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Dental Anatomy > Maxillary central incisors > Flashcards

Maxillary central incisors Flashcards

1
Q

What is the main function of an incisor in general?

A

1) Cut Food
2) Articulate Speech
3) Support Lip and Maintain Appearance
4) Guide Mandible During Jaw Movements
5) Contain an incisal ridge/edge instead of cusps or occlusal surfaces!

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2
Q

What is the main function of an incisor in general?

A

1) Cut Food
2) Articulate Speech
3) Support Lip and Maintain Appearance
4) Guide Mandible During Jaw Movements
5) Contain an incisal ridge/edge instead of cusps or occlusal surfaces!

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3
Q

What is an incisal ridge?

A

Incisal ridge makes up ALL of the incisal portion of the crown,

Note: newly erupted teeth have an incisal ridge- that has a round manner (connects facial and lingual surface and the mesio and disto-incisal angle)

Put the incisors to use, flat surface forms linguoincisally this forms an edge with labial surface.

Just really know that it was originally round (ridge) and with use, overtime it became straight (edge)

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4
Q

Incisal Edge

A

Formed by the junction of the linguoincisal surface and the labial surface!

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5
Q

Mamelon

A

More defined on newly erupted Maxillary Central Incisors!

*Still on lateral incisors, not as prominent

But, defined as scallops on incisal edge centered beneath the three facial lobes!

Peep the other features on the pic!

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6
Q

Developmental Depressions/Grooves/Lines

A

Two Shallow Vertical depressions that divide the labial surface into 3 portions!

Typically extend from the incisal edge to the middle 3rd on the labial/facial surface

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7
Q

Perikymata

A

Fine horizontal lines on the crown surface– typically in newly erupted teeth!

Dope nickname: Striae of Retzius

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8
Q

Common Traits to ALL Incisors

A
  • Rectangular- Longer than wide!
    -Taper from proximal regions to cervical
  • more convex distal surface than mesial
    -mesioincisal angle is more square than distoincisal angle
    -distal contact is more CERVICAL than mesial
    -Roots taper towards the lingual and toward the apex
  • Roots are generally wider Faciolingually and Mesiodistally (except- symmetrical on maxillary central)
    -Roots can bend towards distal
    -Roots are longer than crowns!
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9
Q

Even more common trends– don’t get too caught up on these!

A
  • crowns taper from proximal contact area to lingual/cervical- like said on last slide
  • Mesial and Distal marginal ridges converge on the cingulum
    -Cervical lines are looking like humps (arches to apex) on the facial and lingual side
  • CEJ curve toward the incisal, more prominent on mesial
  • Facial and Lingual Heights of Countour/Crest of Curvature is in the cervical 3rd!
    -S-Shaped lingual outline- viewed on the mesial and distal sides
    -Facial is less convex than lingual from the incisal view- probably because the cingulum is thick and stands out more!
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10
Q

Maxillary Central Incisor #8 and #9

A

24- Mandibular Left Central Incisor

8 is Maxillary Right
9 is Maxillary Left

-Larger than the neighbor- lateral incisor

Mesial side of 8 contacts with the Mesial side of 9!

Only other teeth in the mouth that do this is Mesial side of #24 with Mesial side of #25

#25- Mandibular Right Central Incisors

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11
Q

Anamolies of Maxillary Centrals

A

-Longer Crown
-Shorter Root

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12
Q

Statistic Questions: md fl

A

M-D > F-L

The Root is Longer than the Crown!

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13
Q

First Calcification:

A

3-4 Months

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14
Q

enamel comletion

A

4-5 years

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15
Q

tooth eruption

A

7-8 years

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16
Q

rootsompletion

A

9-10

17
Q

TOOTH ERUPTION

A

7-8 years

18
Q

root completion

A

9-10 years

19
Q

mesial

A

I 1/3

20
Q

distal

A

Junction of the incisal/middle third

21
Q

facial

A

c 1/3

22
Q

lingual

A

c 1/3

23
Q

Facial Surface

A

-Widest of all ANTERIOR teeth (thats why MD>FL)
-Labial/Facial is less convex, retains a squared/rectangular shape
*Mesial Incisal Slightly longer than the distal incisal, also more of a sharp angle rather than round.
– One way to know that measurement is to start at the mesial incisal angle on the lingual surface and draw a line up to the cingulum- shows that it is longer than distal incisal angle.

-Mesial side of crown is more straight, while the distal is more curved. - Distal doesn’t skip legs

24
Q

If you were a mamelon on a central incisor which one would you be?

A

Definitely not the middle because its the smallest.

Peep the developmental lines/grooves/depressions that we talked about earlier.

25
Q

Root on Facial

A

Root from facial is cone shaped- blunt apex slightly distal to a bisecting line (likes to curve to distal)

But remember- root is symmetrical on central incisor! But Conical Looking

26
Q

Lingual Surface

A

Irregular- but reverse of the facial outline

Majority of the Middle and Incisal Portion is concave due to the lingual fossa.

Don’t forget about the pronounced mesial and lateral marginal ridges

Cervically you have a cingulum

Exaggeration of marginal ridges you be looking like a snow shovel

IDENTIFY ALL LOCATIONS

27
Q

What tapers lingually?

A

The Crown and Root

28
Q

Mesioincisal Angle or Distoincisal Angle– which is longer?

A

Mesioincisal Angle

29
Q

Mesial Surface View- What shape do you have?

A

Wedge Shape-Triangle
Crown shape, base at cervix, apex at incisal edge

If a bisecting line was drawn from the middle of the tooth it will pass through the apex of root and incisal edge.

30
Q

Facial and Lingual aspects from the Mesial view?

A

Facial is SLIGHTLY convex

Lingual starts off as convex, concave, and convex (think of cervical, thoracic, lumbar)

31
Q

CEJ on Mesial

A

Noticeable curve TOWARDS the incisal edge- actually the greatest curvature compared to ever tooth in the mouth!

32
Q

Root on Mesial

A

Still looking like a traffic cone, with a blunt rounded apex

33
Q

Distal Surface

A

Resembles the mesial quite nice, but since the curvature of the arch, the facial/labial looks a little more thick in the incisal third.

34
Q

Incisal Aspect

A

When viewed from the incisal aspect, the edge is centered over the tooth.

No ROOT is visible, thanks to the cingulum being too thick

Facial surface is broad and flat compared to lingual.

Lingual outline tapers to the cingulum- how’d you know?

35
Q

Incisal Aspect

A

Bilateraly Coast 2 Coast, it is relatively uniform when comparing the mesial and distal.

Triangular outline matches the root outline

Dental Anatomy (17 decks)

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