The paper presents the assessment of tooth decay prevalence in clinically homogenous groups of children receiving long-term preventive program (PP) in school dental facilities. Five-years PP were introduced in clinical practice in 2 Moscow schools. Preventive treatment was performed by dental hygienist. The results show that systematic preventive treatment in school dental offices starting from elementary school allows reducing dental caries incidence 46-53% and stabilize the incidence of caries complications. It should be mentioned though that analysis of individualized outcomes proves heterogeneity of study results despite of equal conditions of PP. Potentially significant hence is early diagnostics and treatment of initial caries forms as demineralization foci, especially in children with intensive tooth decay. Optimization of pediatric dentist and dental hygienist activity in school dental facilities is the main factor of caries prevention efficiency.
To evaluate the occupational hazard in use of mercury by dentists, the work environment and procedures of 22 dentists and their 33 assistants were surveyed. Determinations were made of a) the mercury vapour concentrations in the offices b) the urinary excretion of mercury by the 55 persons concerned c) the mercury concentration in blood. In three of the offices surveyed, mercury vapour concentration exceeded the threshold limit value of 0.05 mg/m3, implying a lack of care in handling mercury. Urinary mercury contents of one dentist and four dental assistants exceeded 0.05 mg/l i.e. the upper "normal" value for a population with no known exposure to mercury. The manner in preparation and handling of the amalgam were considered to be the predominant comtamination factor.