Effects of Sr/F-Bioactive Glass Nanoparticles and Calcium Phosphate on Monomer Conversion, Biaxial Flexural Strength, Surface Microhardness, Mass/Volume Changes, and Color Stability of Dual-Cured Dental Composites for Core Build-Up Materials

Abstract

This study prepared composites for core build-up containing Sr/F bioactive glass nanoparticles (Sr/F-BGNPs) and monocalcium phosphate monohydrate (MCPM) to prevent dental caries. The effect of the additives on the physical/mechanical properties of the materials was examined. Dual-cured resin composites were prepared using dimethacrylate monomers with added Sr/F-BGNPs (5 or 10 wt%) and MCPM (3 or 6 wt%). The additives reduced the light-activated monomer conversion by ~10%, but their effect on the conversion upon self-curing was negligible. The conversions of light-curing or self-curing polymerization of the experimental materials were greater than that of the commercial material. The additives reduced biaxial flexural strength (191 to 155 MPa), modulus (4.4 to 3.3), and surface microhardness (53 to 45 VHN). These values were comparable to that of the commercial material or within the acceptable range of the standard. The changes in the experimental composites’ mass and volume (~1%) were similar to that of the commercial comparison. The color change of the commercial material (1.0) was lower than that of the experimental composites (1.5–5.8). The addition of Sr/F-BGNPs and MCPM negatively affected the physical/mechanical properties of the composites, but the results were satisfactory except for color stability.

An in vitro assessment of biaxial flexural strength, degree of monomer conversion, color stability, and ion release in provisional restorations containing Sr-bioactive glass nanoparticles

“…The powder phase contained boroaluminosilicate glass (50 nm, 0.7 µm, and 7 µm in diameter, Esstech, Essington, PA, USA) with added 10 wt% Sr-BGNPs. The decision to use 10 wt% was based on the outcomes of similar composite formulations used for preparing core build-up materials [ 20 ]. The study demonstrated that adding 10 wt% Sr-BGNPs resulted in superior ion release but with acceptable strength compared to formulations containing 5 wt% Sr-BGNPs.…”

Assessment of Mechanical/Chemical Properties and Cytotoxicity of Resin-Modified Glass Ionomer Cements Containing Sr/F-Bioactive Glass Nanoparticles and Methacrylate Functionalized Polyacids

“…FTIR spectra of the bottom surface of the specimens were recorded before and after light-curing. The DC was calculated using the following equation [34]:…”

Effect of carbonated beverages on flexural strength of composite restorative material

“…The maximum stress encountered within a material at its moment of yield is represented by its flexural strength, which is quantified in terms of stress. [ 1 2 ] As a result, flexural strengths for the same material are frequently higher than tensile values. [ 3 4 5 ]…”