FREE RDA Dental Charting, Tooth Morphology, and Occlusion Questions and Answers

Question 1

Using the Universal Numbering System, which tooth is designated as #24?

Accepted Answer

Mandibular left central incisor

Answer

The Universal Numbering System starts with #1 as the maxillary right third molar and proceeds across the arch to #16 (maxillary left third molar). It then drops to the mandibular left third molar (#17) and continues to #32 (mandibular right third molar). Following this sequence, #24 is the mandibular left central incisor.

Question 2

What is the term for the V-shaped space between the proximal surfaces of two adjacent teeth?

Accepted Answer

Embrasure

Answer

An embrasure is the space that widens out from the interproximal contact area in four directions: occlusal/incisal, gingival, facial, and lingual. These spaces act as spillways for food during mastication, protecting the gingiva and reducing occlusal forces.

Question 3

A patient with an Angle's Class II, Division 1 malocclusion typically exhibits which characteristic?

Accepted Answer

Maxillary incisors that are proclined (flared out)

Answer

Angle's Class II malocclusion is defined by the mandible being in a distal relationship to the maxilla. The 'Division 1' subtype is specifically characterized by the maxillary incisors being proclined, or flared facially, which results in a significant overjet.

Question 4

When charting existing conditions in red, what does a solid red circle at the apex of a tooth root typically indicate?

Accepted Answer

A periapical abscess

Answer

In standard dental charting, red is often used to denote pathology or treatment that needs to be done. A solid or filled-in red circle at the root apex is the conventional symbol used to chart a periapical abscess, indicating an active infection requiring treatment.

Question 5

The non-functional, fifth cusp often found on the mesiolingual surface of a permanent maxillary first molar is called the:

Accepted Answer

Cusp of Carabelli

Answer

The Cusp of Carabelli is a supplementary, non-functional cusp located on the mesiolingual surface of the maxillary first molar. While not present on every individual, its presence is a common morphological trait for this specific tooth.

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FREE RDA Dental Charting, Tooth Morphology, and Occlusion Questions and Answers