Abstract
Details are given of a technique for measuring the residual monomer (RM) content of poly(methyl methacrylate) dental resins which has been modified to improve accuracy and to reduce time. The influence of water immersion on the RM content of different resin systems was investigated by measuring the contents in the resins and in the surrounding water between 1 and 48 h. The results showed that the RM content of the different resin systems varied considerably. Immersion in water reduced the content in an orthodontic resin but not as a consequence of the monomer leaching out into the water.
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