RESUMO
Background and Aims: People in Lebanon turned to bottle water consumption because of its poor public water quality. In general, fluoride is known as dental caries preventive. A study in 1986 and two other national surveys in 1994 and 2004 showed that the concentration of fluoride in public Lebanese water was insignificant for the prevention of dental caries (less than 0.3 mg/L). The aim of the study was to measure the fluoride concentration in the highest selling and known commercial brands for bottled water in Lebanon, as well as to assess their effectiveness regarding prevention of dental caries. Result: Fluoride has a notable therapeutic effect but in small doses that fluoride can be found in drinking water. Analysis using an absorptiometry of 625nm and another technique using an Orion electrode of 9609 BN have shown the low content of fluoride in the Lebanese waters (less than 0.3 mg/l). Strategies have recently been evolved based on fluroide supplementation (if the results turn negative) to reduce the index of caries in LEBANON.
RESUMO
Physico – Chemical analysis of well and bore well water samples was carried out from ten sampling stations of Visakhapatnam District for a period of 1 year during different seasons in 2009. The analysis of different parameters namely- temperature, pH, color, electrical conductivity and fluoride were carried out as per standard methods. All the parameters studied were within the permissible levels except fluoride. The results indicate that fluoride content in some sampling stations ( S2 ,S7 , S14, S15 and S16) was found above standards probably due to seasonal variations and salt water contamination.
RESUMO
The purpose of this study was to compare the microhardness and the fluoride content of enamel and dentin around fluoride- or non fluoride-containing restorations. Forty extracted human teeth were used and prepared cervical cavities on proximal surface. Experimental teeth were divided into five groups. Group 1 : Prime & Bond NT and Z100, Group 2 : Prime & Bond NT and F2000, Group 3 : Scotchbond Multi-Purpose and Z100, Group 4 : Scothcbond Multi-purpose and F2000, Group 5 : Fuji II LC. The cavities were filled with dentin adhesives and restorative materials. After each tooth was bisected, one half was tested microhardness and the other half was analyzed the fluoride at the enamel and dentin by an EPMA-WDX device. The results were as follows: 1. There was no statistical difference among the microhardness of enamel surface in all group. 2. The microhardness at dentin of 100 microm point in Group 2 and 20 microm point in Group 4 was lower than that of normal dentin (p>0.05). 3. There was no statistical difference among the fluoride content of enamel surface in all group. 4. The fluoride content at the dentin of 30 microm point in Group 2 and 5 were higher than those at 100 microm and 200 microm point in Group 2 and normal dentin (p<0.05). 5. At the dentin of 30 microm point, Group 2 showed higher fluoride content than Group 1 and 3, and Group 5 showed higher fluoride content than other groups.