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Is there correlation between polymerization shrinkage, gap formation, and void in bulk fill composites? A μCT study

Lauber José Dos Santos Almeida1, Karla Janilee de Souza Penha1, Ana Ferreira Souza1

  • 1Universidade Federal do Maranhão - UFMA, Department of Dentistry I, São Luís, MA, Brazil.

Brazilian Oral Research
|December 22, 2017
PubMed

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Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
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Total voids in concrete encompass gel water volume, capillary pores, and entrapped air. Gel water (retained within the cement hydration products) and physically entrapped or adsorbed water are significant for the hydration process. For complete hydration, it's estimated that the space needed for the products of a cubic centimeter of cement doubles. Capillary pores constitute the unoccupied space within the hydrated cement paste, with their size largely influenced by the water-to-cement...
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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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