Green LED as an Effective Light Source for Curing Acrylate-Based Dental Resins in Combination with Irgacure 784

Abstract

Low intensity green light emitting diodes (LED) were shown to be an effective light source to induce the photopolymerization of an acrylate-based photocurable dental restorative resin mixture of bisphenol A glycerolate dimethacrylate (BisGMA), triethylene glycol dimethacrylate (TEGDMA), and diurethane dimethacrylate (UDMA), in combination with fluorinated diaryl titanocene (Irgacure 784). Dental matrices were prepared by the LED light source at different intensities. The mechanical properties, such as Vickers microhardness, compressive strength, diametric tensile strength, flexural strength, and -modulus of the created samples, were investigated. The kinetics of the photopolymerization was followed by Raman spectroscopy and conversion values were determined. It was found that, despite its narrow-emission range centered at a wavelength of 531 nm, the green LED light source is suitable for the preparation of dental matrices with good mechanical properties and high conversion values.

Optimization of Plasmonic Gold Nanoparticle Concentration in Green LED Light Active Dental Photopolymer

“…The normalized UV–VIS transmittance spectra of the Au1 sample and AuNP in toluene are shown in Figure 2 . The spectral feature of the green LED light source and the Ref samples were shown in our previous paper [ 16 ].…”

“…It can be seen in Figure 2 , that the first peak of sample 2, around 460 nm, originates from the photoinitiator [ 16 ]. According to our previous results, the LED light source could enhance the photopolymerization because it emits light in the region where the initiator absorbs the light [ 16 ].…”

“…In our experiments, we used an LED light source (Megaled, 3W green power LED, Budapest, Hungary) to polymerize the resin matrix. The LED light source was described in our previous study [ 16 ]. The optical spectra of the light source were measured by fiber optical spectrophotometer (Ocean Optics, USB650, Dunedin, FL, USA).…”

“…The crosshead speed was 1.00 mm/min. The DTS strength data were calculated based on MSZ EN ISO 604:2003 [ 16 ].…”

“…However, the resonant excitation of gold nanoparticles requires different wavelengths of light than those used in the dental photocuring system (blue light). Consequently, we have constructed a green-emitting LED curing unit, and our device required a photoinitiator sensitive to the wavelength of 532 nm of green light [ 16 ]. For this reason, the well-known and widely applied Irgacure 784 photoinitiator was chosen for these studies [ 17 ].…”