Water ageing of urethane dimethacrylate networks

Pomès, Benjamin; Derue, Isabelle; Lucas, Albert; Nguyen, Jean‐François; Richaud, Emmanuel

doi:10.1016/j.polymdegradstab.2018.06.003

Cited by 17 publications

(14 citation statements)

References 56 publications

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“…In general, degradation of CAD/CAM resin composites can be attributed to the direct attack towards the polymeric matrix, the leaching of filler particles, or the weakening of the bonding between fillers and matrix—addressing the silanisation [ 43 ]. Various examples exist for the hydrolysis of ester bonds that are present in the polymeric matrix of CAD/CAM resin composites [ 25 , 44 , 45 ]. Hence, it seems reasonable that at least some of the induced changes in Ce were due to degradation of the polymer matrix.…”

Section: Discussionmentioning

confidence: 99%

Acid Resistance of CAD/CAM Resin Composites

et al. 2022

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Acid resistance of CAD/CAM resin composites. Erosion-related tooth surface loss is closely related to acid exposure, such as contact with acidic beverages or disease-related reflux. As a result, dental restorations in affected patients are also exposed to acids, which indicates that the performance and longevity of a dental restoration is impacted by the acid resistance of the individually employed restorative materials. However, unlike for ceramic materials, the acid resistance of CAD/CAM resin composites is not commonly evaluated by the manufacturers, and no standardised test methods have yet been established. Against this background, the present in vitro study aimed to examine the long-term resistance of CAD/CAM resin composites (Brilliant Crios, Cerasmart, Grandio blocs, Lava Ultimate, Shofu Block HC) against three acidic media (tonic water, acetic acid, hydrochloric acid) as well as demineralized water and to investigate potential damage mechanisms. Changes in surface roughness (Sa) were detected by confocal laser scanning microscopy (CLSM), and changes in surface hardness were measured using Vickers hardness (HV). The damage mechanisms were analysed by scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) and micro X-ray computer tomography (µXCT). For each material, few changes in either Sa or HV were identified for at least one of the different media; for Cerasmart, the sharpest deterioration in surface properties was observed. SEM–EDS revealed leaching of barium, aluminium, and titanium from fillers in a 2 µm zone on the rough but not on the polished surface of the specimen. Within the limitations of the current study, it can be concluded that polished CAD/CAM resin composites can be recommended for clinical use in patients with erosive conditions.

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Section: Discussionmentioning

confidence: 99%

Acid Resistance of CAD/CAM Resin Composites

et al. 2022

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“…Still, this hydrogen bond, formed by the urethane proton donor group, is strong enough to increase the mechanical properties of dental composites [ 19 ]. Due to the more flexible nature, UDMA demonstrates a higher degree of conversion than Bis-GMA does and a higher morphological homogeneity [ 19 , 20 , 21 ].…”

Section: Discussionmentioning

confidence: 99%

An Evaluation of the Properties of Urethane Dimethacrylate-Based Dental Resins

et al. 2021

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Most of the dental materials available on the market are still based on traditional monomers such as bisphenol A-glycidyl methacrylate (Bis-GMA), urethane dimethacrylate (UDMA), triethyleneglycol dimethacrylate (TEGDMA), and ethoxylated bisphenol-A dimethacrylate (Bis-EMA). The interactions that arise in the monomer mixture and the characteristics of the resulting polymer network are the most important factors, which define the final properties of dental materials. The use of three different monomers in proper proportions may create a strong polymer matrix. In this paper, fourteen resin materials, based on urethane dimethacrylate with different co-monomers such as Bis-GMA or Bis-EMA, were evaluated. TEGDMA was used as the diluting monomer. The flexural strength (FS), diametral tensile strength (DTS), and hardness (HV) were determined. The impacts of material composition on the water absorption and dissolution were evaluated as well. The highest FS was 89.5 MPa, while the lowest was 69.7 MPa. The median DTS for the tested materials was found to range from 20 to 30 MPa. The hardness of the tested materials ranged from 14 to 16 HV. UDMA/TEGDMA matrices were characterized by the highest adsorption values. The overall results indicated that changes in the materials’ properties are not strictly proportional to the material’s compositional changes. The matrices showed good properties when the composite contained an equal mixture of Bis-GMA/Bis-EMA and UDMA or the content of the UDMA monomer was higher.

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“…Regarding the influence of pressure of polymerization on E ′ , the same trend could be noticed as for DC or T g . High pressure polymerization did not influence E ′ of pure UDMA polymer (Phan et al, 2015) because the bulk modulus in glassy state depends on cohesive energy density (Pascault et al, 2002) and is barely influenced by conversion degree in the range under investigation (Pomes et al, 2018). However, a positive influence of high pressure on E ′ was noticed and a high correlation were observed between DC and E' (R 2 = 0.812) and between E' and T g (R 2 = 0.889) (Fig.…”

Section: Discussionmentioning

confidence: 83%

Influence of polymerization pressure and post-cure treatment on conversion degree and viscoelastic properties of polymer infiltrated ceramic network

Pomès

Béhin

Jordan

et al. 2021

Journal of the Mechanical Behavior of Biomedical Materials

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This study aimed at determining an optimum polymerization pressure for Polymer Infiltrated Ceramic Network (PICN) blocks by characterizing the conversion degree (DC) and the viscoelastic properties of experimental PICN blocks polymerized at 90 • C under various high pressures followed or not by post-cure treatment (PC). Near infrared analysis and dynamic mechanical analysis were used to characterize DC and viscoelastic properties of sixteen PICN: one control (thermo-cured) and fifteen experimental groups (one thermo-cured followed by PC and fourteen high pressure polymerized PICN, in the range of 50-350 MPa without and with PC). Conversion degree of high pressure polymerized PICN blocks without post curing displays an optimum between 100 and 150 MPa resulting in an improved E ′ and T g . Post curing induces a higher DC with a controversial effect on thermomechanical properties. The results suggested that 100-150 MPa without PC is an optimum polymerization parameter, resulting in PICN blocks with significantly better DC, T g , E'.

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Water ageing of urethane dimethacrylate networks

Cited by 17 publications

References 56 publications

Acid Resistance of CAD/CAM Resin Composites

Acid Resistance of CAD/CAM Resin Composites

An Evaluation of the Properties of Urethane Dimethacrylate-Based Dental Resins

Influence of polymerization pressure and post-cure treatment on conversion degree and viscoelastic properties of polymer infiltrated ceramic network

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