RESUMO
Structural properties of mixed saliva were studied in 30 persons 16-18 years of age divided into 3 groups (10 persons in each) according to different levels of tooth resistance to caries -- 1st with high level of resistance (DMFT=0), 2nd with medium level of resistance (DMFT=4.3+/-0.82), 3rd with low level of resistance (DMFT=6.6+/-0.92). The difference between DMFT figures in groups 2 and 3 was insignificant. In salivary filtrate (collected in the rest conditions and after 5 g sugar load) pH (by potentiometry) and optical density (by photoelectric colorimetry) were determined. 60 saliva samples were collected and 240 determinations were made. In was found that 5 g sugar intake led to structural changes of oral fluid in all groups with different levels of tooth resistance to caries. But in persons with 0 caries incidence the oral fluid micelle resistance and saliva mineralizing capacity were higher than in persons with medium and low resistance to caries. The received data may be used for revelation of oral mineral homeostasis mechanisms and forecasting pathology arising in cases of its disturbance and for planning preventive and curative measures with consideration of their corrections depending upon the level of the individual resistance to caries.
