Radiology for Dentists Exam

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Questions and Answers

Which structure do we call radiopaque?

for example a bone, calcification (correct)

every structure that appears dark on a sonograph

every structure that appears dark on a radiograph

Choose an incorrect statement about the inverted 'Y'-shaped configuration?

The inverted 'Y'-shaped configuration is an anatomical landmark

The inverted 'Y'-shaped configuration is a pathological image (correct)

The inverted 'Y'-shaped configuration is formed by the merging of the anterior border of maxillary sinus and the lateral wall of the nasal fossa. This configuration is seen in the canine or the premolar region

Osteomyelitis usually appears as

a radioopacity with definite borders (correct)

a radioopacity with ill defined borders

a radiolucency with ill defined borders

Which out of these structures appear white on a radiograph?

sialolith, exostosis, enostosis Signup and view all the answers

Choose a correct statement about sialography.

In case of stones within the duct, there will be filling defect distal to the site of obstruction. There can also be dilatation of the duct proximal to the obstruction. Signup and view all the answers

Which patient would you allow to undergo CT examination with contrast agent?

patient with hyperthyroidism Signup and view all the answers

Choose a correct statement about the dental cone beam imaging?

an x-ray beam with a cone-shaped is moved around the patient to produce a large amount of images. Signup and view all the answers

Choose the correct statement about MRI?

heart pacemaker is a contraindication for MRI Signup and view all the answers

Choose an incorrect statement about arthrography?

Arthrography may reveal soft tissue changes not visualized in conventional radiographs, such as fibrosis, alteration in the structure of the disk, scarring and fibrosis of the capsule following trauma, and as part of evaluation after TMJ surgery. Signup and view all the answers

The advantage of this method lies in ability to be used in patients who cannot open the mouth or when the opening is restricted?

the advantage of this method lies in ability to be used in patients who cannot open the mouth or when the opening is restricted Signup and view all the answers

Intraoral radiography is

an imaging technique to visualize oral structures taken by placing film in oral cavity while an Xray source is outside oral cavity Signup and view all the answers

Is an imaging technique to visualize oral structures taken by placing the film and an X ray source outside of the oral cavity.

is an imaging technique, which uses the central x-ray beam directed perpendicular to an imaginary bisector that bisects the angle formed by the long axis of the tooth and the film Signup and view all the answers

This technique requires more exposure.

This technique requires more exposure Signup and view all the answers

3 basic views used in intraoral radiography are

periapical view, bitewing view, occlusal view Signup and view all the answers

Is an image that depicts the maxillary and mandibular crowns of the teeth, providing a clear image of the interproximal surfaces of the teeth and allowing for detection of interproximal caries.

is an image that depicts the maxillary and mandibular crowns of the teeth, providing a clear image of the interproximal surfaces of the teeth and allowing for detection of interproximal caries. Signup and view all the answers

Choose a correct statement?

The indication for using occlusal projection is to study maxillary and mandibular arches. Signup and view all the answers

Dental caries appears as

radiolucent Signup and view all the answers

Choose a correct statement about dental caries?

cervical burnout might radiographically resemble dental caries Signup and view all the answers

Periodontal diseases

an important factor helping in the diagnosis of periodontal disease is the radiographic relationship of cementoenamel junction (CEJ) with the crest of the alveolus. Signup and view all the answers

Choose an incorrect statement about trauma?

The radiographic features of fracture of the jaws is a fracture line which radiographically appears as a radioopaque line. Signup and view all the answers

Choose a correct statement about cysts?

Radiographically cysts appear as radiolucent. Signup and view all the answers

Choose a correct disease of the TMJ for this description: narrowing of the joint space, irregular joint space, subchondral sclerosis, cyst-like areas, osteophytes, facet formation on the condylar head?

degenerative joint disease Signup and view all the answers

Choose an incorrect statement about Barium sulfate suspension?

It is a contrast media usually administered intravenously. Signup and view all the answers

Codman's triangle is associated with:

Destructive bone cancer Signup and view all the answers

Claudication pains are:

Lower limb pain after exertion, and later also at rest Signup and view all the answers

During contrast MR examination:

Organo-specific and non-specific gadolinium contrast agents Signup and view all the answers

Rays x (X-rays) discovered:

Wilhelm Conrad X-ray Signup and view all the answers

A contraindication to CT angiography is:

Positive allergic history for iodine preparations Signup and view all the answers

We are the first to indicate a USG investigation on suspicion of:

Cholecystolithiasis Signup and view all the answers

To examine the abdominal organs we use:

Convex probe Signup and view all the answers

The essence of the USG examination is:

The ability of USG waves to penetrate and reflect tissue structures Signup and view all the answers

Liver biopsy under USG or CT:

Is carried out as a method of choice because it is highly safe Signup and view all the answers

Study Notes

Examination for Dentists

Radiopaque Structures: Structures that appear dark on a radiograph are called radiopaque, examples include bones and calcifications.
Inverted 'Y' Configuration: This configuration is formed by the merging of the anterior border of the maxillary sinus and the lateral wall of the nasal fossa. It's an anatomical landmark, typically seen in the canine or premolar region.
Osteomyelitis: Appears as a radioopacity with ill-defined borders on a radiograph.
Radiographic White Structures: Sialoliths, exostoses, and enostoses appear white on a radiograph. Odontogenic keratocysts are also white.
Sialography: A procedure that can be used to detect stones (filling defects distal to the obstruction), and duct dilatation in the case of stones within the duct. Patients with acute parotitis, or Sjögren's Syndrome should not undergo the procedure.
CT Examination with Contrast Agent: Should be avoided in pregnant patients, patients with hyperthyroidism, and those with acute head injury, and suspected subarachnoid hemorrhage.
Dental Cone Beam Imaging: A technique that uses a cone-shaped X-ray beam. This produces a large amount of images and used in orthodontics. It is useful in visualizing the temporomandibular joint.
MRI Contraindications: Dental implants, heart pacemakers are contraindications for MRI. MRI is useful to differentiate malignant tissue from normal tissue.

Further Imaging Techniques

Arthrography: A contrast agent injected into the joint, radiographed to identify soft tissue changes like fibrosis, disk alterations or joint capsule damage.
Panoramic Radiography: Advantageous in patients who cannot open their mouths, and provides better view of the dental arches.
Intraoral Radiography - Paralleling Technique: Uses an X-ray beam perpendicular to an imaginary line bisecting the tooth axis, and is used to create periapical (but not bitewing) projections
Intraoral Radiography - Bisecting Angle Technique: A technique that keeps the film close to the teeth for increased exposure.
Occlusal Projection: Used for extra-oral radiography.

Diseases and Their Radiographic Appearance

Dental Caries: Appears radiolucent.
Periodontal Diseases: Radiographs show horizontal bone loss and osseous defects, and the relationship of the cementoenamel junction to crest of the alveolus.
Dental Trauma: Radiographs display a radiolucent line between segments, and displacement of fragments.
Cysts: Appear radiolucent, often with sclerotic or hyperostotic borders.
Tumors: Appears as diffuse radioopacity (intraosseus carcinoma), multilocular cyst-like lesion (ameloblastoma) or unilocular lesion (adenomatoid odontogenic tumor)
Cervical Burnout: Might radiographically resemble caries, but it has a different configuration.

Other Important Information

MRI: On a T2-weighted image, gray matter appears darker than white matter.
Barium Sulfate Suspension: Used for gastrointestinal tract visualization, usually orally or rectally.

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Description

Test your knowledge on radiopaque structures, inverted configurations, and the significance of various radiographic findings in dentistry. This quiz covers essential concepts such as osteomyelitis and sialography procedures that are crucial for dental radiology practice.