Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

IODC - IRS > Compound Systems > Flashcards

Compound Systems Flashcards

1
Q

What is a compound system?

A

Making materials work with each other

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

What are the tooth properties?

A

Enamel - hard to withstand mastication but brittle
Dentine - able to withstand loading - soft
PDL - proprioception

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

What are the difference of enamel and dentine for elastic modulus, fracture strength and compressive strength

A

Elastic modulus: e- 85GPa, d- 15GPa
Fracture s: e- 10MPa, d- 10Mpa
Compressive s: e- 400MPa, d- 300Mpa

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

What to think about when restoring compound structures?

A 
Structure
Form and colour 
Resist functional forces
Resist wear/ degradation
Resist static and dynamic force
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the 3 aims when restoring compound structure of tooth?

A
  1. Using compound system w/ components with desirable properties
  2. Careful bio-mechanical design consideration
  3. Using effective and reliable adhesive interface assembly
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are relevant properties of restorative materials?

A 
Elastic modulus
Compressive strength 
Flexural strength
Fracture toughness
Coefficient thermal expansion
Hydroscopic expansion
Wear behaviour 
Fatigue behaviour

CCHEFFF W

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

What is coefficient of thermal expansion?

A

Tooth - expansion = 10ppm degree celciuis
Composite - expansion = 50ppm degree celsius
Lead to fatigue

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

What are properties of fillers used in composite?

A 
Structure alters the properties and behaviour of material
Reduce polymerisation shrinkage
Limit fracture propagation
Increase wear resistance
Improve optical properties
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How to join materials in compound systems?

A

Specific adhesion - glass ionomer to dentine
Micro-mechanical adhesion - scotch bond to etched dentine
Mechanical interlocking

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

What are useful interactions between materials?

A

Complementary properties
Mechanical protection
Adhesion

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

What are unwanted interactions?

A

Electromechanical corrosion
Mismatched thermal expansion
Unstable dimensional form

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

What is ideal properties for dentine replacement?

A 
Low elastic modulus
Adhesive
Resilient to absorb shock
F- releasing
Resistant to degradation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is ideal properties for enamel replacement?

A 
High elastic modulus
Tooth-coloured
Reliable bonding
Abrasion matched to enamel
Resistant mechanical fatigue
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Difference between block, shell and lamina form?

A

Block - inlay/ restoration - on load will fracture
Shell - crown - on load may deform
Laminate - veneer- can crack or deform depending on material

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

IODC - IRS (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions