Purpose: The objective of this study was to analyse stress distribution in craniofacial structures around of 2 concepts of rehabilitation using All-on-Four with zygomatic implants.

Materials and methods: Two photoelastic resin skulls replicas, each with four implants stimulating the All-on-Four configuration, were prepared. Two models used concept All-on-Four with zygomatic implants. Were performed using variations of 1 zygomatic implants in each one zygomatic bone in combination with 2 standard implants in the anterior maxilla and another group with only four zygomatic implants (Models 1 and 2, respectively). The four implants were splinted by means of a cast metal bar. The skullsreplicas of photoelastic resin were subjected to photoelastic analysis after linear loading using an Instron 4411 servohydraulic mechanical testing unit with a 2-mm displacement. The fringe patterns produced in the photoelastic resin for each implant and load were photographed with a digital camera.

Results: The results showed the stress distribution in the photoelastic analysis, the fringes were concentrated body and frontal process of zygomatic bone.

Conclusions: Thus, under the conditions tested, both models showed satisfactory biomechanical behavior.

Conflict of interest : None declared.