title: Sinus Width Analysis and New Classification with Clinical Implications for Augmentation.
abstract: OBJECTIVE
  To measure the distances between the medial and lateral sinus wall (sinus width [SW]) at different levels on cone beam computed tomography (CBCT) and apply those SW values to formulate a new sinus classification.
  
  
  METHODS
  Edentulous sites adjacent to maxillary sinuses with inadequate residual bone height (RBH) were included from the CBCT database. SW was measured at the heights of 1, 3, 5, 7, and 9 mm from the sinus floor. Mean SW was stratified into different groups by RBH, study sites (first and second premolars and molars), and measurement levels. Statistical analyses were conducted with commercially available software (IBM SPSS Statistics 19, SPSS Inc., Chicago, IL, USA).
  
  
  RESULTS
  A total 186 patients (mean age 50.4 years) with 267 edentulous sites were included. Mean SW was wider at molar sites, higher measurement levels, and sites with less RBH. Narrow, average, or wide sinuses were classified based on the 33rd and 67th percentile SW values at 1-, 5-, and 9-mm measurement levels, respectively.
  
  
  CONCLUSIONS
  SW at different levels relating to sinus floor elevation was measured. The proposed classification could contribute to estimate the difficulty of sinus augmentation, useful for the selection of surgical approaches. Further studies are required to testify its clinical implications.
authors.affiliation: State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, Sichuan, China.|Department of Oral Implantology, National Clinical Key Specialty, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors.forename: Minhua
authors.initials: M
authors.lastname: Teng
authors.affiliation: Department of Orthodontics, Hospital of Stomatology, Luzhou Medical College, Luzhou, Sichuan, China.|Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Luzhou Medical College, Luzhou, Sichuan, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Cheng
authors.affiliation: Department of Prosthodontics, Affiliated Hospital of GuiYang Medical University, Guiyang, Guizhou, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Liao
authors.affiliation: Department of Science and Education, AVIC 363 Hospital, Chengdu, Sichuan, China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Oral Implantology, National Clinical Kay Specialty, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors.forename: Anchun
authors.initials: A
authors.lastname: Mo
authors.affiliation: Department of Prothodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors.forename: Xing
authors.initials: X
authors.lastname: Liang
mesh_terms: D000328:Adult; D000368:Aged; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging* / Q000601:surgery*; D008875:Middle Aged; D059546:Sinus Floor Augmentation
keywords: CBCT imaging; edentulous maxilla; maxillary sinus; sinus floor elevation