Faculty of Dentistry

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The Influence of Thermocycling on the Marginal Adaptation of Different Glass Ceramic Sectional Veneers
(October university for modern sciences and Arts (MSA), 2022-07) Tantawy, Ahmed Amer; Fahmy, Nadia Zakria; Saad, Aya Ahmed
Background: Sectional veneers constructed from different glass ceramic can show variations in the marginal adaptation before and after thermocycling. Methodology: 20 human central incisors were used to fabricate sectional laminate veneers SLV with preparation depth 0.5mm cervically and 0.7mm incisally. Samples were divided equally into groups according to material Group 1: Lithium disilicate Glass-Ceramic (IPS e-max press, Ivoclar, Schaan Liechtenstein) (n=10) and Group 2: zirconia reinforced lithium silicate Glass-Ceramic (Celtra Press, Dentsply Sirona) (n=10). SLV were bonded to the teeth using lightcure resin cement (Relyx veneer) (3M ESPE, Seefeld, Bayern, Germany). The samples were then subjected to 10,000 thermal cycles, the marginal adaptation was measured before and after thermocycling using stereomicroscope under magnification 40X using 8 measurement points for each margin (incisal, proximal, cervical and mid labial in two different positions) with total of 40 point per sample. Results: The results of ANOVA showed a significant interaction between material and thermocycling. Before thermocycling, e.max samples showed statistically significant higher gap values with (p<0.001) Mean and standard deviation (SD) values (34.80±0.71) than Celtra samples with (p<0.001) (26.33±2.28). While after thermocyling, Celtra samples had significantly higher gap values (53.77±6.67) than e.max samples (42.81±1.67). Conclusions: IPS e.max Press SLV showed better marginal adaptation compared to that of Celtra Press after thermocycling. Insufficient sealing between restoration and tooth may lead to leakage and marginal discoloration in sectional veneers after years of service. © 2022 MSA. All rights reserved. ∗ Corresponding author. E-mail address: drahmedamer@outlook.com 1 Master Degree in Faculty of Dentistry, October University for Modern Sciences and Arts 2 Professor of Fixed Prosthodontics, Faculty of Dentistry, October University for Modern Sciences and Arts 3 Lecturer of Fixed Prosthodontics, Faculty of Dentistry, October University for Modern Sciences and Arts
Post COVID-19 Mucormycosis: Review of Literature
(October university for modern sciences and Arts (MSA), 2022-07) Abdelhady, Youmna Mohamed; Magdy, Karen; Hussein, Seif; Assad, Yomna; Hamdy, Mohamed
Mucormycosis is a fatal fungal infection which emerges as a serious complication of COVID-19. It increased significantly in prevalence in the last few years especially in immunocompromised patients. Clinically, it has different types, pulmonary mucormycosis, Gastrointestinal tract mucormycosis, renal mucormycosis, Cutaneous mucormycosis, disseminated mucormycosis, but the most common type to develop is Rhino-orbital-cerebral-mucormycosis (ROCM). A fast definitive diagnosis is the most critical step to determine the type of treatment with either a surgical or pharmacological approach and to confine the spread of the infection to neighboring tissues to achieve a better prognosis with reconstruction of affected area and decrease the rate of mortalities. The aim of this review is to discuss mucormycosis based on evidence from 1957 until 2022 taken from different countries, to shine light on causative factor, clinical presentation, radiographic appearance, its classifications and treatment using surgical and pharmacological pathways, also show the recent reconstruction methods performed, as well as its mortality rate.
Assessment of Marginal Adaptation of Two CAD/CAM Glass Ceramic Occlusal Veneers at Different thickness After Thermodynamic aging
(October university for modern sciences and Arts (MSA), 2022-07) Abouhagar, khaled Reyad; Salma, Aya Ahmed; Fahmy, Nadia Zakria
Background: Occlusal veneers fabricated with different materials and thicknesses can reveal different marginal adaptation after thermodynamic aging. Methodology: Extracted maxillary premolar teeth (n=28) were collected and embedded in epoxy resin block with light body material then randomized according to materials into two groups (n=14): Lithium disilicate IPS e.max CAD (A) and Zirconia reinforced lithium silicate Celtra Duo (B) then further randomized into four subgroups (n=7) according to occlusal veneer thicknesses 1 mm and 1.5 mm. Teeth were prepared by a customized milling machine then the exposed dentine was immediately sealed by dentine bonding agent. Fabrication of the occlusal veneers was done by CAD/CAM milling machine. Occlusal veneers were adhesively cemented by dual cure resin cement (Panavia F 2.0). All samples were subjected to thermocycling and cyclic loading equivalent to one year of service (150,000). Marginal gap measurements then were done with A digital microscope at 35x magnification was used to photograph each specimen. Marginal gap was measured and evaluated using a computerized image analysis system. Results: two-way ANOVA showed that the materials only IPS e.max CAD (39.30±5.14) had significantly higher value than Celtra Duo (31.52 ± 5.69) (p<0.001). While regarding the thicknesses 1 mm thick samples (36.78 ± 6.06) had significantly higher value than 1.5 mm thick samples (34.04 ± 7.02) (p=0.020). Conclusion: Zirconia reinforced lithium silicate (Celtra DUO) occlusal veneers showed better marginal adaptation than lithium disilicate (IPS e.max CAD) in different thicknesses. Zirconia reinforced lithium silicate (Celtra DUO) marginal adaptation was influenced by occlusal veneer thickness (the thicker 1.5 mm showed better adaptation than 1mm.
Effect of Different Types of Implant Coating and Surface Treatment on Implant Stability
(MSA university faculty of dentistry, 2022-10-27) Amin, Ola Abdelsamad; Elsherbiny, Omar Mahmoud; Hassab, Fatma El-Zahraa Ayman Ahmed; Adly, Marina Maged; Ismail, Mohamed Hamdy Mahmoud
Implant surface design has evolved to meet oral rehabilitation challenges in both healthy and compromised bone. For example, to overcome dental implant-related complications, peri-implantitis, and subsequent implant loss, implant surfaces were modified to introduce desired properties to dental implants and thus increase their success rate and expand their indications. Until now, a diversity of implant surface modifications, including different physical, chemical, and biological techniques, have been applied to a wide range of materials, such as titanium, zirconia, and polyether ether ketone, to achieve these goals. Ideal modifications enhance the interaction between the implant’s surface and its surrounding bone which facilitates osseointegration while minimizing bacterial colonization to reduce the risk of biofilm formation. This review article aims to discuss currently available implant surface modifications in terms of their impact on osseointegration and biofilm formation, which is important for implantologists to choose the most suitable materials to improve implant success and survivability.
Effect of Two Remineralizing Agents on Artificial Demineralized Enamel Irradiated with Er, Cr:YSGG Laser: In-Vitro Study
(October university for modern sciences and Arts (MSA), 2022-11) Abdulla, Nada Mohamed; Mohamed, Mona; Abdel Mohsen, Mohamed Mahmoud
Background: Dental caries is a widespread, noncommunicable disease affecting half of world’s population. Thus, prevention rather than mere treatment of dental caries has become a decisive goal in dentistry. Therefor the adequacy of laser (Erbium, chromium-doped yttrium, scandium, gallium and garnet) irradiation and remineralizing agent were tested on artificially demineralized enamel. Methodology: Twenty human molars were selected, scaled, polished and sectioned into two equal buccal and lingual sections (n=40). Surfaces were coated with acid resistance nail varnish except for enamel window of 4x4 mm. The specimens were embedded in demineralizing solution for 3 days. They were randomly divided into two groups (n=20) according to type of remineralizing agent, group (MI): MI paste plus and group (RE): Remin Pro. They were applied according to manufacturer’s instructions. The groups were then divided into two subgroups (n=10); groups (MIL) and (REL). In both groups specimens were treated first with Er, Cr: YSGG Laser then remineralizing agents were applied. The weight % of Calcium and Phosphate were measured using EDX. The measurements were done before any treatment (control group), after demineralization and after remineralization. Representative specimens were selected for scanning. Results: The results of the study showed that (MI, RE and MIL) weren’t able to restore the minerals compared to the control group. While REL group was the only group similar to the control group. In addition, the intergroup comparison showed that REL had the highest remineralization compared to other groups. Conclusions: The combined use of laser and remineralizing agents improved enamel remineralization
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.
Treatment Modalities for Molar Incisor Hypomineralization MIH: A Narrative Review
(October university for modern sciences and Arts MSA, 2023-01) Saleem, Hagar; Abouzeid, Menna Ashraf; Aly, Ghada Mohamed Mahmoud
Molar incisor hypomineralization (MIH) is a clinical appearance of hypomineralization with systematic origin affecting the first permanent molars (FPMs) and usually related with hypomineralized incisors. Unfortunately, this condition affects the functions as well as the aesthetics of patients such as dental caries and post-eruptive enamel breakdown not only that, but it also creates treatment challenges to the dentists. Restorations in the cases of MIH seems to fail more often; there is few science-based literature to support clinical decisions on cavity design and material selection. The pervasiveness of MIH and the deficiency of literature regarding treatment modalities indicate the need for further researches to clarify proper guidelines for management of MIH cases and enhance the durability of restorations in affected teeth. The objective of the present study was to comprehensively review the various modalities presented in literature that were used to treat MIH in children.
A Novel Approach for Maxillary Rehabilitation and Esthetic Problem Solving in Egyptian Patient - Case Report
(October university for modern sciences and Arts MSA, 2023-01) Alaa, Dina; Wagdy, Shereen; Ahmed, Nourhan
Background: Tooth loss due to caries and or vertical bone loss are a common phenomenon among middle age Egyptians which require esthetic and surgical management . This case report discusses the management of restoring missing teeth and esthetic smile makeover with vertical bone loss. Methodology: Thorough patient assessment was followed by taking impression, diagnostic casts and radiographic examination including cone beam CT. After patient agreement on the proposed treatment plane, open and close sinus lift surgeries followed by implants and monolithic zirconia full coverage restorations in addition to restoration of carious teeth were carried out. The patient was followed up for one year postoperatively. Conclusion: Esthetics and function were restored successfully with a combination of surgical and prosthetic interventio

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