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Dental Materials > Biomechanics > Flashcards

Flashcards in Biomechanics Deck (59)
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1

What are the goals of dental materials

longevity, function properly, aesthetics, patient satisfaction

2

Model of dental materials

similar to tooth structure, properties, and composition

3

What are the limitations of dental materials?

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

4

Define measure (surface properties)

contact angle used to measure how liquid interacts w/ solid

5

Define good wetting

low contact angle

6

Define poor wetting

high contact angle

7

What are some clinical consequences of surface properties?

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

8

What makes sealants

a slowable resin with NO filler that is clear

9

Is HEMA hydrophobic or hydrophilic?

possesses both

10

What is an advantage of hydroPHILIC primers?

low viscosity and allows for attachment to composite

11

Is tooth structure (dentin) hydrophobic or hydrophilic

hydrophobic

12

Where is surface wetting important?

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

13

What does primary bonding affect?

chemical and electrochemical reactions

14

What does secondary bonding affect?

adsorption (onto) and absorption (into)

15

How are metals affected?

corrosion or spontaneous destructive oxidation

16

what metal do not corrode?

gold, platinum, titanum and palladium

17

Define active corrosion

leads to destruction via gamma 2

18

Define passive corrosion

production od corrive film that prevents further corrosion

19

Define immune corrosion

noble metals (full valence octet)

20

What are the components of electrochemical corrosion?

anode, cathode, circuit, and electrolights in solution

21

What is an anode?

corroded metal

22

What is a cathode

a passive supplier of electrons to solution

23

What are the four types of corrosion?

glavanic, structural selective, cervice (crack), stress

24

Define chemical dissolution

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