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Effects of CO 2 laser beam on cortical bone
Author(s) -
Rayan Ghazi M.,
Pitha Jan V.,
Edwards Janet S.,
Everett Royce B.
Publication year - 1991
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.1900110112
Subject(s) - laser , cortical bone , materials science , chemistry , anatomy , biomedical engineering , optics , biology , medicine , physics
Sixteen bone blocks from two freshly amputated legs were used to study the effect of CO 2 laser on cortical bone. They were divided into two groups. In Group I, the blocks were treated with CO 2 laser using 1 mm spot (focused mode). In Group II, they were treated with CO 2 laser using 3 mm spot (defocused mode). Two other variables were investigated: the power and time of exposure. Three histologic zones were observed: a superficial zone with black particle deposits (carbonization), an intermediate zone with fibrillations and enlarged empty lacunae, and a deep zone with normal appearing bone. The bony changes in the first two zones combined were superficial in all specimens and did not exceed 200 microns. Increased energy, a focused beam, and time of exposure were all associated with increased matrix changes. CO 2 laser can be applied to cortical bone in vitro with minimal residual thermal damage.