FLUORIDE CONCENTRATION AND OTHER ELEMENTS IN TOOTH STRUCTURE AND ITS EFFECT ON DENTAL CARIES IN KIRKUK, IRAQ
The study involved the determination of fluoride and other elements like Mn, Na, Mg, Si, K, Ca, Fe, Al, Cl and some trace elements (Cr, Cd, Ni, Zn, Pb, Sr, As, Co, Cu, Mo and Se) in 220 teeth samples with age group ranging from 6–45 year. The average concentration of fluoride in samples were less than the global average, and the total contents of fluoride in the children deciduous teeth are relatively higher than that of permanent teeth. The infection rate of dental caries in children seen in age between 6–11 years and increasing after the age of 12 due to certain environmental factors, age, water and food quality, so there is a strong relationship between the rising amount of fluoride concentration in the area and reducing the rate of dental caries. The study also determines the different limits and importantly the optimum value of fluoride concentration in drinking water of Kirkuk City which is done by correlation with the mean value of the maximum daily temperature of the city over the last five years, and also taking in consideration that human gets the fluoride from a different source such as food, air and tooth paste, so we correlate our finding with the rate of fluoride taken from other sources which not greater than 6mg/day, according to World Health Organization (WHO), in order to avoid the hyper fluorosis (excess fluoride).