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Article
The Effect of Remineralizing Toothpastes on Enamel Surface Roughness after Hybrid Laser Bleaching (An In vitro Study)

Authors: Bahar Jaafar Selivany --- Fadi Al-Hano
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 4 Pages: 1-7
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: one of the complications of power bleaching is surface roughness of enamel which increases thepossibility of post bleaching teeth discoloration. The aim of the present study is to evaluate the effect of toothpastecontaining nano hydroxyapatite, NovaMin and kin sense fluoride on surface roughness of human tooth enamel afterlaser bleaching with 35% hydrogen peroxide bleaching gel.Materials and Methods: Twenty human enamel incisors were cleaned and their labial surface polished up to #1200,then categorized into four equal groups; first group kept without bleaching as a control group, while the remainingthree experimental groups were bleached with 35% hydrogen peroxide, and each group treated with a restorepaste containing one of the following: nano hydroxyapatite, NovaMin, and Kin fluoride. Bleaching was done withlaser hybrid system (DMC Whitening Lase II, Sao Paulo, Brazil). Enamel roughness values assessed by an atomic forcemicroscopy (AA3000, Bosten, USA) before and after treatment with restore tooth paste.Results: Paired t-test used to compare the mean roughness values before and after treatment with each restorepaste. One-way analysis of variance and Duncan post hoc tests used to determine the differences between meanroughness values of the groups. A p-value of 0.05 or less considered a significant. The results showed a highlysignificant statistical differences of remineralization of all types of restore tooth pastes.Conclusions: Nano hydroxyapatite past exhibiting a higher ability to reduce the surface roughness after laserbleaching than other tested pastes.


Article
Comparative Evaluation of Shear Bond Strength of Flowable Composite Bonded to Teeth Enamel with Laser Surface Treatment.

Authors: Abdulrahman K. Muhammed --- Makdad Chakmakchi
Journal: Journal of Oral and Dental Research مجلة طب الفم والاسنان ISSN: 23106417 Year: 2015 Volume: 2 Issue: 1 Pages: 24-31
Publisher: Iraqi Association for Oral Research الجمعية العراقية لبحوث طب الفم

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Abstract

Background: Acid etching of enamel appears to improve retention by selectively eroding certain hydroxyapatiteformations and facilitating penetration by the development of resin tags. Aim of study: To evaluate shear bond strength(SBS) of flowable composite to non-lased and lased groups, compare the (SBS) of flowable composite between Totaland Self-etch in non-lased and lased groups, and failure mode analysis.Materials and Methods: Forty bovine incisorswere used, enamel surfaces was grounded by silicon carbide paper and samples were randomly assigned into twomain groups (Group A: Non lased n=20, Group B: lased prepared n=20). Each main group was subdivided randomlyaccording to the adhesive systems that used which are: total-etch adhesive and self-etch adhesive, which were appliedto the prepared enamel surface according to manufacture instruction. Composite rod applied over the bonded area andcured. Samples were stored in distilled water at 370 for 24 hours. The evaluation of shear bond strength was employedby the use of universal testing machine. Results: The results of Student’s t-test showed that there was no significantdifference between the lased and non-lased enamel groups (P= 0.311). One–way ANOVA test and Duncan's MultipleRange test that compare shear bond strength between total and self-etch adhesives showed no significant differencein both lased and non-lased enamel groups. Conclusion: The mean shear bond strength and enamel surface etchingobtained with an Er,Cr:YSGG laser was not comparable to that obtained with non- lased enamel surface.


Article
Enamel defect of primary and permanent teeth in relation to nutrients daily intake among Down's syndrome children in comparison to normal children

Authors: Nada J. MH. Radhi --- Sulafa K. El-Samarrai --- Jassem T. Alkhafaji
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 3 Pages: 152-158
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Any child with Down's syndrome does not develop in the same manner as normal child. Therefore, thechild should not be viewed as being like everyone else. Developmental enamel defects in primary teeth have beenfound at least twice as frequently in disabled children as in control children. Down's syndrome consumed proteinmore than the recommended daily allowance compared to other disabled groups. Therefore, the aim of this studywas to investigate developmental defects of enamel and their relations to nutrient intake among Down's syndromechildren in comparison to normal children.Materials and Methods: A sample consisted of fifty institutionalized Down's syndrome children (study group) and 50normal children (control group) aged 7-10 years old. Enamel anomalies were assessed according to criteria of WHO(1997). The dietary history was assessed through the use of food frequency questionnaire. Nutrients analysis wasachieved by using a special software program designed by Diab (2003). All data were analyzed using SPSS version13.Results: A higher percentage of children with enamel anomalies were recorded among study compared to controlgroup. Demarcated opacities were the most distributed type in permanent teeth of the study group while diffuseopacities were the most distributed type among the control group. Most of nutrients showed weak negative nonsignificant correlations with enamel defects (demarcated opacities, hypoplasia) of primary teeth in study andcontrol groups (P> 0.05). Results revealed lower mean values of most of daily nutrients intake among the study groupthan the control group.Conclusion: This study reports a higher percentage of Down's syndrome children with enamel anomalies comparedto normal children which may explain a negative correlation with most of daily nutrients intake, this may indicatesthat those population in need of preventive dietary program

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