The goal of a more natural appearance was finally achieved with the help of a natural material: ocean coral. A remarkable similarity was noticed between the porous structure of certain coral species and that of human bone. 

Soon after this discovery, a method was developed to transform the mineral in coral to match that of human bone, known as hydroxyapatite. 

This new, naturally derived material has both the porous structure and the chemical structure of bone. Thus, the tissues of the body will accept-even grow-into these naturally derived hydroxyapatite implants, and essentially become a "living" part of the body.

           
 Hydroxyapatite                         Human Bone