Effect of Inhomogeneity of Light from Light Curing Units on the Surface Hardness of Composite Resin

Arikawa, Hiroyuki; Kanie, Takahito; Fujii, Koichi; Takahashi, Hideo; Ban, Seiji

doi:10.4012/dmj.27.21

Cited by 48 publications

(55 citation statements)

References 13 publications

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“…However, the shape of filler particles, as well as particle size and filler content, can significantly affect the light transmittance characteristics 19) . Apart from filler properties, Emami et al suggested that the characteristic of incident light also affected light absorbance by dental composites 20) .…”

Section: Discussionmentioning

confidence: 99%

Examination of composite resins with electron microscopy, microhardness tester and energy dispersive X-ray microanalyzer

Vilchis¹,

Hotta²,

Hotta³

et al. 2009

Dent. Mater. J.

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This study was conducted to examine the ultrastructures of eight recently improved light-cure restorative composite resins with scanning and transmission electron microscopes (SEM and TEM). Additionally, Vickers hardness, volume/weight fraction of filler, and chemical composition were analyzed. Composite resins selected for evaluation were Beautifil II, Clearfil AP-X, Clearfil Majesty, Estelite Σ, Filtek Supreme, Filtek Z250, Solare, and Synergy. SEM and TEM images revealed a great diversity in ultrastructure, and Vickers hardness test showed significant differences amongst all the composite resins (except between Clearfil Majesty and Estelite Σ, and between Filtek Supreme and Filtek Z250). By means of EDX, similar elements such as C, O, and Si were detected, but the concentration was different in every composite resin. Results obtained in this study served to validate that the methods employed in this study -SEM and TEM at high magnification -were useful in examining the ultrastructures of composite resins. It was also found that the ultrastructure, size of filler particles, volume/weight fraction of filler, and chemical composition of the composite resins had an effect on Vickers hardness. Given the great diversity of ultrastructures amongst the composite resins, which stemmed from the different revolutionary technologies used to manufacture them, further studies are warranted in the search of clinical applications that optimally match the differing properties of these materials.

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Section: Discussionmentioning

confidence: 99%

Examination of composite resins with electron microscopy, microhardness tester and energy dispersive X-ray microanalyzer

Vilchis¹,

Hotta²,

Hotta³

et al. 2009

Dent. Mater. J.

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show abstract

“…The light from the light guide tip was conducted through the optical fiber, and the light intensity was measured using the power meter. The end of the optical fiber was mounted on a miniature X-Y axis stage, and was scanned at 1.0-mm intervals across the face of light guide tip, and measured light intensity at each point, which was shown in previous study 6) . The light intensity was evaluated as the relative intensity to the maximum value for each LCU.…”

Section: Radiation Light Intensity Distributionmentioning

confidence: 99%

“…To assess the effect of the inhomogeneous radiation light on the material, the hardness distribution on the surface of material directly irradiated by the radiation light was measured 6) . A commercial light-activated composite resin (Lite-Fil II A, A3, Shofu Inc., Kyoto, Japan) was used for the test material.…”

Section: Surface Hardness Testmentioning

confidence: 99%

“…Recently, other study also showed 3D views of light beam profile from dental LCUs, and concluded that the irradiance at the light guide tip end of a wide variety of LCUs was not radically symmetrical and could be quiet inhomogeneous 7) . Moreover, the inhomogeneous radiation light resulted in an undesirable non-uniform polymerization on the surface of the resin material 6) , which can lead to a reduced curing depth, diminished physical and mechanical properties, low wear resistance, or poor color stability [8][9][10] . Therefore, it is necessary to compensate for the inhomogeneity in the output of the LCU to overcome the problems caused by the inhomogeneous radiation light.…”

Section: Introductionmentioning

confidence: 99%

“…We have previously reported that commercial dental LCUs with different light sources, i.e., quartz-tungsten halogen, plasma-arc light bulbs, and light-emitting diode (LED), provided significantly uneven and inhomogeneous light intensity from the light guide tip to the resin material 6) . Recently, other study also showed 3D views of light beam profile from dental LCUs, and concluded that the irradiance at the light guide tip end of a wide variety of LCUs was not radically symmetrical and could be quiet inhomogeneous 7) .…”

Section: Introductionmentioning

confidence: 99%

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A method for improving the light intensity distribution in dental light-curing units

et al. 2011

Self Cite

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A method for improving the uniformity of the radiation light from dental light-curing units (LCUs), and the effect on the polymerization of light-activated composite resin are investigated. Quartz-tungsten halogen, plasma-arc, and light-emitting diode LCUs were used, and additional optical elements such as a mixing tube and diffusing screen were employed to reduce the inhomogeneity of the radiation light. The distribution of the light intensity from the light guide tip was measured across the guide tip, as well as the distribution of the surface hardness of the light-activated resin emitted with the LCUs. Although the additional optical elements caused 13.2-25.9% attenuation of the light intensity, the uniformity of the light intensity of the LCUs was significantly improved in the modified LCUs, and the uniformity of the surface hardness of the resin was also improved. Our results indicate that the addition of optical elements to the LCU may be a simple and effective method for reducing inhomogeneity in radiation light from the LCUs.

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Effect of mold type, diameter, and uncured composite removal method on depth of cure

2015

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Effect of Inhomogeneity of Light from Light Curing Units on the Surface Hardness of Composite Resin

Cited by 48 publications

References 13 publications

Examination of composite resins with electron microscopy, microhardness tester and energy dispersive X-ray microanalyzer

Examination of composite resins with electron microscopy, microhardness tester and energy dispersive X-ray microanalyzer

A method for improving the light intensity distribution in dental light-curing units

Effect of mold type, diameter, and uncured composite removal method on depth of cure

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