DentMat long quiz Flashcards
1
Q
Characteristics of metals
A
Hard, opaque, shiny, conductive
2
Q
Characteristics of metals in heat
A
Elastic and plastic
3
Q
Its hammered without breaking
A
Malleable
4
Q
Characteristic where in it is fused or melted
A
Fusible
5
Q
Define ductile
A
Drawin into thin wire
6
Q
Usage of metals in dentistry
A
Restorations, implants, instruments
7
Q
These are restorations inside cusps
A
Inlays
8
Q
What are onlays
A
Extended over cusps
9
Q
Indirect restorations are/ is?
A
Procedures done outside the mouth
10
Q
What are veneers?
A
Metal layer on tooth
11
Q
Its defined as fixed prostheses
A
Dental bridge
12
Q
Its defined as artificial tooth roots
A
Dental implants
13
Q
What is the key material in dental implants?
A
titanium alloy
14
Q
What is a property of metals?
A
Ionizes positively
15
Q
What is ionization?
A
Gaining or losing electrons
16
Q
Metals release these during ionization
A
Electrons
17
Q
Key importance why metals are used in dentistry
A
they have stable ions
18
Q
what is metalloid?
A
in between metal and non metal
19
Q
What are dental alloys?
A
Metallic properties with metals
20
Q
Name a requirement of dental metals
A
Resistant to tarnish
21
Q
What are the working requirements for dental amalgam?
A
Ease of casting, soldering, burnishability
22
Q
What is dental amalgam?
A
Alloy of metals with mercury
23
Q
When was the first dental amalgam produced?
A
1891
24
Q
Who produced the first dental amalgam?
A
Bell of England
25
What did the craw cour brothers create?
royal mineral succedaneum
26
what sparked the amalgam war?
opposition from practitioners
27
what are the claimed systemic effects were reported from amalgam?
depression, nervousness, death
28
What resolution did the american society of dental surgeons pass in 1845
amalgam as malpractice
29
what year did the american society of dental surgeons adopt the no use of amalgam?
1861
30
he conducted the first research program on amalgam in 1861
John Tomes
31
What year did Charles Tomes measure shrinkage and expansion?
1871
32
what percentage of silver is in Blacks amalgam?
72.5
33
What was the impact of Blacks formula in using amalgam?
improved dimensional stability of amalgam
34
what percentage of tin is in Blacks amalgam?
27.5
35
When was the minimal mercury technique introduced?
1959
36
What is the composition of high copper amalgams?
Ag-41-70%, Sn 15-30% Cu-12-28%
37
What is an advantage of high copper amalgams?
High compressive strength
38
What is the disadvantage of high copper amalgams?
Lack of esthetics
39
What are the types of amalgam?
Lathe cut
Spherical cut
blended
40
What are lathe-cut amalgam known for?
Big particles
41
What is the advantage of spherical cut particles in dental fillings?
Need lower Hg
42
What is a characteristics of high copper amalgam?
High liquid Hg alloy
43
What does the blended formulation of amalgam involve?
lathe and spherical cut
44
What element is 1% in traditional/conventional amalgam?
Cu
45
What are the main elements in traditional lower copper amalgam?
Ag, Sn,Zn
46
Function of silver in alloy
whitens, decreases creep
47
Reduces tarnish in alloy
tin
48
Function of copper in alloy
increases hardness
49
function of zinc in alloy
acts as deoxidizer
50
51
Cause of delayed expansion
Zn+moisture
52
Start of delayed expansion (amalgam)
3-5 days
53
Amalgam manipulation step 1
selection of alloys
54
Amalgam manipulation step 2
Proportioning and dispensing
55
Amalgam manipulation step 3
Trituration
56
Amalgam manipulation step 4
condensation
57
Amalgam manipulation step 5
carving
58
Amalgam manipulation step 6
burnishing
59
Amalgam manipulation step 7
finishing and polishing
60
Most convenient alloy dispensing method?
Pre-weighrd pellets
61
Purpose of trituration?
dissolve and pulverize alloy
62
Final step in mixing amalgam?
mulling
63
Devices separating alloy and Hg in capsules?
disk or membrane
64
Equipment used for trituration?
mortar and pestle
amalgamator
65
What is mulling?
Continuation of trituration
66
what does mulling increase?
homogeneity of mass
67
result of mulling
single consistent mix
68
What is the purpose of finishing and polishing in dental restorations?
remove amalgam flash and scratches
69
How does polishing benefit dental restorations?
decreases fatigue failure and plaque adherence
70
When should you polish a dental restoration?
after 24-48hrs
71
what type of current is generated by a contact between two dissimilar metals?
electric current
72
What are the requirements for electric current generated by a contact between two dissimilar metals?
functional requirements
73
To resist permanent deformation What to absorb energy to fracture under sudden load High modulus of elasticity To resist deformation High ductility?
high impact strength
74
To absorb energy of what energy?
Elastic deformation
75
What is the Hg needed to mix the alloy?
Zn, Cu
76
What are the three types of trituration?
amalgam
mercury
77
What is the structure of triturate Amalgam?
granular
78
What is the proportion of a pen grasp technique?
5-20sec
79
What type of embrasures do mpatible marginal ridges have?
physiologically compatibile embrasures
80
Carving is always from what surface?
tooth surface
81
to resist permanent deformation
high yeild strenght
82
to resist deformation
high modulus of elasticity
83
to facilitate burnish ability
high ductility
84
To absorb energy of elastic deformation so that not all stresses will be transmitted to the supporting patient structures
High resilience
85
To preserve the finished and polished surface
High hardness
86
Amalgam pledge adopted by this organization not to use amalgam
1845
87
Copper amalgam was used in attempts were made to increase strength of amalgams by increasing copper content of the traditional amalgam alloy
Early 1900
88
Enumarate the advantages of dental amalgam
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
Enumerate the disadvantages of dental amalgam
Lack of esthetics
Less conservative
Non-insulating
Corrosion and galvanism
Lack of reinforcement of weakened tooth structure
Difficulty in restoring proper tooth anatomy
90
Occurs when two dissimilar metallic materials
are in contact within an electrolyte resulting in
current to flow between the two
galvanic corrosion
91
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)
Biocompatibility
92
Biological requirements
Not allergic
Cause no health hazards
Resistant to tarnish and corrosion
93
Percolation
contraction that makes a gap between the tooth and amalgam, leads to secondary decay
94
Amalgam in the presence of saliva, saliva will react
with zinc and will cause bubbles that will lead to
late expansion
95
My name consists of three letter, it starts with B, ends with A, and has a middle letter E, whats my name?
Hint? you cant spell beautiful without my name🐝
