Interceptive Orthodontics 2

Question 1

what should you assess when a patient presents with an anterior cross bite

Answer 1

displacement
mobility of lower incisor
tooth wear
gingival recession

Question 2

what is the acronym used when designing an ortho appliance

Answer 2

ARAB

Question 3

what active component could be used to correct and anterior crossbite

Answer 3

Z-spring

Question 4

what does stability of a cross bite correction long term depend on

Answer 4

overbite
growth

Question 5

why is it less likely for an anterior crossbite to relapse than a posterior

Answer 5

if the anterior cross bite is in a slight overbite, the lower centrals prevent the teeth from tipping back

Question 6

what is the difference in teeth appearance from a thumb vs dummy habit

Answer 6

thumb gives a more asymmetrical anterior open bite
dummies can be thrown out - no need for as much management

Question 7

why do you want to treat a digit sucking habit early

Answer 7

so there is potential for spontaneous correction of anterior open bite
prevent effects on transverse and vertical skeletal elements

Question 8

what are four aspects of digit habit management

Answer 8

positive reinforcement
bitter-tasking nail varnish
glove on hand
habit breaker appliance

Question 9

what is the aspect of appliance design that is a deterrent to digit sucking

Answer 9

goal post - wire on the palatal aspect

Question 10

what are effects of digit habits on teeth

Answer 10

anterior OB
proclines upper incisors
retroclines lower incisors
narrows upper arch - posterior crossbite

Question 11

what should you be looking for in the late mixed dentition stage

Answer 11

infra-occluding teeth
canines
overjets

Question 12

what is the aetiology of an infra-occluded tooth

Answer 12

primary tooth ankyloses to the bone and surrounding alveolar bone continues to grow

Question 13

what might be an indication when an infra-occluded tooth is present

Answer 13

there is not a permanent successor

Question 14

how would you treat an infra-occluded tooth with a permanent successor present

Answer 14

monitor for up to a year
extract if tooth is below the interproximal contact point
consider extraction if root formation of successor near complete

Question 15

how would you treat an infra-occluded tooth if there is no permanent successor

Answer 15

treatment plan depends on degree of crowding, degree of infra-occlusion
retain primary if in good condition and consider onlay
extract if below contact point

Question 16

how do you assess canines before they erupt

Answer 16

radiograph - OPT and upper occlusal
palpate buccal mucosa

Question 17

what would the interceptive treatment if primary canines have not shed but the permanent canines are present

Answer 17

extraction of primaries

Question 18

what can occur with an impacted permanent canine

Answer 18

root resorption of lateral incisors - as the canine lies distal to the position of the lateral incisor root

Question 19

when is there a very high chance that extracting the primary canine will allow permanent canine to move into place

Answer 19

if permanent canine has not crossed the middle of the lateral incisor root

Question 20

what should be considered after extraction of primary teeth

Answer 20

space maintainers

Question 21

what are risks of ectopic maxillary canines

Answer 21

permanent canine fails to erupt
root resorption of adjacent teeth

Question 22

what class of occlusion would a reverse overjet be associated with

Answer 22

class III

Question 23

what would you look for when assessing a patient with a reverse overjet

Answer 23

they can get edge to edge relationship

Question 24

what limits treatment of reverse overjets

Answer 24

upper incisors proclined more than 120 degrees already

Question 25

what would the plan be if the patient has an underlying skeletal problem causing the reverse overjet

Answer 25

wait until growth has stopped

Question 26

what is interceptive treatment for class III malocclusion

Answer 26

enhance maxillary growth and reduce mandible growth
protraction headgear and RME
functional appliances - twin block

Question 27

what are the indications for growth modification in class III

Answer 27

mild class III
maxillary retrusion
anterior displacement in closing
average or reduced lower face height
patient age 8-10

Question 28

what are risks of increased OJ

Answer 28

risk of trauma
incompetent lips
appearance - bullying

Question 29

what IOTN scores would mean treatment for overjets

Answer 29

4 - more than 6mm
5 - more than 9mm

Question 30

what are the IOTN scores

Answer 30

3 - borderline
4 - need for treatment
5 - high need for treatment

Question 31

what is the aim of interceptive treatment for class II malocclusion

Answer 31

restrain maxillary growth and promote mandibular growth