Abstract
Purpose. To assess the effectiveness of laser Doppler flowmetry for the diagnostics of periodontal diseases when applying nonlinear dynamic processes in clinical practice. Material and methods. 62 patients aged 18-36 years were taken into the study. The control group consisted of 20 healthy individuals who had intact periodontium and no co-morbidities. Group I - 20 patients with chronic catarrhal mild gingivitis; Group II - 22 patients with chronic generalized mild periodontitis. Laser Doppler flowmetry (LDF) with the spectral wavelet analysis of the blood flow oscillations was performed with the apparatus LACC-02 (SPE «LAZMA», Russia). Relative energy fluctuations of blood flow E0 were assessed using the spectral analysis of LDF recordings (programme 2.2.509-SPE «LAZMA», Russia). The researchers also assessed nonlinear dynamic parameters of microcirculation in the periodontal tissue. Results and discussion. While studying characteristics of nonlinear dynamics, the researchers could assess oscillatory process parameters; they could also analyze them and thus, understand macroscopic characteristics of modulating factor behavior, both in the normal state and in the pathological one. Conclusion. Changes in microcirculation nonlinear parameters in the periodontal tissue under inflammation (groups I and II) are characterized by the decrease of chaotic behavior of the microcirculation system and its order on the base of randomness numerical parameters (Н 1 , D 2 Н, D 2 ) as well as by the sustainability of LDF signal (D 0 ).
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