Browsing by Author "Mohamed, Abdallah"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Effect of Different Glass-Ceramics and Resin Cement Curing Modes on the Color Stability of Sectional Laminate Veneers Following Artificial Aging
    (October university for modern sciences and Arts MSA, 2023-01) Mohamed, Abdallah; Naguib, Alaa; Fahmy, Nadia
    kground: The purpose of this study is to evaluate the effect of two glass ceramic materials and resin cement curing modes on the color stability of sectional porcelain laminate veneers following artificial aging. Methods: Forty sound human maxillary central incisors were prepared to receive sectional laminate veneers (SLVs) with a thickness of 0.5-0.7 mm. Prepared teeth were randomly divided into 2 equal groups according to ceramic materials used (N=20) as follows: Group I: IPS e.max press. Group II: Celtra press. Each main group was randomly subdivided into 2 equal subgroups according to resin cement used: light and dual cure resin cements (Relyx Veneer) (Relyx Ultimate) respectively. All samples were subjected to 10,000 cycles of thermo-cycling. Color change was measured by laboratory spectrophotometer before and after thermocycling. All the collected data were statistically analyzed by One-way ANOVA followed by Tukey’s post hoc test. Results: Color change between restoration and natural side of each sample before and after artificial aging did not reveal significant difference (P<0.05). IPS e.max press showed significant lower color stability with dual and light cure resin cement (ΔE 3.48- ΔE 3.4) than Celtra press (ΔE 2.6- ΔE 3.05). Light cured resin cement used with Celtra press showed statistically significant higher ΔE value than dual cured cement (P>0.05). Conclusions: Celtra press glass ceramic is more color stable than IPS e.max press. Resin cement and aging process influenced the color stability of sectional laminate veneers. Results were clinically accepted for all tested materials in reference to natural teeth (ΔE<3.5). The results may help the patient to aesthetically correct their anterior teeth with a suitable material providing strength and natural teeth looking, in addition to conservation of tooth structure, with optimum esthetics.
  • Thumbnail Image
    Item
    The impact of customers' orientation programs and customers' perception towards the brand on the customers' attitude applied on (KFC disability-operated branches)
    (MSA, 2022) Mohamed, Abdallah; Maged, Mario; Khaled, Omar; Maged, Sherif
    This research is aiming to study the impact of customers' orientation programs and customers' perception towards the brand in disability-operated branches on the customers' attitude This research’s data was obtained from both primary and secondary data, as the researchers reviewed and used previous academic articles studying the effect of hiring people with disabilities on the customers’ attitude in different aspect. The researchers also conducted in-depth interviews with two industry experts in order to obtain valuable insight about the effect of hiring people with disabilities, an online questionnaire was formed and answered by 274 respondents from both genders males and females with the purpose of measuring their opinion about the topic of hiring people with disabilities. Finally, the data obtained from the previous convenience methods were analyzed using SPSS program and Smart PLS program. The findings of this research indicated that customers’ orientation programs and customers’ perception towards the brand have an impact on the customers’ attitude in the aspect of dealing with disabled employees.