title: The relationship between tooth size discrepancy and archform classification in orthodontic patients.
abstract: BACKGROUND
  To determine the relationship between clinically significant tooth size discrepancies (TSD) and archform classification in orthodontic patients.
  
  
  METHODS
  Eighty teeth with artificial white spot lesions were randomly divided into four groups: (A) distilled and deionized water, (B) Nd:YAG laser, (C) CPP-ACP crème, & (D) CPP-ACP plus laser. SMH was measured using Vickers diamond indenter in Vickers Hardness Number (VHN). Two samples of each group were analyzed using scanning electron microscope (SEM). The results were analyzed with the SPSS 17/win.
  
  
  RESULTS
  Reproducibility of the classification of archform was very good (unweighted Kappa statistic of 0.83 with a 95% confidence interval of 0.73, 0.93). There was no statistically significant difference in the distribution of archform type between group 1 and group 2 for the upper (p=0.3305) or lower (p=0.6310) arches.
  
  
  CONCLUSIONS
  The presence of a clinically significant TSD and archform classification do not appear to be related. Key words:Tooth Size, Archform, Bolton discrepancy, digital models, polynomial curve, archform classification.
authors.affiliation: Specialist in Orthodontics, Orthodontic Unit, Oral Health and Development, University Dental School and Hospital, Wilton, Cork, Ireland.
authors.forename: Gerard
authors.initials: G
authors.lastname: O'Mahony
authors.affiliation: Professor, Orthodontic Unit, Oral Health and Development, University Dental School and Hospital Wilton, Cork, Ireland.
authors.forename: Declan T
authors.initials: DT
authors.lastname: Millett
authors.affiliation: Lecturer in statistics, school of mathematical sciences, University College Cork.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Cronin
authors.affiliation: Consultant / Senior Lecturer in Orthodontics, Dundee Dental Hospital, 2 Park Place, Dundee, DD1 4HR, UK.
authors.forename: Grant T
authors.initials: GT
authors.lastname: McIntyre
authors.affiliation: Lecturer, School of Manufacturing Engineering, Dublin Institute of Technology, Dublin, Ireland.
authors.forename: Mark K
authors.initials: MK
authors.lastname: Barry