Resumo

MORADAS ESTRADA, M  e  ALVAREZ LOPEZ, B. Dynamics of polymerization focused on reducing or preventing the stress of contraction of the current composite resins. Bibliographic review. Av Odontoestomatol [online]. 2017, vol.33, n.6, pp.261-272. ISSN 2340-3152.

In recent years, composite resins have been improved in terms of wear, aesthetics and other physical properties. The major problem persists with composite resins is that these materials shrink during polymerization. Contraction means densification or loss of volume. In the dental cavity this loss of volume compromises the integrity of the interface between resin and tooth, which favors the formation of cracks with the risk of hypersensitivity, recurrence of caries or even fracture of the restoration. This article presents the current knowledge about the polymerization contraction knowledge of the composite resins and its relation to the type of polymerization lamp. Also the concepts of obscure phase, hygroscopic expansion, the consequent stress of contraction or the new materials that are presumed devoid of contraction are developed, all this in the frame of the logical and normal dynamics carried out at the time of making a seal using composite resins, regardless of their filler or particle thereof. Regarding the sources of polymerization, both conventional halogen lamps and high power density lamps, such as LEDs, offer a gradual increase in light intensity, which is very useful to decrease the volume shrinkage of the material.

Palavras-chave : Operative dentistry; microleakage; dye penetration; stress contraction resin; polimerization light.

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