Final answer:
The rotary-type disk in a rubber dam punch is the part that creates holes in a rubber dam. It allows the user to select the needed hole size to accommodate a tooth during dental procedures, which helps in maintaining proper isolation and avoiding contamination.
Step-by-step explanation:
The rubber dam punch is a dental tool used in procedures where a dental rubber dam is applied for isolation of teeth during treatment. The part of the rubber dam punch that is a rotary-type disk is the part used to create holes of various sizes in the rubber dam material. This disk often has different sized tapered holes which, when rotated in place, allow the user to align the selected hole size with the punching mechanism. By squeezing the tool's handles together, the sharp edge of the chosen hole punches through the rubber dam, creating an opening for the tooth to pass through.
The design of this rotating disk is critical because it provides the versatility of the tool, enabling the dentist or dental assistant to select the appropriate size hole needed for the procedure quickly and efficiently. This function is an important aspect of maintaining proper tooth isolation and avoiding contamination during dental treatments.