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Dental Morphology > Incisors > Flashcards

Incisors Flashcards

1
Q

Number of incisors in each quadrant

A

2 incisors in each quadrant: 1 central 1 lateral
Total 8 incisors

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2
Q

Do the central and lateral incisors of the same arch have more similarities

A

Yes

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3
Q

Do the mx central and mn central incisors have more similarities

A

No

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4
Q

General difference of maxillary vs mandibular incisors

A

Mx larger than mn
In the mn arch: mn LI larger than CI
In the mx arch: mx CI larger than LI

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5
Q

Function of incisors

A
  • mastication
  • aesthetics
  • speech
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6
Q

Numbers of incisors

A

FDI: 11 12, 21 22, 31 32, 41 42
Universal numbering system 7 8 9 10 etc
Palmers notation similar to fdi with that L shaped thing to determine which quad is it in

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7
Q

General dimensions of mx ci

A

labial view
Overall length: 24.3mm
Root > crown by 2-3mm
Crown length > crown width
mesial view
incisocervical crown dimension > labiolingual crown dimension by 3-4.1mm

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8
Q

Mx ci crown dimension labial view

A

Incisocervical dimension > mesiodistal dimension

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9
Q

Mx ci labial crown outline form common exam qn

A

Trapezoidal

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10
Q

Incisal edge of ci

A

Almost straight mesiodistally except for mamelons in newly erupted incisors

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11
Q

Mesioincisal angle vs disto incisal angle labial view

A

Mesioincisal angle is sharper than distoincisal angle
Mesioincisal angle is almost 90 degrees but still ACUTE
Distoincisal angle is more rounded, OBTUSE

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12
Q

contacts of mx ci

A

Mesial proximal contact: incisal 1/3 near mesioincisal angle
mesial proximal contact is roughly ovoid (hence greater incisocervical dimension)
Distal proximal contact: incisal 1/3 near junction with middle 1/3
distal proximal contact is smaller and located more cervically than the mesial proximal contacct

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13
Q

distal vs mesial outline of crown (clue: the mesioincisal vs distoincisal angle)

A

distal outline is more convex and curved than the mesial surface
mesial surface is almost straight

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14
Q

got developmental depressions? mx ci

A

yes, 2 labial developmental depressions fading out in mid 1/3 of crown

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15
Q

labial heights of contour of mx ci

A

m shaped, outline giving rise to the 2 labial depressions
height of contour on labial surface is on the cervical 3rd of the tooth

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16
Q

mx ci got imbrication lines?

A

yes at the cervical 3rd of tooth

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17
Q

root form features of mx ci

A

cone shaped tapering palatally, broader mesiodistally on the labial surface
cross section of a rounded triangle becoming ovoid at midroot
apex is relatively blunted

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18
Q

mx ci crown outline form from incisal view

A

roughly triangular

19
Q

mx ci incisal edge

A

relatively straight, slightly curved mesiodistally
distance between the labioincisal and linguoincisal ling angle is 1.5 to 2mm

20
Q

mx ci lingual fossa ?

A

yes, one shallow and big concavity incisal 1/2 to 2/3 of the palatal surface

21
Q

mx ci lingual surface characteristics other than the large ass fossa

A

marginal ridge marking the mesial and distal borders of the tooth -> rmb u had a hard time making this
mesial marginal ridge just like the mesial surface of the crown (when looked at labially) is nearly straight , having greater incisocervical dimension than distal marginal ridge which is more curved
accessory ridge in a W shape, not everyone has (64%)

22
Q

mx ci cingulum

A

cingulum definition: rounded convex prominence at palatal cervical 3rd
located towards distal
is broad mesiodistally

23
Q

trait of central incisors that are different from other teeth

A

ci are usually the only teeth that do not occlude with the opposing teeth when jaws are closed

24
Q

mx ci crown outline form from mesial surface

A

triangle, wedge shaped, chisel shaped

25
Q

incisal ridge position on mx ci

A

based on the mesial view, incisal edge lies on the long axis of the tooth / labial to it

26
Q

incisal edge or incisal ridge?

A

incisal ridge is usually in newly erupted tooth and often with mamelons
incisal edge is a rather flattened and sharp surface typically after tooth use

27
Q

cej cementonamel junction (hint: main difference from other teeth)

A

curvature is even towards the incisal
cej on mx ci shows greatest depth of curve compared to any tooth surface (mesial)

28
Q

mesial view labial surface traits vs palatal surface outline of mx ci

A

usually incisal 2/3 is flat for labial surface
usually concave at incisal 2/3 and convex at cervical 1/3 for lingual surface

29
Q

what are shovel shaped incisors?

A

used to describe mx incisors with deep lingual fossa and prominent marginal ridges

30
Q

where is the lingual height of contour on the mx ci? (imagine the palatal surface)

A

cervical 1/3

31
Q

difference between mesial and distal surface of the mx ci

A

distal surface is shorter and more convex incisocervically
cej on the distal surface is less deep than on the mesial surface (mesial surface cej of mx ci shows greatest depth compared to any other tooth)

32
Q

mx li crown outline form in labial view

A

trapezoidal

33
Q

general dimensions of mx li

A

narrower than mx ci
root length > crown length

34
Q

mx li trends

A

greater morphological variation in the facial crown shape
crown roundness

35
Q

compare w mx ci

distal vs mesial outline form of mx li crown in labial view

A

distal outline form of mx li is more rounded than mesial
but both are rounder than in the mx ci

36
Q

also compare w mx ci

mesio vs distoincisal angle of mx li

A

mesioincisal angle is more rounded than in mx ci but it is still an acute angle
same for distoincisal angle with the roundness, but it is still an obtuse angle

37
Q

also compare with mx ci

mesial vs distal proximal contacts on mx li

A

**both are ** more cervically located than in mx ci
mesial prox contact is still located more coronal than distal prox contact
mesial prox contact is located at the junction of incisal 3rd w mid 3rd = ovoid
distal prox contact is in mid 3rd

38
Q

are there facial developmental depressions and imbrication lines on mx li though?

A

YES

39
Q

Incisal view of mx li

A

rhomboidal appearance of a canine with mesio distal dimension > faciolinguo dimension

40
Q

mesial vs distal marginal ridges of mx li

A

mesial marginal ridge longer and straighter than distal marginal ridge just like in mx ci

41
Q

compare with mx ci

what makes the lingual fossa of mx li different?

A

deeper and smaller -> harder to clean
frequently has a palatal or lingual pit at the incisal border of the cingulum

42
Q

height of contour of mx ci

A

cervical 3rd of the tooth

43
Q

is it very different from the mx ci?

where is the incisal ridge / edge located on the mx li?

A

along long axis of the tooth or just labial to it just like in mx ci

44
Q

difference from mx ci?

mesial crown outline form of mx li

A

triangular, v shaped, wedge shaped. chisel shaped

Dental Morphology (4 decks)

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