One of the great achievements in dentistry was the development of local anesthetics, which allow the accomplishment of painless dental treatment in most cases. However, administration of the anesthetic involves puncture of the tissue with needles and injection of the solution, which are painful procedures and strongly induce stress to patients. To minimize this discomfort, topical anesthetics are applied at the site prior to injection. However, despite the improvement in the quality of surface anesthesia induced by formulations lately developed, they are not effective for all types of anesthesia. Several advances have been achieved in the development of topical topical anesthetics for more effective topical use involving drug delivery systems. Among these systems, nanostructured lipid carriers (CLNs) are able to solubilize lipophilic actives, decrease toxicity and maintain the effect of in the target tissue for longer. The poloxamer 407 hydrogel (PL407) has thermoreversible and bioadhesive properties of great importance to prolong the residence time of the formulations, especially on the mucosal surface. Considering the possibility of achieving pulpal anesthesia through topical application, the literature demonstrates that the application of tetracaine associated with topical oxymetazoline, via the intranasal route, promotes pulpal anesthesia of maxillary teeth, including this combination was approved by the FDA in 2016 and marketed in the United States under the name KOVANAZE® (St. Renatus, LLC). In this way, this is a promising route for this purpose and little explored in the literature. In this sense, this project intends to evaluate if the performance of tetracaine is improved by its encapsulation in nanostructured lipid carriers dispersed in a thermo-reversible hydrogel based on PL407 (formulation previously developed and characterized in Dissertation defended linked to the present Thematic project) aiming at its future administration topical via the intranasal route with the aim of promoting pulpal anesthesia of maxillary teeth. Toxicity assays in culture of human glioblastoma cells (LN229); analysis of mechanical properties in vitro; ex vivo mucoadhesion assay, and evaluation of the permeation ability of the formulation through the nasal mucosa in Franz type vertical diffusion cells. The formulation is expected to exhibit low toxicity, good mechanical and mucoadhesive properties, and high ability to permeate the nasal mucosa.
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