Deck 1 Flashcards
Biomaterial
used to make devices to replace/repair a function of the body in a safe, reliable, economic, and physiologically acceptable manner.
General uses
Prosthesis - cardio, ortho, ophthalmological
Interventions: sutures, adhesives, drug release
Biocompatibility
ability of a material to perform with an appropriate host response in a specific application.
Third Gen. materials
regenerate functional tissue
Second Gen. material
Bioactivity: resorbable, bone bonding, drug release
Ex. PLA, polymers
First Gen. material
Bioinertness: minimal reaction/interaction
Ex. silicone-rubber
Classes of materials
Polymers
Metals
Ceramics
Composites
Stent materials
SS, nitinol or NiTi alloy, CoCr alloy
Hip materials
Ti6Al4V, CoCr, CoCrMo, OHMWPE, ceramics
Dental materials
cpTi, metal alloys, ceramics, polymers
4 attractive forces
Gravity
Weak Nuclear
Strong Nuclear
Electromagnetic (Most important)
Electromagnetic forces
Weak are liquids and strong are solids.
Electromagnetic force types
Van der Waals Ionic Hydrogen Metallic Covalent
Metallic EM force
Attractive force between a “sea” of positively charged atoms and delocalized e-
Types of bonds
Primary v. Secondary
Primary: Covalent, Ionic, Metallic
Secondary: Van der Waals, H+, Dipole
Metallic v. Ionic magnetism
M. is positive
I. is negative
Surface properties
dictates interactions between a material and its environment
Bulk properties
internal structure, mechanical properties, thermal and optical properties
Microstructure
How atoms and molecules are arranged.
Processing types (3)
Annealing
Heating
Quenching
Young’s modulus
Slope
Ultimate tensile strength
Acceptrable permanent deformation is acceptable
UTS
Highest point
Hardness (1)
Yield strength
Stress at which noticeable plastic strain occurs
Failure is when it is exceeded
End of slope, beginning of curve
Resilience
Breaking strength
Limit of graph
