title: [The C0 line: from Delaire's analysis of craniofacial structure to modeling it on a computer spreadsheet].
abstract: BACKGROUND
  We developed a computer spreadsheet allowing mathematical modelization of Delaire's craniofacial architecture analysis.
  
  
  METHODS
  An orthonormed drawing field was defined from the classical C1 line and the new C0 line. The cartesian coordinates defined anatomic points in this orthonormed field. Lines were drawn from the coordinate equations defined on the basis of the laws of plane geometry. These formulae were then entered into the spreadsheet.
  
  
  RESULTS
  The spreadsheet automatically calculates the line equations, the angles separating these lines, and the coordinates of the constructed points, in the defined orthonormed field. This calculation is achieved using the coordinates of the user-measured anatomic points. A new order in line drawing allows simplification of manual drawing.
  
  
  CONCLUSIONS
  We present the advantages and inconveniences of this new method which does not modify the final drawing result nor the interpretation of Delaire's analysis.
authors.affiliation: Clinique Stomatologique, Service de Chirurgie Maxillo-Faciale, Hôtel Dieu, 44093 Nantes cedex 1. nnimeskern@aol.com
authors.forename: N
authors.initials: N
authors.lastname: Nimeskern
authors.forename: J-M
authors.initials: JM
authors.lastname: Mercier
mesh_terms: D002508:Cephalometry / Q000379:methods*; D003196:Computer Graphics; D006801:Humans; D008954:Models, Biological; D011859:Radiography; D012886:Skull / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D012984:Software