title: A hybrid technique for sinus floor elevation in the severely resorbed posterior maxilla.
abstract: OBJECTIVE
  This study aimed to evaluate the effectiveness of the modified sinus floor elevation technique described hereafter as a "hybrid technique," in 11 patients with severely resorbed posterior maxillae.
  
  
  METHODS
  Eleven patients who received 22 implants in the maxillary premolar and molar areas by the hybrid technique were enrolled in this study. A slot-shaped osteotomy for access was prepared on the lateral wall along the lower border of the sinus floor. The Schneiderian membrane was fully reflected through the lateral slot. Following drilling with the membrane protected by a periosteal elevator, the bone was grafted. All implants were placed simultaneously with sinus augmentation. The cumulative success rate was calculated and clinical parameters were recorded. Radiographic measurements were performed.
  
  
  RESULTS
  All implants were well maintained at last follow up (cumulative success rate=100%). The mean residual bone height, augmented bone height, crown-to-implant ratio, and marginal bone loss were 4.1+/-1.64 mm, 8.76+/-1.77 mm, 1.21+/-0.33 mm, and 0.34+/-0.72 mm, respectively.
  
  
  CONCLUSIONS
  Simultaneous implant placement with sinus augmentation by hybrid technique showed successful clinical results over a 2-year observation period and may be a reliable modality for reconstruction of a severely resorbed posterior maxilla.
authors.affiliation: Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Ui-Won
authors.initials: UW
authors.lastname: Jung
authors.forename: Ji-Youn
authors.initials: JY
authors.lastname: Hong
authors.forename: Jung-Seok
authors.initials: JS
authors.lastname: Lee
authors.forename: Chang-Sung
authors.initials: CS
authors.lastname: Kim
authors.forename: Kyoo-Sung
authors.initials: KS
authors.lastname: Cho
authors.forename: Seong-Ho
authors.initials: SH
authors.lastname: Choi