Enhanced mechanical properties are possible with urethane dimethacrylate-based experimental restorative dental composite

Abstract

This laboratory study aimed to replace the traditional bisphenol A-glycidyl methacrylate (bisGMA) resin system with a urethane dimethacrylate (UDMA)-based resin system to enhance the physicomechanical properties of dental restorative composite (DRC). We evaluated surface roughness, porosity %, nanohardness, elastic modulus, and compressive strength (CS) in the control group (the bisGMA-resin system) and two experimental groups (UDMA-based resin systems with 20 wt.% SiO2 or Al2O3, each 30 μm in size spherical fillers). Cylindrically shaped samples 4 mm in diameter and 6 mm in height were fabricated using light curing (n = 10). One-way analysis of variance method was used to statistically analyze the results (p ≤ 0.05). The data suggest that both UDMA-based resin systems showed increased surface roughness (Ra) and porosity % in the sample fabrication compared with the control. However, the nanohardness in both SiO2-based UDMA composite (0.20 ± 0.09 GPa) and Al2O3-based UDMA composite (0.22 ± 0.07 GPa) was not significantly higher compared with the control (0.19 ± 0.05 GPa). Likewise, while improved CS values were observed in both SiO2-based UDMA composite (15.5 ± 1.9 MPa) and Al2O3-based UDMA composite (16.2 ± 0.7 MPa) compared to the control (14.5 ± 4.5 MPa), this increase was not statistically significant. The newly developed UDMA-based resin formulation with Al2O3 micro-filler showed promising physicomechanical properties and may be appropriate for use as DRC.

Colour stability of resin infiltrated white spot lesion after exposure to stain-causing drinks

“…It has been found that resin consisting mainly of TEGDMA is the favoured alternative because a higher lesion penetration coefficient ( Paris et al, 2010 ). Nevertheless, TEGDMA has the highest water sorption rate, causing discoloration of resin ( Khan et al, 2020a , Khan et al, 2020b ). Thus, after storage in staining solutions, Icon became more discolored with the incorporation of the additional colorant.…”

Influence of Acidic Environment on the Hardness, Surface Roughness and Wear Ability of CAD/CAM Resin-Matrix Ceramics

“…Hence, our second null hypothesis was also rejected. Surface roughness is an important parameter and can promote plaque accumulation and initiation of secondary caries [ 13 ]. The higher surface roughness of VE compared to LU could be attributed to micro-structured SiO 2 fillers in VE and the nano-structured SiO 2 and ZrO 2 fillers in LU [ 31 ].…”

“…However, researchers have frequently used Vickers microhardness tests to determine the hardness of dental materials [ 12 ]. Surface roughness of a dental restorative material is also deemed a vital parameter for the longevity of restoration [ 13 ]. Rough surfaces can retain plaque and stains, making it difficult to maintain good oral hygiene.…”

Optimal resin monomer ratios for light-cured dental resins

“…For example, researchers studied the effect of barium glass content on the mechanical properties of the resins, found that the E of the resins improved with the increase of filler content, and the E of the resins could be as high as 3.9 GPa [ 16 ]. That the E of the resins could reach 4.6 ± 1.8 GPa and 5.2 ± 3.9 GPa with 20 wt% silica or aluminum oxides added [ 44 ]. The E in the article is even lower than most experimental values ( Figure 8 ) in our work which the E of most cured resins exceeds 4.6 GPa, even up to 5.96 GPa.…”