Lecture 5

Question 1

Canine function

Answer 1

Support lips and cheeks
• Cut, pierce, or shear food
• Protect (separate) posterior teeth during mandibular movements resulting in canine- protected occlusion

Question 2

Maximal intercuspal position

Answer 2

In maximal intercuspal position posterior teeth come in contact and act as stops to minimize horizontal load on anterior teeth. Anterior teeth guide all the other movements of the mandible so posterior teeth contact will not take place during lateral or protrusive movements.

Question 3

Canine shape/size

Answer 3

Pentagon, largest in each arch - maxillary canine is the longest in the mouth, coupled with long roots as well.

Question 4

Maxillarycanineroots

Answer 4

have a sharp apex and are more likely to bend distally at apex than mandibular

Question 5

Mandibular apex

Answer 5

More blunt, rare bending.

Question 6

Lingual ridge in canines

Answer 6

More prominent in maxillary canine - with mesial and distal fossae. Extends from cingulum to cusp tip/apex.

Question 7

Canine wear

Answer 7

Mandibularincisal ridges wear more on labial half of incisal ridge, whereas maxillary wear more on lingual (seen best from proximal views)

Question 8

Differentiate between canine and incisor

Answer 8

Wear pattern, root size, incisal edge with respect to midaxis. Crown is longer facially-lingually than mesially-distally.

Question 9

Cingulum -canine

Answer 9

Larger on maxillary than mandibular. Location is important. Maxillary has cingulum centered to root axis, mandibular is distal to root axis (like mandibular lateral incisors + max central incisors).

Question 10

Maxillary marginal ridges are more

Answer 10

prominant than mandibular

Question 11

Canine roots

Answer 11

Both types are narrower on lingual half (maxillary incisors are the only ones w/o root depressions - which are always deeper on distal). Straight root, pointed

Bothtypesare narrower on lingual half
• Mesial and distal root concavity maybe present

Maxillary has greater root bend.

Question 12

Canine Outline - proximal

Answer 12

Bothmaxillaryand mandibular outlines are wedge shaped (triangular) but maxillary canines are thicker

Question 13

Incisal Ridge and Cusp Tip of Canines - proximal

Answer 13

Cusp tips of maxillary canines are more labial to midroot axis, whereas mandibular are more lingual or centered

Question 14

Canine Height of Contour - proximal

Answer 14

In cervical third, HOC is further away from CEJ in maxillary. Meanwhile, CEJ, root in line and closer for mandibular. Maxillary is also more prominent. There is a much greater depression on maxillary at CEJ - almost like 2 convexities vs. 1 for mandibular. Maxillary also has wider faciolingual ridge.

Question 15

Canine Cervical line

Answer 15

Both CEJ curvatures are greater on mesial than distal. Mandibular curve may appear even greater due to narrow faciolingual dimension.

Question 16

Canine root

Answer 16

Depressions greater on distal. Mandibular is the fish tooth…

Question 17

Canine crown proportions - incisal

Answer 17

Labiolingual greater than mesiodistal - especially in mandibular canines (narrower mesiodistally than maxillary). Distolingual twist is apparent on mandibular canines, not maxillary.

Question 18

Canine cingulum and marginal ridges - incisal

Answer 18

Cingulum distal to center on mandibular. Mesial marginal ridge thus is longer on mandibular.

Question 19

Canine labial contour - incisal

Answer 19

Labial outline of both canines are convex. Distal half of labial surface of maxillary canine crown is more prominently concave.

Question 20

Canine lingual contour - incisal view

Answer 20

Lingual ridge and two lingual fossae more evident and obvious on maxillary canine.

Question 21

Incisal Ridges and Cusp Tips of canines

Answer 21

Incisalridge(edge)is divided into mesial and distal cusp ridges forming a cusp
• Mesialcuspridgeis shorter than distal
• Facialoutlineis pentagon shaped

Question 22

Canine proportions

Answer 22

Caninecrowns: Labiolingual greater than mesiodistal like mandibular incisors

Question 23

Compared to incisors

Answer 23

• Distalcontactismore cervical than mesial contact
• Crownismoreconvex on distal
• Crowntapers narrower toward cervical
• Rootslongerthan crowns

Question 24

Canines similar to incisors

Answer 24

Proximaloutlinesof crowns are wedge shaped (triangular) with lingual “S” shape
• Mesialcementoenamel junction (CEJ) has more curve than distal
• Facialandlingual height of contour on cervical 1/3

Marginalridgestaper toward cingulum (lingual half narrower than facial half)
• Fromincisal:lingual contour more curved (convex) than labial
• Rootstapertoward apex (and toward lingual)

Question 25

Incisal Facet on Maxillary Canine

Answer 25

Diamond shaped

Question 26

Canine facial surface

Answer 26

Facialsurfaceformed by three lobes: middle forms labial ridge, which is more prominent on maxillary canine

Question 27

Mesial canine incisal edge

Answer 27

Mesialcrowncontour of maxillary is convex, whereas mandibular mesial contour is almost flat and nearly in line with root contour

Question 28

Mandibularcanine crown

Answer 28

appears bent distally relative to root

Question 29

Mandibular canine cusp tip

Answer 29

Mandibularcuspis more obtuse (more blunt)(120) with mesial cusp ridge closer to horizontal