Dental materials and radiology basics: stochastic effect of radiation: 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 · Dental materials and radiology basics: stochastic effect of radiation

Sample item

A radiographer is concerned about very low cumulative exposure. Which effect is considered stochastic, with probability rising with dose and no assumed safe threshold?

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

The answer and the reasoning

C. Radiation-induced malignancy

Stochastic effects occur by chance, their probability rises with dose and their severity does not, and no threshold is assumed; cancer induction and heritable effects are examples. Deterministic effects such as erythema, epilation and mucositis have a threshold dose and become more severe with dose.

Option by option

  • A. Epilation of the scalp

    Epilation needs a threshold dose and is deterministic.

  • B. Radiation mucositis

    Mucositis is a deterministic tissue reaction with a threshold and graded severity.

  • C. Radiation-induced malignancy (correct)

    Correct. Carcinogenesis is the classic stochastic effect without a safe threshold.

  • D. Skin erythema

    Erythema is deterministic, appearing only above a threshold dose.

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 C, Radiation-induced malignancy. Stochastic effects occur by chance, their probability rises with dose and their severity does not, and no threshold is assumed; cancer induction and heritable effects are examples.

Why is "Epilation of the scalp" not the answer?

Epilation needs a threshold dose and is deterministic.

Why is "Radiation mucositis" not the answer?

Mucositis is a deterministic tissue reaction with a threshold and graded severity.

Why is "Skin erythema" not the answer?

Erythema is deterministic, appearing only above a threshold dose.

What concept does this question test?

It tests Dental materials and radiology basics: stochastic effect of radiation in Dentistry. Deterministic effects such as erythema, epilation and mucositis have a threshold dose and become more severe with dose.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. 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 Dental materials and radiology basics: stochastic effect of radiation?

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.