In radiographic assessment, the pattern of alveolar bone loss with respect to quality is described as:

• A. Generalized only
• B. Localized only
• C. Horizontal only
• D. Horizontal and/or vertical

Answer: (D)

In radiographic assessment of periodontal bone loss, the pattern refers to how the bone crest changes relative to the teeth, not just how widespread the loss is. The two main patterns are horizontal and vertical. Horizontal bone loss means the crest recedes in a relatively uniform way around the teeth, so the distance from the cementoenamel junction to the crest decreases by roughly the same amount on multiple teeth. Vertical bone loss, or infrabony/angular defects, shows an uneven crest with angles and localized pockets, creating wedge- or trough-shaped areas around one or a few teeth. Since a mouth can exhibit both patterns in different regions, the description is that bone loss can be horizontal and/or vertical.