An implant placed in the lower second molar area — which of the following is NOT a risk in this location?

Correct answer: D. Proximity to the sinus

• A. Adequate bone height and width are real concerns for lower molar implants — this IS a risk.
• B. The mandibular foramen (where the IAN enters the mandible) IS relevant to lower molar implant placement — this IS a risk.
• C. The inferior alveolar nerve running through the mandibular canal IS a significant risk for lower molar implants — this IS a real risk.
• D. The MAXILLARY SINUS is NOT a risk for implants placed in the LOWER (mandibular) second molar area. The maxillary sinus is in the UPPER jaw (maxilla). Lower second molar implant risks include proximity to the inferior alveolar nerve, proximity to the mental foramen (though more anterior), and remaining bone height above the inferior alveolar canal.