1. Primary Intention: This is the most ideal type of healing. It occurs when the wound edges are approximated (brought together) and there is minimal tissue loss. This usually involves sutures, staples, or adhesives to hold the wound closed. Examples include clean surgical incisions and minor cuts.
2. Secondary Intention: This occurs when wounds are left open to heal. This is typical for wounds with significant tissue loss, such as deep wounds or those contaminated with infection. The wound fills in with granulation tissue from the bottom up and heals with a larger scar.
3. Tertiary Intention: This is a delayed primary closure. It involves initially leaving a wound open to allow for drainage and debridement, and then later closing it with sutures or staples. This is often used for wounds with significant contamination or infection.
4. Delayed Healing: This encompasses any wound that doesn't heal within the expected timeframe. This can be caused by various factors like infection, malnutrition, diabetes, and certain medications.
It's important to note that these are general classifications, and there can be overlap and variations depending on the specific wound.