Degree of conversion of resin‐based materials cured with dual‐peak or single‐peak <scp>LED</scp> light‐curing units

Lucey, Siobhan M.; Santini, Ario; Roebuck, Elizabeth M

doi:10.1111/ipd.12104

Cited by 19 publications

(16 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Time‐saving procedures are an ongoing demand for restorative applications, especially for non‐cooperative patients, recently; significant improvements have been made in LED dental curing unit technology to allow for shorter clinical application times. Although the curing efficiency of new‐generation LED LCUs has been generally investigated for composite resins, there is little information available about their performance with other resin‐containing restorative materials.…”

Section: Discussionmentioning

confidence: 99%

Effect of a third‐generation LED LCU on microhardness of tooth‐colored restorative materials

Gönülol

Özer

Tunç

2015

Int J Paed Dentistry

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of a third‐generation LED LCU on microhardness of tooth‐colored restorative materials

Gönülol

Özer

Tunç

2015

Int J Paed Dentistry

View full text Add to dashboard Cite

show abstract

“…The spectra were processed with FORAM PC‐software. The DC calculations were performed by comparing the relative change of the band at 1640 cm −1 , representing the C = C stretch to the aromatic C = C reference band peak height at 1610 cm −1 , which remained unchanged during the reaction as described in the following equation:

normalD normalC % = (|, 1 - \frac{normalc normalu normalr normale normald (|, normalp normale normala normalk normalh normale normali normalg normalh normalt normalu normaln normald normale normalr 1640 / normalp normale normala normalk normalh normale normali normalg normalh normalt normalu normaln normald normale normalr 1610)}{normalu normaln normalc normalu normalr normale normald true(normalp normale normala normalk normalh normale normali normalg normalh normalt normalu normaln normald normale normalr 1640 / normalp normale normala normalk normalh normale normali normalg normalh normalt normalu normaln normald normale normalr 1610 true)}) \times 100

…”

Section: Methodsmentioning

confidence: 99%

Degree of conversion and cross‐link density within a resin‐matrix composite

et al. 2017

View full text Add to dashboard Cite

The aims of this study were to profile light radiated from two light-curing units (LCUs) and evaluate profile relationship to polymerization patterns within a resin-matrix composite (RMC). Beam profiles of one multiple emission peak light-emitting-diode and one quartz-tungsten-halogen curing-unit were measured using a beam profiler/spectrometer system. A camera-based profiler and an integrating sphere/spectrometer assembly were used to evaluate each LCU beam. Polymerization patterns within a nano-hybrid RMC were investigated using a mapping approach by assessing the degree of conversion utilizing micro-Raman spectroscopy and indirectly estimating cross-link-density by repeated microhardness testing before and after exposure to ethanol (%KH reduction, n = 3). The irradiance received on the top and bottom specimen surfaces from both LCUs was measured using a MARC-RC system. The investigated beam profile area from both LCUs was non-uniform and yielded localized discrepancies in DC (55.7-74.9%) and %KH reduction (26.7-54.1%). The LCU irradiance received at the bottom of the specimens was ∼10% of the top value. This study demonstrated that LCU beam profiles were non-uniform in the area explored. Localized differences in DC and %KH reduction existed throughout the RMC specimens but did not follow a specific pattern. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1496-1504, 2018.

show abstract

“…Photochemically, since shorter wavelength photons have more energy, it was suggested that photons will not be absorbed by the chemical initiators which do not exactly match the absorption spectrum and will be scattered (27,28). In a study by Lucey et al (29) where they evaluated the effect of second-and third-generation LED light sources on the degree of conversion (DC) of various restorative materials, best DC values were obtained when the composite was polymerized with the second-generation LED light source using camphorquinone as the photoinitiator. Shimokawa et al (30) In contrast to those studies, no significant difference was noted between the monowave and polywave LED light curing units (Elipar S10 and Bluephase G2) in the degree of conversion of different bulk fill composites (31).…”

Section: Discussionmentioning

confidence: 99%

Effect of Light Sources on Bond Strength of Different Composite Resins Repaired with Bulk-Fill Composite

Kılıç

Hürmüzlü

2020

Odovtos - Int J Dent Sc

View full text Add to dashboard Cite

The aim of this study was to evaluate and compare the effects of different light sources on shear bond strength when bulk-fill composite was used for the repair of different composite resins. A total of 126 samples made from six resin composites with different properties were aged (thermal-cycling with 5000 cycle), exposed to the same surface treatments and adhesive procedure. Then, they were repaired with a bulk-fill composite. At the polymerization step, each group was divided into three subgroups (n=7) and light cured with a QTH light source for 40s and two different LED light sources for 20s. Subsequently, the specimens were aged in distilled water at 37 ºC for 4 weeks and then subjected to shear bond strength test. Then, the specimens were examined under a stereomicroscope to identify modes of failure and visualized by Scanning Electron Microscope. Data obtained from the study were analyzed using ANOVA and Tukey HSD Test (α=0.05). In all groups, the light curing units had an impact on shear bond strength (p<0.05). Among the study groups, the greatest bond strength values were observed in the specimens repaired using the LED and the specimens repaired with the QTH light curing unit had the lowest bond strength values. It was concluded that the content of composite resins and light curing units may influence bond strength of different composites repaired with the bulk-fill composite.

show abstract

Degree of conversion of resin‐based materials cured with dual‐peak or single‐peak LED light‐curing units

Abstract: Dual-peak LED LCUs may not be best suited for curing non-Lucirin(®) TPO-containing materials. A clear sealant showed a better cure throughout the material and may be more appropriate than opaque versions in deep fissures.

Cited by 19 publications

References 29 publications

Effect of a third‐generation LED LCU on microhardness of tooth‐colored restorative materials

Effect of a third‐generation LED LCU on microhardness of tooth‐colored restorative materials

Degree of conversion and cross‐link density within a resin‐matrix composite

Effect of Light Sources on Bond Strength of Different Composite Resins Repaired with Bulk-Fill Composite

Contact Info

Product

Resources

About