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BDS2 DMS > Typical Values > Flashcards

Typical Values Flashcards

0
Q

What are the typical values for bond strength of composites to enamel/dentine?

A

40MPa

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1
Q

What are the typical values for biting force?

A

500-700N (50-70kg)

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2
Q

What are the typical values for bond strength of GIC to enamel/dentine?

A

5MPa

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3
Q

What are the typical values for thermal expansion of amalgam?

A

3 times that of tooth (enamel is about 11.4ppm/C, dentine is about 8.3ppm/C)

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4
Q

What are the typical values for creep of different types of amalgam?

A

Traditional lathe 6.3%
Traditional spherical 1.1%
High Cu dispersion 0.46%
High Cu single 0.07%

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5
Q

What are the typical values for compressive strength of amalgam after 1 hour?

A

Lathe 45MPa
Spherical 120MPa
High Cu dispersion 118MPa
High Cu single 272MPa

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6
Q

What are the typical values for compressive strength of amalgam after 7 days?

A

Lathe 302MPa
Spherical 370MPa
High Cu dispersion 387MPa
High Cu single 485MPa

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7
Q

What are the typical values for tensile strength of amalgam?

A

60MPa

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8
Q

What are the typical values for thermal expansion coefficient of composites?

A

28ppm/C (which is high compared to enamel 11.4ppm/C and dentine 8.3ppm/C)

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9
Q

What are the typical values for compressive strength of composites?

A

300+MPa

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10
Q

What are the typical values for compressive strength of GIC?

A

80-110MPa

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11
Q

What are the typical values for the unreacted (free) monomer after heat cured and chemical cured acrylic reactions? Why is this a concern?

A

Chemical cured (self-cured) 3.5%
Heat cured 0.2-0.5%
Free monomer acts as an irritant

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12
Q

What are the typical values for Young’s modulus of composites?

A

15,000MPa (15GPa)

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13
Q

What is the compressive strength of gypsum?

A

20-35MPa

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14
Q

What is the expansion of gypsum?

A

plaster: 0.2-0.3%
stone: 0.08-0.1%
densite: 0.05-0.07%

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15
Q

What is the setting time and working time for polyethers/addition silicones?

A

setting time: polyethers = 5mins, addition silicones = 6mins

working time: polyethers = 2mins, addition silicones = 4mins

BDS2 DMS (5 decks)

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