title: Histologic changes in the maxillary sinus membrane after sinus membrane elevation and the simultaneous insertion of dental implants without the use of grafting materials.
abstract: OBJECTIVE
  The aim of this study was to evaluate the histologic changes in the maxillary sinus membrane after sinus membrane elevation and the simultaneous insertion of dental implants without additional grafting material.
  
  
  METHODS
  In 6 mongrel dogs, bilateral edentulated flat alveolar ridges were created in the maxilla. After 3 months of healing, an implant was unilaterally placed in the maxillary sinus in such a way that it protruded 5 mm into the maxillary sinus after sinus membrane elevation. On the opposite side, the maxillary sinus was left untreated as a control site. The animals were killed 6 months after surgery. The maxillary sinus mucosa was examined using light microscopy and scanning and transmission electronic microscopy.
  
  
  RESULTS
  There were no morphologic or ultrastructural differences in the sinus membrane between groups.
  
  
  CONCLUSIONS
  The results indicate that the surgical procedure by which implants are inserted into the sinus cavity by elevating the sinus membrane without adding any graft material appears to have little influence on the histologic characteristics of the sinus membrane.
authors.affiliation: Department of Dentistry, Yonsei University Wonju College of Medicine, Wonju, South Korea.
authors.forename: Sung-Han
authors.initials: SH
authors.lastname: Sul
authors.forename: Byung-Ho
authors.initials: BH
authors.lastname: Choi
authors.forename: Jingxu
authors.initials: J
authors.lastname: Li
authors.forename: Seung-Mi
authors.initials: SM
authors.lastname: Jeong
authors.forename: Feng
authors.initials: F
authors.lastname: Xuan
mesh_terms: D000818:Animals; D016025:Bone Transplantation; D002923:Cilia / Q000648:ultrastructure; D003758:Dental Implantation, Endosseous / Q000379:methods*; D004285:Dogs; D005260:Female; D020397:Goblet Cells / Q000648:ultrastructure; D008443:Maxillary Sinus / Q000601:surgery* / Q000648:ultrastructure; D008566:Membranes / Q000166:cytology / Q000648:ultrastructure; D008853:Microscopy / Q000379:methods; D020545:Respiratory Mucosa / Q000648:ultrastructure*