ortho

Question 1

name 3 examples of active components and what they are used for

Answer 1

finger spring - mesial or distal movements
buccal canine retractors - move canines palatally
z spring - push labially

Question 2

what are the 5 displacement forces

Answer 2

tongue, mastication, speech, gravity, active components

Question 3

where should base plate be extended back to

Answer 3

mid point of 7s then curved to avoid soft palate

Question 4

discuss the pros and cons of URA’s

Answer 4

pros: excellent anchorage, cheaper than fixed, less time chairside, better hygiene, no destruction to tooth surface
cons: relies on patient compliance, less precise control of tooth movement, can only move 1-2 teeth at a time

Question 5

10 steps to fitting a URA

Answer 5

1 - ensure appliance details match patient
2 - check appliance matches the design
3 - inspect appliance and run finger over to check for sharp edges
4 - check wire work integrity
5 - insert into mouth and look for areas of blanching or soft tissue trauma
6 - check posterior retention (adam’s clasps)
7 - check anterior retention
8 - activate appliance
9 - show patient how to insert and remove
10 - book review appt in 4-6 weeks

Question 6

10 instructions to tell pt about URA

Answer 6

1 - will feel big and bulky initially , this is normal and will pass
2 - may cause initial excess saliva but this will pass within first 24 hours
3 - may impinge on speak , practice reading a book out loud to help this subside
4 - may experience discomfort/ ache - this shows appliance is working
5 - should be worn 24/7 including sleeping and eating
6 - remove after every meal and clean with a soft brush
7 - remove and safely store in a container during contact sports
8 - avoid hard and sticky foods that may damage appliance and be cautious with hot foods and drinks as roof of mouth is covered - may burn
9 - missing appointments or not wearing appliance will significantly lengthen treatment
10 - provide emergency contact details

Question 7

steps to create an adam’s clasp

Answer 7

1 - straighten wire
2 - create 90 degrees bends measured to size of tooth
3 - make arrow heads, as small as possible
4 - position arrowheads at 45 degrees to bridge, using pliers across arrowheads
5 - using cast to orientate, push wire until perpendicular to bridge, will take 2 movements
6 - place plier tips as close to arrow head as possible and bend the wire till it goes between the teeth
7 - leave a straight portion going interprox, then mark where bend towards palate should begin
8 - bend towards palate
9 - create tag
10 - repeat on other side

Question 8

what pliers for an adams clasp

Answer 8

number 64

Question 9

number 64 vs number 65 pliers

Answer 9

64 - 2 square ends
65 - one square end, one cone

Question 10

what 2 active components also require 0.5mm internal diameter tubing and why

Answer 10

buccal canine retractors
roberts retractors
used to prevent distortion

Question 11

what active component also requires mesial stops and what diameter wire should be used

Answer 11

roberts retractor
0.7mm HSSW

Question 12

what two active components would you use to correct an anterior crossbite

Answer 12

posterior bite plane - prop open anterior bite
z spring