title: Radiographic monitoring of changes in bone height after implant placement in combination with an internal sinus lift without graft material.
abstract: OBJECTIVE
  The objective was to investigate changes in bone height after implant placement in combination with simultaneous internal sinus lift (ISL) without graft material.
  
  
  METHODS
  For a retrospective clinical study, 101 implants placed in combination with ISL without graft were selected. The study included 66 patients (mean age 59.6 years) with radiographs from baseline (T0) and two follow-ups after mean times of 7 months (T1) and 17 months (T2). Apical changes in bone height were measured at the mesial and distal aspects of the implant. Correlation analysis was performed to identify factors affecting changes in bone height.
  
  
  RESULTS
  Mean apical bone gains of 1.0 mm (mesial) and 1.7 mm (distal) were observed at T1. At T2, mean apical bone gains were 1.5 mm and 2.1 mm (distal). The change in apical bone height was significant between T0 and T1, between T0 and T2, and between T1 and T2. Rank correlation analysis revealed a significant correlation (Spearman rho: -0.2 to -0.4) between small initial bone height and a greater amount of apical bone gain.
  
  
  CONCLUSIONS
  A gain in apical bone height can be expected if implants are placed in combination with ISL without graft material. Variability is high, however.
authors: Department of Prosthodontics, Heidelberg University Hospital, Heidelberg, Germany.
authors: Peter
authors: P
authors: Rammelsberg
authors: Jaleh
authors: J
authors: Mahabadi
authors: Constantin
authors: C
authors: Eiffler
authors: Andreas
authors: A
authors: Koob
authors: Stefanie
authors: S
authors: Kappel
authors: Olaf
authors: O
authors: Gabbert
mesh_terms: D000328:Adult; D000368:Aged; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging* / Q000601:surgery*; D008875:Middle Aged; D011862:Radiography, Panoramic; D012189:Retrospective Studies; D059546:Sinus Floor Augmentation; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: atrophic maxilla; radiographs; sinus floor elevation