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

Retroclined upper central and lateral incisors with deep overbite

Answer

Lower incisor edge occluding with upper incisor palatal surfaces

Answer

Crossbite of the upper first molars

Question 2

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

Accepted Answer

2–4°

Answer

0°

Answer

6–8°

Answer

10–12°

Question 3

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

Accepted Answer

93°

Answer

82°

Answer

87°

Answer

102°

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

PAR index

Answer

DAI index

Answer

ICON index

Question 5

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

Accepted Answer

Mixed dentition stage

Answer

Primary dentition stage

Answer

Early permanent dentition stage

Answer

Late permanent dentition stage

Question 6

A Class III skeletal relationship is best described by which cephalometric finding?

Accepted Answer

ANB angle of 0° or less

Answer

ANB angle greater than 4°

Answer

ANB angle of 2–4°

Answer

SNA angle greater than 85°

Question 7

What does the Bolton analysis assess in orthodontic treatment planning?

Accepted Answer

Tooth size discrepancy between the upper and lower dental arches

Answer

Available arch length versus total tooth width

Answer

Discrepancy between the overall size of the maxilla and mandible

Answer

The skeletal classification of the patient