Combining linear polarization spectroscopy and the Representative Layer Theory to measure the Beer–Lambert law absorbance of highly scattering materials

Gobrecht, Alexia; Bendoula, Ryad; Roger, Jean‐Michel; Maurel, Véronique Bellon

doi:10.1016/j.aca.2014.10.014

Cited by 74 publications

(34 citation statements)

References 30 publications

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“…It can be assumed, that the degree of cure and debonding force would have been lower with optical contact during curing. However, scattering cannot be considered as an independent phenomenon since light propagation is composed of absorbed, transmitted and reflected light [14]. Our results are thus in line with the earlier conclusions that transillumination seems to be clinically viable curing method for bonding brackets to incisors but not to premolars [9,10].…”

Section: Discussionsupporting

confidence: 89%

Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Mäkinen

Lassila

Varrela

et al. 2019

Biomaterial Investigations in Dentistry

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Bonding properties of light-curing adhesive cured by transillumination through the tooth were compared to those achieved by the conventional technique. The study analyzed the degree of cure (DC%), debonding force (DF) and adhesive remnant index (ARI) when light was transmitted through dental hard tissues. Slices of dentin and enamel of 1 mm in thickness were combined with total thicknesses of 3 or 4 mm to simulate tooth structure without the pulp tissue. DC% with curing time of 20 s, 40 s and 60 s and irradiance power was measured for each group (n ¼ 5). Brackets were bonded using transillumination on extracted incisors (n ¼ 6) and premolars (n ¼ 10), and DF was measured and ARI was scored. No statistical difference was found in light transmission between the simulated samples and incisors (p > .05). Increasing the curing time from 40 s to 60 s enhanced the DC% only in premolars (p < .05). An adequate DF was achieved through transillumination both in incisors and premolars, but in premolars, the DC% remained low compared to conventionally cured brackets. Most of the bracket failures resulted from weak bracket-adhesive bond. ARTICLE HISTORY

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Section: Discussionsupporting

confidence: 89%

Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Mäkinen

Lassila

Varrela

et al. 2019

Biomaterial Investigations in Dentistry

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“…When light propagates through turbid media (scattering media), the light is composed of absorbed, transmitted, and reflected light [ 20 ]. However, the absorbance values are hard to approximate from the Beer-Lambert law, because scattering cannot be separated and considered as an independent phenomenon [ 21 ].…”

Section: Discussionmentioning

confidence: 99%

Transmission of Curing Light through Moist, Air-Dried, and EDTA Treated Dentine and Enamel

Uusitalo

Varrela

Lassila³

et al. 2016

BioMed Research International

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Objective. This study measured light transmission through enamel and dentin and the effect of exposed dentinal tubules to light propagation. Methods. Light attenuation through enamel and dentin layers of various thicknesses (1 mm, 2 mm, 3 mm, and 4 mm) was measured using specimens that were (1) moist and (2) air-dried (n = 5). Measurements were repeated after the specimens were treated with EDTA. Specimens were transilluminated with a light curing unit (maximum power output 1869 mW/cm2), and the mean irradiance power of transmitting light was measured. The transmission of light through teeth was studied using 10 extracted intact human incisors and premolars. Results. Transmitted light irradiance through 1 mm thick moist discs was 500 mW/cm2 for enamel and 398 mW/cm2 for dentin (p < 0.05). The increase of the specimen thickness decreased light transmission in all groups (p < 0.005), and moist specimens attenuated light less than air-dried specimens in all thicknesses (p < 0.05). EDTA treatment increased light transmission from 398 mW/cm2 to 439 mW/cm2 (1 mm dentin specimen thickness) (p < 0.05). Light transmission through intact premolar was 6.2 mW/cm2 (average thickness 8.2 mm) and through incisor was 37.6 mW/cm2 (average thickness 5.6 mm). Conclusion. Light transmission through enamel is greater than that through dentin, probably reflecting differences in refractive indices and extinction coefficients. Light transmission through enamel, dentin, and extracted teeth seemed to follow Beer-Lambert's law.

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“…A sample appears to be transparent when it allows light, at specific wavelengths, to pass through it without being scattered. 20 The amount of light transmitted would represent the optical clarity of the sample measured. 5,19 Thus, the degree of transparency is dependent on the particle size, particle size distribution and the nature of the particles and surfactants used.…”

Section: Transmittance Measurementmentioning

confidence: 99%

Physicochemical, morphological and cellular uptake properties of lutein nanodispersions prepared by using surfactants with different stabilizing mechanisms

et al. 2016

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In this study, we prepared a series of lutein nanodispersions via the solvent displacement method, by using surfactants with different stabilizing mechanisms. The surfactants used include Tween 80 (steric stabilization), sodium dodecyl sulfate (SDS; electrostatic stabilization), sodium caseinate (electrosteric stabilization) and SDS-Tween 80 (electrostatic-steric stabilization). We then characterized the resulting lutein nanodispersions in terms of their particle size, particle size distribution, zeta potential, lutein content, flow behavior, apparent viscosity, transmittance, color, morphological properties and their effects on cell viability and cellular uptake. The type of surfactant used significantly (p < 0.05) affected the physical properties of the nanodispersions, but the chemical properties (lutein content) remained unaffected. Transmission electron microscopy (TEM) images obtained from this study demonstrated that the solvent displacement method was capable of producing lutein nanodispersions containing spherical particles with sizes ranging from 66.20-125.25 nm, depending on the type of surfactant used. SDS and SDS-Tween 80 surfactants negatively affected the viability of the HT-29 cells used in this study. Thus, for the cellular uptake determination, only Tween 80 and sodium caseinate surfactants were used. The cellular uptake of the lutein nanodispersion stabilized by sodium caseinate was higher than that which was stabilized by Tween 80. All things considered, the type of surfactant with different stabilizing mechanisms did produce lutein nanodispersions with different characteristics. These findings would aid in future selection of surfactants in order to produce nanodispersions with desirable properties.

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Combining linear polarization spectroscopy and the Representative Layer Theory to measure the Beer–Lambert law absorbance of highly scattering materials

Cited by 74 publications

References 30 publications

Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Transmission of Curing Light through Moist, Air-Dried, and EDTA Treated Dentine and Enamel

Physicochemical, morphological and cellular uptake properties of lutein nanodispersions prepared by using surfactants with different stabilizing mechanisms

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