canines

Question 1

number of canines

Answer 1

4 in total, 1 in each quadrant

Question 2

numbering of canine

Answer 2

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

Question 3

calcification initiation, completion of enamel, eruption, eruption seq

permanent canine time line

Answer 3

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

Question 4

canine dimension

Answer 4

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

Question 5

facial view

crown outline form

Answer 5

Pentagonal

Question 6

facial view

cusp location

Answer 6

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

Question 7

cusp ridge

Answer 7

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

Question 8

facial view

mi di angles

Answer 8

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

Question 9

both mx and mn facial view

prox contacts

Answer 9

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

Question 10

mx and mn

cervical line form / cej (may not be cej)

Answer 10

convex, evenly curved toward root

Question 11

mx and mn facial view

distal crown root alignment / bulge

Answer 11

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

Question 12

mx and mn facial view

distal cervical crown form

Answer 12

distal surface is slightly concave in cervical third

Question 13

occlusal contacts of mx canine

Answer 13

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

Question 14

occlusal contacts of mn canine

Answer 14

mesial: mx lateral incisor
distal: mx canine

Question 15

crown outline forms

Answer 15

facial: pentagonal
incisal: asymmetric diamond
mesial: triangular

Question 16

mx and mn

facial ridge

Answer 16

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

Question 17

mx

facial developmental depressions?

Answer 17

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

Question 18

mx and mn

imbrication lines?

Answer 18

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

Question 19

facial view, mx vx mn

root form and curvature

Answer 19

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

Question 20

mesial/distal view

fl vs ic dimension

Answer 20

taller than thick -> ic > fl

Question 21

cusp tip sharpness comparison

Answer 21

sharper in the mx canine

Question 22

consider from the mesial view

wear facet

Answer 22

mx canine: lingual
mn canine: facial

Question 23

consider from the mesial aspect

cusp tip location

Answer 23

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

Question 24

cusp tip thickness comparison

Answer 24

mx thicker than mn

Question 25

# mesial view facial surface prominence

Answer 25

more prominent in the maxillary canines than mandibular

Question 26

# mesial view lingual crown form

Answer 26

mx canine is more s shaped

Question 27

facial hoc

Answer 27

both mx and mn canines are in cervical third

Question 28

lingual hoc

Answer 28

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

Question 29

# MESIAL VIEW developmental root depression depth

Answer 29

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

Question 30

root bifurcation

Answer 30

possible in mn canine, rare in mx canine

Question 31

# incisal view fl vs md dimension

Answer 31

fl > md (thicker than wide)

Question 32

# incisal view crown symmetry

Answer 32

greater in mn canine

Question 33

# incisal view facial surface convexity

Answer 33

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

Question 34

# incisal view **distal outline** | something that is in mx canine but not in mn canie

Answer 34

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**

Question 35

# incisal / lingual view cingulum of mx and mn

Answer 35

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

Question 36

# lingual view cingulum location of mn vs mx

Answer 36

mn cingulum is more cervical and distal to centre of crown

Question 37

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

Answer 37

more prominent in mx canine

Question 38

# lingual view marginal ridges of mx vs mn

Answer 38

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

Question 39

# lingual aspect fossae

Answer 39

deeper in mx but both mx and mn are quite shallow

Question 40

lingual pits and grooves

Answer 40

hardly present on mn canine