Elastomers Flashcards

1
Q

What are the 2 types of elastomers?

A
  • Polyether

- Addition silicones

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2
Q

What are the key properties you need to assess for elastomer IM’s? (8 points)

A
  • Flow/viscosity
  • Surface detail
  • Wettability
  • Elastic recovery
  • Stiffness (flexibility)
  • Tear strength
  • Mixing time
  • Working time
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3
Q

In the ISO regulations, the grooves/indentation of either __um or __um (depending on material viscosity) are replicated?

A

20 or 50

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4
Q

What is it that is in elastomer materials that ensures exceptional precision and excellent reproduction of anatomical details?

A
  • The combination of the polymer and innovative spheroid silicon micro-fillers
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5
Q

What are the properties of IM’s that relate to the quality of surface interaction between material & tooth/soft tissue surfaces? (2 points)

A
  • Viscosity

- Surface wetting

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6
Q

What are the properties of IM that are related to accurac y? (2 points)

A
  • Surface reproduction

- Visco-elasticity/ elastic recovery

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7
Q

What are the properties of IM’s that relate to dealing with the removal and undercuts? (2 points)

A
  • Tear/tensile strength

- Rigidity (flexibility)

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8
Q

What must the viscosity of IM’s be like?

A

Must be able to flow readily

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9
Q

What must the surface wetting of IM’s be like?

A

Must make intimate contact with the teeth/mucosa

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10
Q

What is viscosity?

A

A measure of material’s ability to flow

  • Determines a material’s potential for making close contact with hard/soft tissue surfaces
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11
Q

What must the surface wetting of IM’s be like?

A
  • IM must make intimate contact with teeth/mucosa surfaces

- SO ALL OF THE SURFACE is replicated

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12
Q

Ideally, what do we want the elastic recovery of an IM to be like?

A
  • want 100% elastic recovery

- NO permanent strain

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13
Q

What is viscoelastic behaviour?

A
  • When IM, having been stretched/compressed on removal from mouth, fails to return to its original dimensions/shape
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14
Q

What do we want the viscoelastic behaviour of IM’s to be like?

A

Want low viscoelasticity (small deformation)

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15
Q

What is tear strength?

A

The stress a material will withstand before fracturing

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16
Q

What do we want the rigidity of IM’s to be?

A

Has low rigidity as want the IM to be flexible