NBDE Dental Anatomy and Occlusion 2

Question 1

Which cusp of the maxillary first molar is the smallest and least functional?

Accepted Answer

Cusp of Carabelli

Answer

The cusp of Carabelli is an accessory cusp on the mesiolingual surface of the maxillary first molar and is the smallest, non-functional cusp.

Question 2

The mandibular first premolar differs from the second premolar in that it has:

Accepted Answer

A prominent mesiolingual developmental groove

Answer

The mandibular first premolar has a prominent mesiolingual developmental groove that divides its occlusal surface, distinguishing it from the second premolar.

Question 3

During protrusive mandibular movement, which contacts are ideally present in a mutually protected occlusion?

Accepted Answer

Only anterior tooth contacts

Answer

In mutually protected occlusion, protrusive movements are guided by anterior teeth, which disclude the posteriors to prevent wear.

Question 4

Which root of the maxillary first molar is most likely to be in close proximity to the maxillary sinus?

Accepted Answer

Palatal root

Answer

The palatal root of the maxillary first molar is the longest and most often projects into or near the floor of the maxillary sinus.

Question 5

The angle formed between the long axis of a tooth and the occlusal plane is referred to as the:

Accepted Answer

Cusp angle

Answer

Cusp angle is the angle formed by a line from cusp tip to base of the cusp in relation to the occlusal plane, influencing occlusal forces.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Dental Anatomy and Occlusion 2