title: Dento-skeletal effects of mixed palatal expansion evaluated by postero-anterior cephalometric analysis.
abstract: OBJECTIVE
  The aim of this study was to evaluate the dento-skeletal effects of mixed palatal expansion (MPE) on growing patients with a uni- or bilateral posterior crossbite and mild-to-moderate crowding as compared to untreated growing individuals using postero- anterior (PA) cephalometric analysis.
  
  
  METHODS
  A group of 24 patients (18 girls and 6 boys) treated with a Hyrax- type device was compared to an untreated matched control group at T0 (8.6 yrs ± 2.01) and T1 (10 yrs ± 2.00) using PA cephalograms. The cephalometric analysis included eight bilateral skeletal and dental landmarks. The groups were compared using independent sample t-test to estimate dento-skeletal effects on PA cephalograms.
  
  
  RESULTS
  The treated group showed significant changes for the maxillary width (P<0.001) and upper molar width (P<0.001) when compared to those of the control group.
  
  
  CONCLUSIONS
  MPE may effectively increase transverse dimensions and correct posterior crossbites.
authors.affiliation: Department of Orthodontics, Second University of Naples, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Grassia
authors.affiliation: Department of Orthodontics, Second University of Naples, Italy.
authors.forename: F
authors.initials: F
authors.lastname: D'Apuzzo
authors.affiliation: Department of Orthodontics, Second University of Naples, Italy.
authors.forename: V E
authors.initials: VE
authors.lastname: Ferrulli
authors.affiliation: Department of Orthodontics, University of Messina, Messina, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Matarese
authors.affiliation: Department of Orthodontics, Second University of Naples, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Femiano
authors.affiliation: Department of Orthodontics, Second University of Naples, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Perillo
mesh_terms: D059925:Anatomic Landmarks / Q000473:pathology; D016022:Case-Control Studies; D002508:Cephalometry / Q000379:methods*; D002648:Child; D003724:Dental Arch / Q000473:pathology; D005147:Facial Bones / Q000473:pathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D008445:Maxillofacial Development / Q000502:physiology; D008963:Molar / Q000473:pathology; D009295:Nasal Bone / Q000473:pathology; D009915:Orbit / Q000473:pathology; D016382:Orthodontic Appliance Design; D010155:Palatal Expansion Technique / Q000295:instrumentation; D012189:Retrospective Studies; D014070:Tooth / Q000473:pathology*