title: Stress analysis of different configurations of 3 implants to support a fixed prosthesis in an edentulous jaw.
abstract: This study's aim was to evaluate the stress distribution in a mandibular implant-supported prosthesis and peri-implant bone considering implant quantity, diameter and position using linear 3-D finite element analysis. Models of an anterior jaw comprised 4 groups according to implant quantity, diameter, and position: control group C, 5 regular implants; R, 3 regular implants; W, 3 wide implants; and DTR, 3 regular implants with the distal ones tilted 30° distally. The cantilever was loaded with an axial load of 50 N. Data was evaluated using von Mises stress on implants and maximum principal stress and microstrain on the bone. The W group showed the lowest value of maximum principal stress in peri-implant bone of the loaded side (4.64 MPa) when compared to C (5.27 MPa), DTR (5.94 MPa), and R (11.12 MPa). Lower stress values in the loaded implants were observed in the experimental groups when compared to the C group. However, the unloaded implants presented opposite results. All the screws of the W group presented lower stress values when compared to the C group. However, the R and DTR groups presented an increase in stress values with the exception of the loaded screw. A reduction in the number of implants associated with wider implants reduced the stress in the bone and prosthetic components.
authors.forename: João Paulo da
authors.initials: JP
authors.lastname: Silva-Neto
authors.forename: Marcele Jardim
authors.initials: MJ
authors.lastname: Pimentel
authors.forename: Flávio Domingues das
authors.initials: FD
authors.lastname: Neves
authors.forename: Rafael Leonardo Xediek
authors.initials: RL
authors.lastname: Consani
authors.forename: Mateus Bertolini Fernandes dos
authors.initials: MB
authors.lastname: Santos
mesh_terms: D001863:Bone Screws; D000044:Dental Abutments; D017267:Dental Prosthesis Design / Q000379:methods*; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods*; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D007575:Jaw, Edentulous / Q000534:rehabilitation*; D008488:Medical Illustration; D008953:Models, Anatomic; D012016:Reference Values; D015203:Reproducibility of Results