title: Three-Dimensional Analysis of Long-Term Stability After Bilateral Sagittal Split Ramus Osteotomy Fixed With a Single Miniplate With 4 Monocortical Screws and 1 Bicortical Screw: A Retrospective 2-Center Study.
abstract: OBJECTIVE
  This study evaluated the long-term stability of bilateral sagittal split ramus osteotomy fixed with a single miniplate with 4 monocortical screws and 1 bicortical screw (hybrid technique [HT]) using 3-dimensional (3D) analysis and an objective measuring tool, cone-beam computed tomography (CBCT).
  
  
  METHODS
  Sixty-four patients who underwent bimaxillary surgery with mandibular advancement fixed with the HT were selected from 2 different institutions and enrolled in this retrospective study. All patients underwent CBCT preoperatively, 1 month after surgery, and 12 months after surgery. To estimate the long-term stability of the HT, volumetric comparisons were performed using the following measurements: distance between the gonion and the B point in the sagittal plane; distance between the right and left gonion transversally; and the angle of the line connecting the mandibular notch and the gonion and the line connecting the gonion and the B point vertically.
  
  
  RESULTS
  Statistical analysis showed no relevant relapse (<1 mm or <1°) when using the HT. However, a positive correlation between the amount of advancement and the amount of postoperative relapse was observed.
  
  
  CONCLUSIONS
  The HT produces stable postoperative 3D results after 12 months.
authors.affiliation: Chief, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona; Professor and Department Head, Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain.
authors.forename: Federico
authors.initials: F
authors.lastname: Hernández-Alfaro
authors.affiliation: Chief, Face Surgery Center, Parma; Professor and Department Head, Department of Maxillofacial Surgery, Università degli Studi di Firenze, Firenze, Italy.
authors.forename: Mirco
authors.initials: M
authors.lastname: Raffaini
authors.affiliation: DDS Fellow, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona, Spain.
authors.forename: Ariane
authors.initials: A
authors.lastname: Paredes-de-Sousa-Gil
authors.affiliation: Attending Surgeon, Face Surgery Center, Parma, Italy.
authors.forename: Alice Sara
authors.initials: AS
authors.lastname: Magri
authors.affiliation: Attending Surgeon, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona; Associate Professor, Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain.
authors.forename: Raquel
authors.initials: R
authors.lastname: Guijarro-Martínez
authors.affiliation: Attending Surgeon, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona; Associate Professor, Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain. Electronic address: avalls@institutomaxilofacial.com.
authors.forename: Adaia
authors.initials: A
authors.lastname: Valls-Ontañón
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001860:Bone Plates; D001863:Bone Screws; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D059229:Osteotomy, Sagittal Split Ramus / Q000295:instrumentation*; D011474:Prosthesis Design; D012189:Retrospective Studies; D013997:Time Factors; D055815:Young Adult