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Sökning: WFRF:(Twetman S.) > (2000-2004)

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  • Björnström, H, et al. (författare)
  • Fluoride levels in saliva and dental plaque after consumption of snacks prepared with fluoridated salt.
  • 2004
  • Ingår i: European journal of paediatric dentistry. ; 5:1, s. 41-5
  • Tidskriftsartikel (refereegranskat)abstract
    • AIM: To determine the concentration of fluoride in saliva and supragingival dental plaque at designated time intervals after consumption of snacks prepared with a standardised amount of fluoridated salt. STUDY DESIGN: The investigation had a single blind prospective crossover design. METHODS: A group of 11 healthy young adults volunteered to participate after verbal and written information and consent. After a 1-week fluoride depletion period, the subjects consumed popcorn prepared with either fluoridated (250 mg/kg) or non-fluoridated salt during 30 minutes. Unstimulated whole saliva and samples of supragingival plaque were collected before consumption (baseline) and at 30, 60 and 120 minutes after the intake. Fluoride concentration was determined with a fluoride-specific electrode and the post-ingestion levels were compared with baseline by ANOVA. RESULTS: In saliva, the mean fluoride concentrations at baseline ranged from 0.021 to 0.027 mg/L and after the 30 minutes consumption of fluoride prepared snacks a 15-fold increase (p<0.001) was found. The same pattern was disclosed in the plaque samples. In both saliva and plaque, the fluoride levels remained significantly elevated after 2 hours (p<0.001 and p<0.05, respectively). CONCLUSION: Consumption of snacks prepared with fluoridated table salt resulted in significantly increased fluoride levels in saliva and supragingival plaque for a period of at least two hours.
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  • Hänsel Petersson, G, et al. (författare)
  • Comparing caries risk factors and caries risk profiles in children and elderly.
  • 2004
  • Ingår i: Swedish dental journal. ; 28:3, s. 119-128
  • Tidskriftsartikel (refereegranskat)abstract
    • The aims of this study were to compare the caries risk profiles of children and elderly, the actual annual caries increment and the impact of some selected caries related factors. Another aim was to find out if there were gender differences among the participants. The risk profiles were created by a computerised risk assessment program, the Cariogram, which evaluates data and presents the weighted and summarized result as one figure, illustrating the ‘percent chance of avoiding caries’ in the future. Methods: The Cariogram was earlier evaluated in two longitudinal studies for its capacity to assess caries risk. One study comprised about 400 children, 10-11 years of age and the other study included about 150 elderly (age 55, 65 and 75). At baseline, information on past caries experience, diet, oral hygiene and use of fluoride was obtained. Saliva analyses included mutans streptococci and lactobacilli, buffering capacity and secretion rate. The caries risk was assessed and the participants were divided into five groups according to the calculated Cariogram risk profiles. After two and five years, respectively, caries was re-evaluated and the incidence was compared with the predictions. Results: The Cariogram risk predictions were statistically in agreement with the actual caries increment. Fifty percent of the children, but only two percent of the elderly appeared in the lowest caries risk group. Of the elderly, 26.4% belonged to the highest caries risk group versus 3.1% of the children. The median value ‘chance of avoiding caries’ was 44% for the elderly and 80% for the children. The main Cariogram sectors contributing to the observed higher caries risk among elderly was the bacterial components in combination with higher susceptibility. Individual factors contributing significantly to the higher risk profiles for the adults compared to the children were higher plaque scores, higher counts of mutans streptococci and lower buffering capacity. Conclusion: comparing the risk profiles of the children and the elderly showed that the elderly were at a higher risk developing caries lesions. Overall one may say that the risk for caries, as assessed by the Cariogram, was twice as high for the elderly.
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