Definitions

Austenite:

The high-temperature (parent) phase of material

Biocompatibility:

The ability of a material to perform with an appropriate host response in a specific application.

Biomaterial:

A material intended to interface with biological systems to evaluate, treat, augment or replace any tissue, organ or function of the body.

Biomaterials science:

The study and knowledge of the interactions between living and non-living materials.

Bone bonding:

The establishment, by physicochemical process, of continuity between implant and bone matrix.

Hysteresis:

The difference between the temperatures at which the material is 50% transformed to austenite upon heating and 50% transformed to martensite upon cooling.

Implant:

A medical device made from one or more biomaterials that is intentionally placed within the body, either totally or partially buried beneath an epithelial surface.

Martensite:

Low temperature phase of material

Martensitic transformation:

A lattice transformation involving shearing deformation and resulting from cooperative atomic movement.

Osseointegration (or osteointegration):

Direct bone-to-biomaterial interface without fibrous tissue for a functioning implant at the optical microscopy limits of resolution (0,5 µM). It is a description of clinical performance devices and is not applicable to the description of biomaterial interactions.

Osteoconduction:

The ability to guide bone formation on material surface in a bony environment.

Osteoinduction:

The ability to induce bone formation in non-osseous tissues.

Superelasticity (pseudoelasticity):

The ability of an alloy specimen to return to its original shape upon unloading after a substantial deformation.

Shape memory effect:

When an alloy in which some fixed shape has been stored is deformed at low temperatures and then subsequently heated above the transition temperature, it reverts to its original shape.

Shape memory alloy:

Material with an ability to return to some previously defined shape or size when subjected to an appropriate thermal procedure.

Transition temperature:

Temperatures at which changes of material phases occur