Abstract
The aim of this work was to find the influence of the addition of low amount of hydrophilic and hydrophobic TiO2 nanoparticles on compressive strength, microhardness and rheological properties of flowable dental composite material. Specimens were prepared by adding 0.05; 0.2 and 1 wt. % of hydrophilic and hydrophobic 20 nm TiO2 nanoparticles. These specimens were compared to non-modified control specimens in compressive strength and microhardness. Furthermore, their rheological properties were determined. The optimal nanoparticle loading was 0.2 % hydrophobic TiO2, resulting in significantly higher compressive strength and microhardness than those of the control specimen group. Mechanical properties of flowable composites reinforced with hydrophilic and hydrophobic TiO2 at higher loadings are lower than those of control specimens, which is the result of nanoparticle agglomeration. TiO2 nanoparticles addition resulted in the decrease in viscosity in all specimens except for the specimewn with 1% hydrophilic TiO2 nanoparticles. In accordance to the obtained results, hydrophobic nanoparticle addition results in a more resistant and durable material, combined with an increased flowability compared to a non-modified composite.
Highlights
A new trend of the widespread use of flowable composites in dental restorations was reported [1]
Efforts have been made to improve the mechanical properties of flowable composite resins by adding a small amount of nanoparticles [9,10,11,12,13,14]
Mechanical properties The compressive strength and microhardness results of control and modified samples with hydrophilic and hydrophobic TiO2 are shown in Figures 1a and 1b
Summary
A new trend of the widespread use of flowable composites in dental restorations was reported [1]. The first generation of flowable resin composites was introduced in 1996, in response to requests for easy handling properties [2,3] These properties allowed flowable resin composites to be used as liners in areas of difficult access, fissure sealants and restorations of small cavities [4,5,6]. Their application is restricted to non-stress-bearing areas, because of their lower mechanical properties compared to conventional resin composites with a higher viscosity [7]. Handling properties of flowable resin composites have included their malleability, ease of placement and shaping on the restored site, adherence to the tooth surface and not to an instrument and its holding shape or resistance to slumping [2,7]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
