Temperature field modeling during multi-modes CO2 laser irradiation of human enamel

2007 ◽  
Vol 39 (3) ◽  
pp. 537-540 ◽  
Author(s):  
Oane Mihai ◽  
Florea Scarlat ◽  
Ion N. Mihailescu
Keyword(s):  
Temperature Field ◽  
Laser Irradiation ◽  
Co2 Laser ◽  
Field Modeling ◽  
Human Enamel

In situ Mineral Loss Inhibition by CO2 Laser and Fluoride

2006 ◽  
Vol 85 (7) ◽  
pp. 617-621 ◽  
Author(s):  
L.K.A. Rodrigues ◽  
M. Nobre dos Santos ◽  
J.D.B. Featherstone
Keyword(s):  
Laser Irradiation ◽  
Laser Treatment ◽  
Co2 Laser ◽  
Sucrose Solution ◽  
Treatment Groups ◽  
Enamel Demineralization ◽  
Human Enamel ◽  
Fluoride Dentifrice ◽  
Mineral Loss

Laser and fluoride treatments have been shown to inhibit enamel demineralization in the laboratory. However, the intra-oral effects of this association have not been tested. This study assessed in situ the effect of a Transversely Excited Atmospheric CO2 laser (λ = 9.6 μm) and the use of pressure fluoridated dentifrice on enamel demineralization. During two 14-day phases, 17 volunteers wore palatal appliances containing human enamel slabs assigned to treatment groups, as follows: (1) non-fluoride dentifrice, (2) CO2 laser irradiation plus non-fluoride dentifrice, (3) fluoride dentifrice, and (4) CO2 laser irradiation plus fluoride dentifrice. A 20% sucrose solution was dripped onto the slabs 8 times per day. The specimens treated with laser and/or fluoridated dentifrice presented a significantly lower mineral loss when compared with those from the non-fluoride dentifrice group. The results suggested that CO2 laser treatment of enamel inhibits demineralization in the human mouth, being more effective when associated with fluoride.

Effect of CO2 laser irradiation on arc welding

1996 ◽  
Author(s):  
Nobuyuki Abe ◽  
Yasuo Agano ◽  
Masahiro Tsukamoto ◽  
Takeshi Makino ◽  
Masakazu Hayashi ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Co2 Laser ◽  
Arc Welding

Initial Dissolution Rate Studies on Dental Enamel after CO2 Laser Irradiation

1992 ◽  
Vol 71 (7) ◽  
pp. 1389-1398 ◽  
Author(s):  
J.L. Fox ◽  
D. Yu ◽  
M. Otsuka ◽  
W.I. Higuchi ◽  
J. Wong ◽  
...  
Keyword(s):  
Dissolution Rate ◽  
Laser Irradiation ◽  
Co2 Laser ◽  
Dental Enamel ◽  
Initial Dissolution Rate

Fast Ion and Neutron Emission in CO2 Laser Irradiation of Solid Deuterium Targets

1977 ◽  
pp. 657-675
Author(s):  
J. L. Bocher ◽  
J. P. Elie ◽  
J. Martineau ◽  
M. Rabeau ◽  
C. Patou
Keyword(s):  
Laser Irradiation ◽  
Co2 Laser ◽  
Neutron Emission ◽  
Solid Deuterium ◽  
Fast Ion

Behavior of different PMMA qualities under CO2 laser irradiation

1993 ◽  
Author(s):  
Rene C. Joeckle ◽  
Bernard Gautier ◽  
Fabrice Lacroix ◽  
Stephane Clemens ◽  
Lam Thanh My
Keyword(s):  
Laser Irradiation ◽  
Co2 Laser

scholarly journals Threshold of permanent cornea thermal damage due to incidental continuous wave CO2 laser irradiation

2010 ◽  
Vol 14 (2) ◽  
pp. 459-467 ◽  
Author(s):  
Mayada Tahir
Keyword(s):  
Laser Irradiation ◽  
Co2 Laser ◽  
Thermal Damage ◽  
Continuous Wave ◽  
Anterior Part ◽  
Outer Part ◽  
Human Cornea ◽  
Thermal Dose ◽  
Element Analysis ◽  
Reflex Blink

Cornea thermal damage due to incidental continuous wave CO2 laser irradiation is studied numerically based on bio-heat equation. The interaction of laser with tissue leads to a rapid temperature increased in target and the nearby tissue. As the temperature of the eye surface reaches 44?C, a sensation of pain will cause aversion response of the reflex blink and/or shifting away from the source of pain. The aim of the work is to predict numerically the threshold limit of incidental laser power that causes damage to the anterior part of the cornea, which can be healed within 2-5 days as long as damage is not exceeding the outer part of the eye (epithelium). A finite element analysis is used to predict temperature distribution through the cornea where the necroses region can be obtained using thermal dose equation. The thermal dose that required for damaging the cornea is predicted from previously published experimental data on rhesus monkeys and used later as a limit for shrinkage to human cornea. The result of this work is compared by international standard of safety and a good nearby result is obtained which verified the result of this work.

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