Pulsed CO2 laser-beam delivery and real-time temperature measurement via silver-halide fiber into biological in vitro samples: hystological analysis and internal temperature distributions calculatio

1994 ◽  
Author(s):  
Edward Belotserkovsky ◽  
Franco Canestri ◽  
Armand Abramovici ◽  
Jenny Horodniceanu ◽  
Abraham Katzir ◽  
...  
Keyword(s):  
Laser Beam ◽  
Temperature Measurement ◽  
Real Time ◽  
Co2 Laser ◽  
Silver Halide ◽  
Internal Temperature ◽  
Temperature Distributions ◽  
Pulsed Co2 Laser ◽  
Beam Delivery

scholarly journals Decontamination of Hard Tissue Using a Scanning Pulsed 9.3-µm CO2 Laser

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Ali Badreddine
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Dental Enamel ◽  
Polarization Microscopy ◽  
Cross Contamination ◽  
Cross Polarization ◽  
Hard Tissue ◽  
Colony Forming Units ◽  
Viable Bacteria

Purpose: The aim of the study was to evaluate the use of a scanning 9.3-µm CO2 laser beam to reduce or eliminate bacteria on hard tissue as a new method of non-specific decontamination to prevent cross-contamination during dental or medical procedures. Methods: A low energy level of a 9.3-μm CO2 laser beam was designed to deliver overall uniform photothermal energy in a 2-mm-diameter beam to eliminate bacteria on the surface of dental enamel without damaging the surface of the tooth. The study was conducted in two parts. The first part consisted of 10 human molars polished to a 1-μm finish and inoculated with S. mutans. The bacteria were stained with methylene blue and imaged through cross-polarization microscopy, and the area of the imaged surface containing bacteria was analyzed using ImageJ. The second part of the study consisted of 20 uncleaned extracted human molars used for evaluating cross-contamination of bacteria by measuring bacteria Colony Forming Units (CFU) ejected during an aerosol-generating procedure in vitro. Tryptic soy agar (TSA) plates were used to collect bacteria while cutting enamel. The TSA plates were incubated at 35o C for 24 hours, after which bacteria colonies were counted. Results: Examination using cross-polarization microscopy and imaging showed that the CO2 laser eliminated >98% of bacteria on the surface without altering the surface of teeth and similarly >98% in the aerosol/splatter from cutting of the enamel. Conclusion: The 9.3-μm CO2 laser resulted in nearly a complete elimination of viable bacteria.

Hollow core waveguide for high quality CO2 laser beam delivery: exploitation of bend-induced mode coupling

1995 ◽  
Vol 114 (3-4) ◽  
pp. 255-261 ◽  
Author(s):  
D. Su ◽  
S. Somkuarnpanit ◽  
D.R. Hall ◽  
J.D.C. Jones
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Mode Coupling ◽  
Hollow Core ◽  
High Quality ◽  
Beam Delivery

Effects of rapid pulsed CO2 laser beam on cortical bone in vivo

1992 ◽  
Vol 12 (6) ◽  
pp. 615-620 ◽  
Author(s):  
Ghazi M. Rayan ◽  
Denver T. Stanfield ◽  
Sandy Cahill ◽  
Stanley D. Kosanke ◽  
Joseph A. Kopta
Keyword(s):  
Laser Beam ◽  
Cortical Bone ◽  
Co2 Laser ◽  
Pulsed Co2 Laser

Laser rock drilling by a super-pulsed CO2 laser beam

2002 ◽  
Author(s):  
Z. Xu ◽  
C. B. Reed ◽  
R. A. Parker ◽  
B. C. Gahan ◽  
R. M. Graves ◽  
...  
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Rock Drilling ◽  
Pulsed Co2 Laser

New high power in-line, industrial CO2 laser beam instrumentation for real-time monitoring

2003 ◽  
Author(s):  
Lawrence I. Green ◽  
Gary Herrit ◽  
Huan Qi ◽  
Ashish K. Dasgupta ◽  
Peng Li ◽  
...  
Keyword(s):  
Laser Beam ◽  
Real Time ◽  
Co2 Laser ◽  
High Power ◽  
Real Time Monitoring
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