Orthodontics and paediatric dentistry: single anterior crossbite appliance: 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 and paediatric dentistry: single anterior crossbite appliance

Sample item

An 8-year-old has a single upper central incisor locked lingual to the lower incisors, with enough space and adequate overbite. Which simple removable appliance corrects this?

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

The answer and the reasoning

B. Hawley appliance with a Z-spring

A removable appliance with a finger or Z-spring on the palatal side of the incisor tips it labially into correct overjet, provided there is space and overbite to hold the correction. Quad helix expands the arch, headgear acts on the maxilla and lip bumpers act on the lower arch.

Option by option

  • A. Cervical pull headgear

    Cervical headgear restrains the maxilla or distalises molars.

  • B. Hawley appliance with a Z-spring (correct)

    Correct. A Z-spring on a removable plate tips the incisor labially.

  • C. Quad helix expander

    A quad helix expands the maxillary arch and does not tip a single incisor.

  • D. Lower lip bumper

    A lip bumper acts on the lower arch and does not move an upper incisor.

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 B, Hawley appliance with a Z-spring. A removable appliance with a finger or Z-spring on the palatal side of the incisor tips it labially into correct overjet, provided there is space and overbite to hold the correction.

Why is "Cervical pull headgear" not the answer?

Cervical headgear restrains the maxilla or distalises molars.

Why is "Quad helix expander" not the answer?

A quad helix expands the maxillary arch and does not tip a single incisor.

Why is "Lower lip bumper" not the answer?

A lip bumper acts on the lower arch and does not move an upper incisor.

What concept does this question test?

It tests Orthodontics and paediatric dentistry: single anterior crossbite appliance in Dentistry. Quad helix expands the arch, headgear acts on the maxilla and lip bumpers act on the lower arch.

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 Orthodontics and paediatric dentistry: single anterior crossbite appliance?

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.