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Dental Materials > DM1 - Introduction to Dental Materials > Flashcards

DM1 - Introduction to Dental Materials Flashcards

1
Q

What does a dental resin composite consist of?

A
  • resin
  • filler
  • coupling agent
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2
Q

What is a dental composite?

A

combination of materials in which the individual components retain their identity and which possess different properties to the components acting alone

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3
Q

what is dental composite used for?

A
  • restorative (filling) material

- special tray construction

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4
Q

what are the properties of fibre rein-forced material?

A
  • consists of fibres of high strength and modulus
  • embedded to a matrix
  • maintains a distinct interface between components
  • kevlar and light weight
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5
Q

dental fibre reinforced materials attempt at what? (4)

A
  • construction and reinforcement of denture bases
  • inlays and inlays
  • crowns and bridges
  • posts to reinforce and restore root treated teeth
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6
Q

why is a knowledge of applied materials required? (3)

A
  • facultative effective use
  • permit clinical problem solving
  • promote effective dialogue within personnel of profession
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7
Q

what was the Medical Devices Directive changes implemented?

A

March 2010

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8
Q

What are the legal requirements relating to the prescription of laboratory made dental appliances? (3)

A
  • statement of manufacture offered to all patients receiving dental appliance
  • GDC invites patients to ask for such a certificate
  • MHRA enforce directive. Failure to offer statement is a criminal offence
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9
Q

what is included in a statement of manufacture?

A
  • patients name and confirmation made for them
  • prescribers name and registered address
  • technicians name and registered address
  • description of the appliance
  • confirmation meets legal standards
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10
Q

What is the oral environment subjected to?

A
  • loading to 6Kg
  • on/off cyclical forces (fatigue)
  • chemicals
  • temperature fluctuations
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11
Q

What is the name for the shock absorber which teeth are suspended in?

A

periodontal ligament

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12
Q

what force intrudes the tooth?

A

1N

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13
Q

what force flexed the bone and causes pain?

A

15N

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14
Q

What can pH of the oral environment fluctuate to?

A

2-12

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15
Q

What materials are used by the dental team?

A
  • gypsum materials (plaster)
  • waxes
  • polymers
  • ceramics
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16
Q

What is the name of the two standards institutions?

A
  • British Standards Institution (BSI)

- International Standards Organisation (ISO)

17
Q

what is strain?

A

change in the original length of material and has no units

18
Q

what is stress expressed as?

A

Mpa where A is in mm2 and F in newtons

19
Q

What is the name for the linear region of curve stress/strain? It gives a measure of stiffness

A

modulus

20
Q

What is the name of the mechanical property where a force is applied to elongate the rod?

A

tensile

21
Q

What is the name for the mechanical property which is not recommended for brittle materials?

A

comprehensive

22
Q

What is the name for the mechanical property which is useful for brittle materials where conventional tensile is not applicable?

A

Diametral tensile strength

23
Q

What is the name for the mechanical property which has 3 points?

A

flexural

24
Q

What is the name for the potential for a material to be drawn out into a wire? It is the difference between the two linear lines

A

ductility

25
Q

What does it measure if the graph is shaded under the linear portion?

A

resilience

26
Q

What does it measure if the whole graph is shaded?

A

toughness

27
Q

What does it measure if the whole graph is shaded?

A

adhesive failure

28
Q

What is it called when only one side is broken?

A

cohesive failure

29
Q

How do you measure surface roughness?

A

profilometer

30
Q

What is the name for the study of viscosity and how it varies with rate of shear and time?

A

Rheological properties

31
Q

What defines the chemical reactivity of metals and alloys (an electrolytic property)?

A

corrosion

32
Q

how are biological properties tested?

A
  • laboratory screening
  • limited lavatory in vivo usage testing
  • human randomised controlled clinical trial
33
Q

what is the idea biological properties of a material? (4)

A
  • non toxic
  • non irritant
  • harmless to dental pulp
  • no carcinogenic potential

Dental Materials (4 decks)

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