title: "Modified Oblique Le Fort III Osteotomy" New Concepts.
abstract: BACKGROUND
  The purpose of this study is to demonstrate the surgical technique for the correction of midfacial deformities; vertical excess and posteroanterior hypoplasia. This situation obligates the need to move the whole osseous structure in an oblique posteroanterior movement that should correct both midfacial deformities. This should also correct the lip incompetence while improving the malar projection on a profile view of the patient. We also present a mathematical formula that gives the angulation needed for moving the midface complex in a simultaneous vertical and posteroanterior direction. Once given the correct angulation for the desired oblique movement, the surgeon can reproduce this angulation with custom made surgical guides over the stereolithographic model, that can then be used during surgery to achieve the desired movement accurately. This technique exemplified on this paper will give maxillofacial surgeons a new and affordable tool for the correction of midfacial deformities in an accurate and easily reproducible manner and amplifying the surgical repertoire.
  
  
  METHODS
  Patients seen in the specialty hospital "Dr. Bernardo Sepulveda" National Medical Center XXI Century, IMSS, during the period from February 2013 to November 2014 with Modified Oblique Le Fort III osteotomies, with the application of two trigonometric formulas for the accuracy of the technique.
  
  
  CONCLUSIONS
  The application of the formulas give accurate results as well as the enlargement of the upper airway and esthetic results.
authors.affiliation: Maxillofacial Surgery Service, Specialty Hospital, National Medical Center XXI Century, IMSS, Avenida Cuahtemoc, #330, Colonia Doctores, Mexico, Distrito Federal Mexico.
authors.forename: J M
authors.initials: JM
authors.lastname: García Y Sánchez
authors.affiliation: Maxillofacial Surgery Service, Specialty Hospital, National Medical Center XXI Century, IMSS, Avenida Cuahtemoc, #330, Colonia Doctores, Mexico, Distrito Federal Mexico.
authors.forename: J
authors.initials: J
authors.lastname: Romero Flores
authors.affiliation: Maxillofacial Surgery Service, Specialty Hospital, National Medical Center XXI Century, IMSS, Avenida Cuahtemoc, #330, Colonia Doctores, Mexico, Distrito Federal Mexico.
authors.forename: C L
authors.initials: CL
authors.lastname: Gómez Rodríguez
authors.affiliation: Maxillofacial Surgery Service, Specialty Hospital, National Medical Center XXI Century, IMSS, Avenida Cuahtemoc, #330, Colonia Doctores, Mexico, Distrito Federal Mexico.
authors.forename: G
authors.initials: G
authors.lastname: Pacheco Rubio
authors.affiliation: Maxillofacial Surgery Service, Specialty Hospital, National Medical Center XXI Century, IMSS, Avenida Cuahtemoc, #330, Colonia Doctores, Mexico, Distrito Federal Mexico.
authors.forename: D
authors.initials: D
authors.lastname: Rosales Díaz Mirón
authors.affiliation: Maxillofacial Surgery Service, Specialty Hospital, National Medical Center XXI Century, IMSS, Avenida Cuahtemoc, #330, Colonia Doctores, Mexico, Distrito Federal Mexico.
authors.forename: A
authors.initials: A
authors.lastname: Hernández Miranda
keywords: Formula; Le Fort III; Oblique modified; Stereolithographic model; Surgical guides