What is it?

Anaplastology

Coming from the ancient Greek -ἀνά, ANA (again, on), -πλαστικός, PLAST (relating to the sculpting) -λογία, LOGY (science) 
It is the art and science of reconstructing the missing part of a face (facial epithesis or prosthesis) or the body (somatic prosthesis) in a realistic manner. These life-like prostheses can cover up and protect a cavity, and replace a disfigurement while blending in with the contours of the face or body. They are made with synthetic materials that are just as supple as skin, using an appropriate retention method which is adapted to each individual case:
- by anchorage to the bone (implants put in place by the surgeon so that the prosthesis can be fixed using magnets or clips)
- self-retentive prostheses (e.g. set inside a cavity)
- prostheses held by a biological adhesive (this may be a temporary solution)
- prostheses fixed to frames (this may be a temporary solution)

Anaplastology is widely used internationally for our profession

Epithesis

From the ancient Greek ἐπί, EPI (on) θἐσις, THESIS (act of placing)
An epithesis is another name for a prosthesis and covers the most superficial missing or defective parts of the body: the skin. In this way, it protects a cavity or replaces an organ. An epithesis may be either facial or somatic.
Facial epitheses include all the different parts of the face, such as:
- an ear (auricular epithesis or prosthesis)
- a nose (nasal epithesis or prosthesis)
- an eye with eyelids (orbital epithesis and prosthesis)
- an extended region of the face (hemi-facial epithesis or prosthesis) 
Somatic epitheses cover different superficial parts of the body such as:
- a breast (external mammary epithesis or prosthesis)
- a finger or toe
- a hand or foot

Epithesis is a term widely used in different European countries for a facial prosthesis, with its local differencies: episthesis, epitesis, Epithese.