title: Relationship of Anterior Alveolar Dimensions with Mandibular Divergence in Class I Malocclusion - A Cephalometric Study.
abstract: BACKGROUND
  One of the major limiting factors in retraction of proclined teeth is the width of the alveolus both in maxilla and mandible.
  
  
  OBJECTIVE
  The objective of this study was to assess the maxillary and mandibular anterior alveolar dimensions and to correlate with mandibular divergence in Class I bi-dento-alveolar protrusion patients.
  
  
  METHODS
  Pretreatment lateral cephalograms (n=88) were analysed using a composite analysis with cephalometric software. Both maxillary and mandibular anterior alveolar widths and heights were measured and correlated with mandibular divergence. One-way analysis (ANOVA) and Pearson correlation test were used to compare and establish the significance between groups.
  
  
  RESULTS
  Segregation of the data based on variation in the bi-cortical widths and heights showed that lesser alveolar widths and greater alveolar heights were associated with the high angled subjects and greater alveolar widths and lesser heights were associated with low angled subjects.
  
  
  CONCLUSIONS
  Patients with hyperdivergent mandible exhibited thin anterior alveolar width and greater alveolar height whereas low angled subjects had wider alveolar width and lesser alveolar height. Orthodontic treatment plan for retraction of anterior teeth must be based on these differences caused by variations in mandibular divergence.
authors.affiliation: Senior Lecturer, Department of Orthodontics, Meenakshi Ammal Dental College , Chennai, Tamilnadu, India .
authors.forename: Ratna Rachel
authors.initials: RR
authors.lastname: Ponraj
authors.affiliation: Professor, Department of Orthodontics, Saveetha Dental College , Chennai, Tamilnadu, India .
authors.forename: Vinoth Abraham
authors.initials: VA
authors.lastname: Korath
authors.affiliation: Reader, Department of Orthodontics, Meenakshi Ammal Dental College , Chennai, Tamilnadu, India .
authors.lastname: Nagachandran
authors.affiliation: Professor, Department of Orthodontics, Meenakshi Ammal Dental College , Chennai, Tamilnadu, India .
authors.forename: Devaki
authors.initials: D
authors.lastname: Vijayalakshmi
authors.affiliation: Professor, Department of Orthodontics, Meenakshi Ammal Dental College , Chennai, Tamilnadu, India .
authors.forename: Ratna
authors.initials: R
authors.lastname: Parameswaran
authors.affiliation: Reader, Department of Orthodontics, Meenakshi Ammal Dental College , Chennai, Tamilnadu, India .
authors.forename: Priya
authors.initials: P
authors.lastname: Raman
authors.affiliation: Reader, Department of Orthodontics, Meenakshi Ammal Dental College , Chennai, Tamilnadu, India .
authors.forename: Catherine
authors.initials: C
authors.lastname: Sunitha
authors.affiliation: Senior Lecturer, Department of Orthodontics, Meenakshi Ammal Dental College , Chennai, Tamilnadu, India .
authors.forename: Nayeemullah
authors.initials: N
authors.lastname: Khan
keywords: Cortical limits; Iatrogenic sequelae; Retraction