their crowns
mandibular roots are longer in proportion to their crowns than maxillary roots
which crowns are more symmetrical (facial)
mandibular incisors
which have larger cingulum
maxillary incisors
compare maxillary central incisors to mandibular
larger in all dimensions
maxillary central is the _____ of all the incisors
widest
maxillary central is narrowest in _____ third and widest in the ______ third
cervical, incisal
max lateral incisor is _______ mesiodistally to the max central incisor,
while the root of the max lateral is _______ than the max central
narrower, longer
max central is shaped like a
trapezoid
max central is slightly longer _______ than ______
incisocervically than mesiodistally
imbrication lines
small parallel lines that are formed due to arrangement of enamel prisms (facial view)
-max central
on max central incisor (lingual view) compare lengths of marginal ridges
mesial marginal ridge is longer than distal marginal ridge
on max central (lingual view), the cingulum is offset to which side
distal
when looking at max central incisor from insical view, compare the two surfaces
facial slightly convex, lingual more convex
on max central incisor (proximal view), where does the incisal edge lie compared to the root axis line
incisal edge is on or facial to root axis line
on max central incisor (proximal), which surface exhibits that greatest depth of curvature
mesial exhibits greater depth of curvature than any other surface
difference between max central and max lateral
max lateral is more round than max central
what types of variation can max lateral incisors display
-peg lateral
-agenesis (missing)
-pits
-grooves
max lateral has a ________ mesioncisal angle than max central
more rounded
max lateral have mesial and distal marginal ridges that are more _______ than max central
prominent
max lateral have lingual fossa that is ______ than max central
deeper or more pronounced
more likely to find _____ and _____ on cingulum of max lateral than max central
pits and grooves
linguogingival groove (fissure) may cross ________ onto cementum
cingulum
max lateral incisors (incisal view) exhibit more convexity ______ and ______ than max central incisors
labially and lingually
on max lateral incisors (insical view) cingulum is placed ____________ compared to central incisor
nearly centered mesiodistally
mandibular incisors
simplest and least variable teeth
-smallest permanent teeth
-resemble each other the most
compared to max incisors, mand incisor crowns are _________ incisocervically and ___________ mesiodistally
longer, narrower
mand central incisors has the narrowest ______________ dimension of any tooth
mesiodistal
mand central incisors have the __________ crown size of any permanent tooth
smallest
key feature of mandibular central incisors
crown symmetry (twins)
describe mesioincisal angle of mandibular central incisors
sharp compared to other incisors
describe mandibular central incisors from a lingual view
-relatively smooth
-slight concavity for lingual fossa
-indistinct marginal ridges
-small cingulum
mandibular central incisors from a proximal view have a facial surface _________
uniformly convex
on a mandibular central incisor, incisal edge lies __________
on or lingual to root axis line
(incisal view) compared to the max central incisor, the mand central incisor is wider ________ than __________
labiolingually, mesiodistally
mand lateral incisors resemble mand central but are more ______ and ____
rounded, slightly larger
on a mandibular lateral incisor, the disto-incisal angle is more _________ than the mandibular central
rounded
lingual view of a mandibular lateral incisor is similar to mand central but the cingulum is more ___________
offset to distal
promixal view on mandibular lateral incisors is similar to mand central but, when looking at the mesial surface, ___________
you can see the distal incisal edge in the background because it turns
insical edge on mandibular lateral incisors curves toward ________ and the cingulum is displaced toward the ___________
lingual, distal
-give it the appearance of being slightly twisted
mesio-incisal angle is more ________, while distal-incisal angle is more_______
square, rounded
contact points on max central (mesial and distal)
mesial= incisal
distal= juntion b/w incisal and middle
contact points on max lateral (mesial and distal)
mesial= junction b/w incisal and middle
distal= middle
contact points on max canine (mesial and distal)
same as max lateral
mesial = junction b/w incisal and middle
distal = middle
contact points on mand central (mesial and distal)
mesial = incisal
distal = incisal
contact points on mand distal (mesial and distal)
same as mand central
mesial = incisal
distal = incisal
contact points on mand canine (mesial and distal)
mesial = incisal
distal = middle
all teeth have facio-lingual contact points in the _______
middle third
overjet
normal bite occurs, the horizontal distance between incisal edges on max and mand teeth is normal
overbite
normal bite occurs, the vertical distance between incisal edges on max and mand teeth is normal
rank incisal embrasures from largest to smallest
1) b/w max canine and max lateral
2)b/w mand canine and mand lateral
3)b/w max lateral and max central
4) b/w max centrals
5) b/w mand lateral and central
6) b/w mand centrals
anterior teeth with centralized cingulum
mand central, max canine, max lateral
anterior teeth with distal cingulum
-max central
-mand canine
-mand lateral
anterior tooth with the tallest crown
mandibular canine
widest anterior tooth
maxillary central incisor
smallest anterior tooth
mandibular central incisiors
first succedaneous tooth
mandibular central incisor (replaces tooth)
smallest facial and incisal embrasure
mandibular central incisor
functions of canines
-support the lips and facial muscles
-cute, pierce, shear food
-provide protective mechanism when max and mand canines overlap (canine guidance)
longest of permanent teeth
canines
which teeth are the last to be lost from dental diseases
canines
large, long root of canines allows ________
good anchorage for abutments
2 types of fossa on canines
distal lingual and mesial lingual
2 types of cusp ridges on canine
distal cusp ridge and mesial cusp ridge
_______ canine crown is longer than the _______ canine crown
mandibular, maxillary
canines are the only teeth with a ______ ridge
labial
max and mand canine crowns have greater measurements ________ than _________
labiolingually, mesiodistally
on canines, the ________ contact area is more cervical than the ________ contact area
distal, mesial
canine eminence
projection of bone that houses root of canine (in gums)
what seperates mesial and distal fossae
lingual ridge
cingulum on maxillary canine is
large, centered
on a mx canine, the mesial marginal ridge is ________ than the distal marginal ridge
longer
on a max canine, the cusp tip is _____ to the root axis line
labial
the root of the max canine has what features (proximal view)
mesial and distal depressions
max canine (incisal view) is wider ________ than ________
labiolingually , mesiodistally
on a mand canine (labial view) the mesial side is _______-
flat, in line with mesial side of root
mandibular canine is __________ than the maxillary canine
slimmer
on a mand canine, the ridges and fossa are _______
not prominent
how many roots does a mandibular canine have
1, but can have 2
on a mand canine, the incisal ridge lies ______ to the root axis line
lingual
proximally, a mand canine has _________ crown-root convexity on facial surface
almost continuous
on a mand canine, (incisal view), the ______ dimension is larger than ________
labiolingual, mesiodistal
the mandibular canine has _______ anatomy than the max canine
less obvious
what is the widest anterior tooth facio-lingually
canine
on a max canine _____ cusp slope is shorter than the _____ cusp slope
mesial, distal
which anterior tooth is most likely to have a bifurcated root
mandibular canine
