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3RD year > DentMat long quiz > Flashcards

DentMat long quiz Flashcards

1
Q

Characteristics of metals

A

Hard, opaque, shiny, conductive

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2
Q

Characteristics of metals in heat

A

Elastic and plastic

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3
Q

Its hammered without breaking

A

Malleable

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4
Q

Characteristic where in it is fused or melted

A

Fusible

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5
Q

Define ductile

A

Drawin into thin wire

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6
Q

Usage of metals in dentistry

A

Restorations, implants, instruments

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7
Q

These are restorations inside cusps

A

Inlays

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8
Q

What are onlays

A

Extended over cusps

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9
Q

Indirect restorations are/ is?

A

Procedures done outside the mouth

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10
Q

What are veneers?

A

Metal layer on tooth

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11
Q

Its defined as fixed prostheses

A

Dental bridge

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12
Q

Its defined as artificial tooth roots

A

Dental implants

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13
Q

What is the key material in dental implants?

A

titanium alloy

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14
Q

What is a property of metals?

A

Ionizes positively

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15
Q

What is ionization?

A

Gaining or losing electrons

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16
Q

Metals release these during ionization

A

Electrons

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17
Q

Key importance why metals are used in dentistry

A

they have stable ions

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18
Q

what is metalloid?

A

in between metal and non metal

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19
Q

What are dental alloys?

A

Metallic properties with metals

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20
Q

Name a requirement of dental metals

A

Resistant to tarnish

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21
Q

What are the working requirements for dental amalgam?

A

Ease of casting, soldering, burnishability

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22
Q

What is dental amalgam?

A

Alloy of metals with mercury

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23
Q

When was the first dental amalgam produced?

A

1891

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24
Q

Who produced the first dental amalgam?

A

Bell of England

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25
Q

What did the craw cour brothers create?

A

royal mineral succedaneum

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26
Q

what sparked the amalgam war?

A

opposition from practitioners

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27
Q

what are the claimed systemic effects were reported from amalgam?

A

depression, nervousness, death

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28
Q

What resolution did the american society of dental surgeons pass in 1845

A

amalgam as malpractice

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29
Q

what year did the american society of dental surgeons adopt the no use of amalgam?

A

1861

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30
Q

he conducted the first research program on amalgam in 1861

A

John Tomes

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31
Q

What year did Charles Tomes measure shrinkage and expansion?

A

1871

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32
Q

what percentage of silver is in Blacks amalgam?

A

72.5

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33
Q

What was the impact of Blacks formula in using amalgam?

A

improved dimensional stability of amalgam

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34
Q

what percentage of tin is in Blacks amalgam?

A

27.5

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35
Q

When was the minimal mercury technique introduced?

A

1959

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36
Q

What is the composition of high copper amalgams?

A

Ag-41-70%, Sn 15-30% Cu-12-28%

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37
Q

What is an advantage of high copper amalgams?

A

High compressive strength

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38
Q

What is the disadvantage of high copper amalgams?

A

Lack of esthetics

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39
Q

What are the types of amalgam?

A

Lathe cut
Spherical cut
blended

40
Q

What are lathe-cut amalgam known for?

A

Big particles

41
Q

What is the advantage of spherical cut particles in dental fillings?

A

Need lower Hg

42
Q

What is a characteristics of high copper amalgam?

A

High liquid Hg alloy

43
Q

What does the blended formulation of amalgam involve?

A

lathe and spherical cut

44
Q

What element is 1% in traditional/conventional amalgam?

45
Q

What are the main elements in traditional lower copper amalgam?

46
Q

Function of silver in alloy

A

whitens, decreases creep

47
Q

Reduces tarnish in alloy

48
Q

Function of copper in alloy

A

increases hardness

49
Q

function of zinc in alloy

A

acts as deoxidizer

51
Q

Cause of delayed expansion

A

Zn+moisture

52
Q

Start of delayed expansion (amalgam)

53
Q

Amalgam manipulation step 1

A

selection of alloys

54
Q

Amalgam manipulation step 2

A

Proportioning and dispensing

55
Q

Amalgam manipulation step 3

A

Trituration

56
Q

Amalgam manipulation step 4

A

condensation

57
Q

Amalgam manipulation step 5

58
Q

Amalgam manipulation step 6

A

burnishing

59
Q

Amalgam manipulation step 7

A

finishing and polishing

60
Q

Most convenient alloy dispensing method?

A

Pre-weighrd pellets

61
Q

Purpose of trituration?

A

dissolve and pulverize alloy

62
Q

Final step in mixing amalgam?

63
Q

Devices separating alloy and Hg in capsules?

A

disk or membrane

64
Q

Equipment used for trituration?

A

mortar and pestle
amalgamator

65
Q

What is mulling?

A

Continuation of trituration

66
Q

what does mulling increase?

A

homogeneity of mass

67
Q

result of mulling

A

single consistent mix

68
Q

What is the purpose of finishing and polishing in dental restorations?

A

remove amalgam flash and scratches

69
Q

How does polishing benefit dental restorations?

A

decreases fatigue failure and plaque adherence

70
Q

When should you polish a dental restoration?

A

after 24-48hrs

71
Q

what type of current is generated by a contact between two dissimilar metals?

A

electric current

72
Q

What are the requirements for electric current generated by a contact between two dissimilar metals?

A

functional requirements

73
Q

To resist permanent deformation What to absorb energy to fracture under sudden load High modulus of elasticity To resist deformation High ductility?

A

high impact strength

74
Q

To absorb energy of what energy?

A

Elastic deformation

75
Q

What is the Hg needed to mix the alloy?

76
Q

What are the three types of trituration?

A

amalgam
mercury

77
Q

What is the structure of triturate Amalgam?

78
Q

What is the proportion of a pen grasp technique?

79
Q

What type of embrasures do mpatible marginal ridges have?

A

physiologically compatibile embrasures

80
Q

Carving is always from what surface?

A

tooth surface

81
Q

to resist permanent deformation

A

high yeild strenght

82
Q

to resist deformation

A

high modulus of elasticity

83
Q

to facilitate burnish ability

A

high ductility

84
Q

To absorb energy of elastic deformation so that not all stresses will be transmitted to the supporting patient structures

A

High resilience

85
Q

To preserve the finished and polished surface

A

High hardness

86
Q

Amalgam pledge adopted by this organization not to use amalgam

87
Q

Copper amalgam was used in attempts were made to increase strength of amalgams by increasing copper content of the traditional amalgam alloy

A

Early 1900

88
Q

Enumarate the advantages of dental amalgam

A

Ease of use
High compressive strength
Excellent wear resistance
Favorable long-term clinical results
Economic
Can be bonded to tooth structure
Self-sealing ability

89
Q

Enumerate the disadvantages of dental amalgam

A

Lack of esthetics
Less conservative
Non-insulating
Corrosion and galvanism
Lack of reinforcement of weakened tooth structure
Difficulty in restoring proper tooth anatomy

90
Q

Occurs when two dissimilar metallic materials
are in contact within an electrolyte resulting in
current to flow between the two

A

galvanic corrosion

91
Q

This is achieved by the use of solution alloy
(combination of 2 or more metals, which are
completely soluble in each other in both liquid or solid
states)

A

Biocompatibility

92
Q

Biological requirements

A

Not allergic
Cause no health hazards
Resistant to tarnish and corrosion

93
Q

Percolation

A

contraction that makes a gap between the tooth and amalgam, leads to secondary decay

94
Q

Amalgam in the presence of saliva, saliva will react
with zinc and will cause bubbles that will lead to

A

late expansion

95
Q

My name consists of three letter, it starts with B, ends with A, and has a middle letter E, whats my name?

A

Hint? you cant spell beautiful without my name🐝

3RD year (12 decks)

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