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1 University of Oregon Dental School, Portland, Oregon
Fair reproducibility of hole diameter measurement in ground sections of human teeth after low-powered ruby laser beam impact indicated variations dependent on beam energy, target material and thickness, focus, magnification, working distance, and added stain concentration. Larger holes were produced in chalky enamel (as in beginning caries) than in nonchalky enamel. Dentin hole production was inconsistent unless sections were stained blue. Measurements may indicate factors requiring quantization before lasers of higher power are used on teeth.
Submitted on February 23, 1965
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