What description BEST describes the osseous defects seen around tooth 29 on radiograph?

• A. Horizontal bone loss
• B. Vertical bone loss with infrabony pocket
• C. No bone loss
• D. Diffuse sclerosis

Answer: (B)

The key idea is recognizing patterns of bone loss on radiographs to distinguish vertical (angular) loss with an infrabony pocket from other patterns. In this radiograph, the bone loss is not uniform around the tooth but shows an angular defect along one aspect with the base of the defect located apical to the crest. That apical base and angular (triangular) radiolucency along the root is characteristic of an infrabony pocket, i.e., vertical bone loss. This differentiates it from horizontal bone loss, where the crest would recede evenly around the tooth; from no bone loss, which would show normal bone and lamina dura; and from diffuse sclerosis, which would appear as increased bone density rather than a radiolucent angular defect.