Influence of N-(2-hydroxyethyl)acrylamide addition in light- and dual-cured resin cements

Franken, P.E.C.; Rodrigues, Stéfani Becker; Collares, Fabrício Mezzomo; Samuel, Susana Maria Werner; Leitune, Vicente Castelo Branco

doi:10.1016/j.jdent.2019.103208

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…Light-cured cements are activated in the presence of a visible light source using light-curing units (LCU) [ 68 ]. The CQ/TA complex is stimulated by visible light at wavelengths ranging from 420 up to 490 nm [ 69 ], although the light absorption peak is recorded at 470 nm ( Table 1 ) [ 52 , 53 ]. Regarding the light-curing reaction, blue visible light (at 470 nm) transmitted by a LCU is absorbed by the CQ/TA complex, involving three fundamental steps: (1) polymeric chain growth without restrictions, in which the monomer concentration and free radicals determine the kinetic reactions; (2) fast viscosity increase with restricted mobility of free radicals and an irreversible increase in the elastic modulus of the resin matrix (gel point); and (3) vitrification and end of the reaction with a high viscosity level [ 41 , 47 , 48 , 70 ].…”

Section: Resultsmentioning

confidence: 99%

A Scoping Review on the Polymerization of Resin-Matrix Cements Used in Restorative Dentistry

et al. 2023

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In dentistry, clinicians mainly use dual-cured or light-cured resin-matrix cements to achieve a proper polymerization of the organic matrix leading to enhanced physical properties of the cement. However, several parameters can affect the polymerization of resin-matrix cements. The main aim of the present study was to perform a scoping review on the degree of conversion (DC) of the organic matrix, the polymerization, and the light transmittance of different resin-matrix cements used in dentistry. A search was performed on PubMed using a combination of the following key terms: degree of conversion, resin cements, light transmittance, polymerization, light curing, and thickness. Articles in the English language published up to November 2022 were selected. The selected studies’ results demonstrated that restorative structures with a thickness higher than 1.5 mm decrease the light irradiance towards the resin-matrix cement. A decrease in light transmission provides a low energy absorption through the resin cement leading to a low DC percentage. On the other hand, the highest DC percentages, ranging between 55 and 75%, have been reported for dual-cured resin-matrix cements, although the polymerization mode and exposure time also influence the DC of monomers. Thus, the polymerization of resin-matrix cements can be optimized taking into account different parameters of light-curing, such as adequate light distance, irradiance, exposure time, equipment, and wavelength. Then, optimum physical properties are achieved that provide a long-term clinical performance of the cemented restorative materials.

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Section: Resultsmentioning

confidence: 99%

A Scoping Review on the Polymerization of Resin-Matrix Cements Used in Restorative Dentistry

et al. 2023

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“…In addition, light cured resin cement was preferred than dual cured owing to the latter's polymerization that involves free-radical initiators such as benzoyl peroxide that react with a tertiary amine. The amines form by-products during the polymerization reaction, which may cause a yellowish to brown discoloration, affecting the color stability of resin cements (14) .…”

Section: Discussionmentioning

confidence: 99%

Influence of thicknesses of different ceramic materials on water sorption of light cured resin cement (in vitro study)

Elsoud

Afify²

2021

Al-Azhar Journal of Dental Science

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Objectives: The aim of this research was to study the effect of different thicknesses of three ceramic materials on the water sorption of light cured resin cements. Materials and methods: A total of 60 ceramic disc specimens were divided into 3 groups (n=20) according to the type of ceramic into group (E): E.max CAD, Group (V): Vita Suprinity and Group (C): Celtra Duo. Each group was subdivided into 2 subgroups of different thicknesses; 0.4mm and 1mm thickness. Opaque light cured Bisco resin cement specimen was made of thickness 0.1mm controlled using a teflon mold and cured through each ceramic specimen then inserted into the dessicator inside an incubator. The specimens were repeatedly weighed after 24h intervals using analytical balance of accuracy 0.001 g until a constant mass (m1) was obtained. The water sorption for the seven days of storage in water was calculated and the data was collected, tabulated and statistically analyzed. Results: There was a significant difference between samples of different materials (p<0.001). The highest value was found with Emax samples (32.52±3.05) followed by Celtra Duo (24.88±2.35) while the lowest value was found with Vita Suprinity (23.36±2.39) while There was no significant difference between samples made with different thicknesses (p=0.376). Conclusion: There is a relationship between ceramic type and water sorption between the zirconia reinforced lithium silicates and lithium disilicate ceramic materials. Also, different ceramic thicknesses up to 1mm did not affect the water sorption of the light cured resin cement.

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“…As shown in Figure 1b,c, the aromatic hydrogen protons of DOPO appeared at 6.91-8.00 ppm [38]. There were three peaks at 6.26 ppm, 6.09 ppm, and 5.64 ppm corresponding to H in -CH=CH 2 from HEAA [49,50]. The peaks at 4.16 ppm and 3.60 ppm were attributed to H in the CH 2 -CH 2 structure.…”

Section: Characterizations Of Dopo-n and Vhntsmentioning

confidence: 91%

Flame-Retardant and Transparent Unsaturated Polyester Based on P/N Liquid Flame Retardants and Modified Halloysite Nanotubes

Dou,

Ju,

Zhong

et al. 2024

Materials

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Unsaturated polyester resin (UPR) with excellent flame retardant is mainly obtained by adding large amounts of flame retardants, usually at the expense of mechanical properties. In this work, a reactive flame retardant containing phosphorus and nitrogen (DOPO-N) was successfully synthesized and incorporated in UPR as a crosslinker. The mechanical and flame-retardant properties of UPR composites were enhanced. UPR/30DOPO-N passed a UL-94 V-1 rating with a limiting oxygen index (LOI) of 30.8%. The tensile strength of UPR/30DOPO-N increased by 24.4%. On this basis, a small amount of modified HNTs (VHNTs) was added to further improve the flame-retardant properties of the composite. With the introduction of 3 wt% VHNTs, the composite passed the UL-94 V-0 rating. The peak of heat release rate (PHRR) and total heat release (THR) of it decreased by 60.7% and 48.3%, respectively. Moreover, the detailed flame-retarding mechanism of DOPO-N and VHNTs was investigated by thermogravimetric infrared spectroscopy (TG-IR), Raman spectra, and X-ray photoelectron spectroscopy (XPS). It was found that DOPO-N played a role in quenching the flame in the gas phase and cooperated with VHNTs to enhance the barrier effect in the condensed phase.

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Influence of N-(2-hydroxyethyl)acrylamide addition in light- and dual-cured resin cements

Cited by 9 publications

References 35 publications

A Scoping Review on the Polymerization of Resin-Matrix Cements Used in Restorative Dentistry

A Scoping Review on the Polymerization of Resin-Matrix Cements Used in Restorative Dentistry

Influence of thicknesses of different ceramic materials on water sorption of light cured resin cement (in vitro study)

Flame-Retardant and Transparent Unsaturated Polyester Based on P/N Liquid Flame Retardants and Modified Halloysite Nanotubes

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