MDI Collared O-Ball Head Analog LAOB is a collared O-ball head analog used with MDI Implants & Prosthetics. MDI Collared O-Ball Head Analog is also used along side Metal Housings, Blockout Shims, O-Ball Abutment Copings & O-Ball/Square Head Waxing Suggested Applications Used along side (MDI) Metal Housings, Blockout Shims, O-Ball Abutment Copings & O-Ball/Square Head Waxing Copings. Designed for use with prosthetic parts and components. Used for implant and prosthetic placement.