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Dental Morphology > canines > Flashcards

canines Flashcards

1
Q

number of canines

A

4 in total, 1 in each quadrant

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2
Q

numbering of canine

A

13,23,33,43
6,11,22,27 (universal)

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3
Q

calcification initiation, completion of enamel, eruption, eruption seq

permanent canine time line

A

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

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4
Q

canine dimension

A

both mx and mn canine have root length > crown length
faciolingual dimension greater than mesiodistal dimension
incisocervical > mesiodistal dimension
Incisocervical> faciolingual dimension

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5
Q

facial view

crown outline form

A

Pentagonal

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6
Q

facial view

cusp location

A

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

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7
Q

cusp ridge

A

mesioincisal cusp ridge < distoincisal cusp ridge for both mn and mx canines

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8
Q

facial view

mi di angles

A

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

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9
Q

both mx and mn facial view

prox contacts

A

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

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10
Q

mx and mn

cervical line form / cej (may not be cej)

A

convex, evenly curved toward root

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11
Q

mx and mn facial view

distal crown root alignment / bulge

A

mx canine has more substantial tooth structure extending distally beyond root than mn canine

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12
Q

mx and mn facial view

distal cervical crown form

A

distal surface is slightly concave in cervical third

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13
Q

occlusal contacts of mx canine

A

mesial cusp ridge occludes w mn canine
distal cusp ridge occludes w mn first premolar

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14
Q

occlusal contacts of mn canine

A

mesial: mx lateral incisor
distal: mx canine

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15
Q

crown outline forms

A

facial: pentagonal
incisal: asymmetric diamond
mesial: triangular

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16
Q

mx and mn

facial ridge

A

mx:facial ridge is prominent as middle lobe has more development than mesial and distal lobes
mn: facial ridge is not prominent

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17
Q

mx

facial developmental depressions?

A

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

18
Q

mx and mn

imbrication lines?

A

in mx may have on cervical 1/3 but normally not present in mn canines

19
Q

facial view, mx vx mn

root form and curvature

A

mx: distal curvature in the apical 1/3 , cervical and midroot sections are ovoid
mn: very straight no curvature

20
Q

mesial/distal view

fl vs ic dimension

A

taller than thick -> ic > fl

21
Q

cusp tip sharpness comparison

A

sharper in the mx canine

22
Q

consider from the mesial view

wear facet

A

mx canine: lingual
mn canine: facial

23
Q

consider from the mesial aspect

cusp tip location

A

similar to wear facet location, consider occlusal contacts
mx canine: facial
mn canine lingual

24
Q

cusp tip thickness comparison

A

mx thicker than mn

25
Q

mesial view

facial surface prominence

A

more prominent in the maxillary canines than mandibular

26
Q

mesial view

lingual crown form

A

mx canine is more s shaped

27
Q

facial hoc

A

both mx and mn canines are in cervical third

28
Q

lingual hoc

A

cervical 1/3 on cingulum for both mx and mn canines

29
Q

MESIAL VIEW

developmental root depression depth

A

greater in mn canine (recall mn is stronger in terms of root aspect)

30
Q

root bifurcation

A

possible in mn canine, rare in mx canine

31
Q

incisal view

fl vs md dimension

A

fl > md (thicker than wide)

32
Q

incisal view

crown symmetry

A

greater in mn canine

33
Q

incisal view

facial surface convexity

A

facial surface is more convex in mn canine
mn canine mesial half is convex
mn canine distal half is flat or coconcave

34
Q

incisal view

distal outline

something that is in mx canine but not in mn canie

A

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

35
Q

incisal / lingual view

cingulum of mx and mn

A

mx has a more prominent cingulum than mn canine
mn cingulum is centred/ slightly distal from centre

36
Q

lingual view

cingulum location of mn vs mx

A

mn cingulum is more cervical and distal to centre of crown

37
Q

lingual view

lingual ridge prominence and mesial n distal marginal ridge prominence is more prominent in

A

more prominent in mx canine

38
Q

lingual view

marginal ridges of mx vs mn

A

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

39
Q

lingual aspect

fossae

A

deeper in mx but both mx and mn are quite shallow

40
Q

lingual pits and grooves

A

hardly present on mn canine

Dental Morphology (4 decks)

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