title: Correlation Between Bone and Soft Tissue Thickness in Maxillary Anterior Teeth.
abstract: OBJECTIVE
  The purpose of this study was to determine buccal bone and soft tissue thicknesses and their correlation in the maxillary anterior region using cone beam computed tomography (CBCT).
  
  
  METHODS
  In this cross sectional study, 330 sound maxillary incisors in 60 patients with a mean age of 37.5 years were assessed by CBCT scans. For better visualization of soft tissue, patients were asked to use plastic retractors in order to retract their lips and cheeks away from the gingival tissue before taking the scans. Measurements were made in three different positions: at the crest and at 2 and 5mm apical to the crest. The cementoenamel junction-crest distance was measured. for data analyses, the Pearson's correlation coefficient, ANOVA and intraclass correlation coefficient were used.
  
  
  RESULTS
  There were mildly significant linear associations between labial soft tissue and bone thickness in the canines and incisors (r<0.40, P<0.05), but no association was found for the lateral incisors. The mean thickness of buccal bone differed significantly in the maxillary anterior teeth, being greater for the lateral incisors (P<0.05). For soft tissue thickness, the results were the same, and the least thickness was recorded for the canines. There was a mild association between labial soft tissue and bone thickness in canines and incisors (r=0.2, P=0.3), but no such linear association was seen for the lateral incisors.
  
  
  CONCLUSIONS
  The mean thickness of buccal bone and soft tissue in the anterior maxilla was <1mm and there was a mild linear correlation between them.
authors.affiliation: Associated Professor, Department of Periodontics, Dental Branch, Islamic Azad University, Tehran, Iran; Member of Dental Implant Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Nasrin
authors.initials: N
authors.lastname: Esfahanizadeh
authors.affiliation: General Dentist, College Station, Texas, USA.
authors.forename: Niloufar
authors.initials: N
authors.lastname: Daneshparvar
authors.affiliation: Periodontist, Private Practice, Tehran, Iran.
authors.forename: Farinaz
authors.initials: F
authors.lastname: Askarpour
authors.affiliation: Assistant Professor, Department of Mathematics, South Tehran Branch, Islamic Azad University, Tehran, Iran.
authors.forename: Nasrin
authors.initials: N
authors.lastname: Akhoundi
authors.affiliation: Assistant Professor, Head of Department of Oral and Maxillofacial Radiology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Panjnoush
keywords: Cone-Beam Computed Tomography; Esthetics, Dental; Facial Bones; Maxilla