M2 Quiz #1 - DH Dental Anatomy/Tooth Morphology (DHYG1430-Concorde)

How many teeth in the complete adult dentition have a labial surface?

Twelve (12)

How many total molars are there in the complete adult human dentition?

Twelve (12)

On incisors, the number of lobes on the facial surface (which is the same as the number of mamelons on the incisal surface) is:

Three

Ridges that form the mesial and distal borders on the lingual surface of anterior teeth and the occlusal surface of posterior teeth:

Marginal ridges

All incisors have a mesioincisal (mesial) angle more square and the distoincisal (distal) angle more rounded. Which type is the EXCEPTION?

Mandibular central incisor

Though smaller than the maxillary incisors, mandibular incisors also have _____ (total number) lobes.

Four (4)

True or false? The mesial contact of the mandibular lateral incisor is closer to the incisal edge than the distal contact.

True

When viewed from the proximal, what is the location of the height of contour (widest area) on the facial surface of all teeth?

cervical third (closer to CEJ)

This tooth has the shortest root relative to its crown (crown to root ratio):

maxillary central incisor

Which of the following are the anatomic features of permanent maxillary central incisors?

1. Cingulum

2. Mamelons

3. Marginal ridges

4. Occlusal surface

1, 2, and 3

Which of the following is a unique characteristic of the maxillary lateral incisor?

All of the above *Correct answer*

- Deep lingual fossa ( Shovel shaped)

- More common to have a lingual pit- prone to decay

- Most likely to have a deep root groove on the lingual side

- Most likely to be "peg-shaped" known as a peg lateral

Which incisors have more prominent lingual anatomy, maxillary incisors or mandibular incisors?

maxillary incisors

Which of the following is true about incisor roots?

All of the above *correct answer*

- roots taper from cervical to apex (cone shaped)

- incisor roots are longer than their crowns

- incisor roots tend to bend toward the distal ( except the straight maxillary central incisor root)

What shape are incisor crowns when viewed from the labial/facial?

rectangle

When viewed from the proximal (from mesial or distal), what shape is the incisor crown?

Triangular