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BDS3 - Orthodontics > ortho 4 zoom notes > Flashcards

ortho 4 zoom notes Flashcards

1
Q

what is used to bring buccally placed canines back into position

A
  • buccal canine retractor
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2
Q

why d you use a buccal canine retractor instead of a palatal finger spring for buccally placed canine

A
  • finger palatal spring would only pull back and not into line
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3
Q

why is there tubing on a buccal canine retractor

A
  • make it more rigid as otherwise it can be easily distorted
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4
Q

why do you only move the canines initially and not also fix the overjet as well

A
  • moving anymore than just the canines would affect the anchorage
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5
Q

when are flat anterior bite planes used

A
  • only ever used on the correction of overbites
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6
Q

why must you add the extra 3mm onto the FABP

A
  • don’t want lower teeth getting trapped behind the bite plane
  • adding on 3 stops them getting trapped
  • prevents lower incisors becoming retroinclined
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7
Q

what is the dimensions of the FABP

A
  • size of OJ + 3mm
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8
Q

why do lowers come up to meet uppers rather than uppers moving down

A
  • uppers can’t move down as they are held in place by the appliance
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9
Q

what does the FABP do

A
  • opens up space between the posterior teeth to allow the lowers to move up to meet uppers
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10
Q

how do Adam’s claps work

A
  • applies the principles of either using or blocking undercuts
  • part engages the undercut and this is how we get retention
  • comes interdentally between the 5 and 6, and the 6 and 7
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11
Q

what does the bridge of the Adam’s clasp do

A
  • keeps the buccal aspect away
  • keeps cheek away
  • gives patient area to go in and remove appliance
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12
Q

which part of Adam’s claps engage undercut

A
  • arrowhead
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13
Q

which part of the Adam’s claps goes interdentally

A
  • flyover
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14
Q

what is the leg of the Adam’s clasp

A
  • goes down into palatal region
  • needs to be gap between the leg and the palate to allow for the acrylic
  • needs to be a gap of about 1mm between wire work and palate to allow for space for baseplate
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15
Q

what is the tag of the Adam’s clas

A
  • gives some mechanical retention to stop component sliding out of acrylic
  • because SS is so smooth, need to put this on to lock/grip it in place to stop it getting pulled out acrylic
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16
Q

which part of the Adam’s clasp needs adjusted first

A
  • adjust flyover first before the arrowhead

- if did arrowhead first, then it would move again anyway when you try to adjust the flyover

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17
Q

what happens if the flyover is in the wrong position

A
  • prop occlusion open
  • metal fatigue = from biting on it until it reaches a point where it can fracture
  • gum stripper = makes arrowhead irritate the gingiva
  • can change shape of wire = can become non-functional
18
Q

why do we fix the flyover before the arrowhead

A
  • if fix arrowhead first, can then move again once fix flyover
19
Q

what is the aim of the palatal finger spring

A
  • move a tooth straight back
20
Q

what does the coil of a palatal finger spring do

A
  • where the force is exerted from
21
Q

how does the coil of a palatal finger spring work

A
  • works by uncoiling = this is how it moves the tooth
  • wind wires up in coil
  • want it to uncoil over a period of time which moves the tooth
22
Q

what does the active arm of the palatal finger sprig do

A
  • way in which the force is applied
  • comes halfway around the canine
  • only point where it applies the force is the corner of the canine tooth
23
Q

why is the active arm of the palatal finger spring wrapped round the canine

A
  • if only goes to the corner (where force is exerted), tooth could start to rotate because force coming from an angle
  • so, we hug tooth with active arm to keep it going in correct orientation
24
Q

what does the guard wire of the palatal finger spring do

A
  • palatal spring will slide along the guard without interfering the palate
  • allows active arm to move without traumatising soft tissue or being impinged by it
25
Q

how do we activate the finger palatal spring

A
  • once a month need to activate it again to make it work again
  • adjust the coil
  • make sure active arm is tight around canine = as it moves away from tooth over the course of the month
26
Q

why does the active arm come away from the canine during the month

A
  • as tooth moves back the distance from the coil to the corner of the tooth is a lot further than whenever the tooth has moved back
  • as the wire uncoils it gets longer = it uncoils when it is activated so gets longer
27
Q

what are the stages of fitting a URA

A
  • ensure patient details match details supplied for appliance
  • check appliance matches design specifications
  • inspect appliance and run your finger over it to check for any rough edges
  • check integrity of wirework (no work hardening)
  • insert appliance in patients mouth and check for areas of trauma
  • check posterior retention = first flyovers of Adam’s clasp then arrowhead
  • check anterior retention
  • activate the appliance
  • demonstrate to patient correct procedure for insertion and removal
  • book review appointment
28
Q

how much tooth movement should here be a month

A
  • about 1mm
29
Q

what is a Roberts retractor

A
  • looks like a buccal canine retractor but is joined in the middle
  • tubing comes distal to canines with coil for activation
  • used for overjet
30
Q

how do we stop the canines from relapsing when trying to move the anterior teeth back

A
  • use stops
  • don’t fall under ARAB
  • flattened so little thinner
  • lie passively to mesial aspect of canines
  • don’t apply force, just simply passive to prevent canines going forward
31
Q

how is the anchorage when moving anterior teeth to fix OJ

A
  • not ideal as we are moving 4 teeth but is ok
  • we get away with it because they are the shortest rooted teeth in the upper
  • not brilliant but keep and eye on it
32
Q

what is the problem if we use Roberts retractor

A
  • can’t put south end clasp on for retention anteriorly
33
Q

what is ideal about the Roberts retractor

A
  • because the wire work is halfway up into undercut area of Robert’s retractor can offer some retention
  • but it is an active component and just by luck it offers some retention too
34
Q

what is the problem with FABP

A
  • it is in the way of the upper anterior teeth tilting back

- impossible for upper teeth to move back when there is acrylic jammed behind it

35
Q

how can you counteract problem of FABP preventing anterior teeth moving back

A

0- need to trim a bit off the FABP at chair side each month

  • need to trim it at an angle = chamfer it
  • allows for movement for the tooth to come back
36
Q

why can’t we use a posterior bite plane instead of FABP to fix a OJ

A
  • it would prop open the bite

- works to bring them back until it is removed then will relapse

37
Q

what do you need to inform patient about when giving them URA

A
  • appliance will feel big and bulky
  • may cause excessive salivation
  • may impinge speech for a short period of time
  • may cause initial discomfort
  • need to be warn 24/7
  • remove after every meal and clean
  • don’t wear during contact or active sports
  • avoid hard/sticky foods and cautious with hot food or drinks
  • missing appointments and non-compliance will significantly lengthen treatment time
  • provide emergency contact details
38
Q

if having to use Adam’s clasp on deciduous teeth what gauge of wire is used

A
  • 0.6mm instead of 0.7mm
39
Q

what is good about z-springs

A
  • they can allow a little bit of rotational movement, instead of just tipping and tilting
40
Q

how does Z-springs work

A
  • if want to move tooth straight forward activate both coils

- if want to include some rotational movement activate only one coil = movement in opposite direction of coil activated

BDS3 - Orthodontics (14 decks)

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