A sterilization system attachable to an autoclave or in the form of a free-standing auxiliary unit adapted to receive cassette sterilization containers for causing a high volume of air heated to an effective drying temperature to flow into said chamber at a high air flow rate. A control effective to open a valve when the unit for supplying heated air is operating and to close the valve when the unit is not operating. A device for supporting medical or dental instruments during sterilization is also disclosed.