tx class 1 malocclusipns

Question 1

class I incisor relationship

Answer 1

Lower incisor occludes at or below the upper incisor cingulum plateau

• cingulum in the middle of the upper incisor
• normal overbite of about a 1/3 of the lower incisor

Question 2

problems with a class I

Answer 2

We can still get

• crowding
• spacing
• displaced teeth

Question 3

aetiology of crowding

Answer 3

imbalance with
jaw size
tooth size
arch perimeter

Question 4

treatment of crowdign

Answer 4

expansion
distal movemnt
enamel stripping
extraction

Question 5

problems with expansion

Answer 5

relapse
fenestration of laibal plate(tooth no longer in the gum, problems with mobility)
aesthetics

Question 6

expansion with removeable appliance measurements

Answer 6

avg expansion 3.7mm, avg relapse is 2mm

Question 7

appliances for expansoon

Answer 7

quad helix - may develop diastema
Damon system (arch wire)

Question 8

what causes an open bite during expansion

Answer 8

canine being brought down, causes incisors to retrude upwards

Question 9

how can distal movement be created in upper arch

Answer 9

headgear
temp anchorage devices, mid palatal implants
non compliance appliances (eg pendulum appliance)

Question 10

types of spacing

Answer 10

upper midline diastema
generalised spacing
missing teeth

Question 11

with missing teeth what does opening/closing space depend on

Answer 11

malocclusion
molar relationship
space presetn

Question 12

molar rx affecting open/closing space

Answer 12

Class I molars – tend to open up the space
- can replace the space made with bridges/pontics ect
Class II molars
- tend to close the space
- we have to accept we may still have class II molars on one side

Question 13

incisor malocclusion with missing upper lateral incisors generally.. (treat with and what occlusion)

Answer 13

class II incisors close space
class III open space

Question 14

tx of palatally impacted mx canines

Answer 14

leave in situ and monitor
extract
expose and align
transplant

Question 15

tx of bucally impacted mx canines

Answer 15

close exposure (attach gold chain)
open exposure (apically repositioned flap)

Question 16

class I summary tx for crowding, spacing, displaced teeth

Answer 16

crowding
- expansion, distal movement, enamel stripping, extraction
spacing
- missing teeth open or close space
displace teeth
- leave extract, expose and alignment, transplant