Ch 7 Permanent Mandibular Incisors

Question 1

• CI
• crown
• root
• calc
• erupt

Answer 1

• 4-5
• 9
• 3-4 mo
• 6-7

Question 2

• LI
• crown
• root
• calc
• erupt

Answer 2

• 4-5
• 10
• 3-6 mo
• 7-8

Question 3

Mandibular CI (reading)

Answer 3

• smallest tooth in dental arch
• crown more than half the mesiodistal diameter o maxCI
• greatest masticatory stress are brought to bear of mandibular incisors in a labiolingual direction
• root is very narrow mesiodistally, wide labiolingual
  - length> max CI
• distal root has a deeper depression

Question 4

Mandibular CI (lecture)

Answer 4

• root flat mesio-distally w/ a mesial/distal concavity
• incisal edge is lingual to long axis of tooth
• narrowest crown
• most symmetrical
• first succedaneous tooth
• erupts w/2 pulp horns, 3 mammelons, and lingual anatomy
• crown is fan-shaped
• smallest facial embrasure in mouth
• smooth lingual surface
• contactat incisal 1/3
• mesial/distal CA @same level

Question 5

Mandibular LI (read)

Answer 5

• 2nd mand tooth fr median
• resembles mand CI so closely
• operate as a team, functional form is related
• common it has 2 canals in 1 root
• LI > CI in measurments
• mesial is longer than distal, becoz incisal ridge slopes downward in distal direction
• root is longer than CI

Question 6

Mandibular LI (lecture)

Answer 6

• not symmetrical
• incisal edge appears twisted on its apex, curving lingually
• incisal ridge is not @ a right angle to mesial/distal sides
• oval in cross-section