title: A systematic review of the success of sinus floor elevation and survival of implants inserted in combination with sinus floor elevation. Part II: transalveolar technique.
abstract: OBJECTIVE
  The objectives of this systematic review were to assess the survival rate of implants placed in sites with transalveolar sinus floor elevation.
  
  
  METHODS
  An electronic search was conducted to identify prospective and retrospective cohort studies on transalveolar sinus floor elevation, with a mean follow-up time of at least 1 year after functional loading. Failure and complication rates were analyzed using random-effects Poisson regression models to obtain summary estimates/ year proportions.
  
  
  RESULTS
  The search provided 849 titles. Full-text analysis was performed for 176 articles, resulting in 19 studies that met the inclusion criteria. Meta-analysis of these studies indicated an estimated annual failure rate of 2.48% (95% confidence interval (95% CI): 1.37-4.49%) translating to an estimated survival rate of 92.8% (95% CI): 87.4-96.0%) for implants placed in transalveolarly augmented sinuses, after 3 years in function. Furthermore, subject-based analysis revealed an estimated annual failure of 3.71% (95% CI: 1.21-11.38%), translating to 10.5% (95% CI: 3.6-28.9%) of the subjects experiencing implant loss over 3 years.
  
  
  CONCLUSIONS
  Survival rates of implants placed in transalveolar sinus floor augmentation sites are comparable to those in non-augmented sites. This technique is predictable with a low incidence of complications during and post-operatively.
authors: Department of Restorative Dentistry, National Dental Center, Singapore, Singapore.
authors: Wah Ching
authors: WC
authors: Tan
authors: Niklaus P
authors: NP
authors: Lang
authors: Marcel
authors: M
authors: Zwahlen
authors: Bjarni E
authors: BE
authors: Pjetursson
mesh_terms: D000540:Alveolar Ridge Augmentation / Q000379:methods*; D015921:Dental Implants; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006801:Humans; D008437:Maxilla / Q000601:surgery*; D008443:Maxillary Sinus / Q000601:surgery*; D010027:Osteotomy / Q000379:methods; D011183:Postoperative Complications; D011446:Prospective Studies; D012189:Retrospective Studies; D016019:Survival Analysis
chemical_list: D015921:Dental Implants