Curing, Monomer Leaching and Water Sorption of TEGDMA/BisGMA Photopolymerized Copolymers

Pinto, L. F.; Rigoli, Isabel C.; Neumann, Miguel G.; Cavalheiro, Carla Cristina Schmitt

doi:10.5935/0103-5053.20130068

Cited by 3 publications

(2 citation statements)

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“…In addition to the already discussed heterogeneity of Sh , the decreases in surface roughness Sa observed for Sh (M H2O , M TW , M HCl ) and La (M HCl ) in the respective media could also be explained by swelling. In the present study, this effect was limited due to the drying procedure before stressing the specimen: however, in general, it is well known for dental composites [ 28 , 40 , 41 ]. It is easy to imagine that when a relatively soft polymer matrix swells between rigid filler particles, the polymer matrix lifts due to the incorporation of solvent.…”

Section: Discussionmentioning

confidence: 93%

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: 93%

Acid Resistance of CAD/CAM Resin Composites

et al. 2022

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“…Water sorption is described as the absorption and diffusion of water into bonding agents' monomers, resulting in dimensional changes, softening, and plasticization of the cured polymer network. [ 4 ] This affects their physical and mechanical characteristics. While solubility of dental bonding agents is elucidated as the hydrolytic degradation of bonding agents' monomers in the presence of water, which is caused by a chemical reaction with water that can break the covalent bonds between polymer networks, resulting in the loss of monomer mass, which has an adverse impact on the mechanical characteristics and stability of the resin polymer network.…”

Section: Introductionmentioning

confidence: 99%

Long-term water sorption/solubility of two dental bonding agents containing a colloidal dispersion of titanium dioxide

Al-Abbas

Al-Badr²,

Shamash³

2023

J Adv Pharm Technol Res

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The aim was to analyze the influence of the incorporation of 4% by mass of colloidal dispersion of titanium dioxide (TiO 2 ) nanoparticles on the long-term water sorption and solubility of two commercial universal bonding agents. In vitro studies. A colloidal dispersion of TiO 2 nanoparticles was formulated and blended into two commercial dental bonding agents, i.e., Ambar Universal (FGM, Brasil) and G-Premio Bond Universal (GC, America) at 4% by mass. Forty bonding agent discs were fabricated and segregated into four bonding agent groups of 10 discs each, i.e., GA: Ambar Universal (control), GB: Ambar Universal (4% TiO 2 incorporated), GC: G-Premio Bond universal (control), and GD: G-Premio Bond (4% TiO 2 incorporated). The bonding agent discs were developed by dispensing the bonding agents into a silicone cast of 5 mm diameter and 1 mm depth. After bonding agent discs were desiccated, the cured discs were weighed and kept in distilled water to be evaluated for water sorption and solubility over 1 year storage period. Statistical analysis was performed by independent variable t -test performed using the IBM SPSS software (Chicago, IL: SPSS Inc). The incorporated bonding agent groups (GA and GB) showed significantly lower ( P < 0.05) water sorption and solubility following 1 year of water storage in comparison to the control bonding agents. Both GC and GD demonstrated remarkably lower water sorption and solubility than GA and GB. Incorporation of the colloidal dispersion of TiO 2 nanoparticles at 4% by mass into the universal bonding agents has significantly reduced their water sorption and solubility contrast to their control groups.

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Effect of the photoinitiator system on the properties of a dental material based on a hybrid polymer

Venter

Martim

Santos

et al. 2016

BDS

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Objective: In this study, the effects of two different cure protocols upon the properties of composites using a hybrid-polymer as dental resin were evaluated. Material and Methods: Two distinct dental composites were prepared, one containing a mixture of TEGDMA/bis-GMA (50:50) and, another containing a mixture of TEGDMA/p-MEMO (50:50), [p-MEMO: oligomeric inorganic precursor]. Both composites were polymerized with lucirin and canphorquinone as photoinitiators. The composites were made with a 70 % wt of inorganic filler. Flexural strength was evaluated with a universal test machine and the degree of conversion was measured by infrared spectroscopy. A helium pycnometer was used to obtain polymer shrinkage data. Sorption tests were performed and SEM microscopy was used to show deleterious effects upon the resins’ surfaces. Results: The sample base on TEGDMA/p-MEMO polymerized with lucirin (L-T/p) showed the best values of the monitored properties. Conclusion: Lucirin is the most suitable photoinitiator for dental composites containing hybrid polymers.KeywordsDental resins; Flexural strength; Hybrid polymer; Photoinitiator system; Polymerization shrinkage.

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Curing, Monomer Leaching and Water Sorption of TEGDMA/BisGMA Photopolymerized Copolymers

Cited by 3 publications

References 0 publications

Acid Resistance of CAD/CAM Resin Composites

Acid Resistance of CAD/CAM Resin Composites

Long-term water sorption/solubility of two dental bonding agents containing a colloidal dispersion of titanium dioxide

Effect of the photoinitiator system on the properties of a dental material based on a hybrid polymer

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