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46 OPTOINFORMATICS’05 DENTAL RESIN HOLOGRAMS S. Toxqui-López, A. Olivares-Pérez, N. Grijalva y Ortiz, M. P. Hernández-Garay, B. Ruiz -Limón, I. Fuentes-Tapia Instituto Nacional de Astr<strong>of</strong>ísica Óptica y Electrónica (INAOE), Calle Luis Enrique Erro No. 1 Tonantzintla, Puebla, México E-mail: stoxqui@inaoep.mx, olivares @inaoep.mx The “Point 4 KERR ® ” is a light cured resin based on composite dental restorative can be used as replayed recording holographic medium applied conventional microlithography techniques with ultraviolet light, his material provides advantages in production time and unit cost to replica with high diffraction efficiency Hologram. There are different kinds <strong>of</strong> photopolymer resin to be found in the market. One <strong>of</strong> them is “Point 4 KERR ® ” has a specify application in the odontology area, however it has other application as such as holography, it is a composite resin that contains approximately 77% by weight (59% by volume) inorganic filler with an average particle size <strong>of</strong> 0.4 microns, their main components are bishhenol A- glycidyl methacrylate (Bis-GMA) resin matrix, urethane dimethacrylate (UEDMA) and (TGDMA) [1,2,3] . We doped the resin with solvent given result a liquid solution, this solution is analyzed by IR spectroscopy (figure 1). 100.6 95 90 85 80 75 70 65 3413.84 3413.15 2964.01 2962.62 2177.28 2173.38 3020.81 2019.14 1996.17 1636.77 1637.23 1509.52 1509.57 1415.79 1453.70 1319.57 1320.63 1362.46 1297.39 1249.69 1296.61 830.87 814.24 829.60 812.46 666.82 60 55 %T 50 2 1718.07 1217.54 1161.22 45 40 35 1713.24 1 1163.77 30 25 20 p prueba2 1 IR spectrum from “Point 4 KERR ® ”. 2 IR spectrum from “Point 4 KERR ® ” doped. 15 749.24 10 6.3 4000.0 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 650.0 cm-1 Figure 1. Infrared spectrums from the resin In 3413.15 appear vibration from de bond CH that correspond a dimmer polymer, the region 3020.81-2962.62 is due to asymmetry vibration from bond CH 3 -, the strong absorption at 1713.24 which correspond to the carbonyl group C=O <strong>of</strong> group ester, - C=Cis a medium in 1636.77, 1637.23 that imply an aromatic rings, the presence <strong>of</strong> –C-O-C from ester group occur in 1040.44-999.55, also an absorption band with a high intensity in 749.24.UV spectrum is obtained (figure 2) we can observed important differences after UV radiation the solution presents a change <strong>of</strong> density in the region 190-250 nm, therefore this show that it is a photosensitive material. 1040.44 999.55 Coating film without UV exposition. 1.2 -------Coating film after exposition. 1.0 Absorbance(a.u) 0.8 0.6 0.4 Figure 2. UV spectrum <strong>of</strong> the resin. 0.2 0.0 100 200 300 400 500 600 700 800 900 1000 wavelength (nm)
SAINT-PETERSBURG, October 17 – 20, 2005 47 The replicated hologram is obtained by the next technique, first a digital patter by computer simulation <strong>of</strong> a Fourier hologram (figure 3) generated later with lithographic tools this is photoreduced to obtaining gray-scale transmission masks. The solution (Point 4 KERR ®¨ modifiable resin) is poured by Spin coater on commune substrate then the mask is aligner with the layer resin that is cured by exposure to UV light, finally the mass takes <strong>of</strong>f and the hologram pattern is transferred onto layer substrate without some develop process after that the hologram is reconstructed (figure 5). Figure 3. Microstructure Fourier Hologram Figure 4. Object used to obtain digital hologram Figure 5. Diffraction pattern optical reconstruction Figure 7 shows the diffraction efficiency <strong>of</strong> an absorption hologram as a function <strong>of</strong> the energy. The diffraction efficiency increased in function <strong>of</strong> the UV irradiance exposition, the maximum efficiency is obtained at 40 seconds exposure time that correspond a 0.29 joules/cm 2 <strong>of</strong> energy this is 82.7%, after that decrease. 80 Diffraction efficiency(%) 60 40 20 0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 Energy (Joules/cm 2 ) Figure 6. Diffraction pattern <strong>of</strong> a single grating Figure 7. Diffraction efficiency <strong>of</strong> the grating array “The Point 4 KERR ® ” is a composite resin, this have a organic phase (matrix), the disperse phase (filler), and the interfacial phase coupling agent. This resin can be used as layer film and the method present in this paper is simple and faster for obtaining a replayed hologram. 1. Tani Y, New technology <strong>of</strong> composite resins developed in Japan, Trans. Second Int Cog Dent Mater 1993, 54-61. 2. Ruyter IE, Oysaed H. Composite for use in posterior teeth: Composition and conversion, J Biomed mater Res 1987, 21(1), 11-23. 3. Hosada H. Yamada, Inokoshi S. SEM and elemental analysis <strong>of</strong> composites resins. J Prosthet Dent 1990, 64(6), 669-676. 4. Svetlana S. and Dejan P. Relief hologram replication using a dental composite as an embossing tool, Optics Express 2005, 13(7), 2747-2754. 5. A Guide for using Point 4 Optimized Particle Composite System, Keer Corpotation.
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