canines Flashcards
number of canines
4 in total, 1 in each quadrant
numbering of canine
13,23,33,43
6,11,22,27 (universal)
calcification initiation, completion of enamel, eruption, eruption seq
permanent canine time line
mx and mn canine ini of calc 4-5m
completion of enamel 6-7y
eruption mx canine: 11-12 y
eruption mn canine: 9-10 y
root completion mx canine: 13-15 y
root completion mn canine:12-14y
mx canine erupts after both premolars have erupted
mn canine erupts after mn lateral incisor
both permanent canines erupt after first molar eruption
canine dimension
both mx and mn canine have root length > crown length
faciolingual dimension greater than mesiodistal dimension
incisocervical > mesiodistal dimension
Incisocervical> faciolingual dimension
facial view
crown outline form
Pentagonal
facial view
cusp location
cusp tip is inline with the long axis of the root bisector (recall waxup one of the classmates did this) aka md centre for both mn and mx canines
cusp ridge
mesioincisal cusp ridge < distoincisal cusp ridge for both mn and mx canines
facial view
mi di angles
mx canine: mi di angles are 90-100 deg
mn canine: mi di angles are arnd 120 deg
there’s a tendency to have concavity at the mx canine
in both mn and mx canines: mi is sharper than di
both mx and mn facial view
prox contacts
mx canine: mesial prox contact is in incisal third centred FL ovoid with greater IC dimension
distal prox contact is in mid third, circular centred FL due to the greater convexity of distal surface
mn canine: mesial and distal prox contacts are in incisal third centred FL, ovoid with greater IC dimension
mx and mn
cervical line form / cej (may not be cej)
convex, evenly curved toward root
mx and mn facial view
distal crown root alignment / bulge
mx canine has more substantial tooth structure extending distally beyond root than mn canine
mx and mn facial view
distal cervical crown form
distal surface is slightly concave in cervical third
occlusal contacts of mx canine
mesial cusp ridge occludes w mn canine
distal cusp ridge occludes w mn first premolar
occlusal contacts of mn canine
mesial: mx lateral incisor
distal: mx canine
crown outline forms
facial: pentagonal
incisal: asymmetric diamond
mesial: triangular
mx and mn
facial ridge
mx:facial ridge is prominent as middle lobe has more development than mesial and distal lobes
mn: facial ridge is not prominent
mx
facial developmental depressions?
shallow depressions on mesial and distal facial surface of the tooth lying next to the prominent facial ridge
may extend onto the cusp ridge to create a concave area -> waxup model
mx and mn
imbrication lines?
in mx may have on cervical 1/3 but normally not present in mn canines
facial view, mx vx mn
root form and curvature
mx: distal curvature in the apical 1/3 , cervical and midroot sections are ovoid
mn: very straight no curvature
mesial/distal view
fl vs ic dimension
taller than thick -> ic > fl
cusp tip sharpness comparison
sharper in the mx canine
consider from the mesial view
wear facet
mx canine: lingual
mn canine: facial
consider from the mesial aspect
cusp tip location
similar to wear facet location, consider occlusal contacts
mx canine: facial
mn canine lingual
cusp tip thickness comparison
mx thicker than mn
mesial view
facial surface prominence
more prominent in the maxillary canines than mandibular
mesial view
lingual crown form
mx canine is more s shaped
facial hoc
both mx and mn canines are in cervical third
lingual hoc
cervical 1/3 on cingulum for both mx and mn canines
MESIAL VIEW
developmental root depression depth
greater in mn canine (recall mn is stronger in terms of root aspect)
root bifurcation
possible in mn canine, rare in mx canine
incisal view
fl vs md dimension
fl > md (thicker than wide)
incisal view
crown symmetry
greater in mn canine
incisal view
facial surface convexity
facial surface is more convex in mn canine
mn canine mesial half is convex
mn canine distal half is flat or coconcave
incisal view
distal outline
something that is in mx canine but not in mn canie
mx canine is compressed and squeezed fl for distal outline -> smaller fl dimension on distal than mesial
mn canine is relatively symmetrical, does not have this feature
incisal / lingual view
cingulum of mx and mn
mx has a more prominent cingulum than mn canine
mn cingulum is centred/ slightly distal from centre
lingual view
cingulum location of mn vs mx
mn cingulum is more cervical and distal to centre of crown
lingual view
lingual ridge prominence and mesial n distal marginal ridge prominence is more prominent in
more prominent in mx canine
lingual view
marginal ridges of mx vs mn
mx canine: ridges are more prominent
mesial marginal ridge is longer (due to shorter mesial cusp ridge)
distal marginal ridge is shorter and more elevated
mn canine:
distal marginal ridge more prominent than mesial marginal ridge and more curved than mesial marginal ridge
lingual aspect
fossae
deeper in mx but both mx and mn are quite shallow
lingual pits and grooves
hardly present on mn canine
