Final answer:
Full-thickness burns, which are fourth-degree burns, involve complete destruction of the skin including the epidermis, dermis, muscle, and bone, and often require medical procedures such as debridement or grafting for healing.
Step-by-step explanation:
Full-thickness burns refer to fourth-degree burns which involve the complete destruction of the skin, extending past the epidermis and dermis into the underlying muscle and bone. These burns are so severe that they damage the nerve endings as well, often leading to a lack of pain because the nerve endings are destroyed. To treat full-thickness burns, medical intervention is necessary, involving procedures such as debridement (excision of damaged tissue) or amputation in extreme cases. Healing requires grafting skin from an unaffected part of the body, or using skin grown in tissue culture for grafting purposes.