A voice recognition system includes a microphone for receiving speech from a user and processing electronics. The coolant tank is arranged adjacent to the radiator in a horizontal direction when the apparatus disposed statically. A first polymeric shell appliance is formed over the first tooth arrangement model or a copy thereof. The necessary memory required for randomly accessing data contained in files using the expanded physical object table may be reduced by distributing necessary information within a header of a file to simplify the structure of the physical object table.