Dental Upper limit of urinary mercury attributed to extensive amalgam restoration A 1 μg/g of creatinine B 3 μg/g of creatinine C 2 μg/g of creatinine D 4 μg/g of creatinine 💡 Explanation Upper limit of urinary mercury attributed to extensive amalgam restoration ✓ Correct Answer: D. 4 μg/g of creatinine