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Dental Assistant Test Study Guide 1. 20 primary teeth are present once all primary teeth have erupted. 2. Distilled water is the only kind of water that can be used in the autoclave. 3. No handpieces or cavitron tips ever go into the ultrasonic. 4. A tooth is to be etched for 20 seconds prior to the placement of a compositerestoration. 5. The statim cassette is to be cleaned weekly.
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