![]() Composites can also be used as cements to cement crowns and veneers, etc. Just like dental amalgam, they are used to restore tooth structure lost through trauma, caries, or other diseases. Ru Qing Yu, in Encyclopedia of Biomedical Engineering, 2019 Compositesĭental composites, or resin-based composites, are synthetic materials that combine polymeric matrix with a dispersion of glass, mineral, or resin filler particles and/or short fibers by coupling agents. The hydrolytic sensitivity of the available systems compromising mechanical strength and fracture toughness remains an unsolved problem that has to be approached. To explore possible enhancement of the mechanical properties of resin composites, strong electric fields are investigated inducing an alignment of filler particles and, thus, increasing the mechanical properties of filler-reinforced systems. Glass and Kevlar continuous fiber-reinforced thermoplastics are being developed for specific applications, e.g., prosthodontic frameworks and orthodontic retainers, however, these still require considerable improvement of the interfacial stability. A shrinkage-free composite with a good wetting ability is highly desired to simplify the operative technique and is the object of ongoing research. For these reasons, an advanced operative technique is necessary. During polymerization the shrinkage forces can reach 3–7 MPa with peaks of 30 MPa. The shrinkage of modern dental composite materials amounts to 2–3 vol.%. They are still sensitive to humidity during processing in the oral cavity. To achieve bonding to enamel and dentin, a surface pretreatment is necessary. Goehring, in Encyclopedia of Materials: Science and Technology, 2001 2.3 Prospectsĭental composites are hydrophobic in relation to human dental tissues.
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