No abstract

The study evaluated the mechanical, tribological, and cytocompatibility properties of silver nanoparticles and titanium dioxide nanoparticles reinforced into polymethyl methacrylate resin. Both nanoparticles were separately ball-milled with polymethyl methacrylate, and a conventional compression molding technique prepared samples in a thermostatically controlled water bath. Samples were analyzed for flexural strength, polishability, three-body abrasive wear, surface hardness, and cytotoxicity. The fracture mechanics and surface roughness were further analyzed using a field emission scanning electron microscope. Most properties showed improvement at the said concentration compared to the control group, while few did not show property enhancement.The cell proliferation and viability were not compromised. Within study limits, silver nanoparticles and titanium dioxide nanoparticles reinforced polymethyl methacrylate resin positively influenced the dental polymer to a certain extent.The nanocomposite is cytocompatible at the tested concentrations. Prereaction of the polymer, treating nanoparticles with coupling agents, determining an optimal additive size and concentration, and use of effective dispersion technique may further enhance the properties of the nanocomposites.

No abstract

Background and Objectives:Two of the most critical factors affecting the prognosis of an avulsed tooth after replantation are extraoral dry time and the storage media in which the tooth is placed before treatment is rendered. The present study is undertaken to evaluate the periodontal ligament (PDL) cell viability after storage of teeth in different storage media, namely, coconut water, milk, and saline.Materials and Methods:Forty sound human premolars undergoing extraction for orthodontic purpose were selected. The teeth were allowed to lie dry on sand/mud for 30 min followed by which they were randomly divided and stored in three different media, i.e., coconut water, milk, and saline. After 45-min storage in their respective media, the root surface was then scraped for PDL tissue.Results:The ANOVA and Newman–Keuls post hoc procedure for statistical analysis of viable cell count under a light microscope using hemocytometer demonstrated that coconut water preserved significantly more PDL cells viable (P < 0.05) compared with milk and saline.Conclusion:Storage media help in preserving the viability of PDL cells when immediate replantation is not possible. This study evaluated the posttraumatic PDL cells’ viability following storage in three different storage media. Within the parameters of this study, it was found that coconut water is the most effective media for maintaining the viability of PDL.

Titanium and its alloys are being extensively researched and are applied relatively in different fields of dentistry since 1970s. Every property of this metal has proven to be useful in allied branches of dentistry like casting of removable partial denture frameworks, endosseous implants, in surgical reconstruction and orthodontics. Its inherent advantages like high strength, ductility, formability and weldability, low modulus of elasticity, ease of formation of oxidized surface layer, ability to retain mechanical integrity after autoclave and relatively low toxicity has led to extensive application of titanium and its alloys. The success of the treatment modality relies anyways on the knowledge of the properties required to employ them at the right situation. This article provides an insight into the properties of titanium and its alloys employed as a biomaterial for variety of purposes in dentistry with its definitive pros and cons.