<prompt> Microdermasion is done with:Aluminium oxide crystalsAluminium trihydrate crystalsFerrous oxide crystalsFerric oxide crystals  <response>: Microdermabrasion is resurfacing technique with superficial skin wound achieved with aluminium oxide crystals. Ref: Textbook of dermatosurgery cosmetology, Satish S savant, E-2, P-620. 