Abstract: In the present paper the nonlinear optical model of dentin is proposed and described. The results of theoretical investigations of high-power light radiation propagation through dentin are reported. The numerical analysis of linear and nonlinear transmission of YAG:Nd laser radiation in dentin-like structures is carried out. The main result of this analysis is that dentin is able to change considerably the conditions of intensive light propagation that could lead to great changes of far-field axial intensity of laser radiation passed through dentin in the direction of dentinal tubule orientation. The results of numerical simulation are com pared with the results of experimental investigation of nonlinear transmission of intensive picosecond YAG:Nd laser pulses by dentin slice. It has been found out that dentin transmission index depends strongly on radiation intensity. The results of the numerical analysis of nonlinear dentin transmission are in agreement with experimental data obtained for intact dentin. The value of nonlinear refraction index of intertubular dentin is estimated. !4
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