Introduction to Dental Materials Science Flashcards

1
Q

what clinical stages does the behaviour of dental materials affect?

A

selection, preparation, placement, performance, patient expectations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what mark indicates that a material is safe to use?

A

CE mark

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what are the different options for restorative materials?

A

amalgam, composites, glass ionomer cements, compomers, porcelain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what are the main types of impression materials?

A

impression compound, impression paste, hydrocolloids, elastomers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what type of impression material is alginate?

A

hydrocolloid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what are the different types of elastomers?

A

polysulphides, polyethers, silicones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what are the different types of metals/alloys?

A

amalgam, cobalt chromium, titanium, gold, stainless steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what are the different groups of properties a material can have?

A

mechanical, chemical and physical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what does force applied to the material cause?

A

stretch/compress, deform, fracture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the different types of force?

A

compressive (vertical forces pushing material together), tensile (horizontal forces pulling material apart) and shear (force coming from one side pushing the material)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

on the stress strain curve where is the proportional limit?

A

where the slope ends and starts to curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

on the stress strain curve what is the elastic modulus?

A

the angle between the slop and the strain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

on the stress strain curve what is the fracture stress?

A

the end of the entire line at the curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what are the mechanical properties of enamel?

A

brittle, hard, strong and rigid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what type of force is the tooth subjected to when biting

A

compressive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what type of force is experienced when grinding/chewing?

A

frictional

17
Q

what type of force removes materials which are adhered to enamel

A

shear forces by mastication

18
Q

what are the different ways that materials fail?

A

fracture, hardness, abrasion, abrasion resistance, fatigue, creep, deformation, de-bond, impact

19
Q

how does a material fracture?

A

biting forces gradually increased to fracture point

20
Q

describe the hardness test

A

an indentor with a 100g mass is applied to one spot on the material

21
Q

how does abrasion occur?

A

tooth grinds/slides along the opposing tooth surface so the tooth surface is abraded

22
Q

what occurs due to fatigue?

A

when repeated loads are applied, small flaws in a material grow allowing fracture when only a relatively small force is applied

23
Q

what is creep?

A

repetitive forces cause dimensional change

24
Q

what causes permanent deformation?

A

releasing stress that is greater than the materials elastic limit

25
what are the different chemical properties?
setting mechanism, setting time, corrosive potential
26
what are the different physical properties?
viscosity, thermal conductivity, thermal expansion, density, radiodensity