Morphological signs of the effectiveness of application sorbent in the treatment of purulent wounds (experimental study)

Objective. To prove experimentally the effectiveness of a new generation of application sorbent by studying the morphological changes during the wound process. Methods. Depending on the drug used to treat purulent wounds, we divided the animals into three groups. In the main group (group I) the study was performed on 20 rats, they used an application sorbent, which includes aerosil with immobilization on its matrix ornidazole (Patent of Ukraine for utility model № 115228). The comparison group (group II) consisted of 10 rats, which used the known sorbent "Gentaxan", which includes: gentamicin sulfate, L-tryptophan and zinc sulfate. The comparison group (group III) was 10 rats. In this group for the treatment of purulent wounds used 10% sodium chloride solution, followed by a transition to ointment "Levomekol", which includes chloramphenicol and methyluracil. Results. The results of the study show that in the main group already on the seventh day in comparison with the comparison groups was found granulation tissue with a large number of newly formed vessels of the microcirculatory tract and pronounced proliferation of fibroblasts, indicating acceleration of wound healing. In the comparison groups, the regeneration process was slower. Conclusion. Pathomorphological examination revealed that drugs with sorption properties contribute to a faster reduction of edema and inflammation, and treatment with application sorbent used in the main group, significantly accelerates the processes of connective tissue repair and wound epithelization, ie accelerates wound healing processes with comparison groups.

Preparation of Nanoparticle-containing Aligned Collagen Fibers for Dense Connective Tissue Repair and Regeneration

ABSTRACTNanoparticles (NPs) loaded with human platelet-derived growth factor (h-PDGF) were prepared and characterized. These NPs were co-assembled with collagen to form highly aligned NP-collagen composite fibers by using an electrochemical process. PDGF can be released gradually from either NPs or aligned NP-collagen fibers. This investigation demonstrated a novel way to fabricate highly aligned composite fibers, which can locally release a growth factor in a controlled and gradual manner, potentially avoiding the fast clearance of the growth factor from the implantation site. Thus, the aligned NP-collagen fiber is a novel and promising implantation material for tendon/ligament repair and regeneration.

Periodontal healing after Root conditioning using TTC-HCI or citric acid:

Tissue healing after periodontal therapy includes epithelial and connective tissue repair by producing biocompatible root surface. The objective of this study was to investigate whether etching solutions such as Tetracycline-hydrochloride (TTC-HCl) or citric acid might enhance the healing after periodontal therapy in rats. Periodontal defects were induced on the left maxillary 2nd molar in 36 Wistar rats. The periodontal attachment was reduced using a ligature model. The experimental sites were mechanically treated and delineated by blindly preparing a notch at the most apical aspect of the pocket using a Hedstroen endodontic file. The experimental sites were irrigated with a 10% tetracycline hidrocloride solution, an 8% citric acid solution, or a 0,9% NaCl solution (control) thus forming 3 groups of 12 animals each. The animals were euthanized at 3, 7 and 21 days post-treatment when block sections of the experimental sites were collected for histometric analysis. The histological observations describe normal wound maturation without regeneration in the defective site. Using a grid point counting method and two-way analysis of variance, it was shown that tissue fill in the notch did not differ significantly between sites irrigated with the acid solutions. However, tissue fill in these sites was significantly smaller than in the control sites. The results also showed that the area occupied by inflamed connective tissue was wider in the control compared to sites treated with the acid solutions. Based on these results it was concluded that irrigation with an acid solution could enhance healing following periodontal therapy

Acute Toxicity Evaluation of Proliferol: A Dose-Escalating, Placebo-Controlled Study in Swine

Prolotherapy is one of the many treatments available for chronic musculoskeletal disorders. A commonly used drug contains dextrose 12.5%, glycerin 12.5%, phenol 1.0%, and lidocaine hydrochloride 0.25% in aqueous solution (recently termed Proliferol). For chronic low back pain, this is injected into lumbosacral ligaments to stimulate connective tissue repair. Despite generally positive clinical results, the toxicity of this drug is not well characterized and was assessed in 48 (24 male, 24 female) Yucatan miniature swine randomly assigned to low (1×), medium (5×), or high (10×) dose or saline placebo. Outcomes included clinical observations, clinical chemistry, hematology, coagulation, urinalysis, toxicokinetics, and full gross and microscopic histopathology after 24 hours or 14 days. Findings attributable to Proliferol after 24 hours included dose-response elevations in alanine aminotransferase, aspartate aminotransferase, lactate dehydrogenase, and creatine kinase, which returned to normal after 14 days. There were no remarkable findings in hematology, coagulation, or urinalysis. Urine concentrations of lidocaine and phenol both peaked after 8 hours. Histopathology findings after 24 hours included hemorrhage, inflammation, necrosis, and vascular changes in the ligaments and adjacent soft tissues at the sites of injection. After 14 days, there was evidence of repair under way, with fibrosis and skeletal muscle regeneration at the injection sites.