We classified biomaterials from their components as follows: 1. Living materials : biomaterials which are living. 2. Dead materials : biomaterials which not living. 1) Materials derived from a living body. 2) Artificial materials (metal, ceremics and organic high molecular materials.) 3. Hybrid materials : biomaterials combined with living materials and dead materials. An outline of actual biomaterials used on and in the jaw bone were described according to the above classification.