title: [Cone-beam CT study of bone septa during maxillary sinus lift among Changzhou population].
abstract: OBJECTIVE
  To observe the incidence, location, morphological characteristics of sinus septa among Changzhou population, and to investigate the relationship between maxillary posterior teeth loss and bony septum, and the guiding significance for sinus lift.
  
  
  METHODS
  One hundred and twenty-four subjects were selected, the preoperative cone-beam CT (CBCT) data was analyzed by NNT software, which provided a three-dimensional measurement of the maxillary sinus septa. SPSS 13.0 software package was used for statistical analysis.
  
  
  RESULTS
  33.87%（42/124）subjects had sinus septa, 27.42%（68/248）sinus had septa. 66.18% (45/68) of the septa were located in the middle region, 22.06% （15/68）in the posterior region, 11.76%（8/68） in the anterior region. The occurrence of sinus septa had no relation with gender, age and loss of teeth.
  
  
  CONCLUSIONS
  The sinus septa can be observed by CBCT for the position, pattern, to predict the difficulty of the surgery, and enhance the success rate.
authors.affiliation: Department of Implantology, College of Stomatology, Stomatological Hospital Affiliated to Anhui Medical University. Hefei 230032, Anhui Province, China. E-mail:329143471@qq.com.
authors.forename: Min-zhen
authors.initials: MZ
authors.lastname: Chen
authors.affiliation: Department of Implantology, Changzhou Stomatological Hospital. Changzhou 213003; 3.Occupational Disease Prevention Division, Changzhou Center for Disease Control and Prevention. Changzhou 213022, Jiangsu Province, China.
authors.forename: Yong-fu
authors.initials: YF
authors.lastname: Xie
authors.affiliation: Department of Implantology, Changzhou Stomatological Hospital. Changzhou 213003, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Xie
authors.affiliation: Department of Implantology, Changzhou Stomatological Hospital. Changzhou 213003; 3.Occupational Disease Prevention Division, Changzhou Center for Disease Control and Prevention. Changzhou 213022, Jiangsu Province, China.
authors.forename: Guo-hai
authors.initials: GH
authors.lastname: Wang
authors.affiliation: Department of Implantology, College of Stomatology, Stomatological Hospital Affiliated to Anhui Medical University. Hefei 230032, Anhui Province, China.
authors.forename: Jia-cai
authors.initials: JC
authors.lastname: He
mesh_terms: D002681:China / Q000453:epidemiology; D054893:Cone-Beam Computed Tomography; D006801:Humans; D008437:Maxilla; D008443:Maxillary Sinus / Q000000981:diagnostic imaging*; D012984:Software; D016388:Tooth Loss / Q000453:epidemiology*