Investigation of thermal effects caused by interaction of laser radiation with soft tissues

2012 ◽  
Author(s):  
Mariusz Kastek ◽  
Tadeusz Piatkowski ◽  
Henryk Polakowski ◽  
Andrzej Zajac
Keyword(s):  
Laser Radiation ◽  
Thermal Effects ◽  
Soft Tissues

Influence of the laser radiation with the wavelength 2.7 um onto the hard and soft tissues of the mouth cavity

1994 ◽  
Author(s):  
Victor N. Balin ◽  
Alexey S. Gook ◽  
Vladimir N. Koshelev ◽  
Sergey P. Kropotov ◽  
Tatyana A. Kusovkova ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Soft Tissues ◽  
Mouth Cavity

scholarly journals Theoretical bases of calculation of energy parameters of laser radiation for thermotherapy of Baker's cyst.

2017 ◽  
Vol 10 (4) ◽  
pp. 304-309
Author(s):  
Andrew V Zhilyakov ◽  
S A Chernyadiev ◽  
A V Aretinskiy ◽  
N I Sivkova ◽  
N Yu Korobova ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Laser Radiation ◽  
Thermal Effects ◽  
Negative Impact ◽  
Heat Removal ◽  
Thermal Exposure ◽  
Thermal Imager ◽  
Radiation Emission ◽  
Lidocaine Solution ◽  
Series Of Experiments

Actuality: Interstitial application of light energy to pathological tissues of small volume always raises concerns about the possible negative impact of excessive thermal effects on the surrounding unchanged structures. At the same time, insufficient thermal exposure does not allow achieving the desired result of manipulation. In particular, with a similar problem, there are surgeons performing laser-induced thermotherapy of cysts of different localization. Objective: Determine the time to reach the desired temperature required for the irreversible coagulation of the wall of the Baker cyst, depending on the power of the laser radiation and the volume of the intracystic fluid. Materials and methods: Several series of experiments were carried out in which different volumes of aqueous lidocaine solution were heated in disposable syringes by laser radiation fed along a flexible light-bearing fiber. Registration of infrared radiation from this system was performed by a portable thermal imager CONDTROL IR-CAM (Russia). The time for heating the syringe to 70 ° C was measured at different radiation powers. Results: In all series of experiments, a predetermined temperature of 70 ° C was achieved, providing instantaneous protein coagulation. Attention is drawn to the fact that the calculated time by the formula (ideal) in all cases is less, which can be explained by the effect of heat removal from the walls of syringes. The higher the power of laser radiation, the less the effect of heat removal on the heating rate of the aqueous solution, and, accordingly, the time to reach the set temperature. Conclusion. In the energy regimes and volumes of the aqueous solution studied, the optical fiber with end radiation emission is not capable of causing carbonization and damage to surrounding tissues. Accordingly, contactless perforation of the cyst wall by laser radiation with a wavelength of 1.47 μm is impossible. The obtained data testify to the advisability of calculating the energy to reach the set temperature and keeping it for a period sufficient for coagulation transformation of the more external layers of education

Computer monitoring of the thermal effects induced by Er:YAG laser radiation during preparation of the hard tooth tissue

1993 ◽  
Author(s):  
Tatjana Dostalova ◽  
Otakar Krejsa ◽  
Helena Jelinkova ◽  
Karel Hamal ◽  
Ivan Prochazka ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Thermal Effects ◽  
Er:Yag Laser ◽  
Computer Monitoring ◽  
Tooth Tissue

scholarly journals Thermal effects of laser radiation in biological tissue

1983 ◽  
Vol 42 (1) ◽  
pp. 99-102 ◽  
Author(s):  
L. Cummins ◽  
M. Nauenberg
Keyword(s):  
Laser Radiation ◽  
Biological Tissue ◽  
Thermal Effects

Conditioning of Vitrified Bond CBN Grinding Wheels Using a Picosecond Laser

2014 ◽  
Vol 1017 ◽  
pp. 573-579 ◽  
Author(s):  
Ali Zahedi ◽  
Taghi Tawakoli ◽  
Javad Akbari ◽  
Bahman Azarhoushang
Keyword(s):  
Laser Radiation ◽  
Thermal Effects ◽  
Laser Scanner ◽  
Picosecond Laser ◽  
Grinding Wheel ◽  
Material Degradation ◽  
Wheel Surface ◽  
Selective Ablation ◽  
Vitrified Bond ◽  
Threshold Process

Laser ablation is a novel non-mechanical wheel preparation method for optimizing the treatment costs of superabrasive tools. In this study the thermal effects of picosecond laser radiation on CBN superabrasive grinding wheel surface is analytically and experimentally investigated. The analytical approach is intended to find threshold process parameters for selective ablation of cutting grains and bond material. It has been analytically and experimentally shown that, the extent of material degradation is defined by the maximum surface temperature induced by the laser radiation which is in turn defined by the laser beam energy. It is also suggested that, the depth of laser thermal effects is governed by the relative speed of the laser scanner with respect to the wheel surface.

scholarly journals State of Nonspecific Host Defense in Patients with Pyoinflammatory Diseases of Soft Tissues and Its Correction by Photomodification

2016 ◽  
Vol 23 (3) ◽  
Author(s):  
N. Zheliba ◽  
S. Khimich ◽  
R. Chornopyshchuk ◽  
I. Oshovskyy ◽  
P. Shevnya
Keyword(s):  
Laser Radiation ◽  
Host Defense ◽  
Inflammatory Process ◽  
Soft Tissues ◽  
Performance Factors

The results of research of performance factors of nonspecific defense of 116 patients with acute purulent inflammation of soft tissues were analyzed. The regularities of these parameters inhibition were detected depending on the severity of the inflammatory process. The use of the ultraviolet and laser radiation equally stimulates increase in the levels of factors of nonspecific host defense and promotes positive course of the disease.

scholarly journals THE USE OF LOW-INTENSITY RADIATION IN TREATMENT OF PERIODONTAL TISSUE DISEASES (LITERATURE REVIEW)

2021 ◽  
pp. 5-13
Author(s):  
E.M. Danko ◽  
Ye.Ya. Kostenko ◽  
S.B. Kostenko ◽  
V.V. Pantyo
Keyword(s):  
Laser Radiation ◽  
Soft Tissues ◽  
High Efficiency ◽  
Periodontal Diseases ◽  
Experimental Studies ◽  
Periodontal Tissue ◽  
Photodynamic Treatment ◽  
Periodontal Tissues ◽  
Low Intensity ◽  
Intensity Radiation

Topic relevance. Periodontal tissue diseases currently take a significant place among infectious diseases, both in dentistry and in medicine in general. Traditional methods of treatment of inflammatorydystrophic periodontal diseases do not bring the desired results, so the question arises of finding alternative, non-drug treatments. Among such means, special attention is paid to the use of various types of low-intensity radiation, as well as the cumulative effect of light and photosensitizers. The aim of the study is to analyze literary sources regarding the use of various types of low-intensity radiation in the treatment of periodontal tissue diseases. Materials and methods. The research and analysis of scientific literature on the basis of Google Scholar, Research Gate, Wiley Online Library and Academia.edu on the use of various types of radiation in the treatment of periodontal tissue diseases was carried out. Results and discussion. Laser radiation shows anti-inflammatory, antimicrobial, immunomodulatory and desensitizing effect, stimulates tissue reparation, and also reduces histohemmatic barriers in the inflammatory process, reduces gum hyperemia, which indicates the high efficiency of this method in optimizing the processes of restoring periodontal structures. With wavelengths of 630 and 870 nm, laser radiation at certain parameters increases the sensitivity of S. aureus and P.aeruginosa to commonly used antibiotics. With long-term exposure, PILER (polychromatic polarized incoherent low-energy radiation) has a similar effect on soft tissues, which improves the results of treatment of chronic catarrhal gingivitis in complex therapy, activates regenerative processes, reduces the spread and pain, normalizes immune processes. Polychromatic and monochromatic PILER shows a pronounced antimicrobial effect against opportunistic pathogens, although complete data on its use in periodontology is not yet available. LED radiation, in turn, also increases the sensitivity of conditionally pathogenic microorganisms to some antibiotics, causes improvement of oral hygiene indicators, bleeding of gums and stabilization of tooth mobility, inhibits the activation of pro-inflammatory cytokins, has a biostimulating effect on gum fibroblast and antiinflammatory effect. Experimental studies show that the use of low-intensity radiation and photosensitizers for photodynamic treatment (PDT) show significant improvement of treatment outcomes in periodontal patients. Thus, PDT in combination with mechanical cleaning of periodontal pockets leads to a significant decrease in their depth compared to traditional treatment methods. Conclusion. Application of various methods of irradiation of periodontal tissues using a certain dose of low-intensity radiation, wavelength and exposure, both individually and in combination with photosensitizers, can be employed in the treatment of inflammatory and inflammatory-dystrophic periodontal diseases as an effective antimicrobial method.

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