The matter of polymerization shrinkage in dentistry applications is critical, causing the restoration material to grow distant or detach from the dental cavity walls. The consequent rupture would lead to marginal microleakage which is responsible for additional issues such as secondary caries and post-operative sensibility. The goal of this study is to experimentally develop new composites through the addition of clay mineral (phyllossilicate) nanocomponents into a polymeric matrix composed of BisGMA/TEGMA, so that the possibility of a different shrinkage behavior to take place during polymerization may be evaluated. Also, the performance of three different commercial nanoparticle resins shall be assessed. The materials to be added to the polymeric matrices are clay mineral nanoparticles MMT Cloisite 20A® and Cloisite 302B® (with weight fractions of 50, 60 and 70%). The commercial resins to be tested are Filtek Z350 XT (3M ESPE), Evolu-X (Dentsply) and Carisma Diamond (Heraeus Kulzer). The characterization methods shall be scanning electron microscopy (SEM), Thermomechanical Analysis (TMA), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Fourrier-Transform Infra-Red Spectroscopy (FTIR), X-Ray Diffraction (XRD), Polymerization Stress Testing, Holographic Interferometry (HI), Digital Holography (DH) and Digital Image Correlation (DIC).
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