Obturator Prosthesis — ORE Part 1 MCQ
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Correct answer: E — To close the defect and re-establish oral–nasal separation
Explanation lettering: D = shown as A · E = shown as C · C = shown as D · A = shown as E
A is correct. A maxillectomy may leave a communication between the oral and nasal cavities. An obturator closes this acquired defect, restoring separation of the two cavities and helping rehabilitation of speech, swallowing, mastication and facial appearance. B is incorrect because local cytotoxic therapy is not the function of a prosthodontic obturator. C is incorrect because recurrence prevention depends on oncological surgery, pathology-directed adjuvant treatment and surveillance, not prosthetic obturation. D is incorrect because an obturator is not primarily a radiotherapy shield. E is incorrect because implants can sometimes assist retention of a prosthesis, but implant support is not the primary purpose of the obturator itself.
Reference: Keyf F. Obturator prostheses for hemimaxillectomy patients. Journal of Oral Rehabilitation, 2001. https://pubmed.ncbi.nlm.nih.gov/11580820/