Orthodontics: leeway space: 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 · Orthodontics: leeway space

Sample item

In mixed dentition analysis, the sum of primary canine and molar widths exceeds that of their permanent successors in the lower arch. What is this extra space called?

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

The answer and the reasoning

D. Leeway space

Leeway space is the surplus in width of the primary canine and molars compared with the permanent canine and premolars, being larger in the mandible. It helps resolve mild crowding.

Option by option

  • A. Physiological space

    Physiological spaces are generalised gaps between primary incisors.

  • B. Primate space

    Primate spaces are gaps in the primary dentition mesial to upper canines and distal to lower canines.

  • C. Freeway space

    Freeway space is the interocclusal gap at rest.

  • D. Leeway space (correct)

    Correct. This surplus is the leeway space.

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 D, Leeway space. Leeway space is the surplus in width of the primary canine and molars compared with the permanent canine and premolars, being larger in the mandible.

Why is "Physiological space" not the answer?

Physiological spaces are generalised gaps between primary incisors.

Why is "Primate space" not the answer?

Primate spaces are gaps in the primary dentition mesial to upper canines and distal to lower canines.

Why is "Freeway space" not the answer?

Freeway space is the interocclusal gap at rest.

What concept does this question test?

It tests Orthodontics: leeway space in Dentistry. It helps resolve mild crowding.

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 Orthodontics: leeway space?

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.