What is the minimum mesio-distal bone width required for implant placement between two natural teeth?

Correct answer: B. 7mm

• A. ❌ 9mm exceeds the minimum — more space is better but this is not the minimum threshold.
• B. ✅ Correct. A minimum of 7mm of mesio-distal bone is required between two natural teeth for implant placement. This accommodates a standard implant (3.5–4mm diameter) with 1.5mm of bone on each side (minimum requirement).
• C. ❌ 3.5mm is insufficient — this would not allow adequate bone walls around the implant.
• D. ❌ 6mm does not meet the minimum requirement for bone walls around a standard implant.