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Dental material science > Intro > Flashcards

Intro Flashcards

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1
Q

What is a CE mark

A

A mark indicating the material is safe

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2
Q

What restorative materials will we use

A

Amalgam
Composites
Glass ionomer cements
Porcelain
Compomers

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3
Q

What are the impression materials

A

Impression Compound​

Impression Paste​

Hydrocolloids​
-alginate​

Elastomers: ​
-polysulphides​
-polyethers​
-silicones

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4
Q

What materials are metals and alloys

A

Amalgam​

Cobalt chromium​

Titanium​

Gold​

Stainless steel

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5
Q

What types of force are there

A

Compressive (down)
Tensile (pulled)
Shear (pushed from side)

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6
Q

What is the equation for stress

A

Force/unit area
units = pascal

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7
Q

How is strain calculated

A

Change in length/original length x 100

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8
Q

What are the mechanical properties of enamel

A

Brittle
Hard
Strong
Rigid

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9
Q

What is the typical biting force

A

500-700N

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10
Q

What are the retention properties of amalgam and composite

A

Amalgam - mechanical
Composite - adhesive

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11
Q

What is abrasion resistance

A

ability to withstand surface layers being removed, so compromising surface integrity

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12
Q

What does hardness within a dental material allow for

A

Ability of surface to resist indentation

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13
Q

When a material gradually changes dimensions when forces are aapplied…

A

Creep

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13
Q

What causes fatigue within a material

A

Repetitive ‘small’ stresses causing the material to fracture

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14
Q

What is the difference between creep fatigue and deformation

A

Deformation is caused by stress alike fatigue however it results im permanent change to dimensions instead of fracture
Creep also results in dimensional change but gradually due to repetitive small forces

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15
Q

What is DE-BOND

A

applied forces sufficient to break material-tooth bond

16
Q

What is impact

A

Large sudden force which causes fracture

17
Q

What causes most fractures

A

Fatigue- repeated loads are applied causing small flaws/cracks resulting in the risk of fracture under a small force

18
Q

When is debonding used in dentistry

A

To remove orthodontic appliance, shear force is applied to separate bracket/bonding material from tooth surface

19
Q

What are classed as mechanical properties

A

Hardness
Brittle/ductile
Flexible/rigid
Stength

20
Q

What are chemical properties

A

setting mechanism​

setting time​

corrosive potential

21
Q

What are physical properties

A

viscosity​

thermal conductivity​

thermal expansion​

density​

radiodensity

22
Q

Why is there little evidence for the performance of dental materials in vivo

A

Time-consuming
Costly
Limited in scope: retrospective/prospective

Dental material science (5 decks)

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