A Biomechanical Finite Element Analysis of All-on-Four Concept using Short Implants in Maxilla.

Despite the advantages, The All-on-four concept has the disadvantage that the bone around the posterior (tilted) implant receives the highest pressure distribution. This study analyzed various implant-supported denture designs in the maxilla developed from the All-on-four concept using short implants as an alternative to the All-on-four concept. This study uses the Finite Element Method. All implants were placed parallel to the axial axis. Design A (All-on-four) was the control design. Design B: eliminate the tilted implant in the posterior and place one 6 mm implant in each of the left and right permanent maxilla first molar regions. Design C: same as Design B but place one 6 mm implant in each of the left and right permanent maxilla second Premolar, and first Molar regions. Design D (All-on-short) same as Design C but uses short implants both anterior and posterior. Designs B, C, and D had no distal cantilever. The axial load of 80N and an oblique load of 50Nx3 were applied separately. The simulation results showed that Design C has the lowest stress and Design B has the highest stress. It can be concluded that biomechanically, short implants can be used to treat patients with complete edentulous. [ABSTRACT FROM AUTHOR]