Light Curing Units: Tips For Orthodontists

Radzi, Zamri; Yahya, Noor Azlin; Zamzam, N.; Wood, David

doi:10.22452/adum.vol11no1.3

Cited by 3 publications

(1 citation statement)

References 60 publications

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“…Usually, the light output required for polymerization varies between 360 to 500 nm and more specifically for camphorquinone, which is the most often used photo-initiator in resin composites, the optimum absorption occurs near the wavelength of 470 nm. 19 Therefore, in the present study we preferred three different light units having wavelength range covering the absorbance wavelength of camphorquinone.…”

Section: Discussionmentioning

confidence: 99%

Structural and mechanical analysis of three orthodontic adhesive composites cured with different light units

Yılmaz

Bakkal

Kurt

2020

Journal of Applied Biomaterials & Functional Materials

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Objective: To evaluate the effects of three different curing units on the physical and mechanical features of three different orthodontic adhesive resin materials. Material and Methods: 45 specimens (5 mm in diameter, and 2 mm in thickness) of each of the three different adhesive composite resin materials (Transbond XT, Grēngloo™ Adhesive and Light Bond Paste) were cured with three different light units (a polywave third generation (Valo), a monowave (DemiUltra), and a second-generation LED (Optima 10)). To quantify degree of conversion (DC), the Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy was used in transmission mode (ALPHA FT-IR Spectrometer, Bruker Optics, Germany). Vickers hardness value was recorded under constant load 100 g for 10 s with a microhardness tester (HMV M-1, Shimadzu Corp., Kyoto, Japan). The data were statistically analyzed using Kruskal-Wallis and chi-square tests. The level of significance was considered p < 0.05. Results: The highest DC values were obtained as a result of curing with Optima 10. This rate was followed by Demi Ultra and Valo, respectively. Transbond XT samples showed a lower level of conversion than the samples of Light Bond Paste and Grēngloo™ Adhesive. The top surfaces of each material showed higher hardness values than the bottom surfaces ( p < 0.05). The Light Bond Paste showed the highest hardness values both on the top and bottom surfaces among the three materials, followed by Grēngloo™ Adhesive. While the hardness values of the top surfaces of the samples cured with Demi Ultra and Valo light units were similar, higher hardness values are recorded with Valo on the bottom surfaces (Valo; 85.200/75.200 (top/bottom) versus Demi Ultra; 86.100/66.000 (top/bottom)). Conclusions: The different DC and the surface hardness properties were recorded for the resin as orthodontic adhesives depending on different light units. Shorter radiation time caused lower DC and surface hardness values.

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Section: Discussionmentioning

confidence: 99%

Structural and mechanical analysis of three orthodontic adhesive composites cured with different light units

Yılmaz

Bakkal

Kurt

2020

Journal of Applied Biomaterials & Functional Materials

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Standardization of Distance and Angulation of Light Curing Unit Tip Using Distometer

Radzi

Kasim

Yahya

et al. 2007

3rd Kuala Lumpur International Conference on Biomedical Engineering 2006

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The purpose of this study was to investigate the light intensity of selected light curing unit with varying distance and angulation of the light curing tip and lightmeter. Four types of light units; Spectrum 800 (Dentsply), Coltulux 3 (Coltene), Elipar FreeLight 2 (3M Espe) and Starlight Pro (Mectron) were evaluated for light intensity at various distance between the light curing tip and the lightometer Cure Rite Denstply (0, 1, 3, 5, 10 and 15 mm). The light curing units were angulated at 45 degrees, 60 degrees and 90 degrees at a standardized 5 mm distance. The intensity of light curing is affected by the distance between the light curing tip and the lightmeter. However, the decrease in light intensity of the light curing unit was found not to obey the inverse square law for the distances 0 to 15 Mm. The study found that there was no significant difference between 45 degrees and 600 angulation between the light curing tip and the lightmeter. However, the decrease in light intensity is significant when compared to the light tip is placed perpendicular (90 degrees) to the aperture of the light meter.

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The Effect of Light Curing Tip Angulations on the Shear Bond Strength of an Orthodontic Adhesive

Yusoff

Radzi

Kasim³

et al.

IFMBE Proceedings

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The purpose of this study was to investigate the effect of light curing tip angulations on the shear bond strength of an orthodontic adhesive. Three groups of thirty premolar teeth had brackets attached in a standardized manner using Transbond XT. The orthodontic adhesive were cured with a Blue LED light curing unit for 40 seconds using three different angulations 0 degrees, 45 degrees and 9 degrees at a standardized 3 mm distance. The debonding force was measured using an Instron Universal Testing Machine. Data were computed and analysed using SPSS version 12.0. Kruskal-Wallis test was employed to compare the shear bond strength of all groups. The study found that there was no significant difference on the shear bond strengths of orthodontic adhesive when cured at the angulations of light curing tip of 0 degrees, 45 degrees and 90 degrees.

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Light Curing Units: Tips For Orthodontists

Cited by 3 publications

References 60 publications

Structural and mechanical analysis of three orthodontic adhesive composites cured with different light units

Structural and mechanical analysis of three orthodontic adhesive composites cured with different light units

Standardization of Distance and Angulation of Light Curing Unit Tip Using Distometer

The Effect of Light Curing Tip Angulations on the Shear Bond Strength of an Orthodontic Adhesive

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