Introduction: One of the major concerns in laryngeal laser surgery is the risk of airway fire. The introduction ofwrapped tubes and metal tubes has reduced the fire hazards. However, these tubes are expensive and do not provide convenient access to the surgical field. There are few laboratory studies addressing the resistance of polyvinylchloride tubes against ignition in the given circum...

introduction: the purpose of this study is to evaluated the effect of low power laser on the survival of a skin flap on the dorsum of the rats. materials and methods: fifty male rats were divided into five groups. the surgery was done under general anesthesia where a full thickness skin flap (including panniculus carnosus) from the dorsum of the rats were randomly dissected. the flap size was 2...

purpose : to investigate the sensations experienced by chinese patients during refractive surgery including the laser in situ keratomileusis (lasik), epi-lasik, and sub-bowman keratomileusis (sbk) techniques. a prospective, randomized, and self-matched clinical study was conducted. methods : the participants included 44 men and 58 women aged 16 to 47 years old (mean 24.3±0.6 years) who underwen...

this study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy inconel 718 with thickness of 1 mm. fiber laser with the power of 500 watts was used as the laser source. laser pulse frequency, duty cycle, laser power, focal point position, were assumed as the laser drilling process variables. the hole geometry features, i.e. entrance hole di...

In this paper, we have simulated the excitation of wake fields in the interaction of an intensive laser pulses having Half-Sine and Gaussian time envelopes with a fully ionized cold plasma using particle in cell (PIC) method. We investigated the dependency of wake filed amplitude to different laser and plasma parameters such as laser wavelength, pulse duration and electron number density. In ad...

introduction: providing desirable smile is one of the main concerns in cosmetic dentistry. hyperpigmentation is one of the esthetic concerns especially in gummy smile patients. lasers with different wavelength are used for oral surgery including carbon dioxide laser (co2), neodymium-doped yttrium aluminium garnet (nd:yag), erbium family and diode laser. in this case, all esthetic procedures inc...

SUMMARY 13 Consecutive patients who underwent endoscopic Nd - Y AG laser therapy for palliation of advanced esophageal cardnoma were treated between Oct 1989, and July 1991 , in Khatam - al -Anbia Hospital. All patients had severe dysphagia and conventional methods such as surgery , Radiotherapy and chemotherapy failed to treat them. Undoubtedly without laser therapy these patients did not see...

ptk (phototherapeutic keratectomy) is the use of laser in corneal diseases. we can replace ptk for many other invasive procedures. the objective of this study is the assessment of this procedure in several cases in our practice. this investigation was a retrospective study, which was conducted based on comparison of 11 eyes with corneal eschars, induced by recurrent corneal erosions, pterygium ...