NDEB Dental Anatomy and Occlusion 3

Question 1

The Wilson curve is best described as:

Accepted Answer

The lateral curve formed through the buccal and lingual cusp tips of mandibular posterior teeth

Answer

The Wilson curve (curve of Wilson) is the mediolateral curvature formed by the buccal and lingual cusp tips of mandibular posterior teeth in the frontal plane.

Question 2

Fremitus in dentistry refers to:

Accepted Answer

Palpable or visible vibration in a tooth when the patient taps or slides the teeth together

Answer

Fremitus is the vibration detected by placing a finger on the facial surface of a tooth while the patient performs occlusal or excursive contacts, indicating excessive occlusal force on that tooth.

Question 3

The long axis of a tooth is defined as:

Accepted Answer

The axis running from the cusp tip or incisal edge to the root apex

Answer

The long axis of a tooth runs from the highest point of the crown (cusp tip or incisal edge) through the center of the tooth down to the root apex.

Question 4

Overjet is defined as:

Accepted Answer

The horizontal distance between the labial surface of the maxillary incisors and the labial surface of the mandibular incisors

Answer

Overjet is the horizontal (sagittal) distance measured from the labial surface of the mandibular central incisor to the labial surface of the maxillary central incisor.

Question 5

The ideal vertical overlap (overbite) of maxillary over mandibular incisors in normal occlusion is approximately:

Accepted Answer

2–4 mm

Answer

A normal overbite of approximately 2–4 mm (covering about 20–30% of the mandibular incisor crown) is considered ideal in a Class I occlusion.

NDEB - National Dental Examining Board Practice Test

NDEB - National Dental Examining Board Practice Test

NDEB Dental Anatomy and Occlusion 3