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BDS3 Orthodontic Lab Techniques > URA design > Flashcards

URA design Flashcards

1
Q

What does I.O.T.N mean?

A
  • Index of orthodontic treatment need
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2
Q

What is the I.O.T.N?

A
  • Rank malocclusion in terms of significance of various occlusal traits for individuals health and perceived aesthetic impairment
  • Identify who would benefit most from ortho treatment
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3
Q

What are the two components of I.O.T.N?

A
  • Aesthetic component (AC)
  • Dental health component (DHC)
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4
Q

What are the different types of orthodontics available?

A
  • Fixed ortho
  • Conventional removable retainers
  • Thermoplastic retainers
  • Bonded retainers
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5
Q

What is the aim for URA design?

A
  • Description of what the appliance design is aiming to achieve
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6
Q

What is the anagram of URA design?

A

A - Active component
R- Retentive
A - Anchorage
B - Base plate

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7
Q

What is the definition of Active component?

A
  • The name of the component or components that will be moving teeth with the application of force
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8
Q

What is the definition of Retentive?

A
  • The resistance to displacement forces
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9
Q

What is the definition of Anchorage?

A
  • The resistance to unwanted tooth movement
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10
Q

What is the definition of Baseplate?

A
  • Connects all the components together as a unit, provides anchorage & assists with retention
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11
Q

How do teeth move?

A
  • Orthodontics based on principle if prolonged force applied to tooth, tooth movement will occur
  • Force exerted created pressure
  • Causes bone around tooth to remodel
  • Remodelling controlled by PDL
  • Via osteoclasts and osteoblasts
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12
Q

What is the constituents of stainless steel?

A

72% - Iron
18% - Chromium
8% - Nickel
1.7% - Titanium
0.3% - Carbon

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13
Q

What are the advantages of removable orthodontics?

A
  • Tipping of teeth
  • Excellent Anchorage
  • Generally cheaper than fixed
  • Shorter chairside time required
  • Oral hygiene is easier to maintain
  • Non- destructive to tooth surface
  • Less specialised training required to manage
  • Can be easily adapted for overbite reduction
  • Can achieve block movements
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14
Q

What are the disadvantages of removable orthodontics?

A
  • Less precise control of tooth movement
  • Can be easily removed by the patient
  • Generally only 1-2 teeth can be moved at one time
  • Specialist technical staff required to construct the appliances
  • Rotations very difficult to correct
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15
Q

When fitting a URA what are the steps you follow?

A
  • Right appliance, right patient
  • Check it matches design
  • Inspect and run finger over all surfaces for sharp or potentially traumatic areas
  • Check integrity of wirework
  • Insert into mouth and check for blanching or soft tissue trauma
  • Check posterior retention (are clasps engaging undercuts)
  • Check anterior retention
  • Activate appliance (1mm movement per month)
  • Demonstrate correct insertion and removal and ensure patient does this
  • Book review appointment for 4-6 weeks
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16
Q

What is the patient info and instructions after URA?

A
  • Appliance will feel big and bulky (this is normal and they will get used to it)
  • May cause initial excessive salivation (pass within 24hrs)
  • May impinge speech for short period of time (practise reading a book aloud at home and it will subside)
  • May cause initial discomfort or ache (normal and indicates appliance is working)
  • To be worn 24/7 inc meal and sleep
  • Remove after every meal and clean with soft brush
  • Remove and store in protective container during active or contact sports
  • Avoid hard or stick foods that may damage appliance
  • Be cautious with hot or drinks
  • Missing appointments and non-compliance will significantly lengthen treatment time
  • Provide emergency contact details in case any problem arise
17
Q

What are the design appliances for Retract canines, 1st Premolars extracted, 6mm Overjet (OJ) + Reduce Overbite (OB)

A

Aim = Construct URA to retract 13+23 + reduce overbite
A = 13 + 23, Palatal finger springs + guards, 0.5mm HSSW
R = 16 + 26, Adams clasps, 0.7mm HSSW
11 + 21, Southend clasp, 0.7mm HSSW
A = Moving only 2 teeth
B = Self cure PMMA
Flat anterior Bite plane (FABP), OJ +3mm

18
Q

Why do we add 3mm to whatever the overjet is when doing a FABP?

A
  • If did not add 3 mm
  • Lower anterior would retrocline
  • Overjet would not be reduced
19
Q

After we have reduced the overbite what can we do next?

A
  • Make a whole new URA to tip the front teeth back to reduce the overjet
20
Q

What are some retentive components and their gauges of wire?

A

Adams clasp = 0.7mm HSSW
Southend clasp = 0.7mm HSSW
Labial bows = 0.7mm HSSW

21
Q

What are some palatally placed active components?

A

Finger springs + guard = 0.5mm HSSW
Z-spring = 0.5mm HSSW
Flapper spring = 0.5mm HSSW
T-spring = 0.5mm HSSW

22
Q

What are some buccally placed active components and their gauges of wire?

A

Buccal canine retractor = 0.5mm HSSW (sheathed with 0.5mm internal diameter tubing)
Roberts retractor = 0.5mm HSSW (sheathed with 0.5mm internal diameter tubing)

23
Q

What is the passive component and it’s gauge of wire in URA design?

A

Stops = 0.7mm hard stainless steel (flattened)

24
Q

What would the appliance design be for Buccally placed canines, 1st Premolars extracted, 6mm (OJ) + Reduce (OB)

A

Aim = Pls construct URA to retract buccally placed canines and reduce OB
A = 13+23, buccal canine retractors 0.5mm HSSW + 0.5mm I.D tubing
R = 16 + 26 Adams clasp 0.7mm HSSW
11 + 21 Southend clasp 0.7mm HSSW
A = Moving only 2 teeth
B = Self cure PMMA
FABP, OJ + 3mm

25
Q

What is the appliance design for URA to correct 12 anterior crossbite?

A

Aim - Pls construct URA to correct 12 anterior crossbite
A = 12 Z-finger spring 0.5mm HSSW
R = 16 + 26 Adams clasp 0.7mm HSSW
14 + 24 Adams clasp 0.7mm HSSW
A = Moving only 1 tooth
B = Self cure PMMA
Posterior bite plane (PBP)

26
Q

Why do use a posterior bite plane when correcting anterior crossbite?

A
  • To ensure posterior teeth don’t continue to erupt
  • If they did this would cause overbite
27
Q

What are some different uses of casts in orthodontics?

A
  • Motivation for patient
  • Design appliances
  • Form of record
  • Teaching
  • Able to see changes in occlusion
  • Pt explanation

BDS3 Orthodontic Lab Techniques (1 decks)

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