Study of applied nanostructured and conventional dental materials

Composite resins are the most modern, widespread, aesthetic and conservative materials in the field of direct restorative dentistry. During the last years, the manufacturers of dental materials have launched onto the market composite resins with inorganic nanofillers with diameter less than 100 nm. These materials are considered nowadays the state of the art in terms of filler formulation. Nanofilled and nanohybrid composite resins have been introduced fairly recently in the clinical practice, so that there is less information about their properties and clinical effectiveness in comparison to traditional materials. The present work of thesis examined in both the laboratory and clinical setting the performance of several composite resins with nanofillers. The following items were analysed in five different phases: 1) roughness and microhardness of nanohybrid composites; 2) sealing ability of a nanohybrid flowable composite; 3) influence of finish line on the marginal seal of nanohybrid composite crowns after periodontal scaling; 4) two-year in vitro and in vivo evaluation of surface roughness of a flowable nanohybrid composite; 5) clinical effectiveness of nanofilled and nanohybrid composite resins: a systematic review.