<prompt> All of the following can be used for sterilization of hand piece except:AutoclaveChemical vapour sterilizationETOXDry heat sterilization  <response>: Autoclave sterilization of hand pieces is one of the most rapid methods of sterilization. However, fibre optics dim with repeated heat sterilization in several months to a year, apparently owing to oil residue and debris baked on the ends of the optical fibres.Chemical vapour sterilization is recommended for some types of hand pieces- apparently works well with ceramic -bearing hand pieces.ETOX ethylene oxide gas is the greatest method of sterilization used for hand pieces.Dry heat sterilization of hand pieces is generally not recommended. 