Case Study#4   1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17   Orbital Implants Used for over 100 years Initially: spheres of gold or glass Replaced by silicone or plastic materials (polymethylmethacrylate) Complications: exposure, extrusion, migration, infection, poor motility, poor cosmesis Hydroxyapatite Orbital Implant Hydroxyapatite of marine coral almost identical to mineral matrix of cancellous bone Advantages Light weight Porous Biocompatible (not 100%) Natural movement