687. Which of the following has the maximum faciolingual diameter of the crown__________? September 27, 2025 by Admin A. Decidous maxillary 2nd molar B. Decidous maxillary 1st molar C. Decidous mandibular 2nd molar D. Decidous mandibular 1st molar ✅ The correct answer is option A. Decidous maxillary 2nd molar.