Mandibular Incisors

Question 1

1. When do the mandibular central incisors erupt?
2. When are they initially calcified

Answer 1

1. 6-7 yrs
2. 3-4 mo

Question 2

1. When do the mandibular lateral incisors erupt?
2. When are they initially calcified?

Answer 2

1. 7-8 yrs
2. 3-4 mo

Question 3

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

Answer 3

Laterals (centrals are smallest teeth in the mouth)

Question 4

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

Answer 4

They have the same crown length

Question 5

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

Answer 5

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

Question 6

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

Answer 6

Laterals (barely, .5mm more)

Question 7

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

Answer 7

1. Mesiodistal Dimension
2. Central (smallest tooth of the mouth)
3. Mammelons

Question 8

1. What is the outline form of the mandibular central incisor from the labial aspect?
2. The incisal edge is usually _____ after wear

Answer 8

1. Trapezoidal
2. Straight

Question 9

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

Answer 9

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

Question 10

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

Answer 10

Marginal

Question 11

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

Answer 11

Minimal in size, centered on the lingual aspect

Question 12

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

Answer 12

Triangular

Question 13

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

Answer 13

Cervical Third

Question 14

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

Answer 14

Mesially

Question 15

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

Answer 15

Lingually

Question 16

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

Answer 16

Facially (slopes toward cervical line on facial side)

Question 17

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

Answer 17

Diamond Shaped

Question 18

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

Answer 18

Centered over the root

Question 19

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

Answer 19

Perpendicular

Question 20

From the mandibular central incisors are symmetrical _________

Answer 20

Bilaterally (straight edges)

Question 21

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?

Answer 21

1. Oval
2. Mostly straight
3. Depressions (grooves)

Question 22

1. How many pulp cavities are on the mandibular central incisor?
2. Where is the largest portion of the pulp cavities?

Answer 22

1. 1 but sometimes 2 (makes root canals difficult)
2. Cervically, then tapers apically

Question 23

1. Are there common morphologic variations on the mandibular incisors?
2. What are the 2 notable things about it?

Answer 23

1. No
2. Uniform development
3. Two canals in one single root

Question 24

Which teeth are often lost first due to periodontal disease?

Answer 24

Mandibular central incisors (small root)

Question 25

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?

Answer 25

1. Larger
2. More rounded

Question 26

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

Answer 26

Distal

Question 27

Are the mandibular lateral incisors symmetrical bilaterally?

Answer 27

No.

Question 28

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

Answer 28

Distal proximal contact is located more cervically

Question 30

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

Answer 30

Distal

Question 31

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

Answer 31

Cervically

Question 32

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

Answer 32

The lateral central incisal edge looks twised on its root base

Question 33

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

Answer 33

No, because it’s twisted

Question 34

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

Answer 34

1. Mandibular Arch

Question 35

1. How many canals do the lateral mandibular incisors have?
2. The root narrows towards the ____
3. Where is the pulp cavity largest?

Answer 35

1. 1 or 2
2. Incisal
3. Cervically, tapers apically

Question 37

Are there morphological variations on the lateral mandibular incisors?

Answer 37

Just having two roots