REMOVEABLE ORTHO BASICS Flashcards

1
Q

Components of stainless steel?

A

72% iron

18% chromium

8% nickel

1.7% titanium

.3% carbon

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2
Q

What movement can a removable orthodontic appliance do?

A

Tipping movements

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3
Q

How do teeth move via orthodontic appliances?

A

Constant and prolonged force applied

This leads to increased osteoclast activity on side away from force so bone resorbs allowing tooth to be moved, behind the tooth osteoblasts lay new Bone in the existing space.

(Bone remodelling)

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4
Q

Give some advantages of an upper removable appliance

A

Cheaper

Simple management - less chairside

Easier for pt to maintain oral hygiene

Less tooth prep

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5
Q

Give some cons of an URA

A

Relies on pt compliance

Only will tip or tilt a tooth

Only move 1-2 teeth a time

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6
Q

In what ways heat cure PMMA > self cure PMMA?

A

Heat cure is stronger and dimensionally stable

Heat cure only polymerise at certain heat due - increased working time

Heat burns off residual free radicals

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7
Q

If heat cure properties are better, why use self cure? In what case may you use heat cure?

A

Self cure takes 15 mins to set whereas heat cure process takes upwards to 13 hours

would use heat cure in individuals that are allergic to the monomer in self cure - as more free radicals

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8
Q

What are the active oral forces?

A
  • mastication
  • gravity
  • speech
  • tongue movements
  • the active component
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9
Q

What mm wire is used for which areas?

A

Retentive = .7mm HSSW

Stops = .7mm HSSW

Active component = .5mm HSSW

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10
Q

Give the names of the different components of the adams clasp

A

Bridge

Arrowhead

S bend

Flyover

Leg

Tag

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11
Q

What is the acronym for contents of a RA?

A

A - active component

R - retention

A - anchorage

B - baseplate

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12
Q

What is the active component?

A

Component that exerts the prolonged force on the desired tooth

Usually a spring or screw

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13
Q

What is anchorage?

A

Resistance forces to unwanted tooth movement. Newton’s third law = equal and opposite reaction

Usually provided by baseplate as it dissipates forces

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14
Q

What function does the baseplate play?

A

Connects active component, clasps

Retention through adhesion and cohesion

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