title: Meta-regression analysis of the initial bone height for predicting implant survival rates of two sinus elevation procedures.
abstract: OBJECTIVE
  To undertake a systematic review for the association between the initial alveolar bone height and the success of dental implants with sinus elevation procedures.
  
  
  METHODS
  An online search was performed using the following electronic databases: PubMed, Medline, Science Direct, and Blackwell synergy. Two investigators independently assessed publications for inclusion and extracted data. Meta-regression analyses were used to test the associations between the initial alveolar bone height and implant survival with lateral window or osteotome sinus elevation procedures.
  
  
  RESULTS
  Of 635 studies, 21 were included for analysis. A quadratic curve-fitting meta-regression showed an increasing trend of implant survival rate with greater initial bone height for the lateral window technique (p<0.0001, adjusted R(2)=0.97). The result of the meta-regression for hazard rates showed a decreasing trend (p=0.0041, adjusted R(2)=0.89). No association was found for the osteotome technique.
  
  
  CONCLUSIONS
  For the lateral window technique, meta-regression analysis suggested a positive association between the initial alveolar bone height and implant survival rates. No relationship was found between the initial alveolar bone height and implant survival rate for the osteotome technique due to a lack of data below 4 mm of initial bone height.
authors.affiliation: Department of Dentistry, Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan.
authors.forename: Yueh-Ling
authors.initials: YL
authors.lastname: Chao
authors.forename: Hsiu-His
authors.initials: HH
authors.lastname: Chen
authors.forename: Chih-Chun
authors.initials: CC
authors.lastname: Mei
authors.forename: Yu-Kang
authors.initials: YK
authors.lastname: Tu
authors.forename: Hsein-Kun
authors.initials: HK
authors.lastname: Lu
mesh_terms: D016301:Alveolar Bone Loss / Q000473:pathology*; D018786:Bone Substitutes; D016025:Bone Transplantation; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D019232:Dental Restoration Failure; D006801:Humans; D008443:Maxillary Sinus / Q000601:surgery*; D015588:Observer Variation; D013516:Oral Surgical Procedures, Preprosthetic / Q000379:methods*; D010027:Osteotomy / Q000295:instrumentation; D016016:Proportional Hazards Models; D012044:Regression Analysis; D016896:Treatment Outcome
chemical_list: D018786:Bone Substitutes; D015921:Dental Implants