INBDE Oral Radiology & Imaging practice questions

Question 1

A dentist is reviewing a set of bitewing radiographs and notices that the images are consistently too dark (high density), although the contrast is acceptable. Which of the following adjustments would most effectively correct this for the next patient?

Accepted Answer

Decrease the exposure time or mA

Answer

Decrease the kVp

Answer

Increase the source-to-object distance

Answer

Increase the kVp

Question 2

A 45-year-old patient requires a full-mouth series. The dentist utilizes a rectangular collimator instead of a circular one. This change most significantly reduces patient radiation dose by reducing which of the following?

Accepted Answer

The volume of tissue irradiated

Answer

The energy of the primary beam

Answer

The exposure time required for a diagnostic image

Answer

The amount of leakage radiation from the tube head

Question 3

While performing the bisecting angle technique for a maxillary canine, the clinician directs the vertical angulation of the X-ray beam too steeply (excessive vertical angulation). What will be the resulting error on the image?

Accepted Answer

Foreshortening of the tooth

Answer

Elongation of the tooth

Answer

Overlapping of the interproximal contacts

Answer

A cone-cut error

Question 4

A routine periapical radiograph of the mandibular premolar region reveals a well-defined, round radiolucency located near the apex of the second premolar. The lamina dura of the second premolar is intact, and the tooth responds normally to vitality testing. What is the most likely identity of this radiolucency?

Accepted Answer

Mental foramen

Answer

Periapical cyst

Answer

Lateral periodontal cyst

Answer

Submandibular fossa

Question 5

A patient presents for a post-operative checkup. A periapical radiograph shows an 'inverted Y' landmark in the maxillary arch. This landmark represents the junction of which two structures?

Accepted Answer

The floor of the nasal fossa and the anterior border of the maxillary sinus

Answer

The zygomatic process and the floor of the maxillary sinus

Answer

The hard palate and the nasal septum

Answer

The nasolacrimal duct and the maxillary sinus

Question 6

When interpreting interproximal caries on a bitewing radiograph, which of the following is true regarding the radiographic appearance compared to the actual clinical extent of the lesion?

Accepted Answer

The radiograph tends to underestimate the depth of the lesion

Answer

The radiograph tends to overestimate the depth of the lesion

Answer

The radiograph is an exact representation of the lesion's depth

Answer

Caries are only visible on radiographs once they have reached the pulp

Question 7

Which of the following radiographic techniques is considered the most accurate for assessing the height of the alveolar crestal bone in a patient with generalized 5mm to 6mm pocket depths?

Accepted Answer

Vertical bitewings

Answer

Horizontal bitewings

Answer

Panoramic radiograph

Answer

Bisecting angle periapicals

Question 8

A 22-year-old patient presents for the evaluation of an unerupted mandibular third molar. A panoramic radiograph shows a well-defined, unilocular radiolucency attached to the cementoenamel junction (CEJ) of the tooth. What is the most likely diagnosis?

Accepted Answer

Dentigerous cyst

Answer

Odontogenic keratocyst (OKC)

Answer

Ameloblastoma

Answer

Radicular cyst

Question 9

According to the ALARA principle, which of the following is the primary justification for taking a Cone-Beam Computed Tomography (CBCT) scan in a dental setting?

Accepted Answer

When 2D imaging is insufficient to provide necessary diagnostic information for treatment

Answer

As a routine screening tool for all new patients

Answer

To evaluate interproximal caries when bitewings are inconclusive

Answer

To reduce the amount of time the patient spends in the chair

Question 10

A panoramic radiograph shows a 'flat' or 'frowning' occlusal plane and the hyoid bone superimposed over the mandible. Which patient positioning error most likely caused this?

Accepted Answer

The patient's chin was tilted too high

Answer

The patient's chin was tilted too low

Answer

The patient was positioned too far forward

Answer

The patient was positioned too far back

INBDE Oral Radiology & Imaging practice questions

A dentist is reviewing a set of bitewing radiographs and notices that the images are consistently too dark (high density), although the contrast is acceptable. Which of the following adjustments would most effectively correct this for the next patient?

A 45-year-old patient requires a full-mouth series. The dentist utilizes a rectangular collimator instead of a circular one. This change most significantly reduces patient radiation dose by reducing which of the following?

While performing the bisecting angle technique for a maxillary canine, the clinician directs the vertical angulation of the X-ray beam too steeply (excessive vertical angulation). What will be the resulting error on the image?

A patient presents for a post-operative checkup. A periapical radiograph shows an 'inverted Y' landmark in the maxillary arch. This landmark represents the junction of which two structures?

When interpreting interproximal caries on a bitewing radiograph, which of the following is true regarding the radiographic appearance compared to the actual clinical extent of the lesion?

Which of the following radiographic techniques is considered the most accurate for assessing the height of the alveolar crestal bone in a patient with generalized 5mm to 6mm pocket depths?

A 22-year-old patient presents for the evaluation of an unerupted mandibular third molar. A panoramic radiograph shows a well-defined, unilocular radiolucency attached to the cementoenamel junction (CEJ) of the tooth. What is the most likely diagnosis?

According to the ALARA principle, which of the following is the primary justification for taking a Cone-Beam Computed Tomography (CBCT) scan in a dental setting?

A panoramic radiograph shows a 'flat' or 'frowning' occlusal plane and the hyoid bone superimposed over the mandible. Which patient positioning error most likely caused this?

The first 10 are free. 4 more below.

Which of the following radiation dose-response models is the basis for radiation protection standards in dentistry, suggesting that there is no 'safe' threshold for cancer induction?

In the production of X-rays, increasing the tube current (mA) results in which of the following?

A radiograph of the mandibular molar area shows a well-defined, corticated radiolucency located below the inferior alveolar nerve canal. The lesion is asymptomatic and has not changed in size for several years. What is the most likely diagnosis?

Which type of X-ray interaction with matter is primarily responsible for generating the contrast between different tissues (like enamel and pulp) on a dental radiograph?