maxillary incisors Flashcards
GENERAL NOTES ABOUT ANATOMY OF MAXILLARY CENTRAL INCISORS
- crown is longer than it is wide
- root is longer than the crown
- crown is wider mesiodistally than faciolingually
when is the first evidence of calcification for maxillary central incisors?
3-4 months
when is the enamel (crown) completed for a maxillary central incisor?
4-5 months
when is the time of eruption for maxillary central incisors?
7-8 years
when is the root completed for maxillary central incisors?
10 years
GENERAL NOTES ABOUT MAXILLARY CENTRAL INCISORS
- used for cutting or incising food
- shovel shaped
- succedaneous teeth
where is the mesial interproximal contact located for a maxillary central incisor?
incisal 1/3 of tooth
what is the point of greatest convexity on a tooth surface?
height of convexity / contour
where is the distal interproximal contact located for a maxillary central incisor?
junction of the middle and incisal 1/3’s
what are the rounded protuberances found on the incisal edges of newly erupted incisors called?
mamelons
NOTE - generally wear away with time to give a flat incisal edge
what incisal angle is a right angle for a maxillary central incisor?
mesioincisal
what incisal angle is a more rounded angle for a maxillary central incisor?
distoincisal angle
what is a junction of two tooth surfaces called?
line angle
what is a junction of three tooth surfaces called?
point angle
what is the cervical line / CEJ curved towards on a maxillary central incisor (facial)?
root apex
how many roots does a maxillary central incisor have?
single inverted cone shaped root (located slightly distal of long axis of tooth)
what is the lingual fossa bound by on a maxillary central incisor?
incisal edge, mesial and distal marginal ridges, cingulum
in what direction is the CEJ curved towards the root (lingually) for a maxillary central incisor?
convex
where does the incisal edge lay when the tooth is bisected longitudinally for a maxillary central incisor?
incisal edge lays on line
NEED TO REMEMBER - MAXILLARY CENTRAL INCISORS
the mesial cervical line has the greatest amount of curvature of any tooth in the mouth
NOTE - mesial curvature is greater than distal aspect
where is the point of convexity of the cingulum (incisal aspect) for a maxillary central incisor?
distal to the center of the lingual surface
how many pulp canals and pulp horns are present on a maxillary central incisor?
pulp canal - 1
pulp horns - 3 (disappear as a person ages)
how many lobes does a maxillary central incisor devleop from?
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
when is the first evidence of calcification for maxillary lateral incisors?
1 year
when is the enamel (crown) completed for maxillary lateral incisors?
4-5 years
when does eruption occur for maxillary lateral incisors?
8-9 years
when is the root completed for maxillary lateral incisors?
11 years
NEED TO REMEMBER - MAXILLARY LATERAL INCISORS
the maxillary lateral incisor varies in form more than any other tooth in the mouth
(exception - third molars)
NEED TO REMEMBER - MAXILLARY LATERAL INCISORS
maxillary lateral incisors are the most frequently congenitally absent ANTERIOR tooth
(third molars are more frequently congenitally absent tooth)
where is the mesial height of contour at on a maxillary lateral incisor?
junction of the middle and incisal 1/3’s
where is the distal height of contour at on a maxillary lateral incisor?
in middle 1/3
GENERAL NOTES ABOUT MAXILLARY LATERAL INCISORS
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
where is the greatest curvature on the facial and lingual surfaces of a maxillary lateral incisor?
cervical 1/3 (also true in central incisor)
which direction (mesial or distal) is the crest of the cingulum located when viewed from the incisal edge (maxillary lateral incisor)?
slightly to the distal of center of tooth
how many pulp canals does a maxillary lateral incisor have and how many pulp horns?
pulp canal - 1
pulp horns - 2
how many lobes does a maxillary lateral incisor develop from?
4 lobes
