EDUARDO KAZUO KOHARA
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Resumo IPEN-doc 11228 Effects of low-intensity laser therapy on the Orthodontic movement velocity of human teeth2004 - KOHARA, E.K.; CRUZ, D.R.; WETTER, N.U.; RIBEIRO, M.S.Low-intensity laser therapy (LILT) has been studied in many fields of Dentistry, but, to our knowledge, it is the first time that its effects on orthodontic movement velocity in humans are investigated. In our study, eleven patients were recruited for a two-month study. One half of the upper arcade was considered control group and received mechanical activation of the canine teeth every thirty days. The opposite half received the same mechanical activation and was also irradiated with a diode laser (?=780nm) on ten points around the root, during 10s with 20 mW, 5 J/cm2, on four days of each month. Data of the biometrical progress of both groups were statistically compared. All patients showed significant higher retraction velocity of the canines on the laser treated side when compared to the control. Conclusion: Our findings suggest that LILT does accelerate human teeth movement and could therefore considerably shorten the whole treatment duration.Artigo IPEN-doc 10883 Effects of low-intensity laser therapy on the orthodontic movement velocity of human teeth: a preliminary study2004 - CRUZ, D.R.; KOHARA, E.K.; RIBEIRO, M.S.; WETTER, N.U.Artigo IPEN-doc 11846 Effects of 960-nm diode laser irradiation on calcium solubility of dental enamel2006 - KATO, ILKA T.; KOHARA, EDUARDO K.; SARKIS, JORGE E.S.; WETTER, NIKLAUS U.Objective: The aim of this study was to investigate the effects of 960 nm diode laser and acidulated phosphate fluoride on calcium solubility of human dental enamel. Background Data: Interest in diode lasers has grown steadily since its invention due to its inherent advantages and its range of applications. Several other laser types have shown good results in caries prevention; however, there are few studies on dental tissue interactions using diode lasers. Methods: Acid resistance was evaluated using 65 enamel specimens, divided into five groups: control (C), fluoride (F), laser (L), laser + fluoride (LF), and fluoride + laser (FL). The laser was operated using the parameters of 6.5-W peak power, 5-msec pulse duration, 10-Hz repetition rate, and 33-mJ pulse energy. These parameters were previously tested regarding pulpal temperature rise and enamel morphology, and were determined to be safe. The amount of calcium lost during demineralisation was measured. Results: The calcium solubility of the laser group was 12% higher than of the control group (p > 0.05). Group F showed a 33.6% increase of acid resistance (p < 0.05). When laser was associated with fluoride, the calcium solubility increased significantly (p < 0.05) compared to both the control group and the laser group. Groups treated with fluoride showed the same results (p > 0.05). Conclusion: The 960-nm diode laser promoted a slight increase in calcium solubility. A statistically significant reduction on calcium solubility was achieved with the three treatments that involve fluoride (F, FL, and LF). The additional application of laser irradiation did not cause any significant increase or decrease in calcium solubility.