Efficiency analysis of commercial polymeric membranes for bone regeneration in rat cranial defects.

PURPOSE: To evaluate the in vivo efficiency of commercial polymeric membranes for guided bone regeneration. METHODS: Rat calvarial critical size defects was treated with LuminaCoat (LC), Surgitime PTFE (SP), GenDerm (GD), Pratix (PR), Techgraft (TG) or control (C-) and histomorphometric analysis determined the percentage of new bone, connective tissue and biomaterial at 1 or 3 months. Statistical analysis used ANOVA with Tukey's post-test for means at same experimental time and the paired Student's t test between the two periods, considering p < 0.05. RESULTS: New bone at 1 month was higher for SP, TG and C-, at 3 months there were no differences, and between 1 and 3 months PR had greater increase growthing. Connective tissue at 1 month was higher for C-, at 3 months for PR, TG and C-, and between 1 and 3 months C- had sharp decline. Biomaterial at 1 month was higher for LC, in 3 months for SP and TG, and between 1 and 3 months, LC, GD and TG had more decreasing mean. CONCLUSIONS: SP had greater osteopromotive capacity and limitation of connective ingrowth, but did not exhibit degradation. PR and TG had favorable osteopromotion, LC less connective tissue and GD more accelerated biodegradation.

Efficiency analysis of commercial polymeric membranes for bone regeneration in rat cranial defects

Purpose: To evaluate the in vivo efficiency of commercial polymeric membranes for guided bone regeneration. Methods: Rat calvarial critical size defects was treated with LuminaCoat (LC), Surgitime PTFE (SP), GenDerm (GD), Pratix (PR), Techgraft (TG) or control (C-) and histomorphometric analysis determined the percentage of new bone, connective tissue and biomaterial at 1 or 3 months. Statistical analysis used ANOVA with Tukey's post-test for means at same experimental time and the paired Student's t test between the two periods, considering p < 0.05. Results: New bone at 1 month was higher for SP, TG and C-, at 3 months there were no differences, and between 1 and 3 months PR had greater increase growthing. Connective tissue at 1 month was higher for C-, at 3 months for PR, TG and C-, and between 1 and 3 months C- had sharp decline. Biomaterial at 1 month was higher for LC, in 3 months for SP and TG, and between 1 and 3 months, LC, GD and TG had more decreasing mean. Conclusion: SP had greater osteopromotive capacity and limitation of connective ingrowth, but did not exhibit degradation. PR and TG had favorable osteopromotion, LC less connective tissue and GD more accelerated biodegradation.

Development and characterization of poultry collagen-based hybrid hydrogels for bone regeneration.

PURPOSE: Poultry by-products can contribute as an innovative natural source for the development of composites based on polymers and minerals aiming at bone regeneration. The objective of this study was the physicochemical and biological characterization of collagen-based hydrogels crosslinked with ultraviolet (UV)-riboflavin. METHODS: Pure hydrogels of 100% collagen (G1) or hybrid hydrogels, 90% collagen:10% apatite (G2), 90% collagen:10% nanokeratin (G3), and 90% collagen:5% apatite:5% nanokeratin (G4) were characterized by scanning electron microscope, Fourier-transform infrared spectroscopy, differential scanning calorimetry, swelling degree and quali-quantitative histological analysis. Ectopic implantation in subcutaneous tissue in mice at one, three and nine weeks allowed to assess the inflammation (neutrophils, lymphocytes, macrophages, and giant cells) and repair (neovascularization, and connective tissue) to determine biocompatibility and the integrity of biomaterials to score their biodegradability. Histomorphometry on critical size defects in rat calvaria at one and three months evaluated the percentage of bone, connective tissue, and biomaterials in all groups. RESULTS: The hydrogels presented porous microstructure, water absorption and physicochemical characteristics compatible with their polymeric and/or mineral composition. All materials exhibited biocompatibility, biodegradability, and low osteoconductivity. G2 showed greater density of new bone and biomaterial than the G1, G3 and G4. CONCLUSIONS: The collagen-apatite group formulation suggests potential for development as osteopromoting membrane.

Avaliação microbiológica da água consumida em bebedouros da Universidade Estadual Vale do Acaraú, Sobral – CE / Microbiological evaluation of the water consumed in drinking of the University Vale do Acaraú, Sobral - CE

A má qualidade dos sistemas de distribuição e de reservatórios proporciona a população uma água contaminada que, serve de veículo para vários agentes infecciosos que provocam danos à saúde humana. O presente trabalho teve por objetivo analisar a qualidade e potabilidade das águas dos bebedouros de uma Universidade do município de Sobral - Ce, por meio da quantificação de coliformes totais e coliformes termotolerantes. As amostras foram avaliadas, segundo os requisitos determinados pelo Ministério da Saúde, por meio da Portaria nº 2914 de 2011. Os resultados apresentados após as análises feitas não atenderam aos parâmetros, desta forma as amostras podem ser classificadas como inadequadas para consumo de acordo com parâmetros para coliformes.

The poor quality of distribution systems and tanks to the population provides a contaminated water that serves as a vehicle for various infectious agents that cause damage to human health. This study aims to analyze the quality and potability of water in the troughs of a University of Sobral - Ce municipality, through the quantification of total coliforms and fecal coliforms. The samples were evaluated, whose requirements are determined by the Ministry of Health, through Ordinance No. 2914 of 2011. The results after the analyzes did not meet the parameters, so samples can be classified as unsuitable for consumption according to parameters coliform.