Composites are not a common type of biomaterial. Metals, ceramics, and polymers are the most common types of biomaterials.

Surface modification techniques are used to improve biocompatibility, enhance mechanical properties, and increase corrosion resistance of biomaterials.

Sol-gel coating is a common surface modification technique used to improve biocompatibility by creating a bioactive surface.

The main advantage of using a composite biomaterial is improved strength and toughness.

Contact lenses are not a common application of biomaterials. Orthopedic implants, dental implants, and cardiac stents are common applications of biomaterials.

The main challenge in developing new biomaterials is finding materials that are biocompatible, developing materials with the desired mechanical properties, and ensuring that the materials are safe and effective.

Hydroxyapatite, zirconia, and alumina are all common types of ceramic biomaterials.

The main advantage of using a metal biomaterial is high strength and toughness.

Polyethylene, polypropylene, and polystyrene are all common types of polymer biomaterials.

The main advantage of using a surface modification technique to enhance the mechanical properties of a biomaterial is improved strength and toughness.

Sol-gel coating is not a common type of surface modification technique used to increase corrosion resistance. Anodization, electroless plating, and thermal spraying are common techniques used to increase corrosion resistance.

The main challenge in using a composite biomaterial is difficulty in manufacturing.

Reducing cost is not a common application of surface modification techniques in biomaterials. Improving biocompatibility, enhancing mechanical properties, and increasing corrosion resistance are common applications of surface modification techniques.

The main advantage of using a ceramic biomaterial is good corrosion resistance.

Anodization is not a common type of surface modification technique used to improve biocompatibility. Plasma treatment, ion implantation, and chemical etching are common techniques used to improve biocompatibility.