Radiographic Interpretation of Oral Pathology in Dogs and Cats

The diagnostic tools used to demonstrate oral pathology include:

Periodontal probe

Intraoral (dental) radiographs

Dental explorer

Plaque disclosing solution

All of the above are useful diagnostic tools

The bisecting angle technique for dental radiographs:

Is only used for taking extraoral radiographs

Greatly magnifies the image onto the film

Can ONLY be used in the caudal mandible

Causes foreshortening of the object onto the radiographic film

None of the above

The parallel technique for dental radiographs:

Can only be used successfully in the rostral mandible

Is performed by aiming the x-ray beam parallel to the film

Requires a lot less radiation exposure than the bisecting angle technique

Is performed by aiming the X-ray beam parallel to the tooth being investigated

None of the above

How would one determine with the use of intraoral (dental) radiographs, whether endodontic disease is occurring in a tooth?

Look for a radiodense area at the apex of the tooth

Look for a narrowing of the pulp canal within the root

Look for a radiodense area in the coronal pulp of the tooth

Look for a widening of the periodontal ligament space at the cervical enamel junction of the tooth

Look for evidence of loss of or widening of the periodontal ligament space around the apex of the tooth

On an intraoral (dental) radiograph, if a radiolucent area exists over the apex of a tooth root, what can be done to determine whether this lucency is associated with the apex of the tooth root or not?

If this lucency is present, then it is ALWAYS associated with dental pathology

Perform an X-ray tube shift, to see if the lucency moves away from the apex

Look at the surrounding teeth to compare

Do nothing: a radiolucency involving the apex of the tooth is normal

Always take an extraoral radiograph to compare

What special technique(s) can be used to radiograph the maxillary 4th premolar in the cat

a) It is the same technique as used in dogs

b) Bisecting angle technique with vertical angulation of the X-ray tube causing shortening of the 4th premolar roots

c) A parallel technique of the tooth, to move the zygoma more dorsally

d) Both b. and c.

e) None of the above

Intraoral (dental) radiographs of Type 2 tooth resorptions in cats

a) Show a loss of the tooth’s normal radiodensity

b) Show a partial or complete loss of the periodontal ligament space surrounding the root

c) ALWAYS show an increased radiolucency within the crown of the tooth

d) Show increased radiodensity in the alveolar bone surrounding the tooth

e) a and b are correct

Periodontitis can be seen on intraoral (dental) radiographs as

Angular boner loss

Horizontal bone loss

Often a combination of both angular and horizontal bone loss

Affecting the palatal plate of alveolar bone more that the buccal plate of alveolar bone

None of the above are correct

The radiographic appearance of oronasal fistula in dogs can be seen

As a loss of the labial plate of alveolar bone adjacent to the maxillary canine tooth

As a loss of the palatal plate of alveolar bone affecting the maxillary third incisor tooth

ALWAYS as an increased radiodensity of the alveolar bone on the palatal side of the maxillary canine tooth

A loss of the lingual alveolar bone adjacent to the mandibular canine tooth

By ONLY taking a lateral radiographic view of the rostral maxilla

Too steep a vertical angulation when taking a lateral intraoral (dental) radiographic view of the maxillary 4th premolar tooth in the dog can cause

A shortening of the roots of the maxillary 4th premolar tooth

An elongation of the roots of maxillary 4th premolar tooth

ALWAYS causes superimposition of the maxillary 1st molar tooth over the maxillary 4th premolar tooth

Exposes the dog to more radiation compared to a bisecting angle technique of the maxillary 4th premolar tooth

None of the above are correct

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Radiographic Interpretation of Oral Pathology in Dogs and Cats