Análise da condição periodontal de pacientes portadores de contenção ortodôntica ântero-inferior fixa

PURPOSE: This clinical study evaluated the periodontal status of patients with bonded retainers as compared to a non-treated control group. METHODS: Forty dental students were included in the sample and divided into the following two groups: 1) a test group of 20 subjects that, after orthodontic treatment, have been bonded retainer users for at least 2 years and 2) a control group of 20 patients that never experienced orthodontic treatment nor used any bonded retainer. The region associated with the retainer in the test group and the lower canine-to-canine region in the control group were examined according to the following clinical parameters: plaque index (PI), bleeding on probing (BOP), gingival recession (GR), clinical attachment level (CAL) and probing depth (PD). RESULTS: No differences were observed for GR or BOP (P&gt;0.05). In contrast, the test group showed higher values of CAL and PD at proximal sites when compared to controls (P<0.05). In addition, IP was significantly increased at buccal and lingual sites (P<0.05). CONCLUSION: The placement of orthodontic bonded retainers negatively affected periodontal health, resulting in increased PI, PD and CAL.OBJETIVO: Este estudo avaliou clinicamente a condição periodontal de pacientes portadores de contenção ortodôntica ântero-inferior fixa comparando com um grupo que nunca fez uso desse aparato ortodôntico. METODOLOGIA: Foram selecionados para o estudo 40 voluntários, estudantes de Odontologia, divididos em dois grupos. Grupo teste: 20 pacientes que fizeram uso de contenção ortodôntica fixa por mais de 2 anos; e grupo controle: 20 pacientes que nunca utilizaram qualquer tipo de contenção fixa. Os dentes ântero-inferiores envolvidos pela contenção no grupo teste, e de canino-a-canino no grupo controle, foram examinados segundo os seguintes parâmetros clínicos: Índice de placa (IP), sangramento à sondagem (SS), posição da margem gengival (PMG), nível de inserção clínica (NIC) e profundidade de sondagem (PS). RESULTADOS: Não foram observadas diferenças significantes entre os grupos para recessão gengival e sangramento à sondagem (P&gt;0,05). Já para o nível de inserção clínica e profundidade de sondagem observaram-se diferenças significantes (P<0,05) em relação às faces proximais. Além disso, um maior acúmulo de placa (IP) foi detectado nas faces livres (P<0,05). CONCLUSÃO: A contenção ortodôntica ântero-inferior fixa influenciou negativamente a condição periodontal em relação aos índices IP, NIC e PS

Crown-down preflaring in the determination of the first apical file

In this study, scanning electron microscopy (SEM) was used to evaluate the adaptation of the first apical file after preflaring in mesiobuccal (MB) and mesiolingual (ML) canals of mandibular molars considering the tactile sensibility as a reference. The mesial canals (n = 22) of human mandibular molar teeth were used, and the first instrument to bind to the working length was determined after preflaring and crown-down shaping. Digital images of the root apex were acquired and a single examiner determined the contact of the file with the walls using Image J software. The results showed that the file was in contact in 47.83% and 31.71% in the MB and ML canals, respectively. When the apexes are fused, the average was 40.03%. A descriptive analysis showed that the first apical file did not touch all dentin walls in any of the samples

RECONHECIMENTO, MENSURAÇÃO E EVIDENCIAÇÃO DO ARRENDAMENTO MERCANTIL FINANCEIRO NAS DEMONSTRAÇÕES CONTÁBEIS DO ARRENDADOR: UM ESTUDO SOBRE O NÍVEL DE CONFORMIDADE EM EMPRESAS LISTADAS NA BOVESPA / Recognition of measurement and disclosure in financial leas

  O presente trabalho teve como objetivo verificar o nível de conformidade de reconhecimento, mensuração e evidenciação das Demonstrações Contábeis do Arrendador, para efeitos de divulgação das operações de Arrendamento Mercantil, com os critérios apresentados pelo pronunciamento CPC 06, no exercício social de 2012. Para tanto, utilizou-se o Método Dedutivo, na forma de Levantamento, a partir da aplicação de um check-list estruturado, considerando-se as demonstrações contábeis das empresas do subsetor intermediários financeiros, do setor econômico-financeiro e outros, listadas na Bovespa, em 2012, de modo a constituir uma análise sobre o nível de conformidade de reconhecimento, mensuração e evidenciação com os critérios apresentados pelo pronunciamento CPC 06, por meio do uso da média aritmética aplicada ao conjunto de informações de arrendamento. Após a análise, observou-se que o processo de reconhecimento apresenta significativo nível de equidade às normas internacionais de Contabilidade. Entretanto, no que se refere aos processos de mensuração e evidenciação, as empresas estudadas demonstram-se longínquas dos parâmetros apresentados pelo CPC 06. Assim, concluiu-se que as empresas objeto da amostra, na qualidade de arrendadoras, não estão reconhecendo, mensurando e evidenciando as informações de arrendamento mercantil financeiro de forma fidedigna aos critérios estabelecidos pelo pronunciamento CPC 06. Para tanto, faz-se necessário um maior comprometimento das empresas em relação ao atendimento às normas internacionais, bem como uma preocupação dos contadores em aplicar mudanças que visem à melhoria da matéria contábil, a qual deve fomentar seus usuários com informações quanti-qualificadas, de caráter uniforme e assegurar divulgações claras, precisas e coesas.Palavras-chave: Arrendamento Mercantil Financeiro. Convergência contábil. Conformidade

Comparison between two bone substitutes for alveolar ridge preservation after tooth extraction: Cone-beam computed tomography results of a non-inferiority randomized controlled trial

AIM To test the non-inferiority of demineralized bovine bone mineral (DBBM) compared to DBBM with 10% collagen (DBBM-C) for maintenance of bone volume after tooth extraction in the anterior maxilla. MATERIALS AND METHODS Sixty-six patients were randomly treated with DBBM or DBBM-C, both of which were covered with a collagen matrix for ridge preservation in the anterior maxilla. Cone-beam computed tomographic analysis was performed immediately and 4 months after treatment. The primary outcome, for which non-inferiority of DBBM was tested, was change in the horizontal ridge width 1 mm below the buccal alveolar crest (HW-1) 4 months after extraction. RESULTS Four months after extraction, HW-1 measured -1.60 mm ± 0.82 mm for DBBM-C, while the DBBM group showed a mean loss of -1.37 mm ± 0.84 mm (p = 0.28, 0.23 [95% CI: -0.19; 0.64]). The horizontal ridge width at 3 mm (HW-3) showed -0.98 mm (±0.67 mm) for DBBM-C and -0.84 mm (±0.62 mm) for DBBM (p = 0.40, 0.12 [95% CI: -0.19; 0.45]), and the horizontal ridge width at 5 mm (HW-5) showed -0.67 mm (±0.47 mm) for DBBM-C and -0.56 mm (±0.48 mm) for DBBM (p = 0.36, 0.11 [95% CI: -0.13; 0.34]). CONCLUSIONS The present clinical trial demonstrated non-inferiority of DBBM compared to DBBM-C for maintenance of alveolar bone volume 4 months after tooth extraction in the anterior maxilla

Características morfofisiológicas da soja em Latossolo Amarelo submetida a diferentes fontes de fertilizantes fosfatados no cerrado piauiense

As fontes de fertilizantes fosfatados apresentam diferenças no produto das reações químicas entre o fertilizante e o solo, sendo influenciadas pelas características químicas e texturais do solo. Nesse sentido, objetivou-se com este estudo avaliar características morfofisiológicas da cultura da soja sob diferentes fontes de fósforo no sudoeste piauiense. O delineamento experimental foi em blocos casualizados, sendo que os tratamentos constaram de quatro fontes de fósforo (o superfosfato simples (SSP), o superfosfato triplo (SPT), fosfato natural reativo (FNR) e o fosfato natural reativo + enxofre (FNR+S)), mais uma testemunha com calcário Cincal, com quatro repetições. O experimento foi implantado no ano agrícola 2012/13 e as avaliações foram realizadas durante as safras 2013/14 e 2014/15. Foram avaliadas variáveis do estádio fenológico de florescimento pleno e de produção da soja. As características morfofisiológicas da cultura da soja foram influenciadas pelas fontes de fósforo, conforme constatado no estande de plantas, índice de área foliar, radiação fotossintética ativa e eficiência da radiação fotossintética ativa, fitomassa seca, produtividade e no peso de mil grãos

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5,6,7 vast areas of the tropics remain understudied.8,9,10,11 In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepresented in biodiversity databases.13,14,15 To worsen this situation, human-induced modifications16,17 may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost

Smoking and periodontal tissues: a review

The impact of smoking on general health has been widely studied and is directly related to several important medical problems including cancer, low birth weight, and pulmonary and cardiovascular disease. In the past 25 years, there has also been an increasing awareness of the role of cigarette consumption in oral health problems such as periodontal disease. Smoking is considered the major risk factor in the prevalence, extent and severity of periodontal diseases. This article will discuss the available evidence and provide the reader with an overview of the impact of smoking and its cessation on the pathogenesis and treatment of periodontal diseases