Influence of different fillers on the properties of an experimental vinyl polysiloxane

Abstract

The aim of the study was to evaluate the effect of the incorporation of different fillers on an experimental vinyl polysiloxane (VPS) at two different concentrations, 20% and 40%. Different fillers were added to an experimental VPS. The study was developed in two stages: (i) incorporation of fillers in different concentrations: (a) 20 wt% fillers, and (b) 40 wt%. The fillers were added to experimental VPS and mixed with a speed mixer; (ii) characterization of experimental VPS; after the base paste and catalyst paste were mixed, the experimental VPS was used to make specimens specifically for each test, which were stored at 23°C for 24 hours. The tests were designed according to the specific standardization for the analysis of tensile strength, detail reproduction, Shore A hardness, and elastic recovery. For analysis of filler size pattern, scanning electron microscopy at 1500× magnification was used. The aerosil OX-50 40% (AE), and pure aluminum hydroxide 40% (PAH) groups presented the highest tensile strength and Shore A hardness values. However, those were the only groups that did not present continuous detail reproduction of an intersection of 20 μm line. The elastic recovery was not statistically significant. The undesirable characteristics of VPS (lowest Shore A hardness and tensile strength) were observed when it was added to the composition of acrylic polymer (AP) and fiberglass (FG) in both concentrations, 20% and 40%. In groups AE and PAH, agglomerates of nanofillers were shown in SEM micrography, while the other groups presented different shapes and fillers sizes.

Tantalum oxide as filler for dental adhesive resin

“…Many modifications have been proposed in the adhesive resins to contribute to the longevity of the restorative treatments [4][5][6] . A current trend involves the incorporation of inorganic fillers to decrease the relative amount of organic phase, providing a higher hydrolytic stability to resin and a reliable cavity seal [7][8][9][10][11][12] . Besides physical and chemical properties, the addition of inorganic fillers may increase the radiopacity.…”

Investigation of dental elastomers as oral mucosa simulant materials

“…As seen in Figure 4 SEM images of Vertex Soft and Dental Gum have smooth fractured surfaces under tension indicating the absence or minimal filler particle content. Meincke et al (2016) reported that polymethyl methacrylate based elastomers have less affinity and less surface activity in comparison with other elastomers with filler contents (Meincke et al, 2016). Dental elastomers tested in the current study which contained fillers showed a higher tensile strength and rougher surface at the fracture interface under tension.…”

“…and Algin-X Ultra material showed a rough surface SEM with some filler particles being "plucked" from the opposing surface (Figure 4). This may indicate the lack of bonding between filler particles and base elastomer matrix (Klingender, 2008;Meincke et al, 2016). Meincke et al (2016) reported this to be common in silicone materials; fillers must make intimate contact with the elastomer chains if they are going to contribute to reinforcement of the polymer.…”

Characterization and Biodegradability of Rice Husk-Filled Polymer Composites

“…Figure 5 shows the surface morphology of TPRH and TPS with irregular ( Figure 5 a) and spherical ( Figure 5 b) shape, respectively. The TPS granules with spherical shape caused a reduction in the contact area of the polymer matrix when compared with the irregular shape of TPRH [ 52 ]. For bare polymers of PBS ( Figure 6 a) and PBAT ( Figure 6 b), smooth surface morphology was observed while with filler loading, a rough surface was observed as shown in Figure 6 c–f.…”