Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Dental Materials > Biomechanics > Flashcards

Biomechanics Flashcards

(59 cards)

Start Studying
1
Q

What are the goals of dental materials

A

longevity, function properly, aesthetics, patient satisfaction

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

Model of dental materials

A

similar to tooth structure, properties, and composition

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

What are the limitations of dental materials?

A

cannot know everything about a given material/system, have to choose parameters

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

Define measure (surface properties)

A

contact angle used to measure how liquid interacts w/ solid

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

Define good wetting

A

low contact angle

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

Define poor wetting

A

high contact angle

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

What are some clinical consequences of surface properties?

A

bonding time, cell attachment (sheer strength), hydrophilic/phobic, and surface area/roughness

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

What makes sealants

A

a slowable resin with NO filler that is clear

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

Is HEMA hydrophobic or hydrophilic?

A

possesses both

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

What is an advantage of hydroPHILIC primers?

A

low viscosity and allows for attachment to composite

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

Is tooth structure (dentin) hydrophobic or hydrophilic

A

hydrophobic

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

Where is surface wetting important?

A

anytime two different materials come in contact, impression materials, adhesives, bacterial adhesion

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

What does primary bonding affect?

A

chemical and electrochemical reactions

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

What does secondary bonding affect?

A

adsorption (onto) and absorption (into)

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

How are metals affected?

A

corrosion or spontaneous destructive oxidation

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

what metal do not corrode?

A

gold, platinum, titanum and palladium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Define active corrosion

A

leads to destruction via gamma 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Define passive corrosion

A

production od corrive film that prevents further corrosion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Define immune corrosion

A

noble metals (full valence octet)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the components of electrochemical corrosion?

A

anode, cathode, circuit, and electrolights in solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is an anode?

A

corroded metal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is a cathode

A

a passive supplier of electrons to solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are the four types of corrosion?

A

glavanic, structural selective, cervice (crack), stress

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Define chemical dissolution

Study These Flashcards
A

dissolution of oxides created by hydrogen bonding effect of water in local areas of high acidity

25
What does absorption of water affect polymers?
the secondary bonds cause 3D changes and the primary bonds of the polymer breaks piece by piece
26
What are the concerns of biological properties?
No adverse reaction, toxicity, and sensitivity to react/degrade
27
Define mechanical properties
how a material responds to loads/forces
28
What are the three types of single dimension forces?
Compression (push together) Tension (pull apart) Shear (opposing forces)
29
What are the three types of combination forces?
Torsion (twisting) flexsion (tensile or bending) Diametral compression (capable of being stretched)
30
What is the correlationn between stress and strain?
directly coerelated | more stress - more strain until elastic limit
31
Define ultimate stress
highest stress (force/area)
32
Define elastc modulus
Stiffness
33
Define plastic deformation
when a sufficient load is applied, it will cause the material to change shape but revert to the original shape
34
Define elastic deformation
when a sufficient load is applied,it will cause the material to change shape
35
Define total deformation
plastic and elastic deformation
36
Define stiff brittle
high stress and does not change length
37
Define stiff ductile
high stress and changes length
38
Define flexible ductile
low stress drastically changes the length
39
Define resilience
measures the energy absorbed by the material before deformation
40
Define toughness
measures the energy absorbed by a material before failure or fracture
41
What are mechanical events dependent on?
time and temperature
42
Do impressions removed fast have higher or lower deformation?
Lower
43
What is hardness a relative measure of?
Plastic deformation
44
Define fracture toughness
measures the resistance to crack propagation
45
What happens to mechanical properties over time?
the properties degrade, cracks & non-difficult defects accumulate, water is absorbed
46
Define creep
deformation over time in response to low constant stress
47
What happens after many cycles of low stress?
fatigue or small amounts of deformation accumulate until failure occur at low stress
48
True or false, the larger the number of cycles the less stress that can be applied before failure
True
49
What class of lever is chewing?
Class 3, | Fulcrum , effort, load
50
What is normal biting forces?
35-125 lbs or 150-550 N
51
What kind of forces are teeth subjected to when chewing?
strain through subclinical movements
52
What kind of forces lead to heavy wear on teeth?
abfractions or mechanical tooth loss that is not caused by decay and is often found along the gum line
53
What leads to microfractures of enamel rods?
cyclic tension and compression
54
Define microfracture
enamel loss due to mechanical or chemical forces
55
How is stress transferred in a tooth?
The stress causes formation in enamel, which is transferred to dentin via DEJ
56
Do preps weaken the tooth structure?
Yes, it takes a smaller load to break or reach critical strain
57
Define single cycle overload
single event that is very sudden that causes breakage
58
Rank the materials that can handle the most stress to least before breaking
CVC>composite>amalgam
59
True or false, the composite interface should be continuous and strong?
True

Dental Materials (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions