Specific facts on incisors

Question 1

What is ratio of the root to crown ratio of maxillary central incisor?

Answer 1

Crown and roots are closer to the same length

Question 2

Which teeth have their cingula set off-center?

Answer 2

Maxillary central incisor
Mandibular lateral incisor
Maxillary canine

Question 3

What is the effect of cingula on the maxillary central incisor?

Answer 3

Mesial marginal ridge is longer than distal marginal ridge

Question 4

Even though the cingulum is not off-centered for the maxillary lateral incisor, why is the mesial marginal longer than distal marginal ridge?

Answer 4

Mesial marginal ridge is longer but it’s due to the incisal edge of the lateral incisor.

Question 5

When the cingulum of the maxillary central incisor is pointed downwards, what happens to the incisal edge?

Answer 5

The incisal edge has a slight distolingual twist with the distoincisal corner more lingual than the mesioincisal corner.

Question 6

When the cingulum of the maxillary lateral incisor is pointed downwards, what happens to the incisal edge?

Answer 6

The incisal edge runs mesiodistally with no twist.

Question 7

What is the effect, when a line bisects the cingulum of the mandibular lateral incisor?

Answer 7

It creates a slight distolingual twist on the incisal edges of the lateral incisor.

Question 8

Which direction does the crown of the mandibular incisor tip compared to the root?

Answer 8

It tips slightly to the distal.

Question 9

Which anterior teeth has a lingual pit?

Answer 9

Maxillary lateral incisor

Question 10

What is the shape of the root cross-section of the maxillary incisors?

Answer 10

Round

Question 11

What is the shape of the root cross-section of the mandibular incisors?

Answer 11

Ribbon-like (thin mesiodistally and wider faciolingually)

Question 12

Where are incisal edges of maxillary incisors located compared to root axis line?

Answer 12

Incisal edges are located more labial to the root axis line

Question 13

Where are incisal edges of mandibular incisors located compared to root axis line?

Answer 13

Incisal edges are located more lingual to the root axis line.

Question 14

When comparing the proximal contacts of the maxillary anterior teeth and the proximal contacts of the mandibular teeth, which set has its proximal contacts locate more incisally?

Answer 14

The proximal contacts of the Mandibular teeth

Question 15

When viewed from the proximal view, which cervical line is positioned more apically than facial cervical line?

Answer 15

Lingual cervical line - apical