Influence of Dimethacrylate Monomer on the Polymerization Efficacy of Resin-Based Dental Cements—FTIR Analysis

Abstract

The degree of polymerization for dimethacrylate resin-based materials (BisGMA, TEGDMA, UDMA, HEMA) ranges from 55 to 75%. Literature data indicate that polymerization efficacy depends, among other factors, on the type of methacrylate resin comprising the material. The aim of this study was to evaluate the polymerization efficacy of four dental cement materials characterized by different polymerization mechanisms using FTIR analysis. In the present study, the FTIR method was adopted to analyze the degree of polymerization efficacy of four resin-based dental cement materials, two of which were self-cured and two were dual-cured cements. The IR spectral analysis was performed 24 h after the polymerization of the cementitious material. RelyX ARC cement exhibits the lowest polymerization efficacy (61.3%), while that of Variolink II (85.8%) and Maxcem Elite is the highest (90.1%). Although the efficacy of self-cured cements appears to be superior, the difference is not statistically significant (p = 0.280). Polymerization efficacy largely depends on the chemical structure of the material in terms of the presence of a particular methacrylate resin and less on the polymerization mechanism itself, i.e., whether it is a self-cured or dually cured dental cement. Thus, in clinical practice, cementitious materials with a higher proportion of TEGDMA compared with BisGMA are recommended.

pH-Responsive Hyperbranched Polymer Nanoparticles to Combat Intracellular Infection by Disrupting Bacterial Wall and Regulating Macrophage Polarization

“…After hydrolysis of PCA3 in DMSO/HCl for 6 h, acetal protons disappeared, but aldehyde proton was observed at about 9.7 ppm, indicating that CA could release from the hydrolytic degradation of PCA3. Figure D displays the FTIR spectrum of PCA3, and valence N–H, CO, and N–C vibrations occurred at peak positions about 2953, 1733, and 1046 cm –1 , respectively. , To further investigate the effect of polymer molecular weights on its antimicrobial activities, four kinds of PCA with different molecular weights were prepared. The average molecular weights were 3144 g/mol (PCA1), 4604 g/mol (PCA2), 6351 g/mol (PCA3), and 17478 g/mol (PCA4), respectively, and polydispersity was about 1.2 (Figure S2).…”

Determination of the degree of conversion, the diffuse reflectance, and the color stability after different aging processes of gingiva‐colored composite resins

“…Low conversion reduces the biocompatibility of the material due to the increased leaching of unbound molecules 9 . The present research used FTIR spectroscopy because this technique is known to provide more reliable results and is widely used to determine the DC from the $$C\; = \;C$$ bond vibrations measured before and after polymerization 25 . Light‐cured dental composites typically show limited conversion, with DC values ranging from 40% to 80% 12 .…”

“…9 The present research used FTIR spectroscopy because this technique is known to provide more reliable results and is widely used to determine the DC from the C = C bond vibrations measured before and after polymerization. 25 Light-cured dental composites typically show limited conversion, with DC values ranging from 40% to 80%. 12 The degree of polymerization for AG showed lower values.…”

“…The chemical composition of the composites was examined under attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) before and after polymerization. 25 IR spectra of the samples were gathered with a Nicolet iS50 FTIR spectrometer (Thermo Fisher Scientific Inc., USA) fit with an ATR accessory (Smart iTX, Thermo Fisher Scientific Inc., USA). Samples were placed on the ATR crystal plate and scanned at room temperature from 500-4000 cm −1 in absorbance mode with a 4 cm −1 resolution.…”

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

“…This could be due to the lower concentration of the additives used in the current study compared to the previous studies. The ability of a material to polymerize upon chemical activation is also essential for core build-up materials to promote adequate polymerization in the deep cavity where light transmission is limited [ 56 ]. The results showed that all experimental materials exhibited similar DC upon self-curing regardless of the level of additives.…”