LO 5 - Mand Incisors

Question 1

Give a brief overview of mandibular Central incisors

Answer 1

1. They are the smallest teeth in the mouth
2. Amandibular central incisor occludes only with one opposing tooth, a maxillary central incisor
3. Drive from four lobes, three facial and one lingual
4. When they erupt, mamelons can be seen on the incisal ridge
5. Of all the teeth, they are the most difficult to identify as either right or left

Question 2

What are four features of mandibular Central incisors that are not always obvious, but if present, they may support a good guess?

Answer 2

1. The distoincisal angle is just slightly greater than the mesioincisal
2. The distofacial line angle is more rounded than the mesofacial
3. The cervical line crests slightly toward the distal side
4. The missiofacial line angle is longer than the distofacial line angle

Question 3

When is there evidence of calcification for mandibular Central incisors?

Answer 3

3 months of age

Question 4

Mandibular Central incisors tend to erupt around __________

Answer 4

6 to 7 years of age

Question 5

When is the root completed for mandibular Central incisors?

Answer 5

9 years

Question 6

Where are the proximal contact areas for mandibular Central incisors?

Answer 6

1. Mesial - incisal third
2. Distal - incisal third

Question 7

Where is the height of contour for mandibular Central incisors?

Answer 7

1. Facial - cervical third
2. Lingle-cervical third

Question 8

How many popcorns does a mandibular central incisor have?

Answer 8

Three

Question 9

How many developmental lobes does a manipulative Central Insider have?

Answer 9

4 - 3 facial, 1 lingual

Question 10

Describe the labial aspect of mandibular Central incisors

Answer 10

1. Very smooth facial surface
2. Mesioincisal outline is almost straight
3. Mesial and distal Heights of contour are at the incisal third
4. Crown is wider faciolingually than mesiodistally

Question 11

Describe the lingual aspect of the mandibular central incisor

Answer 11

1. Singulum is much smaller than that of the maxillary anteriors
2. No tubercle extensions or lingual pits are evident
3. Fossa is very shallow

Question 12

Describe the mesial and distal aspects of the mandibular central incisor

Answer 12

1. Incisal Edge appears to be tilted toward the lingual side
2. May have more cervical curvature on the mesial side

Question 13

Describe the root and pulp cavity of the mandibular central incisor

Answer 13

1. Single rooted - straight
2. Oval shaped one looked at in cross section
3. Proximal grooves are commonly found on the root surface
4. Pulp cavity is simple
5. Usually have three popcorns and a single root canal
6. Root canal is straight and narrow
7. Rare, but not possible to have two root canals

Question 14

Give a brief overview of mandibular lateral incisors

Answer 14

1. Mandibular lateral incisors are bigger, wider, and longer than mandibular centrals
2. They are wider mesiodistally and longer gingivo-incisally
3. Distal developmental lobe is larger than the distal lobe of the mandibular centrals
4. They have more prominent features on the lingual aspect then do central incisors
5. The lateral incisors are slightly more convex and concave than Central incisors
6. Have greater facial curvature than the central incisors
7. The mesiofacial line angle is longer than the distofacial line angle

Question 15

When is there evidence of calcification for the mandibular lateral incisor?

Answer 15

1. 4 months of age

Question 16

When do mandibular lateral incisors tend to erupt?

Answer 16

7 to 8 years of age

Question 17

When do the roots of mandibular lateral incisors complete?

Answer 17

10 years of age

Question 18

Where are the proximal contact areas on the mandibular lateral incisors?

Answer 18

1. Mesio - incisal third
2. Distal - incisal third

Question 19

Where is the height of contour for the mandibular lateral incisors?

Answer 19

1. Facial - cervical third
2. Lingual - cervical third

Question 20

How many pulp horns does a mandibular lateral Insider have?

Answer 20

3

Question 21

How many developmental lobes does a manipulated lateral incisor have?

Answer 21

4 - 3 facial, 1 lingual

Question 22

Describe the labial aspect of mandibular lateral incisors

Answer 22

1. More rounded appearance misially and distally
2. Developmental grooves are all deeper on the lateral incisors
3. The height of contour at the contact areas is at the incisal third on the mesial and distal
4. More convex labially

Question 23

Describe the lingual aspect of the mandibular lateral incisors

Answer 23

1. Shows more prominent features than mandibular Central incisors
2. Riches are more developed, and enamel tubercles often extend into the fossa
3. A lingual pit is sometimes present

Question 24

Describe the mesial and distal aspects of mandibular lateral incisors

Answer 24

1. Height of contour on the labial and lingual surfaces is at the cervical third
2. Lateral incisor is thicker than a central incisor at the linguoincisal ridge
3. More narrow labio-lingually
4. Cervical curvature is greater on the mesial then on the distal side

Question 25

Describe the incisal aspect of the mandibular lateral incisor

Answer 25

1. Rounded general appearance and the developmental groups appear deeper
2. Rotated on the root axis, because the distal developmental lobe is larger and located more lingually than the mesio lobe
3. Lingual location means for the laterals have to curve distillate to fit into the mandibular Arch
4. Mandibular Arch curves more than maxillary because it has to fit inside the maxillary Arch

Question 26

Describe the root and pulp cavity of the mandibular lateral incisor

Answer 26

1. Root is slightly wider, thicker and longer than the central incisor
2. Apex may point labially or distally
3. Proximal grooves are focused on the root surface- distal is deeper
4. Three pulp horns
5. Mandibular lateral pulp canal is larger than Centrals
6. rare to have two root canals