Oral pathology: cysts and odontogenic tumours: adjunct in keratocyst surgery: practice question

A Dentistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dentistry · Oral pathology: cysts and odontogenic tumours: adjunct in keratocyst surgery

Sample item

A 28-year-old has a large keratocyst in the mandibular ramus that recurred after simple enucleation. At re-operation, which adjunct is applied to the bony cavity to chemically fix residual epithelium and lower the recurrence rate?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Carnoy's solution

The keratocyst has a thin friable lining and may leave daughter cysts, so enucleation alone has a high recurrence. Peripheral ostectomy or application of Carnoy's solution, a fixative containing ethanol, chloroform and acetic acid, kills residual epithelium and lowers recurrence.

Option by option

  • A. Carnoy's solution (correct)

    Correct. Carnoy's solution chemically fixes residual epithelium in the bone.

  • B. Tranexamic acid paste

    Tranexamic acid reduces bleeding and does not treat the lining.

  • C. Bone wax packing

    Bone wax controls bleeding from bone and does not treat the lining.

  • D. Chlorhexidine irrigation

    Chlorhexidine is an antiseptic and does not destroy residual cyst epithelium.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is A, Carnoy's solution. The keratocyst has a thin friable lining and may leave daughter cysts, so enucleation alone has a high recurrence.

Why is "Tranexamic acid paste" not the answer?

Tranexamic acid reduces bleeding and does not treat the lining.

Why is "Bone wax packing" not the answer?

Bone wax controls bleeding from bone and does not treat the lining.

Why is "Chlorhexidine irrigation" not the answer?

Chlorhexidine is an antiseptic and does not destroy residual cyst epithelium.

What concept does this question test?

It tests Oral pathology: cysts and odontogenic tumours: adjunct in keratocyst surgery in Dentistry. Peripheral ostectomy or application of Carnoy's solution, a fixative containing ethanol, chloroform and acetic acid, kills residual epithelium and lowers recurrence.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Oral pathology: cysts and odontogenic tumours: adjunct in keratocyst surgery?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.