DRC Case Analysis & Practical Application 2

Question 1

A radiograph of a 45-year-old patient reveals a well-defined radiolucent lesion at the apex of a non-vital maxillary lateral incisor. The lesion measures 12mm in diameter. What is the MOST likely diagnosis?

Accepted Answer

Periapical cyst

Answer

Periapical cysts are the most common odontogenic cysts and are associated with non-vital teeth; lesions larger than 10mm are more likely to be cysts than granulomas.

Question 2

During a full-mouth radiographic survey, the dental hygienist notices a horizontal radiolucent line crossing the roots of the mandibular molars. What artifact is most likely responsible?

Accepted Answer

Mach band effect

Answer

The Mach band effect is an optical illusion where a dark band appears at the junction of structures of differing densities, commonly seen crossing molar roots.

Question 3

A panoramic radiograph of a 12-year-old shows an impacted mandibular third molar bud superimposed over the inferior alveolar canal. Which additional imaging would best assess the spatial relationship?

Accepted Answer

CBCT imaging

Answer

CBCT provides 3D spatial information to precisely determine the relationship between an impacted tooth and the inferior alveolar canal.

Question 4

A patient's bitewing radiograph shows loss of the distinct white line of the lamina dura around the mesial root of tooth #30. Which condition should be suspected?

Accepted Answer

Periapical pathology

Answer

Loss of the lamina dura around a root apex is a radiographic sign of periapical inflammation or infection.

Question 5

On a periapical film of the maxillary molar region, a radiopaque structure with a root-like shape is seen superior to the apex of tooth #2. What is this most likely representing?

Accepted Answer

Zygomatic process of the maxilla

Answer

The zygomatic process of the maxilla frequently appears as a U- or J-shaped radiopaque structure superimposed over the maxillary molar roots.

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

DRC Case Analysis & Practical Application 2