Farhadian N, Mashoof RU, Khanizadeh S, Ghaderi E, Farhadian M, Miresmaeili A. Streptococcus mutans counts in patients wearing removable retainers with silver nanoparticles vs those wearing conventional retainers: A randomized clinical trial. Am J Orthod Dentofacial Orthop 2016;149:155–60.

An article in the February 2016 issue mentioned dietary intake of silver, but the wrong units were used. The sentence, on page 156 near the end of the Introduction, should read: “Dietary intake of silver is estimated at 70 to 90 μg per day.”