Permanent Incisors Flashcards
is the crown bigger in lateral or central incisors?
upper central
comment on the surface of the crown of upper central incisors
smooth surface and slightly convex
describe the mesio-incisal angle of the upper central incisor crown
it is sharp
describe the disto-incisal angle of the upper central incisor crown
more rounded
what is the palatal surface of the upper central incisor like?
concave with mesial and distal marginal ridges which meet at the neck (cervix) of the tooth forming a convex cingulum
what are mammelons?
cusplets on the incisal edge of incisors and is more common in children
comment on the cervical undulation on the mesial and distal surfaces of the upper central incisor
the mesial undulation is greater than the distal
what gives the upper lateral incisor a long mesial surface
the cervical region is narrowed mesio-distally
comment on the mesio-incisal and disto-incisal angles of the upper lateral incisor
slightly rounded mesio-incisal angle and a short distal surface with a pronounced rounding of the disto-incisal angle
what do the marginal ridges of the upper lateral incisors produce?
a fossa which is highly susceptible to caries if not brushed correctly
what does the shape of the upper lateral incisor crown look like when viewed mesially or distally
it appears wedge-shaped
comment on the cervical undulation of the upper lateral incisor
it is greater on the mesial surface than the distal
from an intra-oral view how do the upper centrals compare with the upper laterals
the upper central is wider and is just longer than the lateral
what does the lower central incisor crown look like
it appears flat and almost symmetrical, it is perpendicular to a line bisecting the root
what are the mesio-incisal and disto-incisal angles look like?
the disto-incisal angle is marginally rounder than the mesio-incisal
from a mesial/distal perspective how does the crown appear on a lower central incisor
wedge-shaped and leans lingually
comment on the cervical undulation of the lower central incisors
greater undulation on the mesial surface than the distal
what are the marginal ridges like on a lower central incisor
they are faint and produce a small cingulum
what is the difference between the crowns of the lower lateral and lower central incisor
the crown of the lower lateral incisor is larger and appears more fan-shaped and shows more pronounced distal flare whereas the lower central incisor is smaller and the crown is almost symmetrical
is the mesial or distal side longer in the lower lateral
the mesial side is slightly longer
comment on the cervical undulation of lower lateral incisor
it is greater on the mesial surface than the distal
when viewed from the incisal edge, what does the crown of the lower lateral incisor look like?
it is slightly twisted on the root to follow the dental arch
