G 171 Otoflash: Flash-curing Unit
BRACON Digital Dental Products
Flash-curing device for rapid and reliable curing of light curable materials/resins The Otoflash G171 has two flashbulbs that emit light into the polymerisation chamber from below. The device can be used for the photopolymerisation of all lightcurable materials where the curing takes place at a wavelength of 280-580 nm.
Spectral range G 171
With its technical configuration, the G 171 Otoflash enables short curing times: In the operating mode, two flash bulbs fitted at the bottom produce ten flashes per second. The respective light radiation at a wavelength of 280-580 nm is very intense. Compared to other methods this achieves a substantially better curing of the materials, resulting in very good physical characteristics and reduced residual monomer content (inhibition layer). The G 171 Otoflash is also deliverable with a protective gas appliance (CO2 or N2). This prevents any oxygen inhibition, surfaces are cured completely non-stick and there is no need to remove or wipe away the inhibition layer.
The G 171 Otoflash has an integrated elapsed time meter, is simple to use and is extremely easy to maintain. Technical data:
Dimensions of polymerisation chamber: 120 x 120 x 50 mm Number of light sources: 2 flashbulbs à 100 w Capacity: 4 BTE-aids or 6 ITE-aids Rated voltage: 100, 117, 230 volt AC, adjustable by switch Rated frequency: 50/60 Hz Power input: 250 watt Spectral distribution: 280-700 nm, maximum between 400 and 500 nm Average flash power: 200 watt Flash frequency: 10 flashes per second Digital timer: adjustable from 1 to 9.999 flashes Dimensions: 310 x 310 x 140 mm Weight: 6 kg
Ga
Frequently asked questions
What grade Purity Nitrogen? Minimum 2.6, which means 99,6% N2 respective 0,4% = 4 ppm O2 Is there a minimum PPM Moisture / Oxygen content? 0,4% = 4 ppm O2 What inlet pressure does the device require ? We recommend adjusting 1-1,5 bar (maximum is possible up to 8 bar but that would be a waste of N2) What flow rate is required? It’s 10-11 litres per minute, however, this is done by the device itself. What is the inlet connect for the device? It’s a quick coupling nozzle. NW 7,2 (you will receive the fitting quick coupling with your unit.)
The Otoflash G-171 is not only good for post-curing printer resins but is suitable for curing all light-cure resins including dental composites. Please find some useful information about the flash-technique below:
Compared to polymerisation through continuous exposure, this device cures with flashes of light and has the following main advantages: 1. At the same radiation dosage, the light intensity is between 1,000 to 10,000 times higher (for the duration of the flash period of approximately 200 µs). Due to the higher intensity, a correspondingly greater amount of free radicals are formed such that, subsequently, there are more opportunities for recombination of the excited molecules. As a result, longer polymer chains are formed and fewer residual monomers remain as compared to other sources of light, this in turn, leads to better biocompatibility. Furthermore, the process leads to improved physical characteristics such as a higher Young’s modulus and a higher Vickers hardness. The high intensity of the flashes also allows deeper penetration into the polymerization material as a sufficiently large number of excited light quanta reach deeper layers. This is particularly important for opaque materials. 2. The light generated in the flashes spans across 280-700 nm in wavelength, by covering such a large part of the light spectrum the excitation of all common photo-initiators is ensured, regardless of material manufacturer, thereby avoiding that the photo-initiator and the light curing device are not matched to each other. 3. Moreover, flash curing devices perform the curing process more quickly compared to other devices. For example, compared to fluorescent tube devices, the curing may be up to 10 times faster. 4. The use of protective gas during the curing process (principally nitrogen gas to displace the oxygen in the polymerization chamber) ensures the curing of the material without development of an inhibition layer (or grease layer) at the surface. This not only eliminates the need for further steps to later remove this layer, but also improves the surface quality and reduces the amount of residual monomers at the surface, thereby improving, or rather ensuring biocompatibility (this device can be also used without N2 gas or can be produced in a version without N2-gas port).
BRACON Digital Dental Products
Bracon Limited • Unit C • Swife Business Park • Burwash Road • Broad Oak • Heathfield • East Sussex TN21 8UP t: +44 (0)1580 817000 f: +44 (0)1580 819455 e: sales@bracon.co.uk
www.bracon.co.uk