Effect of nano SiO2 particles on the morphology and mechanical properties of POSS nanocomposite dental resins

Abstract

Nanocomposite dental resins composed of polyhedral oligomeric silsesquioxane nanocomposite matrix and 0, 0.5,1, 1.5 and 2 wt% nano SiO 2 as filler were prepared by light curing method. The nanocomposite resins were characterized by performing compressive, three-point flexure, nanoindentation and nanoscratch testings as well as optical microscopy and scanning electron microscope analysis. The effects of different nano SiO 2 contents were studied on compressive strength, flexural strength, hardness and resistance of composite resin. From the mechanical results, it was found that nano SiO 2 effectively enhanced the mechanical properties of the composite resins at low content. With the increase of the nano SiO 2 content, the mechanical properties decreased. It was attributed to the content of nano SiO 2 and dispersion of nanoparticles in matrix.

Longevity of direct diastema closure and recontouring restorations with resin composites in maxillary anterior teeth: A 4‐year clinical evaluation

“…In our study, the nano, harder and spherical silica-zirconia fillers in Estelite Asteria and barium glassceramic fillers in Ceram.x Spheretec might have enhanced surface smoothness, thereby increasing stain resistance, gloss retention, and color matching. 37 Regarding the color matching and translucency criteria, Essentia Universal (n = 34, 57.6 %) had significantly greater proportions of scores 2 and 3 than Estelite Asteria (n = 16, 25 %) and Ceram.…”

Effects of Filler Size on the Mechanical Properties of Polymer-filled Dental Composites: A Review of Recent Developments

“…However, some problems continue to persist, such as inadequate mechanical properties, water uptake, polymerisation shrinkage, and poor wear resistance of large occlusal restorations during use. 1,15,16 Dental composites fail because of surface and/or bulk cracks, degradation of the matrix and fillers, water uptake, and insufficient mechanical properties.…”

“…Recently, nano-composites were introduced as dental polymers. 1,2 Resin composites are widely used in dentistry as restorative materials, cavity liners, pit and fissure sealants, cores and buildups, inlays, onlays, crowns, veneers, denture teeth, provisional restorations, cements for single or multiple tooth prostheses and orthodontic devices, endodontic sealers, root canal posts, structured scaffolds, and plates and screws. [3][4][5] Excellent biocompatibility, superior aesthetic qualities as fillings, moderate cost compared with ceramics, and strong bonding ability to the tooth structure, make resin composite the preferred material in dental restorative applications.…”

“…[3][4][5] Excellent biocompatibility, superior aesthetic qualities as fillings, moderate cost compared with ceramics, and strong bonding ability to the tooth structure, make resin composite the preferred material in dental restorative applications. 1,6,7 Most dental composites consist of an organic matrix (polymer phase), inorganic fillers (dispersed phase) and interphase (coupling agent). 8 Usually, the organic matrix is based on methacrylates, epoxy and polyethylene.…”

POSS Dental Nanocomposite Resin: Synthesis, Shrinkage, Double Bond Conversion, Hardness, and Resistance Properties

“…The shrinkage and contraction stress properties were enhanced by using pre-polymerized clusters. In our studies [ 32 , 33 ], novel dental nanocomposites with BG (barium oxide glass powder) and nano SiO 2 fillers with different contents of methacryl POSS were developed, respectively. The polymerization shrinkage and mechanical properties were analyzed.…”