incisors and canines Flashcards
on which teeth does the incisiocervical crown dimension exceed the mesiodistal crown dimension?
- mandibular central
- mandibular lateral
- maxillary central
- maxillary lateral
which incisal edge slopes? which direction does it slope?
which incisal edge is flat?
sloping incisal edge: mandibular lateral
direction of slope: towards the distal
from the incisal view, compare the mesiodistal-faciolingual dimensions of maxillary and mandibular central incisors
maxillary: mesiodistal is LARGER than faciolingual
mandibular: faciolingual is LARGER than mesiodistal
on which tooth is the cervical curvature greater than any other surface, and which surface?
maxillary central incisor on the mesial edge
describe the cingulum of the maxillary central incisor.
- what surface is it on
- where on the surface
- how developed
on the lingual side
in the cervical 1/2 of crown, slightly distal of M-D bisector
well developed
on a maxillary lateral incisor, how is the cervical line positioned?
height of curvature is distal to M-D bisector
describe the maxillary lateral incisor
- shape
- position
- relation to marginal ridges
- narrow mediodistally
- positioned slightly distal
- forms letter “U” with the marginal ridges
in the maxillary lateral incisor, describe the cervical line from a proximal view
- M vs. D
mesial curves more incisally than distal
the mesial curve is sharper
describe the incisal angles on the mandibular lateral incisor (from the facial view).
is this tooth symmetrical M-D?
MI angle is sharp
DI angle is round
NOT symmetrical
describe the maxillary central incisor from the facial view
- incisal line angles
- incisal edge form
- mamelons
incisal line angles:
- MI corner is squared and less rounded
- DI is even more rounded
incisal edge form
- ALMOST straight mesiodistally
mamelons
- 3 mamelons visible at eruption
- mesial and distal mamelons equal in size mesiodistally
- central lobe is the smallest
describe the mandibular lateral incisor from the lingual surface
- cingulum
- marginal ridge length
- lingual fossa
cingulum
- offset to distal
marginal ridge length
- mesial marginal ridge is longer from incisor to cervical then the distal marginal ridge
lingual fossa
- smooth and barely visible
describe the mandibular lateral incisor from the proximal view
- crown dimension
- heights of contour
- incisal edge location
- root surface form
crown dimension
- incisocervical crown is greater than the faciolingual dimension
heights of contour
- located in the cervical 1/3 of tooth
incisal edge location
- located lingual to the center of the root
root surface form
- a distinguishing root concavity is found on the distal surface
describe the mandibular lateral incisor
- crown dimsenion
- crown orientation on root
- cingulum
crown dimension
- crown is larger faciolingually than mesiodistally
crown orientation on root
- crown appears “twisted” on root
- distal portion of incisal edge located lingual to the mesial portion of the incisal edge
- distal margin ridge seen from a mesial view
cingulum
- appears displaced towards the distal
- LEAST DEVELOPED (shared with mandibular central incisor)
describe the maxillary central incisor from the facial view
- developmental grooves
- root form
developmental grooves
- AKA depressions
- labial lobe grooves, more evident than mandibular incisors
root form
- cone shaped blunt apex
- slightly distal of center
- no depressions
- root is only slightly longer than crown
- RELATIVE TO ITS CROWN, this tooth has the shortest root
describe the maxillary central incisor from the lingual view
- cervical line (compared to facial view)
- lingual fossa
- cingulum
cervical line
- more concave compared to facial
lingual fossa
- trapezoid shaped
- concavity bordered by incisal edge, marginal ridges and cingulum
cingulum
- crest of cingulum & greatest curvature of cervical line slightly distal of M-D bisector
