Ortho Assessment

Question 1

What are the 3 methods to measure skeletal bases

Answer 1

AP
Vertical
Tranverse

Question 2

How do we assess the skeletal pattern

Answer 2

AP
2 fingers
Class I - maxilla 2-3mm in front of mandible
Class II - maxilla >2-3mm in front of mandible
Class III - mandible in front of maxilla

Vertical
FMPA
Increased if lines meet before back of head
Decreased if lines don’t meet at back of head

Transverse
Asymmetry

Question 3

Soft tissue assessment (4)

Answer 3

Smile line
Nasolabial angle
Lip trap

Question 4

What do we assess I/O

Answer 4

Teeth quality/quantity/caries
Incisor relationship - proclined/retroclined
Canine relationship
Molar relationship
Xbites
Crowding
<4
4-8
>8
Centrelines
OB/OJ

Question 5

Define incisor class I

Answer 5

Lower incisors occlude with cingulum plateau of uppers

Question 6

Define incisor class II

Answer 6

Lower incisors lie posterior o cingulum plateau of uppers

Question 7

Define incisor class II div I

Answer 7

Lower incisors lie posterior to cingulum plateau of uppers
Uppers proclined
Increased OJ

Question 8

Define incisor class II Div II

Answer 8

Lower incisors lie posterior to cingulum plateau of uppers
Uppers retroclined
OJ inc or dec

Question 9

Define incisor class III

Answer 9

Lower incisors lie anterior to cingulum plateau of uppers
OJ reduced or reversed

Question 10

Define canine class I

Answer 10

Upper canine lies posterior to lower canine

Question 11

Define canine class II

Answer 11

Upper canine lies anterior to lower canine

Question 12

Define canine class III

Answer 12

Upper canine v posterior to lower

Question 13

Define molar class I

Answer 13

MB cusp of U6 lies in buccal groove of L6

Question 14

Define molar class II

Answer 14

MB cusp of U6 lies anterior to buccal groove of L6

Question 15

Define molar class III

Answer 15

MB cusp of U6 lies posterior to buccal groove of L6

Question 16

Lists risks associated with ortho tx

Answer 16

1. Relapse
2. Decalcification
3. Resorption
4. Recession
5. Gingivitis
6. Enamel wear
7. Loss of vitality

Question 17

Patient friendly description of relapse

Answer 17

When teeth go back to the same place after tx / squint
Can be inevitable
But large degree determined by your compliance post op
- Retainers

Question 18

Patient friendly description of resorption

Answer 18

When roots of teeth shorten after tx
About 1mm in normal in 2yrs some is inevitable due to forces on tooth to move it, however if it becomes excessive might need to intervene/stop tx and require further tx

Question 19

Patient friendly description of decalcification

Answer 19

Early decay - white spots on the teeth
Caused by poor oH
Brackets make it harder ot maintain oH therefore really need to focus on keeping it good, OH, Brushing, MW, TP brushes
White spots = early decay
Want to make sure we dont have them permanently/ develop into decay

Question 20

Patient friendly description of recession

Answer 20

This is when the gums shrink back
Can see more root than usually
Aesthetic issue
Can increase sensitivity + caries risk as the root surface is less mineralised easier to

Question 21

List benefits of ortho tx

Answer 21

Aesthetics
Function - mastication/speech
Psychological benefit
Dental health - crowding –> caries

Question 22

List the risks for root resorption

Answer 22

• Type of movement
• Prev trauma
• Nail biting

Question 23

List the ortho issues that inc risk of relapse

Answer 23

Diastema
Instancing U2s
AOB
Rotations

Question 24

When is a Hawley retainer used?

Answer 24

Significant OJ to minimise relapse

Question 25

Compare fixed + removable retainers

Answer 25

Removable Retainers
- Thermoplastic
- Worn/brittle/fracture
- Compliance dependent
- Require replacements

Fixed
- Fixed wire
- Require excellent OH
- Debond caries risk under/ST trauma