title: A retrospective study of the effects on sinus complications of exposing dental implants to the maxillary sinus cavity.
abstract: OBJECTIVE
  The aim of this study was to investigate whether dental implant exposure to the maxillary sinus cavity increased the risk of maxillary sinus complications.
  
  
  METHODS
  Nine patients with 23 implants that had been inserted into the maxillary sinus more than 4 mm without lifting the sinus mucous membranes were evaluated for sinus complications 6 to 10 months after implant insertion, using a questionnaire and computerized tomography (CT).
  
  
  RESULTS
  There were no clinical signs of sinusitis in any patient. However, CT scans showed postoperative sinus mucous thickening around 14 of the 23 implants.
  
  
  CONCLUSIONS
  This study showed that implant exposure to the maxillary sinus cavity can cause sinus mucous thickening around the implants.
authors.affiliation: Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Seoul, South Korea.
authors.forename: Jae-Hyung
authors.initials: JH
authors.lastname: Jung
authors.forename: Byung-Ho
authors.initials: BH
authors.lastname: Choi
authors.forename: Seung-Mi
authors.initials: SM
authors.lastname: Jeong
authors.forename: Jingxu
authors.initials: J
authors.lastname: Li
authors.forename: Seoung-Ho
authors.initials: SH
authors.lastname: Lee
authors.forename: Hyeon-Jung
authors.initials: HJ
authors.lastname: Lee
mesh_terms: D003758:Dental Implantation, Endosseous / Q000009:adverse effects / Q000379:methods*; D015921:Dental Implants / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging / Q000601:surgery*; D015523:Maxillary Sinusitis / Q000209:etiology; D008875:Middle Aged; D009092:Mucous Membrane / Q000473:pathology; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D014057:Tomography, X-Ray Computed
chemical_list: D015921:Dental Implants