title: CBCT assessment of alveolar buccal bone level after RME.
abstract: OBJECTIVE
  To evaluate the maxillary alveolar buccal bone levels after expansion with banded and bonded expanders, using cone-beam computed tomography (CBCT).
  
  
  METHODS
  The population sample consisted of 22 patients who required expansion during their comprehensive treatment; 10 patients (five males and five females) with a mean age of 13.5 years (CVMS 3) had bonded hygienic expanders, and 12 (six males and six females) with a mean age of 12.6 years (CVMS 3) had banded hyrax expanders. CBCT was taken both before (T1) and 6 months after last activation (T2). Measurements were made for buccal bone thickness (BT), buccal marginal bone level (MBL), and bone thickness level (BTL) at the right first molar (M(Rt)), left first molar (M(Lft)), right first premolar (PM(Rt)), and left first premolar (PM(Lft)). A mixed-design analysis of variance assessed differences between and within the groups. Post hoc t-tests were completed on significant analysis of variance results to determine where differences occurred.
  
  
  RESULTS
  Analysis of variance revealed no significant differences between or within the two groups. BT significantly decreased horizontally following rapid maxillary expansion. The amount of bone lost was -0.59 mm M(Rt), -0.72 mm PM(Rt), -0.50 mm M(Lft), and -0.57 mm PM(Lft) (P < .003).
  
  
  CONCLUSIONS
  There was no significant difference between or within the two groups. Buccal bone loss in the vertical dimension (MBL) only showed significance in the banded group for M(Rt) (0.63 mm) and PM(LFt) (0.37 mm) as evidenced by the paired t-test (P < .05).
authors.affiliation: Department of Orthodontics, University of Detroit Mercy, Detroit, MI 48208, USA.
authors.forename: Valmy
authors.initials: V
authors.lastname: Pangrazio-Kulbersh
authors.forename: Brynn
authors.initials: B
authors.lastname: Jezdimir
authors.forename: Mariana
authors.initials: M
authors.lastname: de Deus Haughey
authors.forename: Richard
authors.initials: R
authors.lastname: Kulbersh
authors.forename: Paul
authors.initials: P
authors.lastname: Wine
authors.forename: Richard
authors.initials: R
authors.lastname: Kaczynski
mesh_terms: D000293:Adolescent; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology*; D000704:Analysis of Variance; D002648:Child; D054893:Cone-Beam Computed Tomography / Q000379:methods; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging*; D010155:Palatal Expansion Technique / Q000009:adverse effects* / Q000295:instrumentation; D011446:Prospective Studies