Lack of correlation between tubular dentine cement penetration, adhesiveness and leakage in roots filled with gutta percha and an endodontic cement based on epoxy amine resin

Objective: To analyze possible correlations among tubular dentine cement penetration, adhesiveness and apical leakage in fillings performed with gutta percha and an endodontic cement based on epoxy amine resin. Material and Methods: Sixty similar, extracted human mandibular central incisors were irrigated, instrumented and filled following the same protocol. First, apical leakage was quantified by fluid filtration tests. Then, these same specimens were sectioned for analysis of tubular dentine cement penetration and the middle thirds were submitted to push-out tests to analyze the adhesiveness of the fillings. Results: In brief, the means and standard deviations with a confidence interval of 95% were as follows: tubular dentine cement penetration (8.875±4.540), adhesiveness (4.441±2.683) and apical leakage (0.318±0.215). The data were confronted using the Pearson's test (P>;0.05), and it was possible to prove that there was no correlation between (1) tubular dentine cement penetration and apical leakage (r2: 0.08276), (2) tubular dentine cement penetration and adhesiveness (r2: -0.2412) and (3) adhesiveness and apical leakage (r2: 0.1340). Conclusion: After analysis of these data, it could be observed that there exists no correlation among the variables analyzed in this study

Renal function evaluation in patients with American Cutaneous Leishmaniasis after specific treatment with pentavalent antimonial

Background\ud Renal evaluation studies are rare in American Cutaneous Leishmaniasis (ACL). The aim of this study is to investigate whether specific treatment reverts ACL-associated renal dysfunction.\ud \ud Methods\ud A prospective study was conducted with 37 patients with ACL. Urinary concentrating and acidification ability was assessed before and after treatment with pentavalent antimonial.\ud \ud Results\ud The patients mean age was 35.6 ± 12 years and 19 were male. Before treatment, urinary concentrating defect (U/Posm <2.8) was identified in 27 patients (77%) and urinary acidification defect in 17 patients (46%). No significant glomerular dysfunction was observed before and after specific ACL treatment. There was no reversion of urinary concentrating defects, being observed in 77% of the patients before and in 88% after treatment (p = 0.344). Urinary acidification defect was corrected in 9 patients after treatment, reducing its prevalence from 40% before to only 16% after treament, (p = 0.012). Microalbuminuria higher than 30 mg/g was found in 35% of patients before treatment and in only 8% after treatment. Regarding fractional excretion of sodium, potassium, calcium, phosphorus and magnesium, there was no significant difference between pre and post-treatment period.\ud \ud Conclusion\ud As previously described, urinary concentrating and acidification defects were found in an important number of patients with ACL. Present results demonstrate that only some patients recover urinary acidification capacity, while no one returned to normal urinary concentration capacity.This research was supported by the Brazilian National Council for Scientific and Technological Development (CNPq). The desmopressin acetate was provided by Ferring of Brazil

Leis penais especiais comentadas

- Divulgação dos SUMÁRIOS das obras recentemente incorporadas ao acervo da Biblioteca Ministro Oscar Saraiva do STJ. Em respeito à Lei de Direitos Autorais, não disponibilizamos a obra na íntegra.- Localização na estante: 343.232(81)(094) Coment. L532pe- Coordenado por: Rogério Sanches Cunha, Ronaldo Batista Pinto e Renee do Ó Souza

Renal function evaluation in patients with American Cutaneous Leishmaniasis after specific treatment with pentavalent antimonial

Background\ud Renal evaluation studies are rare in American Cutaneous Leishmaniasis (ACL). The aim of this study is to investigate whether specific treatment reverts ACL-associated renal dysfunction.\ud \ud Methods\ud A prospective study was conducted with 37 patients with ACL. Urinary concentrating and acidification ability was assessed before and after treatment with pentavalent antimonial.\ud \ud Results\ud The patients mean age was 35.6 ± 12 years and 19 were male. Before treatment, urinary concentrating defect (U/Posm <2.8) was identified in 27 patients (77%) and urinary acidification defect in 17 patients (46%). No significant glomerular dysfunction was observed before and after specific ACL treatment. There was no reversion of urinary concentrating defects, being observed in 77% of the patients before and in 88% after treatment (p = 0.344). Urinary acidification defect was corrected in 9 patients after treatment, reducing its prevalence from 40% before to only 16% after treament, (p = 0.012). Microalbuminuria higher than 30 mg/g was found in 35% of patients before treatment and in only 8% after treatment. Regarding fractional excretion of sodium, potassium, calcium, phosphorus and magnesium, there was no significant difference between pre and post-treatment period.\ud \ud Conclusion\ud As previously described, urinary concentrating and acidification defects were found in an important number of patients with ACL. Present results demonstrate that only some patients recover urinary acidification capacity, while no one returned to normal urinary concentration capacity.This research was supported by the Brazilian National Council for Scientific and Technological Development (CNPq). The desmopressin acetate was provided by Ferring of Brazil

Modelo de redes neurais aplicado na predição da carga máxima admissível dos parafusos de um sistema de suspensão offshore

O presente trabalho tem como objetivo gerar uma base de dados com características geométricas, de material e cargas admissíveis de sistemas de suspensão offshore por meio do método de Elementos Finitos para posterior utilização em modelos de Redes Neurais. Nesse sentido, foram testadas diferentes configurações de Redes Neurais, variando seus hiperparâmetros, no intuito de atingir uma configuração ótima para a predição do comportamento mecânico estático dos parafusos de um sistema de suspensão offshore. Como conclusão é apresentado um modelo de Redes Neurais Artificiais capaz de prever com acurácia as cargas máximas admissíveis dos parafusos de um sistema de suspensão com um erro médio atrelado e um dado desvio padrão conhecidos.The present work aims to generate a database with geometric, material and admissible loads of offshore suspension systems using the Finite Element method for later use in Neural Network models. In this sense, different configurations of Neural Networks will be tested, varying their hyperparameters, in order to reach an optimal configuration for the prediction of the static mechanical behavior of the bolts of an offshore suspension system. In conclusion, a model of Artificial Neural Networks is presented capable of accurately predicting the maximum permissible loads of the bolts of a hang-off system with a known average error and standard deviation.38 p

Assessment of smear layer removal protocols in curved root canals

Made available in DSpace on 2019-09-12T16:53:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2014This study sought to assess if the final rinse protocol interferes with the smear layer removal in the apical area of curved canals. Sixty-four extracted human mandibular molars with curved mesial roots were instrumented with rotary files and divided into six experimental groups for final rinse: 1EDTA (syringe irrigation with 1mL of 17% ethylenediaminetetraacetic acid (EDTA)), 5EDTA (syringe irrigation with 5mL of 17% EDTA), 1EDTA-P (syringe irrigation with 1mL of 17% EDTA+pumping with gutta-percha point), 5EDTA-P (syringe irrigation with 5mL of 17% EDTA+pumping with gutta-percha point), 1EDTA-EA (syringe irrigation with 1mL of 17% EDTA+EndoActivator) and 5EDTA-EA (syringe irrigation with 5mL of 17% EDTA+EndoActivator). Final rinsing was carried out over 3min. The specimens were split lengthwise and observed under a scanning electron microscope using a score criterion. Comparison among the groups showed statistically significant difference only between the 5EDTA-EA group and the other groups (Kruskal-Wallis and Dunn's post-hoc tests, P<0.05). The combination of 5mL of 17% EDTA and 3mL of 2.5% sodium hypochlorite (NaOCl) with the EndoActivator removed smear layer from the apical area of curved root canals more effectively than the other protocols used.[Raldi, Denise Pontes] Universidade de Taubaté (Unitau), Dept Dent, Sao Paulo, Brazil[Cunha, Rodrigo Sanches; Mello, Isabel] Univ Manitoba, Fac Dent, Dept Restorat Dent, Winnipeg, MB R3E 0W2, Canad

Assessing apical transportation in curved canals: comparison between cross-sections and micro-computed tomography

The aim of this study was to compare two methods of assessing apical transportation in curved canals after rotary instrumentation, namely, cross-sections and micro-computed tomography (mu CT). Thirty mandibular molars were divided into two groups and prepared according to the requirements of each method. In G1 (cross-sections), teeth were embedded in resin blocks and sectioned at 2.0, 3.5, and 5.0 mm from the anatomic apex. Pre- and postoperative sections were photographed and analyzed. In G2 (mu CT), teeth were embedded in a rubber-base impression material and scanned before and after instrumentation. Mesiobuccal canals were instrumented with the Twisted File (TF) system (SybronEndo, Orange, USA), and mesiolingual canals, with the Endo Sequence (ES) system (Brasseler, Savannah, USA). Images were reconstructed, and sections corresponding to distances 2.0, 3.5, and 5.0 mm from the anatomic apex were selected for comparison. Data were analyzed using Mann-Whitney's test at a 5% significance level. The TF and ES instruments produced little deviation from the root canal center, with no statistical difference between them (P &gt; 0.05). The canal transportation results were significantly lower (0.056 mm) in G2 than in G1 (0.089 mm) (p = 0.0012). The mu CT method was superior to the cross-section method, especially in view of its ability to preserve specimens and provide results that are more closely related to clinical situations