MJDF Part 1 - Membership of Joint Dental Faculties Orthodontic Assessment and Referral Questions and Answers

Question 1

An 8-year-old child presents with a unilateral posterior crossbite affecting the maxillary right first permanent molar.
On closure, you observe a clear mandibular displacement to the right into maximum intercuspation.
According to UK guidelines, what is the most appropriate management plan?

Accepted Answer

Refer for an orthodontic opinion regarding early interceptive treatment.

Answer

Review the patient in 12 months to see if the crossbite self-corrects.

Answer

Advise the patient to perform exercises to strengthen the contralateral masticatory muscles.

Answer

Extract the opposing primary molar to eliminate the occlusal interference.

Question 2

A 10-year-old patient attends for a routine examination. You are unable to palpate the maxillary permanent canines in the buccal sulcus, and you note that the maxillary lateral incisors appear slightly proclined. What is the most appropriate immediate action?

Accepted Answer

Refer the patient for an orthodontic opinion and further radiographic investigation.

Answer

Take a periapical radiograph of the primary canines.

Answer

Advise the patient that this is a normal stage of development and review in one year.

Answer

Extract the primary canines to encourage eruption of the permanent successors.

Question 3

When using the Index of Orthodontic Treatment Need (IOTN) for NHS funding eligibility, the Aesthetic Component (AC) is used as a qualifier for patients with a Dental Health Component (DHC) of 3. Which AC score range indicates a sufficient aesthetic need to qualify for treatment?

Accepted Answer

AC score of 6 or greater

Answer

AC score of 1-4

Answer

AC score of 8-10

Answer

AC score of 5 or greater

Question 4

A 13-year-old patient presents with congenitally absent maxillary lateral incisors (hypodontia). The primary lateral incisors are still in place. According to the IOTN Dental Health Component (DHC), which grade would this patient most likely be assigned, assuming orthodontic treatment is required?

Accepted Answer

4h

Answer

3h

Answer

5i

Answer

2h

Question 5

Which of the following clinical features is most characteristic of a true Skeletal Class III malocclusion?

Accepted Answer

A concave facial profile and a Class III incisor relationship.

Answer

A convex facial profile with a recessive chin.

Answer

A reverse overjet that eliminates upon guiding the mandible into centric relation.

Answer

Competent lips at rest and a Class I molar relationship.

Question 6

A 12-year-old patient has a reverse overjet of 2.5mm. The patient and parent report difficulties with speech and mastication related to the anterior crossbite. According to the IOTN Dental Health Component (DHC), what is the correct grade?

Accepted Answer

4m

Answer

3b

Answer

5m

Answer

4b