Occurring when a wound is closed within a fewhours of its creation. Wound edges are surgically or mechanicallyapproximated, and collagen metabolism provides long-term strength. Occurs when a poorly delineated woundis left open to protect against wound infection. The open wound allowsfor the natural host defense to debride the wound before closure. Occurs when an open full thickness wound isallowed to close by wound contraction and epithelialization. Thickness Wounds – Occurs when a partial-thickness wound is closed primarily by epithelialization. This woundhealing involves the superficial portion of the dermis. There is minimalcollagen deposition, and an absence of wound contraction.
Whether wounds are closed by primary intention, subjectto delayed primary closure or left to heal by secondaryintention1, the wound healing process is a dynamic one whichcan be divided into three phases. It is critical to rememberthat wound healing is not linear and often wounds canprogress both forwards and back through the phasesdepending uponintrinsic and extrinsic forces at work withinthe patient
Two types of factor influence the wound healing :A. Local feature :1. infection.2. Poor blood supply.3. Movement.4. Foreign body.5. Exposure to ultraviolet ray.6. Types , size and local of injury.
Systemic feature: Age. Infection. Nutrition :arginine and vita A. Hypoxia. Anemia. Hypo perfusion. Metabolic disorder : D.M. And uremia . Steroid and radiation.