Widened PDL Space Significance — ORE Part 1 MCQ
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Correct answer: C — It is non-specific and requires correlation with clinical findings
Explanation lettering: B = shown as A · D = shown as B · A = shown as C · C = shown as D
A is correct because PDL-space widening is a non-specific radiographic sign, not a diagnosis. It can be seen with apical inflammatory change and with mechanical loading, including occlusal trauma or orthodontic movement; interpretation therefore depends on the clinical examination, tooth history and other radiographic features. SDCEP specifically requires radiographic findings to supplement clinical assessment and lists widened PDL spaces among features to record. B is incorrect because a radiograph cannot confirm irreversible pulpitis, and PDL widening is not confined to pulpal disease. C is incorrect because root fracture needs compatible clinical findings and radiographic features, often with altered horizontal angulation. D is incorrect because ankylosis is associated with loss or obliteration of the PDL space. E is incorrect because a widened space is not simply normal anatomy.
Reference: Scottish Dental Clinical Effectiveness Programme (SDCEP). Prevention and Treatment of Periodontal Diseases in Primary Care: Use of radiographs. Current webpage. https://www.periodontalcare.sdcep.org.uk/guidance/assessment/special-tests/use-of-radiographs/