Osseous Defect
An angular or crater-like resorptive lesion in the alveolar bone surrounding a tooth, classified by the number of remaining bony walls.
Full Definition
Osseous defects are morphological abnormalities of the alveolar bone resulting from periodontal disease, trauma, or developmental anomalies. They are classified by the number of residual bony walls — one-wall, two-wall, three-wall (intrabony), or a combination — and this classification guides regenerative surgical decision-making. A three-wall defect offers the most favourable prognosis for regeneration because it provides the greatest containment for grafting materials. Editors working on surgical reports must note that the terms 'osseous defect,' 'intrabony defect,' and 'infrabony defect' are often used interchangeably in the literature, though 'intrabony' is the preferred contemporary term. The adjective 'osseous' should not be confused with 'ossified,' which denotes mineralisation.
Usage
Usage note: When editing, confirm whether the author distinguishes between 'osseous defect' (morphological description) and 'intrabony defect' (defect located below the alveolar crest). Standardise usage if the terms are used interchangeably without definition.
In Context
- "A three-wall osseous defect measuring 6 mm in depth was identified on the mesial aspect of tooth 36." — Surgical case note
- "The classification and management of osseous defects are discussed in detail in Chapter 7." — Periodontal textbook