breast implant vs mastoplasty

breast implant

noun
  • A medical prosthesis used to augment, reconstruct, or create the physical form of breasts (the organs on the front of the [typically female] chest). 

mastoplasty

noun
  • Plastic surgery of a breast to alter its shape or size. 

How often have the words breast implant and mastoplasty occurred in a corpus of books? (source: Google Ngram Viewer )