Medical or dental cassette

A dental cassette, comprising:

• a tray that comprises a plurality of walls extending from a panel to define a reception space for receiving at least one dental instrument;
• another tray;
• a locking mechanism that includes a lock pin, and a resilient body coupled to the lock pin to urge the lock pin toward a lock position, wherein the lock pin is configured to lock a lock catch, wherein the lock catch is attached to the another tray, wherein the lock pin has a first section and a second section, the first section of the lock pin having a diameter smaller than the second section of the lock pin, wherein the lock catch is a body having a cutout that has a first section that is wider than the first section of the lock pin but narrower than the second section of the lock pin, wherein the cutout has a second section that is wide enough to receive the second section of the lock pin, and wherein, in a locked state, the second section of the lock pin is in the second section of the cutout, and in a released state, the second section is outside the second section of the cutout to permit the first section of the lock pin to pass through the first section of the cutout;
• at least one push pin that abuts the lock catch, the push pin is connected to another resilient body that is compressed by the push pin in the locked state, whereby the lock catch is pushed away by the push pin in the released state as the another resilient body decompresses;
• and
• a push button connected to the lock pin, wherein applying a force sufficient to compress the resilient body moves the lock pin from the locked state to the released state.