Browsing by Author "Abdou, Ahmed"

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    Color stability of two diferent resin matrix ceramics: randomized clinical trial
    (BioMed Central Ltd., 2023-08) Mahrous, Aliaa Ibrahim; Salama, Aya A; Shabaan, Alshaimaa Ahmed; Abdou, Ahmed; Radwan, Mohamed Mostafa
    Background One of the most common causes of aesthetic failure and restoration replacement is the tooth restorations color mismatch specifcally after aging. Methods One hundred and two participants with endodontically treated frst molar were selected clinically. The patients were randomly splited into two groups and restored either with Cerasmart hybrid ceramic or Vita Enamic polymer infltrated ceramic network (PICN) crowns and cemented using dual cure adhesive cement. The color difer- ence (ΔE) values after cementation at 0 (Baseline), 6, and 12 months of use were obtained by quantifcation of L*, a*, and b* values with a digital spectrophotometer. Mann–Whitney test used to compare between tested groups at each time point and between (α=0.05). Results At 6 months follow-up intervals, Vita Enamic group showed the highest signifcant ∆L* (p=0.035) and ∆a* (p<0.001) compared to Cerasmart group. ∆b* and ∆E showed no signifcant diference between both groups (p>0.05). Furthermore, all color parameters of both groups showed statistically signifcant diference at 12 months follow-up intervals. After 12 months, Vita Enamic restorations presented higher color change compared to Cerasmart restorations with a (p-value of 0.0120). When comparing the total color diference ∆Et through-out the follow-up intervals of Vita Enamic & Cerasmart groups, there were insignifcant diference (p=0.263). Conclusion Both hybrid materials demonstrated comparable color stability after 1 year of clinical service within clini- cal acceptance range. However, Cerasmart demonstrated a better colour stability after 1 year. Trial registration ClinicalTrials.gov (ID: NCT05501808) 15/8/ 2022- ‘retrospectively registered’.
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    Physical characteristics of two moisture tolerant fissure sealants immersed in commercial products with different pH range
    (Medknow Publications, 2019) I. Ezzeldin, Naglaa; F. Mohamed, Mona; Abdou, Ahmed
    Objective This study aimed to evaluate and compare between four physical variables (sorption, solubility, color change and fluoride release) for glass ionomer (GI) sealant against moisture tolerant resin sealant in solutions with different pH in different time intervals. Materials and methods Thirty discs were prepared from GI Fuji Triage and Embrace WetBond (EWB) resin sealant. Sorption, solubility and color change were measured after different time intervals (1 day, 1 week, and 1 month) of immersion of the specimens in different solution having different pH. In addition 10 disks were assessed for fluoride release of both sealants after being immersed in distilled water. Results EWB showed greater sorption in all media after 1 day and 1 week. GI sealant showed highest water sorption after 1 week and this sorption decreased again after 1 month. GI showed greater initial solubility in Pepsi and water after 1 day (P = 0.016). Pepsi showed higher solubility for EWB while no significant effect was found for GI with different media. The color change was greater for EWB when immersed in Pepsi and ginger. After 1-month storage, the color change was the highest specially for Pepsi for both sealants. Fluoride release was greater for GI compared to EWB. Conclusion Both sealants showed different physical performance depending on the type of immersion media and time period. This is expected to affect their mechanical properties and hence their clinical performance