title: Changes in alveolar bone height and width following ridge augmentation using bone graft and membranes.
abstract: BACKGROUND
  Clinical observation suggests the amount of bone height and width created during guided bone regeneration (GBR) to augment alveolar ridges is not retained during healing. A study was designed to determine: 1) whether the amount of osseous structure 4 months postoperatively after GBR was significantly less than the amount surgically created; and 2) if this change was uniform over the area treated.
  
  
  METHODS
  Nineteen extraction sites (10 patients) were treated with GBR prior to placing endosseous implants. Allograft (DMFDB) and a bioabsorbable membrane were employed. Standardized measurements were taken of alveolar height and width 1) prior to augmentation; 2) after placement of graft and membrane; and 3) following 4 months of healing. Width measurements were taken 3 mm, 5 mm, and 10 mm from the crest at 3 intervals: the mesio-distal midpoint of the edentulous area and 3 mm mesial and distal to the midpoint. Height measurements were recorded at the mesio-distal midpoint and points 3 mm mesial and distal to the midpoint.
  
  
  RESULTS
  Loss in width of supplemented bone after 4 months of healing ranged from 52.1% to 58.0% 3 mm from the crest, 47.6% to 67.4% 5 mm from the crest, and 39.1 % to 46.7% 10 mm from the crest. Loss of augmented height averaged 14. 7% in the center of the edentulous area but ranged from 60.5% to 76.3% 3 mm mesial and distal to the midpoint.
  
  
  CONCLUSIONS
  The results indicate significant non-uniform loss of augmented alveolar height and width during GBR healing. The implications of these findings impact preoperative augmentation planning for endosseous implantology.
authors: Department of Periodontics, UMDNJ-NJ Dental School, Newark, NJ 07103, USA.
authors: B I
authors: BI
authors: Simon
authors: S
authors: S
authors: Von Hagen
authors: M J
authors: MJ
authors: Deasy
authors: M
authors: M
authors: Faldu
authors: D
authors: D
authors: Resnansky
mesh_terms: D016301:Alveolar Bone Loss / Q000601:surgery; D000539:Alveolar Process / Q000473:pathology*; D000540:Alveolar Ridge Augmentation; D001861:Bone Regeneration / Q000502:physiology*; D016025:Bone Transplantation; D002508:Cephalometry; D003758:Dental Implantation, Endosseous; D005500:Follow-Up Studies; D016557:Guided Tissue Regeneration, Periodontal; D006801:Humans; D008567:Membranes, Artificial; D010347:Patient Care Planning; D012008:Recurrence; D012044:Regression Analysis
chemical_list: D008567:Membranes, Artificial