L116: Fundamentals of Dental Materials Science Flashcards

1
Q

What are the main things to consider when choosing a dental material?

A
  • What is available for the treatment?;
  • Is it fluoride releasing?;
  • Composition;
  • Characteristics;
  • Working and setting time.
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2
Q

What is amalgam creep?

A

The movement (change of shape and protrusion) of amalgam over time.

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3
Q

What kind of forces can cause amalgam to fracture over time?

A

Continuous low level forces

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4
Q

What component of composite filling determines its viscosity?

A

Glass filler particles

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5
Q

What is the purpose of etching teeth prior to the application of composite?

A

To create a rough surface on the tooth, leading to better adhesion to the tooth material and surrounding enamel

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6
Q

What is the purpose of fluoride releasing restorative materials?

A

To increase the enamel’s resistance to development of caries

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7
Q

Does amalgam or composite resist compressive strength/ fracturing best?

A

Amalgam

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8
Q

What is thermal expansion and why must restorative material expand/contract?

A

Expansion and contraction with the tooth material to prevent microleakage and further caries

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9
Q

Low viscosity impression materials…

A

are most accurate for recording tooth surface detail.

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10
Q

High viscosity impression materials…

A

are most dimensionally stable after setting and removing.

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11
Q

Which type of impression material is used in impression trays?

A

High viscosity

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12
Q

Which type of impression material is used around individual teeth?

A

Low viscosity

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13
Q

Give an example of a negative replica:

A

Impression

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14
Q

Give an example of a positive replica:

A

Dental cast

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15
Q

Young’s modulus =

A

Elasticity

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16
Q

Viscosity is:

A

The ability to flow

17
Q

Elasticity is:

A

The ability to return to to its original shape upon the removal of an applied force

18
Q

Rigidity is:

A

A measure of how much force is needed to cause a temporary change in the shape of material

19
Q

Compressive strength is:

A

The ability to withstand applied compressive forces without fracturing

20
Q

Hardness is:

A

The ability of a surface to withstand indentation and resist abrasion (i.e. removal of a surface layer)

21
Q

Creep is:

A

Change in shape due to repetitive application of small forces