ABSTRACT
The development of optical methods in modern medicine in the areas of diagnostics, therapy, and surgery has stimulated the investigation of optical properties of various biological tissues. The aim of this work is to investigate the feasibility of human teeth differentiation using laser, for this purpose, different laser sources have been used in order to compare their effect on the human teeth and consequently their accuracy in teeth differentiation .also, it is required to determine the type of laser that results in best accuracy. The experiment work in this research depends on using twenty human noncavitated caries lesion classified according to their class of caries. An ocean Blue HR2000 high resolution spectrometer is utilized to evaluate the optical properties of the teeth .the absorption coefficient are calculated under the effect of four excitation wavelengths (457 nm, 488 nm, 514 nm, and 633 nm). The results have showed that the argon laser at 488 nm is more sensitive for carious detection and it is the most suitable for human teeth ablation.