We read the article "Lingual retainers bonded without liquid resin: A 5-year follow-up study" in the January 2013 issue of the AJ0-D0 with great interest (Tang ATH, Forsberg CM, Andlin-Sobocki A, Ekstrand J, Hagg U. Am J Orthod Dentofacial Orthop 2013;143:101-4). The authors are to be commended for their work to evaluate the effect of excluding the liquid resin component of a composite bonding product that is based on bisphenol A diglycidylmethacrylate when bonding lingual retainers. However, we have 2 concerns regarding this article.
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