Reduced bone mineral density is most likely to compromise osseointegration in which of these conditions?

Correct answer: D. Osteopenia

• A. Focal osteosclerosis is a localised increase in bone density with no systemic significance and no reduction in mineral content.
• B. Fibrous dysplasia replaces normal bone with poorly organised fibro-osseous tissue and is generally avoided for implants, but the mechanism is disorganised architecture and expansion rather than a measured reduction in mineral density.
• C. Osteopetrosis is the OPPOSITE problem — a failure of osteoclastic resorption producing abnormally dense, brittle bone with obliterated marrow spaces. Implants fail there not from low density but from poor VASCULARITY, from overheating during the osteotomy in dense bone, and from a high risk of osteomyelitis. It is a genuine contraindication, but not because of reduced density.
• D. CORRECT. OSTEOPENIA is reduced bone MASS and mineral density that has not yet reached the osteoporosis threshold (T-score between −1.0 and −2.5). Lower density means poorer primary stability at placement and reduced bone-to-implant contact. Where OSTEOPOROSIS is not offered among the options — as the recall reports — osteopenia is the intended answer, since it is the same process at an earlier stage. Two caveats worth carrying: a DEXA result at the spine or hip does NOT reliably predict jaw bone quality, so this is a relative rather than absolute concern; and in these patients the far greater implant-related risk is ANTIRESORPTIVE THERAPY, not the density itself.

Note: ⚠️ The recall notes osteoporosis was absent from the option list, which is what makes osteopenia the key. Osseointegration failure in osteoporotic patients is attributed to reduced bone mass and density, but the skeletal diagnosis at one site does not necessarily reflect the maxilla and mandible. INTRAVENOUS bisphosphonate use is the finding that genuinely changes the plan.