title: Resistance and Stress Finite Element Analysis of Different Types of Fixation for Mandibular Orthognathic Surgery.
abstract: The aim of this study was to evaluate the stress and dislodgement resistance by finite element analysis of different types of fixation in mandibular orthognathic surgery. A 3D solid finite element model of a hemi-mandible was obtained. A bilateral sagittal split osteotomy was simulated and the distal segment was advanced 5 mm forward. After the adjustment and superimposing of segments, 9 different types of osteosynthesis with 2.0 miniplates and screws were simulated: A, one 4-hole conventional straight miniplate; B, one 4-hole locking straight miniplate; C, one 4-hole conventional miniplate and one bicortical screw; D, one 4-hole locking miniplate and 1 bicortical screws; E, one 6-hole conventional straight miniplate; F, one 6-hole locking miniplate; G, two 4-hole conventional straight miniplates; H, two 4-hole locking straight miniplates; and I, 3 bicortical screws in an inverted-L pattern. In each model, forces simulating the masticatory muscles were applied. The values of stress in the plates and screws were checked. The dislodgement resistance was checked at the proximal segment since the distal segment was stable because of the screen at the occlusal tooth. The regions with the lowest and highest displacement were measured. The offset between the osteotomized segments was verified by millimeter intervals. Inverted-L with bicortical screws was the model that had the lowest dislodgment and the model with the lowest tension was the one with two conventional plates. The results suggest that the tension was better distributed in the locking miniplates, but the locking screws presented higher concentration of tension.
authors.affiliation: Graduate Program in Dentistry, UFPR - Universidade Federal do Paraná, Curitiba, PR, Brazil, Universidade Federal do Paraná, Graduate Program in Dentistry, Universidade Federal do Paraná, Curitiba PR , Brazil.
authors.forename: Diego José
authors.initials: DJ
authors.lastname: Stringhini
authors.affiliation: Graduate Program in Dentistry, UFPR - Universidade Federal do Paraná, Curitiba, PR, Brazil, Universidade Federal do Paraná, Graduate Program in Dentistry, Universidade Federal do Paraná, Curitiba PR , Brazil.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Sommerfeld
authors.affiliation: Graduate Program in Dentistry, UP - Universidade Positivo, Curitiba, PR, Brazil, Universidade Positivo, Graduate Program in Dentistry, Universidade Positivo, Curitiba PR , Brazil.
authors.forename: Lucas Caetano
authors.initials: LC
authors.lastname: Uetanabaro
authors.affiliation: Graduate Program in Dentistry, UP - Universidade Positivo, Curitiba, PR, Brazil, Universidade Positivo, Graduate Program in Dentistry, Universidade Positivo, Curitiba PR , Brazil.
authors.forename: Denise Piotto
authors.initials: DP
authors.lastname: Leonardi
authors.affiliation: Graduate Program in Dentistry, UP - Universidade Positivo, Curitiba, PR, Brazil, Universidade Positivo, Graduate Program in Dentistry, Universidade Positivo, Curitiba PR , Brazil.
authors.forename: Melissa Rodrigues
authors.initials: MR
authors.lastname: Araújo
authors.affiliation: Graduate Program in Dentistry, UFPR - Universidade Federal do Paraná, Curitiba, PR, Brazil, Universidade Federal do Paraná, Graduate Program in Dentistry, Universidade Federal do Paraná, Curitiba PR , Brazil.
authors.forename: Nelson Luís Barbosa
authors.initials: NL
authors.lastname: Rebellato
authors.affiliation: Graduate Program in Dentistry, UFPR - Universidade Federal do Paraná, Curitiba, PR, Brazil, Universidade Federal do Paraná, Graduate Program in Dentistry, Universidade Federal do Paraná, Curitiba PR , Brazil.
authors.forename: Delson João da
authors.initials: DJ
authors.lastname: Costa
authors.affiliation: Graduate Program in Dentistry, UP - Universidade Positivo, Curitiba, PR, Brazil, Universidade Positivo, Graduate Program in Dentistry, Universidade Positivo, Curitiba PR , Brazil.
authors.forename: Rafaela
authors.initials: R
authors.lastname: Scariot
mesh_terms: D001732:Bite Force; D001860:Bone Plates; D001863:Bone Screws; D020342:Finite Element Analysis; D006801:Humans; D008334:Mandible / Q000601:surgery*; D057909:Orthognathic Surgery