mummification

noun

mum·​mi·​fi·​ca·​tion ˌməm-i-fə-ˈkā-shən 

1

: the process of mummifying or the state of being mummified

2

: the devitalization of a tooth pulp followed by amputation of the coronal portion leaving the remainder of the devitalized tissue in the tooth canal

3

: dry gangrene