[Relationship between caries resistance in permanent teeth of the Wroclaw school children and the length of time of drinking-water fluoridation]. / Relation entre la résistance des enfants des écoles de Wroclaw à l'éqard de le carie des dents permanentes.

The age at which carious permanent teeth are equally distributed between upper and lower jaw depends upon the caries resistance of the individual. This age was called the "characteristic age" of the population. It was found that water fluoridation in Wroclaw (1967) postponed this characteristic age by two years. In females, this age is earlier than in males. This method is useful in the appredication of the caries susceptibility of a population. The effect of water fluoridation upon this susceptibility was shown. Caries resistance was found to be higher in males.