Ch 6 Permanent Max LI

Question 1

Labial:

• crown
• mesial
• distal
• mesiodistally
• roots

Answer 1

more curvature, rounded incisal ridge, rounded incisal angles, mesial/distal

• smaller in all dimensions, more convex than CI, 2 to 3mm shorter
• resembles CI, more rounded mesioincisal angle. Crest of contour is at junction of middle and incisal thirds.
• more rounded, crest more cervical. @ center of middle third, more convex labially (semicircular outline exhibited by some forms)
• 2mm more narrow than CI
• longer root (5x lenghth of crown) greater in proportion to crown lenghth than centrals. curves sharply distally. (tapers evenly from cervical line to approx. 2/3s of its length apically.

Question 2

Lingual

Answer 2

• cingulum prominent
• lingual pit
• fossa more concaved, circubscribed
• tooth tapers toward lingual
• mesial/distal marginal ridges are marked

Question 3

Mesial

Answer 3

• root appears longer
• crown is shorter, labioling ofcrownand root is 1mm less than max CI
• cervical line curvature towards incisal ridge, less extent than CI bcoz of small crown
• incisal ridge appears thicker than CI
• root appears tapered w/a blunt, round apical
• labial outline is straight

Question 4

Distal

Answer 4

• width of crown appears thicker than mesial becoz of placemnt of crown on root
• curvature of cervical is mm orso less in depththan mesial
• dev’t grooves common

Question 5

Incisal

Answer 5

• resemble CI or canine (if it conforms in dev’t to its CI neighbor, it will from incisal aspect, resembleCI,except in size, however cingulum may be large.
• large cingulum
• labioling dimension may be greater than usual in comparison w/ mesiodistal dimension, if present, may resemble small canine
• convexity labially and lingually