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Study of The Adherence of St. mutans on Bleached and Fluoridated Tooth Surfaces. (An In Vitro Study)

Author: Sawsan H Al-Jubori
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 25 Pages: 116-121
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate Streptococcus mutans adherence on bleached enamel surface with (7.5% hydrogen peroxide , 16% carbamide peroxide) with or without topical fluoride theraby. Materials and Meth-ods: Sixty specimens obtained from thirty maxillary premolars extracted for orthodontic reasons, cleaned, polished, and examined for any surface structural damage. The roots were discarded and crowns sectioned in two pieces (mesiodistaly) using diamond separating disc in low speed hand piece. The specimens randomly divided into six groups and exposed to one of the bleaching agents (7.5% hydrogen peroxide , 16% carbamide peroxide) with or without topical fluoride application. The nega-tive control group specimens stored in deionized water. The positive control group specimens stored in artificial saliva. Adherence of Streptococcus mutans count to enamel surfaces was determined bacte-riologically. The data analyzed statistically using one way ANOVA and Tukey test (p≤0.05). Results: there is significant increasing in Streptococcus mutans adherence on enamel surface after bleaching procedure, which was decreased significantly when used fluoride application technique after bleach-ing. Conclusions: Topical fluoride therapy has beneficial effect on reducing the Streptococcus mutans adherence on enamel surface after bleaching regimens which attributed in reducing the possibility of dental caries


Article
Concentrations of selected elements in permanent teeth and enamel among a group of adolescent girls in relation to severity of caries

Authors: Shahba’a M. Al-Jorrani شهباء الجوراني --- Sulafa K. El- Samarrai سلافة السامرائي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 1 Pages: 176-180
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Human teeth considered to be an important etiological host factor in relation to dental caries throughits morphology and composition. Elements may incorporate in tooth structure during pre and post-eruptive periodchanging the resistance for caries. The aims of this study were to determine the concentration of selected major(Calcium and phosphorus) and trace elements (Ferrous iron, nickel, chromium and aluminum) in permanent teethand enamel among a group of adolescent girls in relation to severity of dental cariesMaterial and Methods: The study group consisted of 25 girls with an age of 13-15 years old referred by Orthodontistsfor extractions of upper first premolars (two sides). Tooth and enamel samples were prepared for chemical analysisaccording to method described by Lappalainen and Knuttila (1979). Dental caries was diagnosed by both clinicaland radiographical examinations following the criteria of D1-4MFS index described by Muhlemann (1976). All datawere analyzed using SPSS version 19.Results: The concentration of major elements in teeth and enamel (measured in % of dry weight) showed that Caions were higher than P ions. On the other hand the concentration of trace elements in teeth and enamel samples(measured in ppm) showed that Al ions was the highest followed by Ferrous Fe then Ni ions, while Cr ions were theleast in concentration. All elements showed statistically highly significant difference in concentration between teethand enamel samples. Ca/P ratio was higher in enamel than tooth, but the difference was statistically not significant.Major elements (calcium and phosphorus) in tooth and enamel samples recorded negative correlations with DMFS.Trace elements except chromium ions recorded positive correlations with DMFS. They were not significant except fornickel ions in tooth and aluminum ions in enamel.Conclusions: The presence of these elements in both teeth and enamel samples indicated that these elementspresent in our environment; as foods, water, and air so they incorporate through out the tooth layers during the preeruptiveperiod of tooth development, and incorporate the outer enamel surface during the demineralization andremineralization processes that occurs in the post-eruptive periods. Ca and p ions play an important role inmineralization of tooth and enamel. Cr ions may play a role in improving mineralization and crystallity of teeth, whileFe, Ni and Al may act as cariogenic elements

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