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Dental Morphology > Lecture 4 Mandibular Incisors > Flashcards

Lecture 4 Mandibular Incisors Flashcards

1
Q

what are the numbers of the mandibular central incisors

A

24 and 25

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2
Q

what number is the right lateral mandibular incisor

A

23

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3
Q

what number is the left mandibular lateral incisor

A

26

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4
Q

what are embrasures

A

the spaces that widen out from the contact

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5
Q

what is the interproximal contact

A

where two adjacent teeth contact each other

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6
Q

what are the embrasure spaces of anterior teeth

A

incisal, gingival, facial, lingual

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7
Q

what are the embrasure spaces of the posterior teeth

A

occlusal, gingival, facial, lingual

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8
Q

what are the relationships between embrasures in the anterior teeth

A

-incisal < gingival
- facial = lingual

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9
Q

what are the relationships between embrasures in the posterior teeth

A
  • occlusal = gingival
  • facial < lingual
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10
Q

what makes up the gingival embrasure

A

the interdental papilla

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11
Q

what are mandibular incisors used for

A

incise or cut food

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12
Q

what tooth is the smallest tooth in the mouth

A

the mandibular central incisors

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13
Q

which incisors in the mandible are smaller

A

the central incisors

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14
Q

which tooth has the smallest mesiodistal diameters

A

mandibular central incisors

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15
Q

describe the relationship between buccolingual measurement and mesiodistal measurement of the mandibular incisors

A

broader buccolingually than mesiodistally

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16
Q

describe the shape of the mandibular central incisor from the facial view

A

trapezoidal, tapers cervically

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17
Q

describe the incisal outline of the mandibular central incisor

A

straight, mamelons are present when the tooth erupts

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18
Q

describe the mesioincisal and distoincisal angles of the mandibular central incisor

A

both are 90 degrees

19
Q

what tooth is the only symmetrical tooth in the mouth

A

mandibular central incisor

20
Q

where are the mesial and distal contact areas for the mandibular central incisor

A

both contacts are at the same level in the incisal 1/3

21
Q

describe the labial surface of the mandibular central incisor

A

-smooth, no developmental depressions
- flat in incisal 1/3 and becomes for convex cervically

22
Q

describe the root of the mandibular central incisor

A

single root, narrow mesiodistally, curves distally in some cases
- root length is greater than crown length

23
Q

describe the shape of the central incisor from the lingual view

A

-trapezoidal in outline
-smooth and rounded, slightly concave but no lingual fossa

24
Q

describe the ridges and the cingulum of the mandibular central incisor from the lingual view

A

-mesial and distal marginal ridges are only minor elevations
- cingulum is much less distinct than in the maxillary incisors
- no developmental grooves

25
Q

describe the shape of the mandibular central incisor from the mesial view and the height of contour

A

-triangular in outline
-labial outline is convex
- height of contour is in the cervical 1/3rd

26
Q

from the mesial view of the mandibular central incisor where does the incisal edge lie in respect to the line bisecting the root

A

lingual

27
Q

describe the CEJ of the mandibular central incisor from the mesial view

A

CEJ curves incisally about 1mm more than on the distal

28
Q

what happens to the mandibular central incisor when worn

A

the incisal edge angles to the facial

29
Q

describe the cervical line of the mandibular central incisor from the mesial aspect (Lingual vs labial)

A

cervical line extends 1mm more apically on the lingual than on the labial

30
Q

describe the root of the mandibular central incisor

A

extends straight from CEJ and tapers apically from middle 1/3
- may have broad developmental depression along its length (depression is greater on distal root than mesial)

31
Q

describe the differences of the mandibular central incisor from the distal view compared to the mesial view

A

-cervical lines curves incisally 1 mm less distally than on mesial
- developmental depression on distal of root is greater than on mesial

32
Q

describe the incisal edge in comparison to a line bisection the crown labiolingually of the mandibular central incisor

A

incisal edge is at right angles to the line
- incisal edge lies lingual to center of the tooth

33
Q

where are the contact areas of the mandibular central incisor from the incisal view

A

they are centered labiolingually

34
Q

describe the width of the labial surface vs the lingual surface from the incisal view of the mandibular central incisor

A

the MD width of the labial surface is wider than the MD width of the lingual surface

35
Q

describe the root and pulp of the mandibular central incisor

A

single root, root is broader FL than MD
- developmental depressions on mesial and distal (D > M)
-usually one pulp canal but 40% of population has 2 pulp canals (facial and lingual canals if 2)

36
Q

how is the mandibular lateral incisor bigger than the central incisor

A

wider MD than the central incisor, all extra width appears to be added to the distal aspect of the tooth

37
Q

describe the crown height of the mandibular lateral incisor from the facial view

A

distal crown height is often shorter than the mesial crown height, incisal edge slopes downward distally

38
Q

describe the distoincisal angle and the mesioincisal angle of the mandibular lateral incisor from the facial view

A

mesioincisal is 90
distoincisal is rounded

39
Q

where are the mesial and distal contacts of the mandibular lateral incisor from the facial view

A

incisal 1/3. distal contact is more cervical than the mesial

40
Q

describe the lingual view of the mandibular lateral incisor compared to the mandibular central incisor

A

same

41
Q

describe the difference between the distal view and mesial view of the mandibular lateral incisor

A

the distal aspect is twitsed lingually. the lingual surface is not visible from distal

42
Q

describe the incisal edge of the mandibular lateral incisor

A

lingual to the center of the tooth

43
Q

describe the distofacial line angle of the mandibular lateral incisor from the incisal view

A

DF is more lingual

44
Q

describe the pulp canal on the manibular lateral incisor

A

typically one canal, but can have 2 40% of the time

Dental Morphology (12 decks)

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