Orthodontics and paediatric dentistry: IOTN: 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.

Try it

Dentistry · Orthodontics and paediatric dentistry: IOTN

Sample item

A treatment need index has a dental health component graded 1 to 5 and an aesthetic component judged with ten ranked photographs. Which index is this?

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

The answer and the reasoning

A. Index of Orthodontic Treatment Need

The Index of Orthodontic Treatment Need (Brook and Shaw) has a dental health component graded from 1 to 5 and an aesthetic component scored using ten photographs. It is used to prioritise treatment need. The PAR index, in contrast, measures outcome by comparing scores before and after treatment.

Option by option

  • A. Index of Orthodontic Treatment Need (correct)

    Correct. The dental health grades and the photograph scale define this need index.

  • B. Peer assessment rating index

    The PAR index scores occlusal deviation to judge treatment outcome and has no photographic scale.

  • C. Decayed, missing and filled teeth index

    The DMFT index measures caries experience, not orthodontic need.

  • D. Little's irregularity index

    Little's index measures lower anterior crowding only.

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.

More Dentistry questions

Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is A, Index of Orthodontic Treatment Need. The Index of Orthodontic Treatment Need (Brook and Shaw) has a dental health component graded from 1 to 5 and an aesthetic component scored using ten photographs.

Why is "Peer assessment rating index" not the answer?

The PAR index scores occlusal deviation to judge treatment outcome and has no photographic scale.

Why is "Decayed, missing and filled teeth index" not the answer?

The DMFT index measures caries experience, not orthodontic need.

Why is "Little's irregularity index" not the answer?

Little's index measures lower anterior crowding only.

What concept does this question test?

It tests Orthodontics and paediatric dentistry: IOTN in Dentistry. It is used to prioritise treatment need. The PAR index, in contrast, measures outcome by comparing scores before and after treatment.

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: IOTN?

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.