Polymerization volume change (PVC) was measured systematically using mercury dilatometry for 41 epoxide and methacrylate monomers with quartz filler. Quantitative structure-property relationship (QSPR) models were developed based on this previously unreported data to gain insight into the data collection method for future models. Successful models included only data from those samples which were polymerized to hardness. The most significant descriptors in these models were related to monomer reactivity. In contrast, PVC data collected under experimental conditions which maximized monomer conversion resulted in descriptors describing size and branching, indicating that conversion must be considered for future PVC measurements. A rule of mixtures (ROM) correction term improved the correlations of the dilatometer data with varying quartz content, and an adjustment for conversion may similarly enable inclusion of data which had not polymerize to hardness. (c) 2006 Elsevier Ltd. All rights reserved.