Which of the following materials is considered osteoconductive?

Osteoconductive materials are those that provide a scaffold or framework that supports bone growth and facilitates the migration of osteogenic cells into the area where bone regeneration is desired. Allograft, ceramic alloplast, and autogenous bone chips are all examples of such materials.

Allografts, which are bone grafts sourced from a donor (typically from a cadaver), provide an excellent structure for new bone growth and help in the healing process. They allow for the migration of cells and the formation of new bone over time.

Ceramic alloplasts are synthetic materials designed to mimic the properties of natural bone. They offer a stable framework that encourages the body's cells to grow into the graft and results in new bone formation.

Autogenous bone chips, taken from the patient’s own body, are also osteoconductive as they contain living cells and growth factors that enhance bone formation. They are highly effective as they create a direct biological response that aids in bone regeneration.

Since all of these materials have osteoconductive properties, they can each contribute to bone healing and regeneration, leading to the correct answer being that all of these choices are osteoconductive.