What is the pattern of cancellous bone in the anterior mandible?

• A. Trabeculae are thinner and more numerous, marrow spaces are small.
• B. Similar to posterior maxilla.
• C. No cancellous bone.
• D. Trabeculae are fewer, thicker, and horizontally oriented, marrow spaces are large, overall coarse pattern.

Answer: (D)

The pattern being tested is that the anterior mandible shows a coarse cancellous bone texture. In this region, the trabeculae are thicker and fewer, and they tend to be oriented more horizontally, with relatively large marrow spaces between them. This combination creates a radiographic appearance that is less fine and more blocky compared with other jaw areas.

Why this is the best choice: it accurately describes a dense, load-bearing area where the trabeculae are thick and sparse, producing large marrow spaces and a coarse overall pattern. This contrasts with regions that have a finer, more numerous network of trabeculae or with areas that would lack cancellous bone.

The other descriptions don’t fit: a fine network of thin, numerous trabeculae with small marrow spaces doesn’t match the anterior mandible’s typical coarse texture; saying it’s the same as the posterior maxilla ignores regional differences in trabecular architecture; saying there is no cancellous bone is incorrect for the mandible.