Canines

Question 1

why are they key?

Answer 1

very strong, can act as abutments for attachments - long, strong roots form part of canine eminence of maxilla

Question 2

canine guidance/canine disclusion

Answer 2

canines help to keep teeth in line during lateral movements; protect other teeth

Question 3

no incisal edge

Answer 3

cusp tip instead with cusp slopes/ridges

Question 4

max canine #s / erupt

Answer 4

6 and 11

erupt b/w 11-12 y, after incisors

Question 5

max incisors cusp tip

Answer 5

is mesial to crown center (offset to the mesial) therefore the D slope is longer (and M is steeper)

Question 6

coronal outline features

Answer 6

D more curved, cervical constriction

CEJ convex toward apex

Question 7

max contacts

Answer 7

M junction of incisal and middle thirds

D in the middle third

Question 8

max cervical height of contour

Answer 8

prominent facial ridge (in the cervical region)

Question 9

max root

Answer 9

D or F oriented
conical
smooth and convex from facial view

Question 10

max height of cingulum

Answer 10

equals half the height of the crown. HUGE cingulum

Question 11

max position of cingulum

Answer 11

centered M/D

Question 12

max contour of CEJ

Answer 12

almost flat!

Question 13

max lingual ridge

Answer 13

a prominent convexity dividing the lingual fossa into two fossae

Question 14

max marginal ridges (how rounded the proximal surfaces are)

Answer 14

quite convex and prominent

Question 15

max taper of crown and root

Answer 15

taper dramatically to the lingual - creates a hook that allows it to grab the bone better

Question 16

max position of cust tip

Answer 16

located toward the mesial

Question 17

max cingulum location

Answer 17

centered M/D

Question 18

cusp tip leans

Answer 18

out, toward the facial (so the mands can fit…)

Question 19

max root features

Answer 19

tapered root on lingual - can see M and D (think of carving)

D depression more likely and more likely to larger

Question 20

max M/D views compared

Answer 20

CEJ curvature greater on M
CEJ concave to apex like others
Deeper depression on D
slight facial curve of root apex
cusp tip slightly facial

Question 21

maxillary canine numbers

Answer 21

6 and 11

Question 22

mandibular canine numbers

Answer 22

22 and 27

Question 23

mandibular canine eruption time

Answer 23

9-10 y

in general, mandibular teeth erupt before their maxillary counterparts

Question 24

key diffferences: mand candines to max canines

Answer 24

root to crown ratio closer to 1:1 with mandibular canines
mesial outline a lot straighter
distal outline more curve
cusp offset toward mesial (same)
overall anatomy less robust than maxillary counterparts

Question 25

mandibular contacts

Answer 25

distal more cervical: junction of incisal and middle 1/3s (still in incisal)
MI in incisal 1/3

Question 26

lingual view mand canine

Answer 26

softer features than max
crown and root taper toward the LINGUAL
cusp tip toward the mesial

Question 27

M/D notables for mand canine

Answer 27

• cusp tip lingual
• depressions - D deeper
• HOC in cervical region - F and L
• cingulum less prominent on mand - not 1/2 the height!
• facial crown and root outlines form continuous arc - looks like a fish on its side

Question 28

mand canine incisal view

Answer 28

• see a lot more of the facial due to cusp tip offset toward the lingual
• F/L greater than M/D length (fatter than it is wide)
• greater bulge on the D
• facial prominence offset toward the mesial BUT cingulum is centered - important because the teeth are turning in the arch

Question 29

comparing max and mand canines

Answer 29

• length: approx same in same mouth
• max wider crown F/L, mand wider root F/L
• CEJ: max longer root, mand longer crown
• depressions in mand usu deeper
• max cusp tip facial, mand lingual (so they can fit inside ea other)

Question 30

bifurcated root system

Answer 30

• possible in mandibular canine; F-L dimensions of the crown may be GREATER than F-L dimensions of the crown!
• one root toward the facial and one toward the lingual