title: Bone density of the midpalatal suture 7 months after surgically assisted rapid palatal expansion in adults.
abstract: BACKGROUND
  The aims of this study were to analyze changes in bone density of the midpalatal suture after surgically assisted rapid palatal expansion (SARPE) with the bone-borne Dresden Distractor (DD; ITU, Dresden, Germany) via computed tomography (CT) and to compare of preoperative surgical findings with a control group.
  
  
  METHODS
  Sixteen adult patients (mean age 24.5 years) underwent axial CT scans before and 7 months after SARPE. CT image fusion was performed for the midpalatal suture bone. Sixty-six controls (mean age 25.7 years) served for comparing age-related bone density. Bone structure and density were assessed in the coronal plane at the anterior, median, and posterior levels.
  
  
  RESULTS
  Highest density was found in the posterior part (1046 Hounsfield units [HU]) before expansion. Seven months after SARPE, bone density was 48% (anterior), 53% (median), and 75% (posterior) compared with preoperative values. The control group showed fairly equal Hounsfield units (889 HU to 900 HU) in all parts.
  
  
  CONCLUSIONS
  Seven months after SARPE, the midpalatal suture's density achieves just one half to three quarters of the pretreatment values. To maintain the resistance against forces from the unsplit posterior part, the retention time should be lengthened.
authors: Department of Orthodontics, Technical University, Dresden, Germany.
authors: Silvia
authors: S
authors: Petrick
authors: Thorsten
authors: T
authors: Hothan
authors: Volker
authors: V
authors: Hietschold
authors: Matthias
authors: M
authors: Schneider
authors: Winfried
authors: W
authors: Harzer
authors: Eve
authors: E
authors: Tausche
mesh_terms: D000293:Adolescent; D000328:Adult; D015519:Bone Density; D016022:Case-Control Studies; D003393:Cranial Sutures / Q000000981:diagnostic imaging / Q000473:pathology; D003799:Dental Stress Analysis; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D056948:Orthognathic Surgical Procedures; D019857:Osteogenesis, Distraction; D010155:Palatal Expansion Technique; D021362:Palate, Hard / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery*; D011446:Prospective Studies; D015203:Reproducibility of Results; D055502:Secondary Prevention; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed; D055815:Young Adult