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Dental Materials > Resin-based composits > Flashcards

Resin-based composits Flashcards

1
Q

What are some simple examples of vinyl polymers?

A

Poly ethylene, polyvinyl chloride, poly propylene

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2
Q

How are the free radicals in the polymerization activated?

A

Heat, chemical at room temp, and light.

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3
Q

What is the chemical group responsible for activation by light?

A

Camphoquinone

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4
Q

What will stabilizers do when mixed with polymers?

A

Stops auto-polymerization.

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5
Q

What is meant by oxygen inhibition in polymerization?

A

It is the surface layer that is exposed to air that will not polymerize.

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6
Q

What is the material used in dentures?

A

Poly methyl methacrylate.

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7
Q

What is the material most restorative materials are made from?

A

Bisphenol A glycidyl methacrylate (BisGMA)

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8
Q

What is an alternative to BisGMA?

A

Urethane dimethacrylate (UDMA)

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9
Q

What is the material used in all resin materials to help decrease viscosity?

A

Triethyleneglycol dimethacrylate (TEGDMA) Issue is that it can diffuse out of plastic and into dental pulp.

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10
Q

What is a composite?

A

Any material comprising a matrix surrounding at least one other phase. IE matrix and glass.

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11
Q

What are some reasons that make resin based composites useful in dentistry?

A

Can be made to match teeth. Flowable and then set. Can be used as fissure sealants.

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12
Q

What are the filler particles used in resin-based composites?

A

Glass.

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13
Q

What is silane coupling used for?

A

Used so the resin sticks to the glass.

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14
Q

What are the characteristics of fill associated with the following: Strength, shrinkage, flow, packability, color.

A

Increasing the size and amount will increase strength. More fill gives less shrinkage. More fill means less flow. More fill means more packable. Color is carried in the glass and con be easily modified.

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15
Q

How is bonding to enamel compared to bonding of dentin?

A

Bonding to enamel is great. Bonding to dentin is questionable due to the water that is present.

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16
Q

What is the purpose of HEMA?

A

It is applied as a hydrophilic liquid allowing it to penetrate dentin. It then turns slightly hydrophobic upon drying and will bond well to resins.

17
Q

How much do dental resins shrink on curing?

A

About 1%.

18
Q

What is the issue of incomplete polymerization on curing?

A

When bonding to dentin, the Hema and TEGDMA monomers can diffuse into the dentin.

19
Q

What causes the break down of resins in a restoration?

A

Many of the enzymes in the mouth.

20
Q

What can we do to help deal with some of the shrinkage of resin based restorations?

A

Using primers and restoring in layers.

Dental Materials (10 decks)

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