MJDF Orthodontics

Question 1

According to Angle's classification, Class II Division 1 malocclusion is characterised by which of the following?

Accepted Answer

Proclined upper incisors with increased overjet

Answer

Class II Division 1 features a distal molar relationship with proclined upper incisors and characteristically increased overjet.

Question 2

What is the normal ANB angle in a balanced skeletal relationship as measured on a lateral cephalogram?

Accepted Answer

2–4°

Answer

The normal ANB angle is 2–4°, reflecting a typical forward position of the maxilla relative to the mandible.

Question 3

The lower incisor to mandibular plane angle (IMPA) has a UK mean value of approximately:

Accepted Answer

93°

Answer

The UK mean IMPA is approximately 93° (±6°), reflecting the normal proclination of lower incisors relative to the mandibular plane.

Question 4

Which index is used within the NHS in the UK to assess a patient's eligibility for orthodontic treatment?

Accepted Answer

Index of Orthodontic Treatment Need (IOTN)

Answer

The IOTN grades dental health and aesthetic components and is the standard used by the NHS to determine whether patients qualify for funded orthodontic care.

Question 5

During which stage of dental development is interceptive orthodontic treatment most commonly initiated?

Accepted Answer

Mixed dentition stage

Answer

The mixed dentition stage is the optimal window for interceptive treatment, allowing early correction before all permanent teeth have erupted.

MJDF Part 1 Practice Test

MJDF Part 1 Practice Test

MJDF Orthodontics