Effect of light curing units on the polymerization of bulk fill resin-based composites

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

“…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).…”

“…Better repair bond strength values achieved by Elipar DeepCure-S light source in comparison to Valo light source may be explained by the fact that Elipar DeepCure-S produces a more collimated and uniform beam profile with a special fiber transmission system. Additionally, Elipar DeepCure-S light device has a single-profile wavelength with less energy and the bulk-fill composite used contained camphorquinone as the sole photoinitiator, resulting in absorption of all of the light and used for polymerization and better bonding (28,30). Finally, Elipar DeepCure-S showed the greatest light intensity (1470 mw/cm²) values among the light devices studied and this may have affected the results.…”

Light curing matters: Facts often overseen by dentists

“…Another aspect that cannot be neglected is that different curing lights have different light tip sizes. The light tip diameter of the curing lights in the market are between 7 and 12 mm [19,20]. Usually fiber optic guides vary from 7 to 9 mm in diameter [19], while quartz lenses such as used in the VALO Cordless and VALO Grand (Ultradent, South Jordan, UT, USA) are 10 and 12 mm in diameter, respectively [19,20].…”

A comparative study of bulk-fill composites: degree of conversion, post-gel shrinkage and cytotoxicity

“…It is relevant to know the detailed protocol in the elaboration of the specimens, as several studies mention that the photopolymerization continues up to 24 hours immersed in distilled water for 24 hours at 37°. 2,3,4 On the other hand, to evaluate the volumetric contraction, a hemisphere was used considering the isotropic and homogeneous properties of the resins . A property of isotropy and homogeneity could be considered if the diameter of the light curing unit covers the whole hemisphere, since it influences the degree of conversion and the distribution of light in a homogeneous way.…”

“…A property of isotropy and homogeneity could be considered if the diameter of the light curing unit covers the whole hemisphere, since it influences the degree of conversion and the distribution of light in a homogeneous way. 3) If the tip does not cover the entire sample, there will be spaces that can not be measured, generating a slant in the results. Finally, the inorganic particle size was considered the main cause of the degree of conversion.…”