Which statement best describes alveolar bone loss pattern with respect to quality?

• A. Generalized or localized
• B. Crestal resorption only
• C. PDL-space widening only
• D. Horizontal and/or vertical

Answer: (D)

Alveolar bone loss patterns describe how the bone around the teeth is destroyed, not just how much or where it happens. There are two main geometric patterns: horizontal bone loss, where the bone crest recedes more or less evenly across several teeth so the distance from the CEJ to the crest increases uniformly; and vertical (intrabony) defects, where bone loss progresses more on one side of a tooth, creating angular or trough-like defects and sometimes multiple-wall pockets. In a mouth you can see either pattern, or a combination of both, which is why describing the pattern as horizontal and/or vertical covers the possibilities. The other options describe distribution or related findings but don’t capture the fundamental patterns of bone loss geometry.