Final answer:
A dermabrader is the tool used in mechanical dermabrasion to physically remove tissue down to the dermis, which also helps in reducing microbial load on skin.
Step-by-step explanation:
The tool used to physically remove tissue down to the dermis during mechanical dermabrasion is a dermabrader. This device utilizes abrasive materials such as diamond particles or wire brushes to remove layers of skin, effectively treating scars, wrinkles, and altered pigmentation. The procedure not only removes the upper layers of the epidermis but also reduces microbial load on skin or tissue through mechanical means. While chemical peels might use mild chemicals to achieve a similar effect, mechanical dermabrasion relies on the physical removal of skin cells.