maxillary incisors

Question 1

GENERAL NOTES ABOUT ANATOMY OF MAXILLARY CENTRAL INCISORS

Answer 1

• crown is longer than it is wide
• root is longer than the crown
• crown is wider mesiodistally than faciolingually

Question 2

when is the first evidence of calcification for maxillary central incisors?

Answer 2

3-4 months

Question 3

when is the enamel (crown) completed for a maxillary central incisor?

Answer 3

4-5 months

Question 4

when is the time of eruption for maxillary central incisors?

Answer 4

7-8 years

Question 5

when is the root completed for maxillary central incisors?

Answer 5

10 years

Question 6

GENERAL NOTES ABOUT MAXILLARY CENTRAL INCISORS

Answer 6

• used for cutting or incising food
• shovel shaped
• succedaneous teeth

Question 7

where is the mesial interproximal contact located for a maxillary central incisor?

Answer 7

incisal 1/3 of tooth

Question 8

what is the point of greatest convexity on a tooth surface?

Answer 8

height of convexity / contour

Question 9

where is the distal interproximal contact located for a maxillary central incisor?

Answer 9

junction of the middle and incisal 1/3’s

Question 10

what are the rounded protuberances found on the incisal edges of newly erupted incisors called?

Answer 10

mamelons
NOTE - generally wear away with time to give a flat incisal edge

Question 11

what incisal angle is a right angle for a maxillary central incisor?

Answer 11

mesioincisal

Question 12

what incisal angle is a more rounded angle for a maxillary central incisor?

Answer 12

distoincisal angle

Question 13

what is a junction of two tooth surfaces called?

Answer 13

line angle

Question 14

what is a junction of three tooth surfaces called?

Answer 14

point angle

Question 15

what is the cervical line / CEJ curved towards on a maxillary central incisor (facial)?

Answer 15

root apex

Question 16

how many roots does a maxillary central incisor have?

Answer 16

single inverted cone shaped root (located slightly distal of long axis of tooth)

Question 17

what is the lingual fossa bound by on a maxillary central incisor?

Answer 17

incisal edge, mesial and distal marginal ridges, cingulum

Question 18

in what direction is the CEJ curved towards the root (lingually) for a maxillary central incisor?

Answer 18

convex

Question 19

where does the incisal edge lay when the tooth is bisected longitudinally for a maxillary central incisor?

Answer 19

incisal edge lays on line

Question 20

NEED TO REMEMBER - MAXILLARY CENTRAL INCISORS

Answer 20

the mesial cervical line has the greatest amount of curvature of any tooth in the mouth
NOTE - mesial curvature is greater than distal aspect

Question 21

where is the point of convexity of the cingulum (incisal aspect) for a maxillary central incisor?

Answer 21

distal to the center of the lingual surface

Question 22

how many pulp canals and pulp horns are present on a maxillary central incisor?

Answer 22

pulp canal - 1
pulp horns - 3 (disappear as a person ages)

Question 23

how many lobes does a maxillary central incisor devleop from?

Answer 23

4 lobes
- mesial : develops into mesial marginal ridge and mesial part of labial surface
- distal : developed into distal marginal ridge and distal part of the labial surface
- labial : developed into labial ridge
- lingual : develops into cingulum

Question 24

when is the first evidence of calcification for maxillary lateral incisors?

Answer 24

1 year

Question 25

when is the enamel (crown) completed for maxillary lateral incisors?

Answer 25

4-5 years

Question 26

when does eruption occur for maxillary lateral incisors?

Answer 26

8-9 years

Question 27

when is the root completed for maxillary lateral incisors?

Answer 27

11 years

Question 28

NEED TO REMEMBER - MAXILLARY LATERAL INCISORS

Answer 28

the maxillary lateral incisor varies in form more than any other tooth in the mouth (exception - third molars)

Question 29

NEED TO REMEMBER - MAXILLARY LATERAL INCISORS

Answer 29

maxillary lateral incisors are the most frequently congenitally absent ANTERIOR tooth (third molars are more frequently congenitally absent tooth)

Question 30

where is the mesial height of contour at on a maxillary lateral incisor?

Answer 30

junction of the middle and incisal 1/3's

Question 31

where is the distal height of contour at on a maxillary lateral incisor?

Answer 31

in middle 1/3

Question 32

GENERAL NOTES ABOUT MAXILLARY LATERAL INCISORS

Answer 32

similar in shape to maxillary central incisors... - smaller in all dimensions except root length - more rounded - more pronounced mesial and distal marginal ridges - lingual fossa is deeper

Question 33

where is the greatest curvature on the facial and lingual surfaces of a maxillary lateral incisor?

Answer 33

cervical 1/3 (also true in central incisor)

Question 34

which direction (mesial or distal) is the crest of the cingulum located when viewed from the incisal edge (maxillary lateral incisor)?

Answer 34

slightly to the distal of center of tooth

Question 35

how many pulp canals does a maxillary lateral incisor have and how many pulp horns?

Answer 35

pulp canal - 1 pulp horns - 2

Question 36

how many lobes does a maxillary lateral incisor develop from?

Answer 36

4 lobes