Treatment planning

Question 1

name 3 possible causes of malocclusion

Answer 1

skeletal discrepancies, digit sucking, early loss of deciduous teeth, small teeth (spacing)

Question 2

what are the 3 broad objectives of orthodontic treatment

Answer 2

to create an occlusion with is stable , functional and aesthetic

Question 3

Name 5 potential variables orthodontic treatment planning needs to consider

Answer 3

• prognosis of individual teeth
• patient compliance
• patient wishes
• aetiology of malocclusion
• future growth changes
• access to treatment
• soft tissue profile

Question 4

Comprehensive orthodontic treatment

Answer 4

aims for full correction of malocclusion
works to class I canine relationship, class I incisor relationship and Andrews 6 keys;
- molar relationship (mesial upper 6 cusp in groove of lower 6)
- no rotation
- no spaces
- flat occlusal plane
- correct angulation
- correct inclination

Question 5

why should treatment be planned around the lower arch rather than the upper

Answer 5

angulation of lower arch is stable to prone to relapse if altered greatly
if extracting in lower must compensatory extract in the upper

Question 6

what are the two methods of measuring the extent of crowding

Answer 6

• measure space available and compare to space required
  (measure arch space compared with space required for all teeth)
• overlap technique (add all overlaps to see space discrepancy)

Question 7

what is classed as mild crowding and how should it be managed (lower arch)

Answer 7

0-4mm
stripping technique (removal of some enamel interproximally to create space)
OR
extraction of 5s

Question 8

why does the extraction of lower 5s yield less room than extraction of lower 4s

Answer 8

due to fast mesial drift of the 6

Question 9

what is classed as moderate crowding and how is it managed

Answer 9

4-8mm
extract 5s or 4s depending on how much room required

Question 10

what is classed as severe crowding and how is it managed

Answer 10

8mm +
extraction of 4s