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. 2017 Nov 5;39(1):33. doi: 10.1186/s40902-017-0132-2

Fig. 1.

Fig. 1

The all-on-4 concept for complete edentulism. It is a concept that rehabilitates the complete edentulism using four implants. The anterior implants are placed vertically and the posterior implants are tilted to avoid anatomical structures such as the maxillary sinus