Application of density functional theory for evaluating the mechanical properties and structural stability of dental implant materials.

BACKGROUND: Titanium is a commonly used material for dental implants owing to its excellent biocompatibility, strength-to-weight ratio, corrosion resistance, lightweight nature, hypoallergenic properties, and ability to promote tissue adhesion. However, alternative materials, such as titanium alloys (Ti-Al-2 V) and zirconia, are available for dental implant applications. This study discusses the application of Density Functional Theory (DFT) in evaluating dental implant materials' mechanical properties and structural stability, with a specific focus on titanium (Ti) metal. It also discusses the electronic band structures, dynamic stability, and surface properties. Furthermore, it presents the mechanical properties of Ti metal, Ti-Al-2 V alloy, and zirconia, including the stiffness matrices, average properties, and elastic moduli. This research comprehensively studies Ti metal's mechanical properties, structural stability, and surface properties for dental implants. METHODS: We used computational techniques, such as the CASTEP code based on DFT, GGA within the PBE scheme for evaluating electronic exchange-correlation energy, and the BFGS minimization scheme for geometry optimization. The results provide insights into the structural properties of Ti, Ti-Al-2 V, and zirconia, including their crystal structures, space groups, and atomic positions. Elastic properties, Fermi surface analysis, and phonon studies were conducted to evaluate the tensile strength, yield strength, ductility, elastic modulus, Poisson's ratio, hardness, fatigue resistance, and corrosion resistance. RESULTS: The findings were compared with those of Ti-Al-2 V and zirconia to assess the advantages and limitations of each material for dental implant applications. This study demonstrates the application of DFT in evaluating dental implant materials, focusing on titanium, and provides valuable insights into their mechanical properties, structural stability, and surface characteristics. CONCLUSIONS: The findings of this study contribute to the understanding of dental implant material behavior and aid in the design of improved materials with long-term biocompatibility and stability in the oral environment.

Impact of structured training program about Hospital Infection Control practices on Knowledge and Perception of nursing students at public and private nursing teaching institute of Northern India- An interventional study.

BACKGROUND: Hospital-acquired infections (HAIs) are a primary cause of illness and death and increased expenditure due to prolonged hospitalization and poor prognosis. HAI is a global safety concern, according to World Health Organization (WHO). This study assesses the current level of knowledge and perception regarding hospital infection control practices among nursing students and evaluates the impact of structured training interventions on their baseline knowledge and perception level. METHODS AND MATERIALS: It was a single group, a pre-post interventional study done on nursing students of one government and one private nursing college in the year 2021. A pretested questionnaire consisting of was used as a study tool. Various statistical tests like one repeated-measure ANOVA, Mauchly's Test of Sphericity, and Greenhouse-Geisser correction were used. RESULTS: The mean knowledge was minimum in the pretest group (Mean = 79.4430, SD = 17.49746) and maximum immediately after the training group (Mean = 96.5443, SD = 25.42322). But after one month, knowledge decreased; however, it was more than pre-training Knowledge (Mean = 84.4937, SD = 22.40313). CONCLUSIONS: Annual educational/training modules help retain knowledge in hospital infection control practices and HAI prevention. All healthcare workers need regular training.

Advances in mesenchymal stem/stromal cell-based therapy and their extracellular vesicles for skin wound healing.

Wound healing is a dynamic and complicated process containing overlapping phases. Presently, definitive therapy is not available, and the investigation into optimal wound care is influenced by the efficacy and cost-effectiveness of developing therapies. Accumulating evidence demonstrated the potential role of mesenchymal stem/stromal cell (MSC) therapy in several tissue injuries and diseases due to their high proliferation and differentiation abilities along with an easy collection procedure, low tumorigenesis, and immuno-privileged status. MSCs have also accelerated wound repair in all phases through their advantageous properties, such as accelerating wound closure, improving re-epithelialization, elevating angiogenesis, suppressing inflammation, and modulating extracellular matrix (ECM) remodeling. In addition, the beneficial therapeutic impacts of MSCs are largely associated with their paracrine functions, including extracellular vesicles (EVs). Exosomes and microvesicles are the two main subgroups of EVs. These vesicles are heterogeneous bilayer membrane structures that contain several proteins, lipids, and nucleic acids. EVs have emerged as a promising alternative to stem cell-based therapies because of their lower immunogenicity, tumorigenicity, and ease of management. MSCs from various sources have been widely investigated in skin wound healing and regeneration. Considering these features, in this review, we highlighted recent studies that the investigated therapeutic potential of various MSCs and MSC-EVs in skin damages and wounds.