Contraction (shrinkage) in polymerization. Part II. Dental resin composites
Polimery 2001, No 9, 590
SummaryA review with 78 references covering the linear and volumetric contraction producing internal stresses in photocured dental restorative resin composites. The stresses are partially reduced by the flow of resin, ingress of air bubbles, and absorption of water. Computer simulations allow to predict the directions of shrinkage vectors (Fig. 4). Polymerization shrinkage of (meth)acrylate monomers can be reduced by fillers (up to 80%, Table 4) or prepolymers added to the base monomer mix. Free-radical ring-opening polymerization of suitable monomers decreases volume contraction because some covalent bonds are cleft to give near Van der Waals bond distances.