Influence of P/L ratio and peroxide/amine concentrations on shrinkage-strain kinetics during setting of PMMA/MMA biomaterial formulations

The Effects of Light Intensity and Light-curing Time on the Degree of Polymerization of Dental Composite Resins

“…Except there be significant local porosity or defects in the specimen, local shrinkage typically translates into an observable macroscopic shrinkage 25) . In many cases, polymerization shrinkage in a composite resin has been reported to cause clinically significant problems.…”

“…1 Polymerization shrinkage in 1. p-values Z2 A 11.2 ± 0.5 9.3 ± 0.5 9.0 ± 1.0 11.6 ± 1.1 9.6 ± 0.5 7.6 ± 0.5 a<0.001 b<0.001 FP A 9.6 ± 1.3 9.5 ± 1.5 9.3 ± 0.6 11.0 ± 1.0 9.6 ± 1. Table 3 Maximum polymerization shrinkage (μm) in 1.5-mm-thick specimen under various light-curing conditions 25.2％ depending on the curing condition and product. Non-thermocycled specimens yielded statistically different thermal expansion coefficient values compared to the thermocycled specimens regardless of product.…”

Effect of oligomer length on the buckling of long and high aspect ratio microwalls UV embossed from oligomer/monomer mixtures

“…There have been numerous reports, including ours, of techniques for measuring dynamic polymerization shrinkage of UV resins, especially dental materials [24][25][26]. Fig.…”

“…Polymerization shrinkage arises from conversion of double carbon bonds as the double bonds and larger van der Waals intermolecular spacings are replaced by smaller intramolecular covalent bonds leading to density increase [24,27,28]. If the volume change per mole of acrylate is constant ( V C C ), a semi-empirical relationship of percentage relative volume change (S%) with conversion (x) in a mixture of multi-functional monomers can be expressed as [25]:…”

Modification of poly(methyl methacrylate) denture base materilas with diesters of itaconic acid

“…U slučaju polimerizacije metil-metakrilata (MMA) to skupljanje iznosi 21.1 %. Ovako veliko skupljanje pri polimerizaciji se prevazilazi prethodnim mešanjem praha polimetilmetakrilata (PMMA) sa monomerom MMA, čime se skupljanje redukuje 35 .…”