Which is not considered a scaffold fabrication technique?

The correct answer is concrete molding, as it is not traditionally used as a scaffold fabrication technique in the context of tissue engineering. In tissue engineering, scaffolds are typically created using methods that enhance their suitability for biological applications, such as serving as temporary structures that support cell attachment, growth, and tissue formation.

Scaffold fabrication techniques like gas foaming, fiber mesh, and melt molding are specifically designed to create biocompatible structures that can mimic the extracellular matrix and allow for cell migration and nutrient exchange.

Gas foaming utilizes gas to create pores within materials, which is essential for creating a three-dimensional structure that can support cellular functions. Fiber mesh involves the arrangement of polymer fibers into a mesh structure that can be used as a scaffold, promoting good mechanical properties and biocompatibility. Melt molding is another common technique that involves melting a polymer to form a desired scaffold shape, allowing for control over the scaffold's porosity and surface characteristics.

Concrete molding, on the other hand, is associated with construction and does not fit the biological compatibility criteria nor is it relevant to scaffold applications in a tissue engineering context. Thus, it is categorized separately from the recognized methods of scaffold fabrication used to support living tissues.