DMD DMD - Doctor of Medicine in Dentistry Dental Radiology and Imaging Questions and Answers 2

Question 1

Cone beam computed tomography (CBCT) provides what primary advantage over conventional 2D radiography in dentistry?

Accepted Answer

Three-dimensional imaging with reduced radiation compared to medical CT

Answer

CBCT generates accurate 3D volumetric data of hard tissues with a radiation dose significantly lower than medical CT, making it valuable for implant planning, endodontics, and oral surgery.

Question 2

On a periapical radiograph, condensing osteitis appears as which radiographic finding?

Accepted Answer

Radiopaque (dense) area around the apex of a tooth

Answer

Condensing osteitis is a focal sclerosing reaction of bone to low-grade pulpal inflammation, appearing as increased bone density (radiopacity) periapically.

Question 3

The bisecting angle technique uses which geometric rule to determine beam angulation?

Accepted Answer

The central ray is directed perpendicular to the bisector of the angle formed by the tooth and the film

Answer

The bisecting angle technique applies the rule of isometry: the beam is aimed at 90° to an imaginary line that bisects the angle between the tooth and the receptor.

Question 4

Which radiographic landmark appears as a radiopaque bow-shaped line above the roots of the maxillary posterior teeth on a periapical radiograph?

Accepted Answer

Floor of the maxillary sinus

Answer

The floor of the maxillary sinus appears as a radiopaque curved line that can overlie or be near the apices of the maxillary premolars and molars on periapical X-rays.

Question 5

What is the primary purpose of using a long-cone (PID) technique in periapical radiography?

Accepted Answer

To reduce image magnification and increase sharpness by increasing the source-to-film distance

Answer

A longer cone increases the source-to-object distance, reducing beam divergence and image magnification, which results in a sharper and more dimensionally accurate image.

DMD - Doctor of Medicine in Dentistry Practice Test

DMD - Doctor of Medicine in Dentistry Practice Test

DMD DMD - Doctor of Medicine in Dentistry Dental Radiology and Imaging Questions and Answers 2