Surgical apparatus and instruments for dental use; dental apparatus and instruments, namely, dental implants and dental prostheses and accessories therefor, the aforesaid accessories being in the nature of dental clips for securing pre-existing dentures, abutment screws, dental screwdrivers; dental implant systems comprised of dental implants, dental prostheses, abutments, artificial teeth, pins for artificial teeth; pins for artificial teeth; dentures and components therefor; dental implants of synthetic materials, namely, dental abutments; implant abutments; artificial teeth; suture materials for dental use