However, incremental placement of light-cure composite resin has the potential to create unwanted gaps and may reduce the strength of the restoration. 4 Additionally, shrinkage of the light-cured composite resin occurs during the elongation of the C=C chains into C-C chains, along with shrinkage of the space between the cavities and adhesive bonding. 5 Over time, this can lead to deterioration IntroductIonComposite resin is a popular material for restoring anterior and posterior teeth.It is increasingly used today because it offers a variety of color options that closely resemble natural tooth color. 1 Composite resins consist of four main components: the resin matrix (organic), filler particles (inorganic), a coupling agent (silane), and an initiator-accelerator system used for polymerization. 1Bisphenol A glycidyl methacrylate (Bis-GMA) and urethane dimethacrylate (UDMA) are frequently used as resin matrix monomers.These two monomers have reactive carbon double bonds (C=C) at each end of the monomer chain, which become single bonds and elongate during the polymerization process. 2 Curing during polymerization is a chemical drying process that enhances the strength and durability of a resin material. 2,3 There are two types of curing: light curing and self-curing.Light curing, or photopolymerization, is the process of hardening composite resin formulations activated by heat or light.In contrast, self-curing involves chemical reactions that occur during the mixing of powder and liquid, allowing the composite resin to harden without heat or light activation. 3 Light-cured composite resins are commonly created via an incremental technique in which 2 mm thick composite resin is gradually layered to ensure optimal light polymerization.
Fibryanto et al. (Thu,) studied this question.
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