Orthodontic Assessment

Question 1

benefits of ortho tx

Answer 1

improved aesthetics
improved dental health (teeth easier to clean)
reduces risk of trauma
facilitates other areas of tx

Question 2

risks of ortho tx

Answer 2

decalcification
relapse
root resorption
pain / discomfort
soft tissue trauma
candida infection
loss of tooth vitality

Question 3

andrews 6 keys to an ideal occlusion

Answer 3

1. class I molar relationship
2. crown angulation (mesio-distal tip)
3. crown inclination
4. no rotations
5. no spaces
6. flat occlusal plane

Question 4

biting finger nails can cause

Answer 4

resorption of upper centrals

Question 5

3 planes skeletal pattern

Answer 5

antero posterior
vertical
transverse

Question 6

how to assess AP skeletal base clinically

Answer 6

visual assessment
palpate skeletal bases

Question 7

class I skeletal base

Answer 7

maxilla 2-3mm in front of mandible

Question 8

class II skeletal base

Answer 8

maxilla more than 3mm in front of mandible

Question 9

class III skeletal base

Answer 9

mandible in front of maxilla

Question 10

vertical skeletal assessment

Answer 10

FMPA - frankfort mandibular planes angle
frankfort plane measured against lower border of mandible (mandibular plane)

Question 11

lateral skeletal assessment

Answer 11

mid sagittal reference line

Question 12

competent lips

Answer 12

lips that meet at rest
relaxed mentalis muscle

Question 13

incompetent lips

Answer 13

lips that do not meet
relaxed mentalis muscle

Question 14

lip trap

Answer 14

may procline upper incisors
may lead to relapse of OJ if persists at end of tx
indicator of end of tx instability
quite often in class II
upper teeth rest on lower lip

Question 15

hyperactive lower lip

Answer 15

may retrocline lower incisors
indicates end of tx instability

Question 16

tongue thrust

Answer 16

can either cause an AOB or be the effect of an AOB
indicates end of tx instability

Question 17

occlusal features of a digit sucking habit

Answer 17

proclination of upper anteriors
retroclination of lower anteriors
localised AOB or incomplete OB
narrow upper arch +/- unilateral posterior crossbite

note - effects will be superimposed on existing skeletal pattern and incisor relationship

Question 18

what to look for in lower arch

Answer 18

degree of crowding - uncrowded, mild, moderate, severe
presence of rotations
inclination of canines - mesial, upright, distal
angulation of incisors to mandibular plane - upright, proclined, retroclined

Question 19

what to look for in upper arch

Answer 19

degree of crowding - uncrowded, mild, moderate, severe
presence of rotations
inclination of canines - mesial, upright, distal
angulation of incisors to frankfort plane - upright, proclined, retroclined

Question 20

angulation of long axis of upper incisors to frankfort plane

Answer 20

110o

Question 21

BSI incisor classification

Answer 21

class I - lower incisor edges occlude with or lie immediately below cingulum plateau of upper centrals
class II - lower incisor edges lie posterior to the cingulum plateau of upper incisors
- div 1 = upper incisors are proclined or of average inclination and there is an increase in overjet
- div 2 = upper centrals are retroclined and the overjet is usually minimal or increased
class III - lower edges lie anterior to cingulum plateau of the upper incisors and the overjet is reduced or reversed