Biocompatibility depends on which factor?

• A. The physical function we ask of it
• B. The material's color
• C. The price
• D. The brand

Answer: (A)

Biocompatibility depends on how a material behaves in the body under the specific function it is asked to perform. The same material can be well tolerated in one use but provoke irritation or adverse tissue response in another if the mechanical demands, exposure to saliva, thermal cycling, wear, or chemical challenges are different. The physical function defines the type and level of stresses the material must endure and the nature of any byproducts that could interact with tissues, so compatibility is context-specific rather than a fixed property.

The material’s color is about appearance and aesthetics, not how tissues react to it. Price and brand don’t influence the material–tissue interaction or the body's response; they affect market factors, not biocompatibility.