The minimum mesiodistal distance required between two natural teeth to place a dental implant is:

Correct answer: C. 7 mm

• A. INCORRECT. 3 mm is the minimum distance recommended between an implant and adjacent natural teeth (implant-to-tooth distance), but this does not represent the total space between two natural teeth for implant placement.
• B. INCORRECT. 5 mm may be the minimum space for a small-diameter implant but is generally insufficient for a standard-diameter implant when accounting for the required 1.5 mm biological space on each side.
• C. CORRECT. A minimum of 7 mm of mesiodistal space between two natural teeth is generally required for standard implant placement. This accommodates the implant diameter (~4–5 mm) plus at least 1.5 mm of clearance from each adjacent tooth to preserve the periodontal attachment and alveolar bone of neighboring teeth.
• D. INCORRECT. 10 mm of space between teeth would accommodate an implant but is more than the minimum requirement. Such space might be present in patients missing multiple teeth or with larger edentulous spans.