Iraqi Journal of Laser

Pyogenic granuloma is one of the inflammatory hyperplasia seen in the oral cavity. The present study included 10 patients with pyogenic granuloma, involving 4 males and 6 females with 1:1.5 male to female ratio. Patient ages ranged from 5 to 85 years (mean, 30 years) and half of the lesions had pedunculated base, with surface ulceration in 10% of cases. Treatment consisted of resection, using 810 nm diode lasers. Eight patients were anesthetized during the surgical operation by local infiltration of anesthesia. Only three patients reported mild post-operative pain within the first 24 hours of the healing period.During the surgical operation there was no significant bleeding so clear surgical field. There was no bleeding postoperatively. There was mild edema appear in first 2 days after the surgery, and then it subsided gradually. There was no infection in all the patients treated. One day following the operation the intra oral examination showed dark-brown necrotic tissue, friable with red inflamed line around the edges. After five days, the observation revealed that the sloughs tissue was completely changed to white color and was easily removed by gauze. Wound healing was excellent after only one week. All the samples were diagnosed histopathologically as pyogenic granuloma.

The main objective of this study is to determine the suitable excitation wavelengths for urine components reaching to select the suitable lasers to execute the auto fluorescence due to their high intensities. The auto fluorescence was measured at 305, 325 and 350 nm excitation wavelengths for eleven urine samples which were also analyzed by conventional methods (chemical and microscopic examination). Data manipulation using Matlab package programming language showed that urine sample with normal chemical and biological components have emission peaks which are different from the infected urine samples. Despite the complexity of the composition of urine, fluorescence maxima can be observed. Most likely, the peaks observed do not result from a single fluorescent urinary metabolite, but depend on differences in urine component that is changed according the clinical situation of person.

This paper presents a method of designing and constructing a system capable of acquiring the third dimension and reconstructs a 3D shape for an object from multi images of that object using the principle of active optical triangulation. The system consists of an illumination source, a photo detector, a movement mechanism and a PC, which is working as a controlling unit for the hard ware components and as an image processing unit for the object multi view raw images which must be processed to extract the third dimension. The result showed that the optical triangulation method provides a rapid mean for obtaining accurate and quantitative distance measurements. The final result's analysis refers to the necessity of using laser light in the active optical sensing technique for its unique chara