title: Evaluation of long-term stability of skeletal anterior open bite correction in adults treated with maxillary posterior segment intrusion using zygomatic miniplates.
abstract: BACKGROUND
  This study evaluated the long-term stability of maxillary molar intrusion and anterior open-bite correction in adults treated by maxillary posterior teeth intrusion with zygomatic miniplates.
  
  
  METHODS
  The sample included 26 skeletal anterior open-bite patients, who had maxillary posterior segment intrusion with zygomatic miniplates. Lateral cephalograms were taken at pretreatment, posttreatment, 1 year posttreatment, and 4 years posttreatment.
  
  
  RESULTS
  The mean maxillary molar intrusion was 3.04 mm (P ≤0.01), and the mean bite closure was 6.93 mm (P ≤0.01). The intruded maxillary molars relapsed by 10.20% in the first year after treatment and by 13.37% by 4 years after treatment. Overbite relapsed by 8.19% and 11.18% after 1 year and 4 years posttreatment, respectively. The first year after treatment accounted for 76.29% and 73.2% of the total relapses of molar intrusion and overbite, respectively. The 4-year posttreatment relapse amounts of maxillary molar intrusion and overbite were positively correlated with the amount of pretreatment maxillary molar height and the initial open-bite severity, respectively, but negatively correlated with the amounts of maxillary molar intrusion and open-bite correction gained by treatment.
  
  
  CONCLUSIONS
  Molar intrusion with zygomatic miniplates appears to be stable 4 years after treatment.
authors.affiliation: Lecturer, Faculty of Dentistry, Department of Orthodontics, Alexandria University, Alexandria, Egypt. Electronic address: eiman.marzouk@yahoo.com.
authors.forename: Eiman S
authors.initials: ES
authors.lastname: Marzouk
authors.affiliation: Lecturer, Faculty of Dentistry, Department of Orthodontics, Alexandria University, Alexandria, Egypt.
authors.forename: Hassan E
authors.initials: HE
authors.lastname: Kassem
mesh_terms: D000328:Adult; D001860:Bone Plates; D005260:Female; D006801:Humans; D008297:Male; D024343:Open Bite / Q000601:surgery*; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D013997:Time Factors; D055815:Young Adult; D015050:Zygoma / Q000601:surgery*