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Comparative bactericidai exposures for selected oral bacteria using carbon dioxide laser radiation
Author(s) -
Dederich Douglas N.,
Pickard Michael A.,
Vaughn Allison S.,
Tulip John,
Zakariasen Kenneth L.
Publication year - 1990
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.1900100612
Subject(s) - bacteria , irradiation , laser , carbon dioxide , carbon dioxide laser , radiation , chemistry , food science , microbiology and biotechnology , biology , optics , ecology , laser surgery , genetics , physics , nuclear physics
Although relatively high CO 2 laser energies have been shown to sterilize root canals, the response of several bacterial strains to decreasing exposures of CO 2 laser energy remains unknown. Freshly grown bacterial cells were irradiated on glass microscope coverslips. A comparison of equivalent energy exposures with differing parameters was made on the bacterial viability. No statistically significant difference was found in the energy required to kill closely related bacterial species. However, the energy density required to kill greater than 99.5% of the bacteria is less than 200 J/cm 2 , much less than that shown to sterilize in a previous study.