Final answer:
To remove excess cement in dentistry, a knot in dental floss can be used so the floss doesn't catch on the edges of dental work while cleaning interdental areas.
Step-by-step explanation:
When removing excess cement after a dental procedure such as crown placement, a knot in dental floss may be used. This technique helps ensure that the floss does not catch and pull on the edges of the newly placed dental work while still being able to clear away any residual cement from the interdental areas. It is important to be gentle and patient during this process to avoid damaging the dental work or the gums.