Which type of suture material is commonly used for internal closure?

Polypropylene is a synthetic suture material that is commonly used for internal closure due to its unique properties. It is non-absorbable, which means it maintains its tensile strength over time and does not require removal after healing, making it ideal for internal tissues that require ongoing support. Polypropylene is also inert and has minimal tissue reactivity, reducing the risk of inflammation or adverse reactions in the body.

This material is particularly favored in surgeries involving the gastrointestinal tract, vascular procedures, and in situations where long-term tensile strength is necessary. Its smooth surface allows for easy passage through tissues without causing excessive trauma, contributing to a lower risk of complications such as infection or dehiscence at the surgical site.

In contrast, catgut is absorbable and may not provide the same prolonged support needed for internal tissues, while silk is typically used for external suturing due to its handling properties but can induce a tissue reaction. Nylon, though non-absorbable, is less commonly used for internal closure compared to polypropylene because it does not possess the same favorable characteristics regarding tissue reactivity and ease of handling in deeper tissues.