title: Relationship between vertical facial patterns and dental arch form in class II malocclusion.
abstract: BACKGROUND
  The purpose of this study is to evaluate the relationship between dental arch form and the vertical facial pattern determined by the angle between the mandibular plane and the anterior cranial base (Sella-nasion/mandibular plane angle (SN-MP)) in skeletal class II untreated patients.
  
  
  METHODS
  A sample of 73 Caucasians patients with untreated skeletal class II in permanent dentition was divided into three groups according to the values of the angle SN-MP. An evaluation of the arch form was performed by angular and linear relation values on each patient. Regression analysis was used to determine the statistical significance of the relationships between SN-MP angle and dental arch form. The differences among the three groups were analyzed for significance using a variance analysis.
  
  
  RESULTS
  A decrease of the upper arch transversal diameters in high SN-MP angle patients and an increase in low angle SN-MP ones (P<0.05) were shown. Result analysis showed a change in upper arch shape, with a smaller intercanine width in patients with high SN-MP angle and a greater one in low angle patients. As SN-MP angle increased, the upper arch form tended to be narrower. No statistically significant difference in mandibular arch form among the three groups was found, except the angle value related to incisors position.
  
  
  CONCLUSIONS
  The results showed the association between the upper dental arch form and the vertical facial pattern. On the contrary, the lower arch form was not related to the mandibular divergence.
authors: Catholic University of Sacred Heart, Largo Francesco Vito 1, Rome 00198, Italy. cgrippaudo@rm.unicatt.it.
authors: Cristina
authors: C
authors: Grippaudo
authors: Bruno
authors: B
authors: Oliva
authors: Anna Lucia
authors: AL
authors: Greco
authors: Simone
authors: S
authors: Sferra
authors: Roberto
authors: R
authors: Deli
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000379:methods; D002648:Child; D003481:Cuspid / Q000473:pathology; D003724:Dental Arch / Q000473:pathology*; D006801:Humans; D007180:Incisor / Q000473:pathology; D008312:Malocclusion, Angle Class II / Q000473:pathology*; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D008963:Molar / Q000473:pathology; D009295:Nasal Bone / Q000473:pathology; D010781:Photography / Q000379:methods; D012658:Sella Turcica / Q000473:pathology; D019291:Skull Base / Q000473:pathology; D014716:Vertical Dimension; D055815:Young Adult