title: Simultaneous sinus lift and implant installation: prospective study of consecutive two hundred seventeen sinus lift and four hundred sixty-two implants.
abstract: OBJECTIVE
  If less than 4 mm of residual bone is remained in posterior maxilla, two-stage operation is recommended for implant installation. However, if primary stability could be obtained using tapered designed implants, one-stage surgery could be performed with reliable success rate in severely resorbed maxilla. The purpose of this prospective study was to evaluate survival and success rates of the implants simultaneously placed into grafted sinus using rough-surfaced implant.
  
  
  METHODS
  A total of two hundred seventeen consecutive sinus lifting through lateral approach and four hundred sixty-two simultaneous implants were installed from November 2003 for 5.5 years. Xenogenic bone was used solely for bone graft materials. Second surgery was performed around 6 months after operation and porcelain fused metal or gold crown was used for definitive restorations. Cumulative survival and success rates were evaluated according to residual alveolar bone height (RABH), smoking status, and Schneiderian membrane perforation.
  
  
  RESULTS
  The mean follow-up was 57.1 ± 15.6 (36-98) months. Of the four hundred sixty-two implants, two hundred sixty-two implants (56.7%: group 1) were installed in posterior maxilla less than 4-mm RABH and two hundred implants (43.3%: group 2) were placed in over 5-mm RABH. The cumulative survival and success rates were 98.91% and 96.54%. There was no statistically significant difference in success rate between group 1 and group 2 (p = .3135). Perforation of the membrane was not related to success (p = .7162), but smoking status is significantly related with implant failure (p = .0003).
  
  
  CONCLUSIONS
  Sinus lifting with simultaneous implant placement could be used to treat atrophic maxilla in patients with minimal RABH when initial stability could be obtained by using taper designed implants with surgical techniques. Smoking is a possible factor for implant failure. Membrane perforation did not have an adverse effect on implant success if the membrane was repaired with absorbable membrane and fibrin glue.
authors.affiliation: Department of Prosthodontics, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea.
authors.forename: Hyun-Suk
authors.initials: HS
authors.lastname: Cha
authors.forename: Andrew
authors.initials: A
authors.lastname: Kim
authors.forename: Hessam
authors.initials: H
authors.lastname: Nowzari
authors.forename: Hoo-Sun
authors.initials: HS
authors.lastname: Chang
authors.forename: Kang-Min
authors.initials: KM
authors.lastname: Ahn
mesh_terms: D015921:Dental Implants; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000601:surgery*; D011446:Prospective Studies; D011475:Prosthesis Failure
chemical_list: D015921:Dental Implants