Experimental study using diode laser in discs: the healing process in discs and adjacent vertebrae after laser irradiation

2004 ◽  
Author(s):  
Kumi Naga ◽  
Sadaaki Nakai ◽  
Kazuyuki Maehara ◽  
Seiji Nishimoto
Keyword(s):  
Experimental Study ◽  
Laser Irradiation ◽  
Diode Laser ◽  
Healing Process

scholarly journals Photobiomodulation by a 635nm Diode Laser on Peri-Implant Bone: Primary and Secondary Stability and Bone Density Analysis—A Randomized Clinical Trial

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Jacek Matys ◽  
Katarzyna Świder ◽  
Kinga Grzech-Leśniak ◽  
Marzena Dominiak ◽  
Umberto Romeo
Keyword(s):  
Bone Density ◽  
Total Energy ◽  
Laser Irradiation ◽  
Diode Laser ◽  
Healing Process ◽  
Average Power ◽  
Titanium Implants ◽  
Implant Stability ◽  
The Impact ◽  
Secondary Stability

Introduction. Various procedures in dental implantology are performed to enhance the bone healing process and implant stability. One of these methods can be a low-level laser therapy (LLLT).Objectives. The aim of our study was to evaluate the stabilization (primary and secondary) and bone density in peri-implant zone after LLLT protocol using a 635 nm diode laser.Material and Methods. The research included 40 implants placed in the posterior region of a mandible in 24 patients (8 women and 16 man; age: 46.7 ± 8.7 years). The patients were randomly divided into 2 groups G1 (n=12, 18 implants) and G2 (n=12, 22 implants) according to the treatment procedure; G1 (test): 635 nm laser, with handpiece diameter: 8mm, output power: 100mW, spot area: 0.5024cm2, average power density: 199.04mW/cm2, continuous mode, dose: 4J per point (8J/cm2), time: 40 sec per point, 2 points (irradiation on a buccal and a lingual side of the alveolus/implant), and total energy per session 8J; G2 (control): no laser irradiation. The G1 (test) group’s implants were irradiated according to the following protocol: 1 day before surgery, immediately after the surgery and 2, 4, 7, and 14 days after. The total energy after all therapeutic sessions was 48J. The implants stability was measured employing a Periotest device (Periotest Test Value: PTV) (measured immediately after the surgery, 7 days, 2 weeks, 4 weeks, and 2 and 3 months after the surgery) and the bone density using cone-beam computed tomography (grayscale value) (measured immediately after the surgery, 4 weeks and 12 weeks after the treatment).Results. The average implant stability at different time points showed lower PTV value (higher stability) at2ndand4thweek after 635 nm laser irradiation (G1) compared with a control (G2) group (p<0.01). The secondary stability of the implants after 12 weeks observation was not significantly higher for the laser group in contrast to none-irradiated implants (p>0.05). The mean grayscale value at the apical, middle, and cervical level of the titanium implants showed the reduction of pixel grayscale value after 2 weeks and was lower for the G1 group in contrast to the G2 group (p<0.01). The value of grayscale after 12 weeks was significantly higher at the middle and apical level of the implants in the G1group in contrast to the G2 group (p<0.01).Conclusion. The application of the 635 nm diode laser enhanced secondary implant stability and bone density. However, to assess the impact of the LLLT on peri-implant bone with different bone densities, further well-controlled long-term trials on larger study groups are needed.

scholarly journals Bactericidal Effects of Diode Laser Irradiation on Enterococcus faecalis Using Periapical Lesion Defect Model

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Masato Nagayoshi ◽  
Tatsuji Nishihara ◽  
Keisuke Nakashima ◽  
Shigetsugu Iwaki ◽  
Ker-Kong Chen ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Diode Laser ◽  
Enterococcus Faecalis ◽  
Periapical Lesion ◽  
Lesion Area ◽  
Defect Model ◽  
Cytotoxic Effects ◽  
Periapical Lesions ◽  
Bactericidal Effects

Objective. Photodynamic therapy has been expanded for use in endodontic treatment. The aim of this study was to investigate the antimicrobial effects of diode laser irradiation on endodontic pathogens in periapical lesions using an in vitro apical lesion model. Study Design. Enterococcus faecalis in 0.5% semisolid agar with a photosensitizer was injected into apical lesion area of in vitro apical lesion model. The direct effects of irradiation with a diode laser as well as heat produced by irradiation on the viability of microorganisms in the lesions were analyzed. Results. The viability of E. faecalis was significantly reduced by the combination of a photosensitizer and laser irradiation. The temperature caused by irradiation rose, however, there were no cytotoxic effects of heat on the viability of E. faecalis. Conclusion. Our results suggest that utilization of a diode laser in combination with a photosensitizer may be useful for clinical treatment of periapical lesions.

scholarly journals Viability of human septal cartilage after 1.45 µm diode laser irradiation

2008 ◽  
Vol 40 (8) ◽  
pp. 562-569 ◽  
Author(s):  
Ick-Soo Choi ◽  
Yong-Seok Chae ◽  
Allison Zemek ◽  
Dmitry E. Protsenko ◽  
Brian Wong
Keyword(s):  
Laser Irradiation ◽  
Diode Laser ◽  
Septal Cartilage

scholarly journals Experimental study of the ICG dye enhanced diode laser therapy for esophageal varices.

1997 ◽  
Vol 18 (Supplement) ◽  
pp. 203-206
Author(s):  
Shoryoku Hino ◽  
Takuya Hayashi ◽  
Tunenori Arai ◽  
Makoto Kikuchi ◽  
Hiroshi Kakutani ◽  
...  
Keyword(s):  
Experimental Study ◽  
Laser Therapy ◽  
Diode Laser ◽  
Esophageal Varices

scholarly journals Effect of submucosal ICG injection to prevent the injury on muscle layer due to diode laser irradiation

1996 ◽  
Vol 17 (Supplement) ◽  
pp. 477-480
Author(s):  
Shoryoku Hino ◽  
Takuya Hayashi ◽  
Tunenori Arai ◽  
Makoto Kikuchi ◽  
Katunori Masuda ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Diode Laser ◽  
Muscle Layer

scholarly journals Experimental Study on the Contact Pressure Laser Irradiation Technique

1991 ◽  
Vol 12 (Supplement) ◽  
pp. 203-206
Author(s):  
Kazuichi Katoh ◽  
Akinori Nagasawa
Keyword(s):  
Experimental Study ◽  
Laser Irradiation ◽  
Contact Pressure

scholarly journals Experimental Study on the Healing Process of Tongue Wounds Created by CO2 Laser

1994 ◽  
Vol 5 (1) ◽  
pp. 1-11
Author(s):  
Takahide KOMORI ◽  
Tsuyoshi TAKATO ◽  
Norikazu OKADA ◽  
Tetsuya AKAGAWA
Keyword(s):  
Experimental Study ◽  
Co2 Laser ◽  
Healing Process

scholarly journals The Efficacy of a Diode Laser on Titanium Implants for the Reduction of Microorganisms That Cause Periimplantitis

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7215
Author(s):  
Anna Wawrzyk ◽  
Michał Łobacz ◽  
Agnieszka Adamczuk ◽  
Weronika Sofińska-Chmiel ◽  
Mansur Rahnama
Keyword(s):  
Laser Irradiation ◽  
Diode Laser ◽  
Fungal Species ◽  
Laser Wavelength ◽  
Titanium Implants ◽  
Isolation And Identification ◽  
Implant Surface ◽  
Streptococcus Constellatus ◽  
Surface Optical ◽  
Irradiation Process

The paper presents the optimisation of a safe diode laser irradiation process applied to the surface of titanium implants in order to reduce microbial numbers in the treatment of inflammation classified as periimplantitis. The study comprised isolation and identification of microorganisms inhabiting surfaces of dental implants, crowns, teeth and saliva from patients with fully symptomatic periimplantitis. Microorganisms were detected by a culture-dependent method and identified with the use of MALDI-TOF mass spectrometry. The isolated microorganisms were inoculated on the surface of a new implant and then irradiated by a diode laser (wavelength of 810 ± 10 nm) in one, two or three repetitions and biocidal efficacy was assessed. To evaluate impact of laser irradiation on roughness, morphology and structure of the implant surface, optical profilometry, scanning electron microscopy and optical microscopy were used. Examination of the tested surfaces and saliva revealed the presence of Gram-positive and Gram-negative bacteria and one fungal species. In all patients, cultures from the endosseous part of the implant revealed the presence of the pathogenic and pyogenic bacterium Streptococcus constellatus. In 13 out of 20 samples laser-irradiated in duplicate and triplicate, all microorganisms were eliminated. The irradiation used did not cause any changes in the properties of the implant surface.

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