Orthodontics and paediatric dentistry: Andrews six keys: 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: Andrews six keys

Sample item

Andrews' six keys to normal occlusion describe features seen in a naturally ideal occlusion. Which of these is NOT one of the six keys?

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

The answer and the reasoning

C. Normal overjet of 2 to 3 mm

Andrews' six keys are molar relationship, crown angulation, crown inclination, absence of rotations, tight contacts without spacing, and a flat or slightly curved occlusal plane. Overjet is a clinical measure but not one of the keys. Key I, the molar relationship, is the one that corresponds to Angle's description.

Option by option

  • A. Flat occlusal plane

    A flat occlusal plane is the sixth key.

  • B. Correct molar relationship

    Molar relationship is Key I.

  • C. Normal overjet of 2 to 3 mm (correct)

    Correct. Overjet is not among the six keys.

  • D. Correct crown angulation

    Crown angulation is a key.

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, Normal overjet of 2 to 3 mm. Andrews' six keys are molar relationship, crown angulation, crown inclination, absence of rotations, tight contacts without spacing, and a flat or slightly curved occlusal plane.

Why is "Flat occlusal plane" not the answer?

A flat occlusal plane is the sixth key.

Why is "Correct molar relationship" not the answer?

Molar relationship is Key I.

Why is "Correct crown angulation" not the answer?

Crown angulation is a key.

What concept does this question test?

It tests Orthodontics and paediatric dentistry: Andrews six keys in Dentistry. Overjet is a clinical measure but not one of the keys. Key I, the molar relationship, is the one that corresponds to Angle's description.

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: Andrews six keys?

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.