the modulation response, relative intensity noise and frequency noise characteristics of qd lasers are investigated theoretically, in presence of an additional optical pumping. it is revealed that the modulation response of qd laser enhances under additional optical beam. by small signal analysis of the carriers' and photons' rates, it is proposed that by injecting excess carriers to ...

o bjectives: one major drawback of orthodontic treatment is its long duration due to slow tooth movement and the pain at the onset of treatment following application of forces. there is controversy regarding the efficacy of laser for decreasing the treatment time and pain of orthodontic treatment. the purpose of this study was to investigate the effect of low level diode laser on the rate of or...

introduction: low level laser therapy (lllt) also known as photobiomodulation, is a treatment that uses low-level lasers or light-emitting diodes (leds) to change cellular function and is a clinically well accepted tool in regenerative medicine and dentistry. considering the variety of laser, exposure, cells and study types, the exact effects of low level laser therapy seems to be unclear. the ...

introduction: tooth pain and sensitization are the two main causes of discomfort after periodontal flap surgery. effects of low level laser therapy for reducing pain have already been established; these kinds of lasers have been used for tooth desensitization as well. this controlled blind study sought to compare tooth pain and sensitization after 660nm laser irradiation in a split mouth and al...

introduction: an attack of acute myocardial infarction (mi) poses the threat of great damage to cardiac tissue. operative therapeutic modalities such as coronary artery bypass grafting (cabg) may enhance myocardial perfusion in high-grade coronary vasculature occlusions. it has been shown previously that low-level laser therapy (lllt) significantly reduces infarct size following induction of my...

low-power lasers are a group of lasers with a power less than 500 mw and unlike high-power lasers they have no effect on tissue temperature; they produce light-dependent chemical reactions in tissues. the purpose of this study was to review the clinical applications of these lasers and their success rate in different studies in orofacial pains. the articles with the key word “low level laser th...

objective: low-level laser therapy (lllt) has been increasingly in use over the last few decades in both medicine and dentistry. it has been suggested that lllt may be helpful in pulpal wound healing following pulp exposure. the purpose of this study was to compare the effectiveness of lllt and formocresol (fc) application in healing of remaining pulp following pulp amputation in primary molars...

introduction: the american academy of orofacial pain defined temporomandibular disorders (tmds) as”a collective term that embraces a number of clinical problems that involve the masticatory muscles, the tmj (temporomandibular joint), and the associated structures”. pain and dysfunctional symptoms or signs such as limitations in opening, asymmetric jaw movements and tmj sounds are the most commo...

background postoperative pain is a common complication that can lead to serious morbidities and delayed recovery. objectives the aim of this study was to investigate the effect of low-level laser therapy on acute pain after tibial fracture surgery. patients and methods in this randomized clinical trial, 54 patients who were candidate for tibial fracture surgery were allocated randomly to two gr...

the key role of chemokine receptor cxcr4 in the maintenance of stemness property of stem cells has been shown recently. the low level laser irradiation (llli) is being used currently in a wide variety of clinical cases as a therapeutic tool for wound healing, relieving pain and destroying tumor cells. the aim of this study was to evaluate the effect of llli mimicking low level laser therapy (ll...