Justification & Interpretation

Question 1

Bitewings and paralleling periapicals

Answer 1

• similar techniques
• film is parallel to long axis of tooth
• x-ray beam at 90 degrees to film & tooth
• long cone should be used - a near parallel beam

Question 2

describe paralleling technique

Answer 2

• accurate images
• positioning devices determine the angulations
• reproducible on different visits by different operators
• relative positions of the film, teeth and x-ray beam are always maintained

Question 3

selection criteria

Answer 3

• systemically developed statements designed to assist the clinician and patient in making decisions about appropriate healthcare for certain specific circumstances
• guidelines are not a rigid constraint on clinical practice but concepts of good practice against which needs of individual patients can be considered

Question 4

recommended radiographs for uniform pocketing <6mm

Answer 4

horizontal bitewings

Question 5

recommended radiographs for pockets >6mm

Answer 5

vertical bitewings supplemented with parallel periapical views if perio-endo lesion suspected

Question 6

what radiographs would be utilised for irregular pocketing?

Answer 6

• bitewings +/- paralleling periapicals

Question 7

which radiographs to use for anterior teeth

Answer 7

paralleling periapicals

Question 8

what are some radiographic challenges?

Answer 8

• difficult to take paralleling films of mobile teeth
• difficult to use film holders & bite blocks if opposing teeth are missing
• full mouth periapical films have been considered the “gold standard” for periodontal disease but -
• always consider whether the taking of a radiograph is going to change the management of the patient