Dental materials and radiology basics: bisecting angle errors: 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: bisecting angle errors

Sample item

A periapical film of an upper molar taken by the bisecting angle technique shows the tooth looking much longer than it is. What was the error?

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

The answer and the reasoning

A. Vertical angulation too small

A small vertical angle elongates the image, whereas a large vertical angle foreshortens it. Horizontal error causes overlapping of contacts.

Option by option

  • A. Vertical angulation too small (correct)

    Correct. Insufficient vertical angulation elongates the image.

  • B. Cone cutting

    Cone cutting produces an unexposed clear area on the film.

  • C. Incorrect horizontal angulation

    A horizontal error overlaps adjacent teeth.

  • D. Vertical angulation too large

    Excessive vertical angulation causes foreshortening.

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, Vertical angulation too small. A small vertical angle elongates the image, whereas a large vertical angle foreshortens it.

Why is "Cone cutting" not the answer?

Cone cutting produces an unexposed clear area on the film.

Why is "Incorrect horizontal angulation" not the answer?

A horizontal error overlaps adjacent teeth.

Why is "Vertical angulation too large" not the answer?

Excessive vertical angulation causes foreshortening.

What concept does this question test?

It tests Dental materials and radiology basics: bisecting angle errors in Dentistry. Horizontal error causes overlapping of contacts.

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: bisecting angle errors?

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.