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Dental Anatomy, Anterior Teeth > Maxillary Incisors > Flashcards

Maxillary Incisors Flashcards

1
Q

central maxillary incisors erupt

A

between 7-8 years of age

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2
Q

lateral maxillary incisors erupt

A

between 8-9 years of age

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3
Q

R max central incisor #

A

8

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4
Q

L max central incisor #

A

9

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5
Q

R max lateral incisor #

A

7

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6
Q

L max lateral incisor #

A

10

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7
Q

convex

A

bulges out at you like santa’s stomach or the side of a bubble

convexity or contour means rounded or bulging

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8
Q

concave

A

scooped out, hollow - think of a cave

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9
Q

describing “thirds”

A

can be used a number of ways -

CROWN
incisal third
middle third
cervical third (closest to CEJ)

CROWN
distal third
middle third
mesial third

ROOT
apical
middle
cervical

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10
Q

8/9 coronal dimensions (relatively)

A

inciso-coronal distance greater than mesio-distal distance (widest of all incisors)

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11
Q

8/9 crown to root ratio

A

close to 1

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12
Q

8/9 coronal outline

A
  • D more curved/convex, M more angular
  • D is more constricted/pinched in, like the tooth is wearing a belt
  • incisal edge can be flatter in adults due to grinding or can have mamelons
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13
Q

8/9 contacts

A

M in incisal third of crown

D at the junction of the incisal and middle thirds

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14
Q

8/9 angles

A

MI approx 90 deg

DI more rounded

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15
Q

8/9 CEJ

A

smooth, convex curve toward the apex of the root

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16
Q

8/9 cervical height of contour

A

means where the bulge of the tooth is the biggest!

it is biggest in the cervical one third, running mesiodistally (best seen from a proximal view)

17
Q

8/9 notable markings on facial

A

two developmental depressions sometimes evident in the middle and incisal thirds of the facial surface

18
Q

8/9 root

A

smoothly tapered
apex may curve distal or facial
smooth flat facial surface forms one side of the triangular root

19
Q

mamelons

A

developmental protuberances of enamel on the incisal edges of newly erupted teeth that represent lobes of development

often wear down with time

anterior teeth develop from 4 lobes - three on the facial, one forms the cingulum

20
Q

8/9 key differences from on lingual side

A
  • CEJ: smooth convex curve, not as apical as on the facial side (doesn’t curve as much)
  • prominent cingulum (4th lobe of development) displaced to the D to accommodate for incisive foramen
  • lingual fossa a concavity
  • two flattened surfaces of the root - forms a triangle
  • more of mesial surface of root is visible than distal (MESIAL OUTLINE OF ROOT IS LONGER IN CROSS SECTION)
  • triangular root unique to maxillary central incisors
21
Q

4 convexities on facial side of #8/9

A

M & D marginal ridges
cingulum
incisal ridge

22
Q

8/9 mesial view

A
  • facial height of contour in the cervical third
  • lingual height of contour in the cervical third (cingulum)
  • usu incisal edge is centered F-L and usually in line with center of apex
  • proximal contact - incisal third
23
Q

8/9 mesial view - CEJ notes

A

CEJ is curved toward the incisal edge - so concave toward the apex
*greater CEJ curvature on the mesial than the distal

24
Q

8/9 distal view

A
  • contact where the incisal third meets the middle third
  • heights of contact in cervical third again
  • CEJ less curved than M
  • crown might seem wider because tooth is curved a bit
  • flattened surface of root like M
  • smooth root
25
Q

8/9 incisal view / “down the barrel”

A
  • M/D greater than F/L
  • facial surface convex
  • lingual surface - tapered, cingulum to D
  • may see ridges on facial
  • straight line drawn over incisal edge from M to D
26
Q

maxillary lateral incisor differences from central incisor

A
  • all dimensions smaller except for a longer root
  • more rounded MI and DI edges
  • facial surface not as flat, developmental depressions not as prominent
27
Q

lingual view - lateral incisors compared

A
  • lingual concavities and convexities may be MORE pronounced

- root more tapered and more curved

28
Q

distolingual groove

A

a groove in a lateral incisor that can be a plaque trap - a developmental feature

29
Q

roots of lateral incisors

A
  • longer than central incisors
  • curves toward the distal but can curve toward facial or lingual
  • cross section is ovoid, not triangular
30
Q

peg-shaped laterals

A

smaller than normal, like little pegs, with smaller roots too
often don’t touch neighbors

31
Q

lingual tubercle

A

supersized cingulum

aka talon cusp

32
Q

random facts about max lateral incisors

A
  • possible to have a fused central and lateral!!
  • most often congenitally missing tooth
  • more variable shape/features

Dental Anatomy, Anterior Teeth (4 decks)

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