LEANDRO PEREIRA - Academia.edu (original) (raw)
Papers by LEANDRO PEREIRA
European Journal of Dental Education
BACKGROUND Augmented Reality (AR) is a simulation of a three-dimensional environment created usin... more BACKGROUND Augmented Reality (AR) is a simulation of a three-dimensional environment created using hardware and software that provides the user with realistic experiences and ability to interact. The aim of the study was to evaluate the impact of AR simulator on the perception of learning and acute stress level in students administering local anesthesia to pediatric patients relative to standard teaching methods. MATERIAL AND METHODS The prospective study included 21 fourth- and fifth-year students enrolled in 5-year-dental program. In addition to conventional training, the students of the study group used the augmented reality simulator in a dental office 2h weekly in 2 weeks. The level of salivary cortisol was measured before and after the anesthetic procedure as one of the indicators of acute stress. RESULTS A statistically significant shorter time to perform infiltrative anesthesia technique for the anterior superior alveolar nerve was observed in students using the AR technique (28,91±9,06 seconds in the Study group and 39,80±9,29 seconds in the Control group). The level of cortisol before and after anesthesia was statistically significant in all subjects (cortisol concentration was 0,53 μg/dl before anesthesia and 2,44 μg/dl after the procedure), however, there was no statistically significant difference between the groups. CONCLUSION The AR concept may influence better manipulation and control of the syringe in students administering their first anesthetic injection to pediatric patients, but may not reduce acute stress.
The aim of this study was to compare the cardiovascular effects and the anesthetic efficacy of in... more The aim of this study was to compare the cardiovascular effects and the anesthetic efficacy of intraosseous injections of 4% articaine with 1:100,000 epinephrine (EPI100) or 4% articaine with 1:200,000 epinephrine (EPI200). Study Design. In this prospective, randomized, double-blind study, 0.9 mL EPI100 and EPI200 solutions were administered for endodontic treatment of mandibular molars with symptomatic irreversible pulpitis in 60 patients. The anesthetic success and pain during anesthesia were evaluated by visual analog scale. The cardiovascular parameters evaluated were heart rate, diastolic/systolic blood pressure, pulse oximetry, and electrocardiogram changes. Results. Both solutions provided high anesthetic efficacy (96.8% and 93.1% for EPI100 and EPI200, respectively; P Ͼ .05), and the cardiovascular parameters showed minimal incidences of significant differences throughout the clinical procedure. Conclusions. The epinephrine concentration did not affect the efficacy of 4% articaine, and both solutions produced a high success level of pulpal anesthesia. Intraosseous delivery by slow speed of injection did not induce significant clinical changes in cardiovascular parameters. (Oral Surg Oral Med Oral Pathol Oral Radiol 2012;xx:xxx)
Guaju
Atualmente, alguns dos problemas ambientais existentes e com grande impacto em Unidades de Conser... more Atualmente, alguns dos problemas ambientais existentes e com grande impacto em Unidades de Conservação Ambiental (UC) são as rodovias e o tráfego intenso nelas. A rodovia que delimita a borda de uma área de proteção gera diferentes efeitos de bordas a partir de fatores diversos. A borda originada da poluição resultante da combustão dos veículos, por exemplo, é diferente da borda formada pela interferência sonora desses mesmos veículos que trafegam pela rodovia. Para solucionar essa problemática, a bioacústica, apesar de ser uma área de estudo recente, vem buscando soluções a partir de duas perspectivas distintas: estudo do próprio ambiente e análise da comunicação de determinadas espécies. Este trabalho, seguindo a primeira linha de pesquisa mencionada, tem por objetivo analisar a absorção acústica de uma UC de Mata Atlântica que sofre com interferência elevada da rodovia PR-407: a Floresta Estadual do Palmito (FEP). Para tanto, a metodologia do trabalho contou com três principais e...
Journal of Open Innovation: Technology, Market, and Complexity
During the economic and financial crisis, private and public organizations were subject to a cons... more During the economic and financial crisis, private and public organizations were subject to a constant reduction in costs and resources. Public shared service models felt compelled to adopt the Lean methodology with the aim of reducing costs, reducing waste and increasing employee satisfaction with the provision of quality services. Against this background, this article aims to evaluate the impact of the implementation of Shared Services and the inherent benefits of lean management in the Military Store, Contact Center, Post Office and Internal Portal used by the Portuguese Air Force. Using a case study methodology, this study portrays the elimination of waste and the optimization of existing human and financial resources. After the implementation in 2015, it is still possible now to verify that there is some resistance to change, and the fact that we are dealing with a hierarchical organization justifies this disadvantage. The implementation and operation of all services in their en...
International Journal of Learning and Change
Revista Caatinga
Intercropping of Urochloa species with corn is an alternative to enable the no-tillage system, be... more Intercropping of Urochloa species with corn is an alternative to enable the no-tillage system, besides influencing weed community. Therefore, the investigation of underdoses of the herbicide glyphosate to manage grasses in intercropping systems, avoid grain yield losses, and make feasible intercropping in agricultural areas is important. This study aimed to evaluate glyphosate underdoses in the suppression of Urochloa brizantha cv. Marandu and Urochloa ruziziensis and weed control. Two tests were conducted under field conditions in a randomized block design with four replications and eight treatments consisting of increasing glyphosate doses (0, 54, 108, 270, 378, 540, 756, and 1.080 g a.e. ha−1). All treatments received a dose of 1.200 g a.i. ha−1 of atrazine. Evaluations of phytointoxication of brachiaria plants were carried out at 7, 14, 21, and 28 days after application. Moreover, total dry matter, leaf dry matter, stem dry matter, leaf to stem ratio, and canopy height of brachi...
Revista Ceres
Talinum triangulare (Jacq.) Willd, known as Ceylon spinach, Surinam purslane, or waterleaf, is cu... more Talinum triangulare (Jacq.) Willd, known as Ceylon spinach, Surinam purslane, or waterleaf, is cultivated for medicinal and food purposes. Among environmental factors, light is an important regulator of primary production, contributing to plant growth. However, the success of each plant species depends on its morphoanatomical responses to light. The aim of this study was to determine whether T. triangulare leaf micromorphometry is affected when grown in full sun and under shade, and if so, which plant biometric variables are affected. T. triangulare cultivation was tested in beds arranged in blocks under shade levels of 0, 18, 30, and 50%. Each bed was considered a basic experimental unit, totaling four replications per treatment. Plant height, stem diameter, leaf area, leaf fresh weight, stem fresh weight, specific leaf area, leaf area ratio, abaxial epidermis, and mesophyll thickness were higher as shade levels increased. However, there was a decrease in the number of leaves, root...
Clinical Oral Implants Research
International Journal of Business Innovation and Research
Revista Brasileira de Agropecuária Sustentável
O estudo da área foliar das plantas permite inferir sobre os parâmetros de crescimento e de desen... more O estudo da área foliar das plantas permite inferir sobre os parâmetros de crescimento e de desenvolvimento vegetal, tornando-a um importante indicativo da produtividade agrícola. Objetivou-se, determinar uma equação que permita estimar a área foliar de Talinum triangulare e T. paniculatum por intermédio das medidas lineares das folhas. Amostrou-se aleatoriamente duzentos limbos foliares de cada espécie e com auxílio de escalímetro digital determinou as dimensões foliares de comprimento (C), largura (L) e o seu produto (CL), de modo não destrutivo. Utilizando as mesmas folhas, obteve-se área foliar real (AFR) por meio do software ImageJ®. Foram testados modelos lineares, geométricos e exponenciais e a equação selecionada foi a que apresentou menor valor de soma dos quadrados dos resíduos e maiores coeficientes de determinação (R2). Os resultados obtidos neste estudo demonstram que para as duas espécies, equações de regressão lineares simples, utilizando o produto do comprimento pela...
Applied Thermal Engineering
Blucher Design Proceedings
Ambientes corporativos compreendem uma grande diversidade de atividades, com suas especificidades... more Ambientes corporativos compreendem uma grande diversidade de atividades, com suas especificidades. A partir das etapas do método de Bonsiepe (1984), além de ferramentas de outros métodos, o presente artigo, trata da descrição de um conjunto de pesquisas e análises que resultaram em um quadro de requisitos e parâmetros. A estrutura tem por finalidade adequar um ambiente corporativo às demandas apresentadas pelos usuários, e agregá-las aos princípios sustentáveis. Com os resultados especificados, foi possível compreender, estruturar e aplicar, medidas e condições de melhorias alinhadas às necessidades identificadas para o ambiente administrativo da Universidade Federal da Paraíba. O projeto priorizou a redução de materiais que provoquem impactos ambientais.
International Journal of Learning and Change
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
Soft-shell crab is considered a gastronomic delicacy, reaching high values in the international m... more Soft-shell crab is considered a gastronomic delicacy, reaching high values in the international market. The process of hardening of the crab's exoskeleton after moulting takes approximately two days to complete; however, the duration for which the shell remains at the consistency of high commercial value is only 3 hours on average. After this period, the shell assumes a consistency classified as “paper”, later becoming “hard” again. The goal of this work was to evaluate the use of the crabs themselves to alter the chemical characteristics of the water and thereby increase the amount of time during which they can be marketed as “soft-shell crab”. In this work, 241 individuals of Callinectes ornatus were used in two experiments. In the first experiment, the animals were maintained in a collective system with filtration and partial daily water renewal. In the second experiment, the crabs were maintained in a collective system with filtration but no water renewal. In Experiment 1, t...
European Journal of Dental Education
BACKGROUND Augmented Reality (AR) is a simulation of a three-dimensional environment created usin... more BACKGROUND Augmented Reality (AR) is a simulation of a three-dimensional environment created using hardware and software that provides the user with realistic experiences and ability to interact. The aim of the study was to evaluate the impact of AR simulator on the perception of learning and acute stress level in students administering local anesthesia to pediatric patients relative to standard teaching methods. MATERIAL AND METHODS The prospective study included 21 fourth- and fifth-year students enrolled in 5-year-dental program. In addition to conventional training, the students of the study group used the augmented reality simulator in a dental office 2h weekly in 2 weeks. The level of salivary cortisol was measured before and after the anesthetic procedure as one of the indicators of acute stress. RESULTS A statistically significant shorter time to perform infiltrative anesthesia technique for the anterior superior alveolar nerve was observed in students using the AR technique (28,91±9,06 seconds in the Study group and 39,80±9,29 seconds in the Control group). The level of cortisol before and after anesthesia was statistically significant in all subjects (cortisol concentration was 0,53 μg/dl before anesthesia and 2,44 μg/dl after the procedure), however, there was no statistically significant difference between the groups. CONCLUSION The AR concept may influence better manipulation and control of the syringe in students administering their first anesthetic injection to pediatric patients, but may not reduce acute stress.
The aim of this study was to compare the cardiovascular effects and the anesthetic efficacy of in... more The aim of this study was to compare the cardiovascular effects and the anesthetic efficacy of intraosseous injections of 4% articaine with 1:100,000 epinephrine (EPI100) or 4% articaine with 1:200,000 epinephrine (EPI200). Study Design. In this prospective, randomized, double-blind study, 0.9 mL EPI100 and EPI200 solutions were administered for endodontic treatment of mandibular molars with symptomatic irreversible pulpitis in 60 patients. The anesthetic success and pain during anesthesia were evaluated by visual analog scale. The cardiovascular parameters evaluated were heart rate, diastolic/systolic blood pressure, pulse oximetry, and electrocardiogram changes. Results. Both solutions provided high anesthetic efficacy (96.8% and 93.1% for EPI100 and EPI200, respectively; P Ͼ .05), and the cardiovascular parameters showed minimal incidences of significant differences throughout the clinical procedure. Conclusions. The epinephrine concentration did not affect the efficacy of 4% articaine, and both solutions produced a high success level of pulpal anesthesia. Intraosseous delivery by slow speed of injection did not induce significant clinical changes in cardiovascular parameters. (Oral Surg Oral Med Oral Pathol Oral Radiol 2012;xx:xxx)
Guaju
Atualmente, alguns dos problemas ambientais existentes e com grande impacto em Unidades de Conser... more Atualmente, alguns dos problemas ambientais existentes e com grande impacto em Unidades de Conservação Ambiental (UC) são as rodovias e o tráfego intenso nelas. A rodovia que delimita a borda de uma área de proteção gera diferentes efeitos de bordas a partir de fatores diversos. A borda originada da poluição resultante da combustão dos veículos, por exemplo, é diferente da borda formada pela interferência sonora desses mesmos veículos que trafegam pela rodovia. Para solucionar essa problemática, a bioacústica, apesar de ser uma área de estudo recente, vem buscando soluções a partir de duas perspectivas distintas: estudo do próprio ambiente e análise da comunicação de determinadas espécies. Este trabalho, seguindo a primeira linha de pesquisa mencionada, tem por objetivo analisar a absorção acústica de uma UC de Mata Atlântica que sofre com interferência elevada da rodovia PR-407: a Floresta Estadual do Palmito (FEP). Para tanto, a metodologia do trabalho contou com três principais e...
Journal of Open Innovation: Technology, Market, and Complexity
During the economic and financial crisis, private and public organizations were subject to a cons... more During the economic and financial crisis, private and public organizations were subject to a constant reduction in costs and resources. Public shared service models felt compelled to adopt the Lean methodology with the aim of reducing costs, reducing waste and increasing employee satisfaction with the provision of quality services. Against this background, this article aims to evaluate the impact of the implementation of Shared Services and the inherent benefits of lean management in the Military Store, Contact Center, Post Office and Internal Portal used by the Portuguese Air Force. Using a case study methodology, this study portrays the elimination of waste and the optimization of existing human and financial resources. After the implementation in 2015, it is still possible now to verify that there is some resistance to change, and the fact that we are dealing with a hierarchical organization justifies this disadvantage. The implementation and operation of all services in their en...
International Journal of Learning and Change
Revista Caatinga
Intercropping of Urochloa species with corn is an alternative to enable the no-tillage system, be... more Intercropping of Urochloa species with corn is an alternative to enable the no-tillage system, besides influencing weed community. Therefore, the investigation of underdoses of the herbicide glyphosate to manage grasses in intercropping systems, avoid grain yield losses, and make feasible intercropping in agricultural areas is important. This study aimed to evaluate glyphosate underdoses in the suppression of Urochloa brizantha cv. Marandu and Urochloa ruziziensis and weed control. Two tests were conducted under field conditions in a randomized block design with four replications and eight treatments consisting of increasing glyphosate doses (0, 54, 108, 270, 378, 540, 756, and 1.080 g a.e. ha−1). All treatments received a dose of 1.200 g a.i. ha−1 of atrazine. Evaluations of phytointoxication of brachiaria plants were carried out at 7, 14, 21, and 28 days after application. Moreover, total dry matter, leaf dry matter, stem dry matter, leaf to stem ratio, and canopy height of brachi...
Revista Ceres
Talinum triangulare (Jacq.) Willd, known as Ceylon spinach, Surinam purslane, or waterleaf, is cu... more Talinum triangulare (Jacq.) Willd, known as Ceylon spinach, Surinam purslane, or waterleaf, is cultivated for medicinal and food purposes. Among environmental factors, light is an important regulator of primary production, contributing to plant growth. However, the success of each plant species depends on its morphoanatomical responses to light. The aim of this study was to determine whether T. triangulare leaf micromorphometry is affected when grown in full sun and under shade, and if so, which plant biometric variables are affected. T. triangulare cultivation was tested in beds arranged in blocks under shade levels of 0, 18, 30, and 50%. Each bed was considered a basic experimental unit, totaling four replications per treatment. Plant height, stem diameter, leaf area, leaf fresh weight, stem fresh weight, specific leaf area, leaf area ratio, abaxial epidermis, and mesophyll thickness were higher as shade levels increased. However, there was a decrease in the number of leaves, root...
Clinical Oral Implants Research
International Journal of Business Innovation and Research
Revista Brasileira de Agropecuária Sustentável
O estudo da área foliar das plantas permite inferir sobre os parâmetros de crescimento e de desen... more O estudo da área foliar das plantas permite inferir sobre os parâmetros de crescimento e de desenvolvimento vegetal, tornando-a um importante indicativo da produtividade agrícola. Objetivou-se, determinar uma equação que permita estimar a área foliar de Talinum triangulare e T. paniculatum por intermédio das medidas lineares das folhas. Amostrou-se aleatoriamente duzentos limbos foliares de cada espécie e com auxílio de escalímetro digital determinou as dimensões foliares de comprimento (C), largura (L) e o seu produto (CL), de modo não destrutivo. Utilizando as mesmas folhas, obteve-se área foliar real (AFR) por meio do software ImageJ®. Foram testados modelos lineares, geométricos e exponenciais e a equação selecionada foi a que apresentou menor valor de soma dos quadrados dos resíduos e maiores coeficientes de determinação (R2). Os resultados obtidos neste estudo demonstram que para as duas espécies, equações de regressão lineares simples, utilizando o produto do comprimento pela...
Applied Thermal Engineering
Blucher Design Proceedings
Ambientes corporativos compreendem uma grande diversidade de atividades, com suas especificidades... more Ambientes corporativos compreendem uma grande diversidade de atividades, com suas especificidades. A partir das etapas do método de Bonsiepe (1984), além de ferramentas de outros métodos, o presente artigo, trata da descrição de um conjunto de pesquisas e análises que resultaram em um quadro de requisitos e parâmetros. A estrutura tem por finalidade adequar um ambiente corporativo às demandas apresentadas pelos usuários, e agregá-las aos princípios sustentáveis. Com os resultados especificados, foi possível compreender, estruturar e aplicar, medidas e condições de melhorias alinhadas às necessidades identificadas para o ambiente administrativo da Universidade Federal da Paraíba. O projeto priorizou a redução de materiais que provoquem impactos ambientais.
International Journal of Learning and Change
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
XXXII Congresso Brasileiro de Neurocirurgia
Soft-shell crab is considered a gastronomic delicacy, reaching high values in the international m... more Soft-shell crab is considered a gastronomic delicacy, reaching high values in the international market. The process of hardening of the crab's exoskeleton after moulting takes approximately two days to complete; however, the duration for which the shell remains at the consistency of high commercial value is only 3 hours on average. After this period, the shell assumes a consistency classified as “paper”, later becoming “hard” again. The goal of this work was to evaluate the use of the crabs themselves to alter the chemical characteristics of the water and thereby increase the amount of time during which they can be marketed as “soft-shell crab”. In this work, 241 individuals of Callinectes ornatus were used in two experiments. In the first experiment, the animals were maintained in a collective system with filtration and partial daily water renewal. In the second experiment, the crabs were maintained in a collective system with filtration but no water renewal. In Experiment 1, t...