All-on-4 is a cost-efficient dental implant solution that offers a fixed full-arch prosthesis on the day of surgery.
All-on-4 Dental Implants purely means that a full arch of artificial teeth is supported by 4 dental implants only. Typically the back implants in the upper and lower jaw are placed tilted in order to get bone anchorage and avoid anatomical structures. The term All-on-4 also comprises that the inserted implants are immediately (within 24 hours) loaded with a fixed arch of teeth.
Traditionally, more than four implants were placed to support a full arch of artificial teeth! The implants were of course placed straight and parallel in conformity with preexistent teeth and definitely not angulated on purpose. Also, a healing time of several months was adhered to before these implants were loaded with the arch of artificial teeth!