Permanent Incisors

Question 1

is the crown bigger in lateral or central incisors?

Answer 1

upper central

Question 2

comment on the surface of the crown of upper central incisors

Answer 2

smooth surface and slightly convex

Question 3

describe the mesio-incisal angle of the upper central incisor crown

Answer 3

it is sharp

Question 4

describe the disto-incisal angle of the upper central incisor crown

Answer 4

more rounded

Question 5

what is the palatal surface of the upper central incisor like?

Answer 5

concave with mesial and distal marginal ridges which meet at the neck (cervix) of the tooth forming a convex cingulum

Question 6

what are mammelons?

Answer 6

cusplets on the incisal edge of incisors and is more common in children

Question 7

comment on the cervical undulation on the mesial and distal surfaces of the upper central incisor

Answer 7

the mesial undulation is greater than the distal

Question 8

what gives the upper lateral incisor a long mesial surface

Answer 8

the cervical region is narrowed mesio-distally

Question 9

comment on the mesio-incisal and disto-incisal angles of the upper lateral incisor

Answer 9

slightly rounded mesio-incisal angle and a short distal surface with a pronounced rounding of the disto-incisal angle

Question 10

what do the marginal ridges of the upper lateral incisors produce?

Answer 10

a fossa which is highly susceptible to caries if not brushed correctly

Question 11

what does the shape of the upper lateral incisor crown look like when viewed mesially or distally

Answer 11

it appears wedge-shaped

Question 12

comment on the cervical undulation of the upper lateral incisor

Answer 12

it is greater on the mesial surface than the distal

Question 13

from an intra-oral view how do the upper centrals compare with the upper laterals

Answer 13

the upper central is wider and is just longer than the lateral

Question 14

what does the lower central incisor crown look like

Answer 14

it appears flat and almost symmetrical, it is perpendicular to a line bisecting the root

Question 15

what are the mesio-incisal and disto-incisal angles look like?

Answer 15

the disto-incisal angle is marginally rounder than the mesio-incisal

Question 16

from a mesial/distal perspective how does the crown appear on a lower central incisor

Answer 16

wedge-shaped and leans lingually

Question 17

comment on the cervical undulation of the lower central incisors

Answer 17

greater undulation on the mesial surface than the distal

Question 18

what are the marginal ridges like on a lower central incisor

Answer 18

they are faint and produce a small cingulum

Question 19

what is the difference between the crowns of the lower lateral and lower central incisor

Answer 19

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

Question 20

is the mesial or distal side longer in the lower lateral

Answer 20

the mesial side is slightly longer

Question 21

comment on the cervical undulation of lower lateral incisor

Answer 21

it is greater on the mesial surface than the distal

Question 22

when viewed from the incisal edge, what does the crown of the lower lateral incisor look like?

Answer 22

it is slightly twisted on the root to follow the dental arch