Occlusal

Question 1

How many types of maxillary occlusal radiographs are there?

Answer 1

• Upper standard occlusal (60 70˚)
• Upper oblique occlusal

Question 2

How many types of mandibular occlusal radiographs are there?

Answer 2

• Lower 90⁰ occlusal (true occlusal)
• Lower 45⁰ occlusal
• Lower oblique occlusal

Question 3

Name some indications for maxillary occlusal radiography

Answer 3

• Periapical assessment of teeth (if cannot
  tolerate IOPA)
• Detecting presence of pathology (#, cysts)
• Parallax for unerupted teeth
• Fractures of teeth/alveolar bone
• Assessment of antrum/roots displaced/ max tuberosities (oblique)

Question 4

When do we use a thyroid collar?

Answer 4

When taking UPPER maxillary occlusal’s

Question 5

Name some indications for mandibular occlusal radiography

Answer 5

• Presence of radiopaque calculi in submandibular salivary ducts
• Buccolingual position on teeth/pathology
• Expansion caused by tumours/cysts
• Fracture displacement of the anterior mandible in horizontal plane (true 90 degrees)
• Assess mandible width prior to implant placement

Question 6

Which type of occlusal is this?

Answer 6

Lower 90 (true) occlusal

Question 7

Name some clinical indications for lower 45/anterior occlusals

Answer 7

*Periapical assessment of the lower incisor teeth, especially useful in adults and children unable to tolerate periapical image receptor holders
*Evaluation of the size and extent of lesions such as cysts or tumours affecting the anterior part of the mandible
*Assessment of fracture displacement of the anterior mandible in the vertical plane.

Question 8

Name some indications of lower oblique occlusal radiographs

Answer 8

Allows display of submandibular SG on the side of interest
(note: as x-ray beam is oblique, all the anatomical tissues shown are distorted)

Detection of radiopaque calculi in the submandibular salivary gland of interest
Assessment of the bucco-lingual position of unerupted lower wisdom teeth
Evaluation of the extent and expansion of cysts, tumours or other bone lesions in the posterior part of the body and angle of the mandible.

Question 9

The lower oblique occlusal radiographic film is also mounted with the embossed dot pointing ??? from the examiner.

Answer 9

Away