title: [Radiographic study of maxillary sinus associated with molars in adult].
abstract: OBJECTIVE
  to explore the relationship between the maxillary sinus volume and the amount of alveolar bone, and the effect of molar loss upon the maxillary sinus was further analyzed,by measuring adult maxillary sinus volume, sinus ridge distance, and calculating the gasification coefficient of maxillary sinus.
  
  
  METHODS
  One hundred and ninety cases (361 maxillary sinus) with CT examinations were collected, they were divided into group A and group B, 121 cases (242 maxillary sinus) of normal subjects served as group A, 42 cases (65 maxillary sinus) with molar part off were B group, in which 31 maxillary sinus with a molar loss were group B1,22 maxillary sinus with two molar loss were B2 group,12 maxillary sinus with three molar loss (one molar remains) were B3 group, 27 cases (54 maxillary sinus) with upper teeth off were C group. Bymeasureing the maxillary sinus volume, sinus ridge distance and the size of the maxillary sinus, calculating the gasification coefficient, we analyzed the relationship between maxillary volume and sinus ridge distance, and comparatively analyzed the differences among the three groups in the size, gasification coefficient, volume of maxillary sinus and sinus ridge distance.
  
  
  RESULTS
  In the normal group,the volume of maxillary sinus and sinus ridge distance had a correlation coefficient of -0. 63,(P< 0.05); Sinus ridge distance in group A was larger than the other two groups (P<0.05), and larger in B group than in C group (P<0. 05), anteroposterior maxillary sinus diameter and reft-right diameter in C group was greater than in A group and B group(P<0.05), group C gasification coeffiecent was less than A group and B group (P<0. 05).
  
  
  CONCLUSIONS
  The volume of maxillary sinus is negatively correlated with the amont of alveolar bone; Upper teeth's shedding promotes maxillary sinus deformation; Maxiuary sinus volume has a tendency to decrease.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Hu
authors.forename: Daming
authors.initials: D
authors.lastname: Sun
authors.forename: Quansheng
authors.initials: Q
authors.lastname: Zhou
authors.forename: Yuli
authors.initials: Y
authors.lastname: Wang
authors.forename: Jingcheng
authors.initials: J
authors.lastname: Gu
authors.forename: Yaohua
authors.initials: Y
authors.lastname: Han
mesh_terms: D000328:Adult; D006801:Humans; D008437:Maxilla; D008443:Maxillary Sinus / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008963:Molar; D011859:Radiography; D016388:Tooth Loss