title: Is arch form influenced by sagittal molar relationship or Bolton tooth-size discrepancy?
abstract: BACKGROUND
  Orthodontic patients show high prevalence of tooth-size discrepancy. This study investigates the possible association between arch form, clinically significant tooth-size discrepancy, and sagittal molar relationship.
  
  
  METHODS
  Pretreatment orthodontic casts of 230 Saudi patients were classified into one of three arch form types (tapered, ovoid, and square) using digitally scanned images of the mandibular arches. Bolton ratio was calculated, sagittal molar relationship was defined according to Angle classification, and correlations were analyzed using ANOVA, chi-square, and t-tests.
  
  
  RESULTS
  No single arch form was significantly more common than the others. Furthermore, no association was observed between the presence of significant Bolton discrepancy and the sagittal molar relationship or arch form. Overall Bolton discrepancy is significantly more prevalent in males.
  
  
  CONCLUSIONS
  Arch form in a Saudi patient group is independent of gender, sagittal molar relationship, and Bolton discrepancy.
authors.affiliation: Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, P.O. Box 60169-38, Riyadh, 11545, Saudi Arabia. amaldrees@ksu.edu.sa.
authors.forename: Abdullah M
authors.initials: AM
authors.lastname: Aldrees
authors.affiliation: Resident, Department of Dentistry, King Fahad Medical City, Riyadh, Saudi Arabia. o_ams_o@hotmail.com.
authors.forename: Abdulmajeed M
authors.initials: AM
authors.lastname: Al-Shujaa
authors.affiliation: Resident, Advanced Education in General Dentistry Program, School of Dental Medicine, State University of New York at Buffalo, Buffalo, NY, USA. malqahta@buffalo.edu.
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Alqahtani
authors.affiliation: Division of Orthodontics, College of Dentistry, King Saud bin Abdulaziz University For Health Sciences, Consultant Orthodontist, National Guard Health Affairs, Riyadh, Saudi Arabia. aljhani.a@gmail.com.
authors.forename: Ali S
authors.initials: AS
authors.lastname: Aljhani
mesh_terms: D000293:Adolescent; D002648:Child; D017076:Computer-Aided Design; D003724:Dental Arch / Q000473:pathology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008297:Male; D008311:Malocclusion, Angle Class I / Q000473:pathology; D008312:Malocclusion, Angle Class II / Q000473:pathology; D008313:Malocclusion, Angle Class III / Q000473:pathology; D008334:Mandible / Q000473:pathology*; D003765:Models, Dental; D008963:Molar / Q000473:pathology*; D009811:Odontometry / Q000379:methods*; D061848:Optical Imaging / Q000379:methods; D012529:Saudi Arabia; D014070:Tooth / Q000473:pathology*; D019228:Tooth Crown / Q000473:pathology; D055815:Young Adult