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J Periodontol ; 71(11): 1774-91, 2000 Nov.
Article in English | MEDLINE | ID: mdl-11128929

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.


Subject(s)
Alveolar Process/pathology , Alveolar Ridge Augmentation , Bone Regeneration/physiology , Guided Tissue Regeneration, Periodontal , Alveolar Bone Loss/surgery , Bone Transplantation , Cephalometry , Dental Implantation, Endosseous , Follow-Up Studies , Humans , Membranes, Artificial , Patient Care Planning , Recurrence , Regression Analysis
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