Mandibular Incisors Flashcards

1
Q
  1. When do the mandibular central incisors erupt?
  2. When are they initially calcified
A
  1. 6-7 yrs
  2. 3-4 mo
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2
Q
  1. When do the mandibular lateral incisors erupt?
  2. When are they initially calcified?
A
  1. 7-8 yrs
  2. 3-4 mo
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3
Q

Which teeth are bigger, the lateral or central mandibular incisors?

A

Laterals (centrals are smallest teeth in the mouth)

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4
Q

Which have a larger crown length, lateral or central mandibular incisors?

A

They have the same crown length

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5
Q

Which have a longer root length, mandibular centrals or laterals?

A

Laterals (since crown length is the same for central and lateral, root length must be longer for laterals)

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6
Q

Which has a larger mesiodistal crown width, mandibular centrals or laterals?

A

Laterals (barely, .5mm more)

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7
Q
  1. Mandibular incisors have the smallest ______ dimension of all the teeth
  2. Which tooth is smaller, central or lateral mandibular incisor?
  3. ______ on the incisal ridge are worn soon after eruption
A
  1. Mesiodistal Dimension
  2. Central (smallest tooth of the mouth)
  3. Mammelons
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8
Q
  1. What is the outline form of the mandibular central incisor from the labial aspect?
  2. The incisal edge is usually _____ after wear
A
  1. Trapezoidal
  2. Straight
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9
Q

Where are the mesial and distal contact points of the mandibular central incisors?

A

The incisial third for both! They are at the same height.

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10
Q

On the mandibular central incisors, the lingual aspect has a very weakly developed ______ ridges

A

Marginal

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11
Q

On the mandibular central incisor, describe the size and orientation of the cingulum

A

Minimal in size, centered on the lingual aspect

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12
Q

From the proximal aspect, what is the crown outline form of the mandibular central incisors?

A

Triangular

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13
Q

From the proximal aspect, on the mandibular central incisor, where is the height of contour lingually and facially?

A

Cervical Third

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14
Q

On the mandibular central incisors, the CEJ has incisal curvature when viewed from the proximal aspect. Is the insisal curvature greater mesially or distally?

A

Mesially

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15
Q

On the mandibular central incisors, the incisal edge is located FACIALLY/LINGUALLY to the center of the root

A

Lingually

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16
Q

On the mandibular central incisor, viewed from the proximal aspect, the incisal edge inclines FACIALLY/LINGUALLY

A

Facially (slopes toward cervical line on facial side)

17
Q

What is the crown outline form of the mandibular central incisors from the incisal aspect?

A

Diamond Shaped

18
Q

Where is the incisal ridge located on the mandibular central incisors?

A

Centered over the root

19
Q

On the mandibular central incisors, the incisal edge is located in what orientation to the faciolingual bisector line?

A

Perpendicular

20
Q

From the mandibular central incisors are symmetrical _________

A

Bilaterally (straight edges)

21
Q
  1. The cross sectional root form of the mandibular central incisors is shaped like an…
  2. Is the root of mandibular central incisors curved or straight?
  3. What are present proximally on the root?
A
  1. Oval
  2. Mostly straight
  3. Depressions (grooves)
22
Q
  1. How many pulp cavities are on the mandibular central incisor?
  2. Where is the largest portion of the pulp cavities?
A
  1. 1 but sometimes 2 (makes root canals difficult)
  2. Cervically, then tapers apically
23
Q
  1. Are there common morphologic variations on the mandibular incisors?
  2. What are the 2 notable things about it?
A
  1. No
  2. Uniform development
  3. Two canals in one single root
24
Q

Which teeth are often lost first due to periodontal disease?

A

Mandibular central incisors (small root)

25
Q
  1. The mandibular lateral incisors resemble the central incisors but are _______ in most dimensions
  2. Are the laterals less or more rounded than the centrals?
A
  1. Larger
  2. More rounded
26
Q

On the mandibular lateral incisors, when viewed labially, the incisal edge may slope towards the MESIAL/DISTAL

A

Distal

27
Q

Are the mandibular lateral incisors symmetrical bilaterally?

A

No.

28
Q

How are the contact points of the mandibular lateral incisors different than the central incisors?

A

Distal proximal contact is located more cervically

29
Q
A
30
Q

On the mandibular lateral incisors, the cingulum may be shifted towards the MESIAL/DISTAL

A

Distal

31
Q

From the proximal aspect the central and lateral incisors are the same except the distal contact is located more _____ than the mesial

A

Cervically

32
Q

What is the most important difference regarding the lateral mandibular incisors when compared with the central lateral incisors?

A

The lateral central incisal edge looks twised on its root base

33
Q

On the mandibular lateral incisors, does the incisal edge form a right angle with the faciolingual crown bisecting line?

A

No, because it’s twisted

34
Q
  1. When viewed incisally, the incisal edge of the manibular lateral incisors follows the curvature of the _____
  2. The root axis parallels the central incisor root and the incisal edge follows the arch curvature
A
  1. Mandibular Arch
35
Q
  1. How many canals do the lateral mandibular incisors have?
  2. The root narrows towards the ____
  3. Where is the pulp cavity largest?
A
  1. 1 or 2
  2. Incisal
  3. Cervically, tapers apically
36
Q
A
37
Q

Are there morphological variations on the lateral mandibular incisors?

A

Just having two roots

38
Q
A