Fluoride Distribution in the Cementum and Dentine in Human Adults from a Naturally Fluoridated Area and a Non-Fluoridated Area.

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• The purpose of the study was to examine the effect of water fluoride content on the fluoride profile across the entire thickness of the cementum and root dentine of human permanent anterior teeth using an abrasive micro-sampling technique (Weatherell et al. 1985). Twenty eight human permanent anterior teeth, aged from 30 to 60 years were analyzed. One group was obtained from a naturally fluoridated area (West-Hartlepool in the UK: fluoride content in drinking water 1.0-1.3 ppm) and the other from a non-fluoridated area (Leeds in the UK: fluoride content in drinking water is less than 0.1 ppm). A slice, about 300μm thick was prepared bucco-lingually on a slide of 28 human permanent anterior teeth. Each specimen was divided into 3 parts, one near thecement-enamel junction (CEJ), a second at the middle of the root dentine, and a third near the root apex. Using a thine diamond disk, parallel blocks of tissues about 1 mm wide were cut under a dissecting microscope. Layers of cementum and root dentine were abraded using abrasive micro-sampling until the pulpal surface of the root dentine was reached. Fluoride and phosphorus contents were determined for each sample. The results were as follows;<BR>1) Fluoride concentration was higher in teeth samples taken from the naturally fluoridated area (WHP) than from the non-fluoridated area (LDS).<BR>2) Average fluoride concentration and age had a positive correlation in WHP dentine middle region (r=0.79, p<0.001) and in the apex region (r=0.61, p<0.05), and in WHP cementum cervical region (r=0.67, p<0.01).<BR>3) An analysis of variance suggested that the area, age and number of years lived in the area combined with age were significant.<BR>We concluded that the WHP group had a higher fluoride concentration than the LDS group in cementum and root dentine throughout life, suggesting that topical and ingested fluoride application are effective in preventing adult root surface caries.

• 有限責任中間法人 日本口腔衛生学会の論文

有限責任中間法人 日本口腔衛生学会 | 論文

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