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Orthodontics > Material > Flashcards

Material Flashcards

1
Q

Archwires

A
  • Stainless steel
  • Cobalt chromium
  • Nickel titanium (Niti)
  • TMA - Titanium Molybdenum Alloy (beta titanium)
  • Aesthetic
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2
Q

Nickel titanium (Types of Niti)

A
  • Classic
  • Superelastic
  • Heat activated
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3
Q

Initial Aligning wires properties?

A
  • Low stiffness
  • Low friction
  • large Range
  • light continuous force
  • Non toxic
  • low cost
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4
Q

Initial alignment wire options?

A
  • Superelastic Niti - 0.012” to 0.014”
  • Heat activated Niti - 0.016” to 0.020 “
  • 0.010” single strand SS
  • 0.015” - 0.018” Multi strand SS
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5
Q

Nickel Titanium 3 choices

A
  • Martensitic stable - Classic e.g. Nitinol
  • Austenitic active - Superelastic or pseudo elastic.
  • Martensitic active - Heat or thermally activated.
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6
Q

Properties of Niti ?

A
  • Good range
  • No elasticity
  • high friction
  • low stifness
  • poor bio host
  • bio compatible
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7
Q

Properties of Stainless steel?

A
  • large elasticity
  • high stifness
  • corrosion resistance
  • low friction
  • good for space closure because of Low friction
  • bio host
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8
Q

Properties of TMA? Or beta- titanium ?

A
  • Elasticity less than SS but twice that of nitinol
  • Higher firction than ss
  • high cost
  • formability good
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9
Q

Aesthetic wires

A
  • Coated wires - White epoxy resin e.g Teflon
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10
Q

What wire sequence should we use?

A
  • Initial alignment - Light and limited
  • Levelling - heavier and limited
  • Space closure - Stiff & low friction
  • Finishing - Formable
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11
Q

Define friction

A
  • A force resist relative motion of two objects in contact.
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12
Q

Law of friction

A

Friction = Force x coefficient of friction

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13
Q

Types of friction

A
  • Static friction - Small amount of force required to initiate sliding between objects
  • Kinetic friction - Amount of force resisting sliding once moving.

Important : Static friction more important as teeth do not slide but Walk along arch wire with small tippping and uprighting movements.

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14
Q

Bracket material - Friction

A
  • Ceramic > friction than metal
  • Narrow bracket > friction than wider bracket (due to critical angle)
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15
Q

Wire material - Friction

A
  • Beta- titanium > friction than Niti > friction than SS.
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16
Q

Ligation material - Friction

A
  • Elastomeric ligature > friction than SS ligature
  • 60%- 70% more
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17
Q

Which moment effect by friction ?

A
  • Tipping and bodily moment
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18
Q

Bracket material types?

A
  • Metal
  • Ceramic
  • Polycarbonate
    -Polyurethane
19
Q

Morphology of brackets?

A
  • Siamese
  • Mini twin
    -Single twin
  • Self ligating
  • Tip-edge
20
Q

Slot size

A
  • 0.018X 0.028
  • 22x28 common uk
  • 22x30 eases tying auxiliary/piggybacks
21
Q

Bracket - Metal

A
  • Austentistic stainless steel
  • If NiTi allergy can consider : Titanium , Cobalt chromium
22
Q

Bracket - Bases

A
  • Mesh commonly used fine or coarse, single 2 and 3 ply available
  • Spherical photo etched undercut
  • Undercut channels
  • Polymer coated
23
Q

Bracket - Configuration

A
  • Straightwire or Pre adjusted edgewise system
  • Commonly used we
24
Q

Bracket - Siamese

A
  • Four tie wings for better rotational control
25
Q

Bracket - Self ligation

A
  • Speed
  • In - Ovation
  • smart clip
  • Damon
26
Q

Bracket - 22x28

A
  • most common in UK 0.022 height
  • 0.028 width
  • Some brackets are deeper
27
Q

Andrews prescription

A
  • This is from originator of pre adjusted edgewise appliance system
28
Q

MBT prescription

A
  • More lingual crown torque lower LBS
  • less crown torque lower second molar.
  • More labial torque upper incisors
  • reduced tip
29
Q

Self ligating brackets - Advantages

A
  • Full archwire engagement
  • Less Charside assistance required
  • Less chair side time required
  • less number of appointments
  • Improved infection control
30
Q

Self ligating - Disadvantage

A
  • Takes practice
  • Clip fracture / open b/w appointment
    -No partial ligation
  • wire sliding round
  • Cost
  • no evidence of faster alingment
31
Q

Why static friction?

A
  • Teeth do not slide but walk with along archwire with small tipping and uprighting movements
32
Q

Begg appliance

A
  • Light wire appliance
33
Q

What’s range

A
  • Distance wire behaves elastically before deform
34
Q

Define strength

A
  • Stifness x strain
35
Q

Formablity

A
  • amount of permanent deformation without fracture
36
Q

SS wire composition

A
  • 71 % Fe
  • 18% Cr
  • 8 Ni
37
Q

Niti composition

A

-52% Ni
- 43%
-3%

38
Q

Cobalt chromium

A
  • 40% Co
  • 20 % Cr
  • 15% Ni
  • ## 15 % Fe
39
Q

GIC made of?

A
  • Glass poly alkenoate cement
40
Q

GIC - Band cement types

A
  • Conventional glass ionomer - acid / base cement reaction
  • Resin modified GIC- dual cure -acid base light cure
  • Resin modified GIC - tri cure - Acid base / light cure/ chemical
  • Compomer - Acid base reaction / chemical or light
41
Q

Composite

A
  • Resin BisGMA. Coupling agent
  • Usually filled diacrylics
42
Q

Unfilled resin primer - Bond

A
  • Methyl methacrylate monomer
43
Q

Self etch

A
  • decreased no of steps in bond up
  • Decreased enamel loss during etch
  • Do not require rinsing , pt comfort
  • Clinical performance as good as conventional

Orthodontics (53 decks)

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