Edentulous Impression Technique — ORE Part 1 MCQ

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HardProsthodonticsEdentulous Impression TechniqueORE Part 1

A patient requires a conventional mandibular complete denture. After a preliminary impression and fabrication of a custom tray, which technique is most appropriate for the definitive functional impression?

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Correct answer: C — Border-moulded custom tray with selective relief and controlled pressure

Explanation lettering: C = shown as A · A = shown as C · E = shown as D · D = shown as E

Answer: A. A definitive functional mandibular impression should be made in a border-moulded custom tray that permits selective relief and controlled loading of the denture-bearing tissues. In a UK randomised crossover trial, patients significantly preferred lower dentures made from a selective-pressure impression technique. A custom tray also permits accurate border moulding and controlled material thickness. Option B is plausible but applies pressure indiscriminately, rather than accommodating areas requiring relief. Option C is appropriate as a preliminary impression method, but a stock tray does not provide the border control or selective pressure needed for the definitive impression. Options D and E similarly use stock trays and cannot reliably control extension, tissue displacement or pressure distribution.

Reference: Hyde TP, Craddock HL, Blance A, Brunton PA. A cross-over Randomised Controlled Trial of selective pressure impressions for lower complete dentures. Journal of Dentistry. 2010;38(11):853-858. https://pubmed.ncbi.nlm.nih.gov/20637826/