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da Silva, Livia Maria Alves Valentim,Cintra, Luciano Tavares Angelo,de Oliveira Gallinari, Marjorie,Benetti, Francine,Rahal, Vanessa,Ervolino, Edilson,de Alcantara, Sibele,Briso, Andre Luiz Fraga The Korean Academy of Conservative Dentistry 2020 Restorative Dentistry & Endodontics Vol.45 No.1
Objectives: To minimize the tooth sensitivity caused by in-office bleaching, many dentists use non-steroidal anti-inflammatory drugs and topical desensitizing gels containing potassium nitrate and sodium fluoride. This study aimed to evaluate the influence of these substances on inflammation and the expression of substance P and calcitonin gene-related peptide in pulp nerve fibers. Materials and Methods: Seventy-two rats were divided into 6 groups as follows: GI, control; GII, only dental bleaching; GIII, only ibuprofen; GIV, ibuprofen administered 30 minutes before and after the bleaching treatment and every 12 hours until the analysis; GV, only topical application of a desensitizing agent; and GVI, topical application of a desensitizing agent before dental bleaching. Placebo gel was applied to the upper left jaw and the bleaching agent was applied to the upper right jaw in all groups. Subsequently, the groups were divided into 3 subgroups based on the time of analysis: 0, 24, and 48 hours after bleaching (n = 8). The rats were euthanized and the maxillae were processed and evaluated by histopathological and immunohistochemical analyses. The data were analyzed using the Kruskal-Wallis test, followed by the Dunn test (p < 0.05). Results: In the bleaching groups, the inflammatory process and expression of neuropeptides decreased over time. The animals in which a desensitizing agent was applied showed better results within 24 hours. Conclusions: The use of a desensitizing agent had positive effects on inflammation and pain-related neuropeptide expression, minimizing the painful effects of dental bleaching treatment.
da Silva Livia Maria Alves Valentim,Cintra Luciano Tavares Angelo,Gallinari Marjorie de Oliveira,Benetti Francine,Rahal Vanessa,Ervolino Edilson,de Alcântara Sibele,Briso André Luiz Fraga 대한치과보존학회 2020 Restorative Dentistry & Endodontics Vol.45 No.2
Objectives: To minimize the tooth sensitivity caused by in-office bleaching, many dentists use non-steroidal anti-inflammatory drugs and topical desensitizing gels containing potassium nitrate and sodium fluoride. This study aimed to evaluate the influence of these substances on inflammation and the expression of substance P and calcitonin gene-related peptide in pulp nerve fibers. Materials and Methods: Seventy-two rats were divided into 6 groups as follows: GI, control; GII, only dental bleaching; GIII, only ibuprofen; GIV, ibuprofen administered 30 minutes before and after the bleaching treatment and every 12 hours until the analysis; GV, only topical application of a desensitizing agent; and GVI, topical application of a desensitizing agent before dental bleaching. Placebo gel was applied to the upper left jaw and the bleaching agent was applied to the upper right jaw in all groups. Subsequently, the groups were divided into 3 subgroups based on the time of analysis: 0, 24, and 48 hours after bleaching (n = 8). The rats were euthanized and the maxillae were processed and evaluated by histopathological and immunohistochemical analyses. The data were analyzed using the Kruskal-Wallis test, followed by the Dunn test (p < 0.05). Results: In the bleaching groups, the inflammatory process and expression of neuropeptides decreased over time. The animals in which a desensitizing agent was applied showed better results within 24 hours. Conclusions: The use of a desensitizing agent had positive effects on inflammation and pain�related neuropeptide expression, minimizing the painful effects of dental bleaching treatment.
Alexandro Cézar Faleiro,Pedro Alexandre Valentim Neto,Thaysi Ventura de Souza,Marisa Santos,Ana Carolina Maisonnave Arisi 한국작물학회 2015 Journal of crop science and biotechnology Vol.18 No.2
Plant growth-promoting rhizobacteria (PGPR) are considered to have a beneficial effect on host plants. Azospirillum brasilense is a diazotroph associated with important agricultural crops such as maize and wheat, and has been used as model organism to investigate associative plant growth promotion. In this study, we have employed scanning electronic microscopic to observe the presence of bacterium on the root surface. Two-dimensional gel electrophoresis and mass spectrometry were used to analyze the changes in protein profile of maize roots in response to A. brasilense strain FP2 7 days after inoculation and we observed 46 differently expressed protein spots. We report the identification of three of these proteins.
Water requirement and crop coefficient of sugarcane cultivated in Nicaragua
Pereira Rafael Menezes,Schwerz Felipe,Diotto Adriano Valentim,Sandoval Marlon Daniel Vargas,Aguirre Milton Javier Alvarado 한국작물학회 2024 Journal of crop science and biotechnology Vol.27 No.1
Sugarcane is one of the main agro-industrial crops in Nicaragua and Central America and one of the crops with the highest evapotranspiration rates. The lack of information related to sugarcane evapotranspiration as well as the crop coefficient (Kc) has limited productivity and water resources in Nicaragua. The knowledge of crop coefficient and water requirement for sugarcane, developed locally, will guide companies, farmers, and technicians for better irrigation management. In this context, this study aimed to determine the crop evapotranspiration and Kc for sugarcane in Nicaragua and to compare the results with those suggested by FAO. The study was performed in a field experiment at the Casur Sugarcane mill in Nicaragua, where the sugarcane was cultivated in a vertisol with a furrow irrigation method. The reference evapotranspiration was estimated using the Penman–Monteith FAO approach, and the crop evapotranspiration (ETc) was determined using the field water balance method. During the crop season, the total ETc was 1346.6 mm, resulting in a 0.90 average of Kc. The determined Kc for initial, tillering, grand growth and maturity was 0.37, 0.91, 1.11, and 0.71, respectively. The Kc proposed by FAO showed values 11.11% higher than that obtained in this study. These results highlight the importance of determining the Kc values at a local scale, parameters that guide irrigation management to use the water resources efficiently.
Biomechanical behavior of CAD/CAM cobalt-chromium and zirconia full-arch fixed prostheses
Barbin, Thais,Silva, Leticia Del Rio,Veloso, Daniele Valente,Borges, Guilherme Almeida,Presotto, Anna Gabriella Camacho,Barao, Valentim Adelino Ricardo,Groppo, Francisco Carlos,Mesquita, Marcelo Ferra The Korean Academy of Prosthodonitics 2020 The Journal of Advanced Prosthodontics Vol.12 No.6
PURPOSE. To verify the influence of computer-aided design/computer-aided manufacturing (CAD/CAM) implant-supported prostheses manufactured with cobalt-chromium (Co-Cr) and zirconia (Zr), and whether ceramic application, spark erosion, and simulation of masticatory cycles modify biomechanical parameters (marginal fit, screw-loosening torque, and strain) on the implant-supported system. MATERIALS AND METHODS. Ten full-arch fixed frameworks were manufactured by a CAD/CAM milling system with Co-Cr and Zr (n=5/group). The marginal fit between the abutment and frameworks was measured as stated by single-screw test. Screw-loosening torque evaluated screw stability, and strain analysis was explored on the implant-supported system. All analyses were performed at 3 distinct times: after framework manufacturing; after ceramic application in both materials' frameworks; and after the spark erosion in Co-Cr frameworks. Afterward, stability analysis was re-evaluated after 106 mechanical cycles (2 Hz/150-N) for both materials. Statistical analyses were performed by Kruskal-Wallis and Dunn tests (α=.05). RESULTS. No difference between the two materials was found for marginal fit, screwloosening torque, and strain after framework manufacturing (P>.05). Ceramic application did not affect the variables (P>.05). Spark erosion optimized marginal fit and strain medians for Co-Cr frameworks (P<.05). Screw-loosening torque was significantly reduced by masticatory simulation (P<.05) regardless of the framework materials. CONCLUSION. Co-Cr and Zr frameworks presented similar biomechanical behavior. Ceramic application had no effect on the biomechanical behavior of either material. Spark erosion was an effective technique to improve Co-Cr biomechanical behavior on the implant-supported system. Screw-loosening torque was reduced for both materials after masticatory simulation.