title: BaS analysis: a new cephalometric study for craniofacial malformations.
abstract: OBJECTIVE
  Patients submitted to surgical advancement of the upper and middle facial third might have a relapse of the skeletal retraction after the removal of the distractor devices. Clinical signs related to this process are usually represented by exophthalmos, Obstructive sleep apnea syndrome (OSAS) or prognathism; however, the analytic definition of the relapse is very difficult , conventional cephalometric methods being influenced by the spatial movement of "N" (nasion) or "Or" (orbital) points. The authors present a new cephalometric technique that could be used as a more objective mean of follow-up evaluation of patients undergoing craniofacial advancement.
  
  
  METHODS
  The cephalometric analysis proposed is based on angles, lines, areas and distances between BaS (Basion-Sella) axis and other craniofacial landmark points. We have defined this cephalometric technique as "BaS Analysis".
  
  
  CONCLUSIONS
  The "BaS analysis" is not influenced by splanchnocranium movements in the space; for this reason, it can be considered a useful method for cephalometric analysis in the follow-up of patients with craniofacial malformations.
authors.affiliation: MaxilloFacial Surgery, Catholic University Medical School, Via G. Moscati 31-33, Rome 00168, Italy.
authors.forename: Sandro
authors.initials: S
authors.lastname: Pelo
authors.forename: Laura
authors.initials: L
authors.lastname: Cacucci
authors.forename: Roberto
authors.initials: R
authors.lastname: Boniello
authors.forename: Alessandro
authors.initials: A
authors.lastname: Moro
authors.forename: Roberto
authors.initials: R
authors.lastname: Deli
authors.forename: Cristina
authors.initials: C
authors.lastname: Grippaudo
authors.forename: Concezio
authors.initials: C
authors.lastname: Di Rocco
authors.forename: Gianpiero
authors.initials: G
authors.lastname: Tamburrini
authors.forename: Luca
authors.initials: L
authors.lastname: Massimi
authors.forename: Massimo
authors.initials: M
authors.lastname: Caldarelli
authors.forename: Giulio
authors.initials: G
authors.lastname: Gasparini
mesh_terms: D000168:Acrocephalosyndactylia / Q000473:pathology; D000293:Adolescent; D002508:Cephalometry / Q000379:methods*; D019465:Craniofacial Abnormalities / Q000473:pathology*; D005145:Face / Q000002:abnormalities / Q000473:pathology; D005147:Facial Bones / Q000002:abnormalities / Q000254:growth & development / Q000473:pathology; D005260:Female; D006801:Humans; D008334:Mandible / Q000002:abnormalities / Q000473:pathology; D008445:Maxillofacial Development; D012399:Rotation