A Cavitron can be purchased from a few places. The easiest way would be to approach a dental supplies specialist. They are also available on the Amazon site.
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The main parts of a microwave oven include the magnetron (which generates microwaves), the cooking chamber (where food is placed), the control panel (for setting cooking times and power levels), the door with a mesh screen (to contain microwaves), and the turntable (to ensure even cooking).