Patient Assessment

Question 1

What are the measurements for crowding severity?

Answer 1

Mild = 2-4mm
Moderate = 4-8mm
Severe = 8+ mm

Question 2

What is a skeletal class I?

Answer 2

The mandible is posterior to the maxilla by 2-3mm

Question 3

What is a skeletal class II?

Answer 3

The mandible is retruded relative to the maxilla

Question 4

What is a skeletal class III?

Answer 4

The mandible is protruded relative to the maxilla

Question 5

What is a class I incisor relationship?

Answer 5

The lower incisal edge occludes on or just below the cingulum plateau of the upper incisors

Question 6

What is a class II division 1 incisor relationship?

Answer 6

The incisal edge of the lower incisors occludes posterior to the cingulum plateau of the upper incisors- the upper incisors are proclined or of normal inclination

Question 7

What is a class II division 2 incisor relationship?

Answer 7

The incisal edge of the lower incisors occludes posterior to the cingulum plateau of the upper incisors- the upper incisors are retroclined

Question 8

What is a class III incisor relationship?

Answer 8

The incisal edge of the lower incisors occludes anterior to the cingulum plateau of the upper incisors

Question 9

What is the kettles method?

Answer 9

The use of the middle finger and forefinger to palate the skeletal bases of the A&B points. 
The patients head must be in natural head position
• if the wrist goes up the patient is class III 
• if the wrist goes down the patient is class II

Question 10

How does a patient get into natural head position?

Answer 10

Look at their own eyes in a mirror or look at a point in the distance

Question 11

What are Andrew’s 6 keys?

Answer 11

1. Correct molar relationship
2. Correct crown angulation
3. Correct crown inclination
4. Flat curve of spee
5. No rotations
6. No spaces

7th added - correct tooth size

Question 12

What are the 3 planes of space?

Answer 12

• antero posterior = front to back
• vertical = up and down
• transverse = horizontal

Question 13

What is a scissor bite?

Answer 13

One or more buccal segment teeth occlude entirely buccal to the lower arch teeth

Question 14

When undertaking an orthodontic assessment what does the Frankfort Mandibular Planes Angle help us to assess?

Answer 14

The vertical dimensions

Question 15

Why are study models gnatho statically trimmed?

Answer 15

To observe the occlusion without the aid of an articulator

Question 16

What is the importance of lip competence?

Answer 16

• lower lip acts as a retainer - maintaining position of upper incisors and minimising the overjet
• creates an anterior oral seal during swallowing
• minimises mouth breathing

Question 17

What is dento alveolar compensation?

Answer 17

When teeth compensate for the skeletal pattern discrepancy to aim for class I incisor relationship

Question 18

What are examples of dento alveolar compensation?

Answer 18

• class II - retroclined upper incisors, proclined lower incisors
• class III - proclined upper incisors, retroclined lower incisors

Question 19

What is the difference between competent and incompetent lips?

Answer 19

Competent = when lips are at rest they come together easily and form an oral seal

Incompetent = when lips are at rest they do not meet

Question 20

What is a model called when it has had teeth moved in it and placed on with wax?

Answer 20

Keeping set up