title: Implant placement immediately after the lateral approach of the trap door window procedure to create a maxillary sinus lift without bone grafting: a 2-year retrospective evaluation of 47 implants in 33 patients.
abstract: OBJECTIVE
  The present study was undertaken to retrospectively evaluate the status of implants in patients subjected to a maxillary sinus lift and immediate implant placement without bone grafting.
  
  
  METHODS
  Seventy-five implants were placed in 47 patients from 2000 to 2006. Lateral approach for the trap-door, open-window method for sinus lifting without placement of either autogenous bone grafts or allogeneic bone substitute was carried out. A 5-mm of the bone level was required in the alveolar ridge for all. All implants were placed synchronously with sinus lifting procedure. Patients underwent strict oral hygiene instruction, periodontal charting, presurgical/postsurgical panoramic radiographs, and postsurgical computed tomographic scan during the follow-up. The implant survival was defined when the prosthesis had been delivered and followed for 2 years without infection, pain, or more than 2-mm peri-implant bone loss.
  
  
  RESULTS
  Thirty-three patients (23 males, 10 females) having an average age of 55 years old, with a total of 47 fixtures were followed for more than 2 years after prosthesis delivery. No patients developed sinusitis or other complications leading to loss of an implant subsequent to performance of the sinus lifting-combined immediate implant surgery. The 2-year survival of fixture was 100%. Increases in lifted sinus bone height ranged from 3 mm to 9 mm with an average of 4.5 mm. The peri-implant health was judged to be good with a peri-implant sulcus depth of 2.7 +/- 0.5 mm at 2-year follow-up.
  
  
  CONCLUSIONS
  A good survival rate was observed in the immediate implant placement synchronously with the lateral approach for maxillary sinus lift without bone grafting.
authors.affiliation: Oral and Maxillofacial Surgery, Kaoshiung-Veterans General Hospital, Kaoshiung, Taiwan.
authors.forename: Ta-Wei
authors.initials: TW
authors.lastname: Chen
authors.forename: Haw-Sheng
authors.initials: HS
authors.lastname: Chang
authors.forename: Kam-Wing
authors.initials: KW
authors.lastname: Leung
authors.forename: Yu-Lin
authors.initials: YL
authors.lastname: Lai
authors.forename: Shou-Yen
authors.initials: SY
authors.lastname: Kao
mesh_terms: D000540:Alveolar Ridge Augmentation / Q000379:methods*; D001861:Bone Regeneration / Q000502:physiology; D003724:Dental Arch / Q000601:surgery; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008437:Maxilla / Q000601:surgery*; D008443:Maxillary Sinus / Q000601:surgery*; D008875:Middle Aged; D010512:Periodontal Index; D011183:Postoperative Complications; D011862:Radiography, Panoramic; D012189:Retrospective Studies; D013524:Surgical Flaps; D016019:Survival Analysis; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants