title: Cone beam computed tomography-based models versus multislice spiral computed tomography-based models for assessing condylar morphology.
abstract: OBJECTIVE
  To quantitatively compare condylar morphology using cone beam computed tomography (CBCT) and multislice spiral computed tomography (MSCT) virtual three-dimensional surface models.
  
  
  METHODS
  The sample consisted of secondary data analyses of CBCT and MSCT scans obtained for clinical purposes from 74 patients treated with condylar resection and prosthetic joint replacement. Three-dimensional surface models of 146 condyles were constructed from each scan modality. Across-subject models were approximated and voxel-based registration was performed between homologous CBCT and MSCT images, making it possible to create average CBCT- and MSCT-based condylar models. SPHARM-PDM software provided matching points on each corresponding model. ShapeAnalysisMANCOVA software assessed statistically significant differences between observers and imaging modalities. One-sample t-tests evaluated the null hypothesis that the mean differences between each CBCT- and MSCT-based model were not clinically significant (<.5 mm). Tests were conducted at a significance level of P < .05.
  
  
  RESULTS
  ShapeAnalysisMANCOVA showed no statistically significant difference between the average CBCT- and MSCT-based models (P > .68). During pairwise comparison, the mean difference observed was .406 mm (SD, .173). One sample t-test showed that mean differences between each set of paired CBCT- and MSCT-based models were not clinically significant (P = .411).
  
  
  CONCLUSIONS
  Three-dimensional surface models constructed from CBCT images are comparable to those derived from MSCT scans and may be considered reliable tools for assessing condylar morphology.
authors.affiliation: Department of Orthodontics, Faculdade de Odontologia de Araraquara, UNESP Universidade Estadual Paulista, Sao Paulo, Brazil; Department of Orthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA. Electronic address: lilianerosas@hotmail.com.
authors.forename: Liliane Rosas
authors.initials: LR
authors.lastname: Gomes
authors.affiliation: Private practice, Salvador, BA, Brazil.
authors.forename: Marcelo Regis
authors.initials: MR
authors.lastname: Gomes
authors.affiliation: Department of Orthodontics, Faculdade de Odontologia de Araraquara, UNESP Universidade Estadual Paulista, Sao Paulo, Brazil.
authors.forename: João Roberto
authors.initials: JR
authors.lastname: Gonçalves
authors.affiliation: Department of Orthodontics, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Antônio Carlos O
authors.initials: AC
authors.lastname: Ruellas
authors.affiliation: Departments of Oral and Maxillofacial Surgery and Orthodontics Texas, A&M University Health Science Center Baylor College of Dentistry, Baylor University Medical Center, Dallas, TX, USA.
authors.forename: Larry M
authors.initials: LM
authors.lastname: Wolford
authors.affiliation: Research Assistant Professor at the Department of Psychiatry, University of North Carolina, Chapel Hill, NC, USA.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Paniagua
authors.affiliation: Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Erika
authors.initials: E
authors.lastname: Benavides
authors.affiliation: Department of Orthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Lúcia Helena Soares
authors.initials: LH
authors.lastname: Cevidanes
mesh_terms: D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008335:Mandibular Condyle / Q000000981:diagnostic imaging* / Q000601:surgery; D008953:Models, Anatomic; D061330:Multidetector Computed Tomography; D011857:Radiographic Image Interpretation, Computer-Assisted; D015203:Reproducibility of Results