Journal of Lasers, Optics & Photonics

Objective: To evaluate the effect of low level laser and Fitostimuline gel® application on pain and healing of orthodontic related traumatic aphthous. Materials and methods: In this double blind and randomized clinical trial, 60 subjects reported traumatic aphthous lesions and the same day they appear immediately they were placed in :G1: (control group) at 13 patients in which only the traumatic factor of the lesion was removed.G2: (Fitostimuline®) 14 patients treated with Fitostimuline® 3 times a day, until the lesion disappeared.G3: (Laser) 14 patients treated with LLLT (Low Level Laser Therapy). G4: (Laser + Fitostimuline®) 15 patients treated with LLLT application and Fitostimuline® 3 times per day, until the lesion healed completely. ANOVA was applied for parametric data, and non-parametric ANOVA (Kruskal-Wallis test - Friedman) and Mann-Whitney U test were made. Past statistical software version 2010 for Excel was used. Results: Higher diameter aphthous ulcer measures and pain significantly reduced for the Fitostimuline Gel®and Laser treated groups or both combined if compared with the control group. The medicament effect its slow if compared to laser therapy, nonetheless when used simultaneously the effect does not differ from the one obtained by laser only application. Fitostimuline Gel® application does not increase laser effect on healing. Conclusions: Topical Fitostimuline Gel® and LLLT therapy are highly efficient treatment options for aphthous ulcer and pain generated by orthodontic treatment, when compared to a control group. LLLT therapy, it’s more effective than Fitostimuline Gel® for orthodontic related aphthous ulcer treatment. Combining therapies do not improve nor enhance treatment results.

Yellow ochre mineral obtained from Vempalli mandal, Cuddapah district, Andhra Pradesh of India is investigated in the present work. Its chemical analysis indicate that Fe2O3=4.22 wt% and TiO2=0.64 wt%. Structural characterization is performed using X-ray diffraction (XRD). XRD results suggest that goethite (Fe2O3) and quartz are present. Among them goethite is the major constituent. Its unit cell is orthorhombic with a=4.14, b=10.0, c=3.03Å. The ligands around the metal ion present in the structure are investigated using FTIR spectroscopy. Internal structure studied using TEM suggests that the mineral consists of needle shaped iron oxide nano particles and quartz formed as tetrahedral and octahedral layers. EPR results indicate that the unit cell of the crystal contains Fe(III), and its g values are found to be 4.19 and 2.13. FTIR properties are due to the presence of silicate and hydroxyl anions as ligands. Nonlinear optical measurements carried out using Z-scan reveal the presence of strong nonlinear optical limiting in the material, indicating potential applications in laser safety devices.

Problem statement: The third order nonlinear optical properties of organic Polymers are used in high speed telecommunications, optical limiters and optical; computes. The purpose of study was to determine the spectral and third order nonlinear characteristics of the organic dye, Victoria blue in liquid and in solid medium.

Approach: The samples were prepared by dissolving the dye in n-butyl acetate (liquid medium) and a thin film of thickness 1mm was prepared by bulk polymerization method. The spectral characteristics of victoria blue dye doped poly (methyl methacrylate) modified with additive n-butyl acetate (nBA) are studied by recording its absorption and fluorescence spectra and the results are compared with the corresponding liquid mixture. The nonlinear refractive index of the dye in nBA and dye doped polymer film were measured using z-scan technique [1], by exciting with He- Ne laser. The results obtained are intercompared.

Results: Both the samples of dye Victoria blue in liquid and solid medium show a negative nonlinear refractive index. A negative nonlinear dye doped films can be used as optical limiters. The origin of optical nonlinearity in the dye may be attributed due to laser-heating induced nonlinear effect.

PACS Code: 42.55.Mv, 42.65.-k, 82.35.Ej, 42.70.Jk

Barium oxide (BaO) and zinc sulfide (ZnS) are well known for their applications in electrical, optical and chemical industries. The present study was aimed to evaluate the impact of biofield treatment on the structural and physical properties of BaO and ZnS powder. The study was carried out in two groups, one was set to control, and another group was subjected to Mr. Trivedi’s biofield treatment. Control and treated samples of BaO and ZnS were analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and surface area analyzer. XRD data showed that lattice parameter and unit cell volume of BaO powder were reduced upto 0.42% and 1.26%, respectively as compared to control. Whereas, density of treated BaO was increased upto 1.27% as compared to control. Besides, the unit cell volume was changed in treated ZnS from -0.55 to 0.24% as compared to control that led to change in density from -0.24 to 0.55% after biofield treatment. However, the crystallite size was substantially increased upto 40.5% and 71.4% in treated BaO and ZnS, respectively as compared to control. FT-IR data exhibited that absorption peaks at wavenumber 862/cm (control) was shifted to 858/cm in treated BaO. Upward shifting of absorption peaks corresponding to Zn-S stretching bond was observed in treated (617/cm) as compared to control (592/cm). Furthermore, surface area result showed that it was reduced by 4.32% and 2.1% in treated BaO and ZnS powder, respectively as compared to control. Hence, these, findings suggest that biofield treatment has altered the structural and physical properties of BaO and ZnS powders.