رضوان علي كاطع

In this method, a sustainable and reusable nanocatalyst, GO/MNPs-Met-Pd(0), was developed by anchoring Pd(0) complexes onto metformin-functionalized graphene oxide-magnetic nanoparticles. Comprehensive characterization using FT-IR, XRD, VSM, SEM, TEM, TGA, BET, EDX, elemental mapping, and ICP-OES confirmed the catalyst’s structure and composition. The catalytic performance of GO/MNPs-Met-Pd(0) was evaluated in two multicomponent reactions for the efficient synthesis of quinoline-4(1H)-one and flavone derivatives. Conducted in ionic liquid media, the reactions yielded quinoline-4(1H)-ones (15 examples) with 88–99% yields and flavones (12 examples) with 85–98% yields. The catalyst demonstrated excellent reusability with minimal activity loss over multiple cycles. These results highlight GO/MNPs-Met-Pd(0) as a highly efficient, selective, and eco-friendly catalyst for the sustainable …

The objective of this article is to provide a thorough examination of the evolution of dental zirconia, encompassing its varieties, characteristics, uses, and methods of cementation. A thorough exploration of PubMed and Embase databases was undertaken. The inquiry was restricted to articles published in the English language. The ultimate search took place in October of 2021. Recently created monolithic Zirconia ceramics have greatly improved aesthetics and transparency. Yet, it is imperative to conduct additional in vitro and in vivo research to ascertain the material’s capacity to sustain its outstanding attributes over the long term. As per the existing literature, monolithic translucent Zirconia has demonstrated encouraging outcomes and a notable rate of longevity. Therefore, this material is recommended for situations where both strength and aesthetics are required. Advancements in both the materials and techniques for cementing monolithic Zirconia have substantially improved, prompting dentists to consider using this material, particularly in situations where a conservative approach is needed. Zirconia restorations exhibited positive results, especially in the case of monolithic Zirconia crowns supported by implants and fixed dental prostheses.

At present, titanium dioxide nanoparticles (TiO2 NPs) find effective application in human consumables, pharmaceuticals, beauty products, cutting-edge healthcare, and dental care due to their non-toxic, non-allergenic, and biocompatible properties when in direct proximity to the human body. These NPs exhibit exceptional versatility in terms of their satisfactory chemical steadiness, cost-effectiveness, potent oxidation characteristics, elevated refractive index, and improved visual appeal. These NPs are produced using traditional techniques (both physical and chemical) as well as modern biological methods (biological, eco-friendly, and derived from biological sources), each carrying its own set of strengths and weaknesses in this current era. The importance of TiO2 NPs in the medical field encompasses applications in drug delivery, cancer treatment, orthopedic implants, biosensors, instruments, and devices. In dentistry, they play a crucial role as biomaterials in items like toothpaste, oral antibacterial solutions, teeth whitening products, and adhesives. Furthermore, TiO2 NPs hold a significant position in various dental specialties. They are utilized in orthodontics for wires and brackets, in endodontics for sealers and obturating materials, in maxillofacial surgeries for implants and bone plates, in prosthodontics for veneers, crowns, bridges, and acrylic resin dentures, and in restorative dentistry for glass ionomer cement (GIC) and composites.