13 Spectrometer Helps Dentists Use Curing Lights More Effectively
A spectroradiometrically calibrated USB4000 Spectrometer from Ocean Optics is helping dentists to use curing lights more effectively to harden the white resin composites used to fill cavities. The spectrometer is a key component of the Managing Accurate Resin Curing (MARC) system developed by Dr Richard Price and researchers at Dalhousie University and commercialised through BlueLight analytics inc. Dr Price has used Ocean Optics equipment in his laboratory since 2002 to measure the output from dental curing lights. The results of his research have been published in 15 papers internationally.
MARC measures the useful energy a simulated resin restoration receives from a dental curing light, a procedure that is affected by the location of the tooth, the type of resin used, the output of the curing light and the accuracy of the practitioner. Too much or too little exposure of the curing light to the restoration can lessen the lifetime of the filling and potentially damage the tooth. With the MARC system, which includes a laboratory-grade NIST-referenced USB4000 Spectrometer, dental researchers, educators, manufacturers and clinicians can more accurately measure the irradiance (in mW/cm2 different dental professionals.
) and energy per unit area (in J/cm2) delivered by various curing lights in the hands of
Slightly larger than a mobile phone, the miniature fibre optic USB4000 Spectrometer uses a 3648-element Toshiba linear CCD array detector and high speed electronics. For the MARC system, the spectrometer has been spectroradiometrically calibrated using Ocean Optics’ NIST-traceable light source (300-1050nm). MARC also uses the CC3-UV Cosine Corrector to collect radiation over 180º field of view. This collection device helps mitigate the effects of optical interference associated with light collection sampling geometry – for example, the distance of the light to the restoration.
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New Line of Single Fibre Assemblies
Allowing the use of fibre optics in potentially damaging environments, Fiberguide Industries introduces its new standard line of single fibre assemblies. Fiberguide’s assemblies have proven effective in a number of scientific and industrial applications ranging from light measurement, process monitoring and control, to UV-VIS spectroscopy, chromatography and fluorescence.
Single fibre assemblies are available with two choices of chemical resistant, non-magnetic sheathing to fit customers’ needs. For general purpose use, Fiberguide’s furcation tubing is comprised of a Kevlar reinforced PVC sleeve over a polypropylene tube. Furcation tubing is non-conductive and protects fibres with a liquid- tight seal.
For more specialised applications, Fiberguide offers stainless steel monocoil sheathing. The monocoil is vacuum compatible and resistant to tight bending, crushing, cutting, kinking and high temperatures.
Both standard cable designs are rated for use at ambient temperatures. Single fibre assemblies are available with core sizes ranging from 50µ to 1000µ and wavelengths from deep UV (DUV) to UV-VIS and VIS-IR. Assemblies are also available upon request with ST and FC connectors, numerical apertures of 0.12 and continuous lengths up to 50 meters.
Circle no. 38 ADVERTORIAL
Fluorescence Lifetime Spectrofluorometer for Every Laboratory!
HORIBA Scientific presents the TemPro which brings the power of lifetime spectrofluorometry to researchers who previously found it unaffordable.
TemPro uses the Time-Correlated Single-Photon Counting (TCSPC) method - the reliable, intuitive, and most sensititive lifetime-measurement technique. The filter-based TemPro can measure the complete range of lifetimes from only 100 picoseconds to 1
second and beyond, with our NanoLED and SpectraLED solid-state pulsed excitation sources spanning wavelengths from the UV to NIR.
The TemPro lifetime spectrofluoremeter is so affordable that any laboratory can now exploit the power of fluorescence dynamics.
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Capture Complete Fluorescence Lifetime Images in Minutes! Horiba Scientific Introduces DynaMyc: Our Fastest Microfluorescence Dynamics Imaging System Ever
Mapping fluorescence dynamics yields much information about molecular motion, sizes, local environment, interaction, and binding, with discrimination to microscopic locations in the sample. Lifetime measurements also eliminate fluorescence artifacts such as non-uniform label loading.
DynaMyc, the latest confocal mapping FLIM system from HORIBA Scientific, now generates lifetime images more than 20 times faster. Based on our long history of leadership in Time Correlated Single Photon Counting (TCSPC) technology and featuring our new range of PicoBrite™ high repetition rate laser diodes, DynaMyc offers a large range of easily interchangeable excitation wavelengths to best match your labels. With the new DynaMyc, Fluorescence dynamics on the picoseconds to microsecond range are now easily accessible to novices and advanced users alike.
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INTERNATIONAL LABMATE - OCTOBER/NOVEMBER 2010 - CHROMATOGRAPHY & SPECTROSCOPY
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