Papers by Carlos Tadeu Santos Dias
Revista Ciência Agronômica, 2012
Produção de milho e soja em sistema integrado sob plantio direto com diferentes combinações de pa... more Produção de milho e soja em sistema integrado sob plantio direto com diferentes combinações de pastos e categorias animais
Acta odontológica latinoamericana : AOL, 2010
The aim of this study was to evaluate the influence of eugenol-containing endodontic sealers and ... more The aim of this study was to evaluate the influence of eugenol-containing endodontic sealers and luting strategy on the pull-out bond strength of glass fiber posts to dentin. Sixty-four bovine incisors were randomly assigned into two groups of 32 specimens each for obturation procedure with gutta-percha only, or with Pulp Canal Sealer EWT Subsequently, the roots were prepared for the fiber post Reforpost and all specimens of each endodontic sealing procedure were allocated to four groups (n = 8), according to the strategies for post cementation: A) Single Bond 2 and RelyX ARC; B) All Bond 2 and C&B cement; C) All Bond 2 and RelyX ARC; D) Single Bond 2 and C&B Cement. The posts were cemented immediately after the endodontic treatment. The pull-out test was performed at a cross-head speed of 0.5 mm/min in a universal testing machine (EMIC). Data (Kgf) were submitted to a two-way ANOVA and Tukey test (p < or = 0.05). The eugenol-based sealer did not influence the pull-out bond stren...
Operative Dentistry, 2006
Clinical Relevance Applying an additional layer of solvent-free adhesive systems increased adhesi... more Clinical Relevance Applying an additional layer of solvent-free adhesive systems increased adhesive thickness and did not affect bond strength. This thicker adhesive layer may help to preserve the integrity of the restoration by acting as a stress-absorbing layer.
Journal of Prosthodontics, 2012
The aim of this study was to evaluate the Knoop microhardness and microshear bond strength (MSBS)... more The aim of this study was to evaluate the Knoop microhardness and microshear bond strength (MSBS) of dual-cured luting systems and flowable resin bonded to leucite-reinforced ceramics and enamel. Materials and Methods: Eighty bovine incisors were randomly divided into four groups per test (microhardness and microshear; n = 10) according to the bonding procedure: Excite DSC/Variolink, Clearfil SE Bond/Panavia F, Adper Scotchbond MultiPurpose Plus/RelyX ARC, and Adper Single Bond 2/Filtek Z350 Flow. For the KHN measurement, the cement was applied on the enamel surface and lightcured through a ceramic disk (5 mm diameter × 1.2 mm thick). Five indentations were performed in each specimen and measured at HMV-2. For the microshear test, two cylinders of a leucite-reinforced ceramic (1 mm diameter × 2 mm height) were bonded to the enamel substrate in accordance with the bonding procedures previously established. One cylinder was tested 24 hours after cementation, and the other was subjected to thermocycling (2000 cycles) and then submitted to an MSBS test. The data from the hardness and bond strength tests were subjected to one-and two-way repeated-measures analysis of variance (ANOVA), respectively, and to Tukey's test (α = 0.05). Results: Scotchbond/RelyX ARC presented higher values of bond strength, while Single Bond/Z350 Flow showed lower values. The thermocycling promoted a reduction in the bond strength values for all groups. Panavia F presented higher values of KHN, and the flowable resin presented the lowest. RelyX ARC and Variolink presented intermediate values on hardness evaluation. Conclusions: For ceramic cementation, dual-cured resin luting systems promoted more reliable bonding and microhardness values than the flowable resin.
Dental Materials, 2006
Objective. This study evaluated the effect of the composite photoactivation mode on microtensile ... more Objective. This study evaluated the effect of the composite photoactivation mode on microtensile bond strength and Knoop microhardness. Methods. Standard class I cavities (3!4!3 mm) were restored with two adhesives systems, Single Bond (SB) and Clearfil SE Bond (CE), and the TPH composite. The photoactivation of the composite was carried out using three modes: Conventional (CO: 400 mW/cm 2 !40 s), Soft-Start (SS: 100 mW/cm 2 !10 sC600 mW/cm 2 !30 s) and Pulse-Delay (PD: 100 mW/cm 2 !3 sC3 min waitC600 mW/cm 2 !37 s). For the microtensile test, beams obtained from the buccal wall bond interface were tested under tension at 0.5 mm/min crosshead speed until failure. For the microhardness test, the restorations were sectioned in the mesio-distal direction and indentations were made on the internal composite surface of each half at three different depths. Data of two tests were analyzed using two-way ANOVA and LSMeans (aZ0.05). Results. In the microtensile test, SS presented the highest values. PD presented intermediate values without differing significantly from the other modes. For adhesives, SB presented the highest values. In the microhardness test, PD presented the highest values, differing significantly from SS. CO presented intermediate values but without any statistical difference from the others. The SS-CE interaction presented the lowest values with statistical differences from all the others. Significance. By the SS technique, the highest bond strength was obtained. However, this technique made it possible for the adhesive system to intervene with the hardness of the composite.
Brazilian Oral Research, 2006
The aim of this study was to evaluate the diametral tensile strength (DTS) of composite resins su... more The aim of this study was to evaluate the diametral tensile strength (DTS) of composite resins submitted to different curing techniques. Four composite resins were tested in this study: Targis (Ivoclar), Solidex (Shofu), Charisma (Heraeus-Kulzer) and Filtek Z250 (3M Espe). Sixty-four cylindrical specimens were prepared and divided into eight groups according to each polymerization technique (n = 8). The indirect composite resins (Targis and Solidex) were polymerized with their respective curing systems (Targis Power and EDG-lux); Charisma and Filtek Z250 were light-cured with conventional polymerization (halogen light) and additionally, with post-curing systems. Specimens were stored in artificial saliva at 37°C for one week. DTS tests were performed in a Universal Testing Machine (0.5 mm/min). The data were statistically analyzed by ANOVA and Duncan tests. The results were (MPa): Z250/EDG-lux: 69.04ª; Z250/Targis Power: 68.57ª; Z250/conventional polymerization: 60.75b; Charisma/Tar...
General dentistry
This study utilized spectrophotometry to evaluate in vitro superficial dye deposition on resin-mo... more This study utilized spectrophotometry to evaluate in vitro superficial dye deposition on resin-modified glass ionomer, following different surface finishing and polishing treatments. Materials that were photocured adjacent to the mylar strip produced the surfaces with the lowest mean after superficial staining. A restorative technique without excesses resulted in a smoother surface and prolonged the life of the restoration. The resin-modified glass ionomers tested offer adequate clinical performance.
Operative dentistry
This study evaluated the fracture resistance of maxillary premolars with MOD Class II cavity prep... more This study evaluated the fracture resistance of maxillary premolars with MOD Class II cavity preparations restored with silver amalgam (G1), Scotchbond Multi Purpose Plus and silver amalgam (G2) and Panavia F and silver amalgam (G3). After the restorations were made, the specimens were stored at 37 degrees C for 24 hours at 100% humidity and submitted to the compression test. Statistical analysis of the data (ANOVA and Tukey Test) revealed no significant differences among the three groups that were studied.
ABSTRACT The long period for bell pepper fruit maturation makes early harvests object of interest... more ABSTRACT The long period for bell pepper fruit maturation makes early harvests object of interest for fanners. However, pepper fruits must have at least 70% of their coloration for commercialization. The exposure of fruits to ethylene gas can enhance uniform color. This work had the objective to study the ethylene action on postharvest behavior of bell peppers &#39;Prador R&#39; (yellow fruits) and &#39;Rubia R&#39; (red fruits) picked with 15% of their surface colored. The gas (120 mu L L-1) was applied each six hours during 88 hours in a chamber maintained at 22UC and 80% RH on fruits kept in shelves. The ethylene accelerated the color development and increased the soluble solids content of bell peppers &#39;Rubia R&#39;. The ascorbic acid, titratable acidity and pH of fruits were not affected due to gas application for both pepper varieties.
International Journal of Agronomy, 2011
This work applies the three mode principal components analysis to analyze simultaneously the mult... more This work applies the three mode principal components analysis to analyze simultaneously the multiple attributes; to fit of models with additive main effects and multiplicative interaction effects (AMMI models) and the regressions models on sites (SREG models); to evaluate, respectively, the multivariate response of the genotype × environment interaction and the mean response of 36 genotypes of corn tested in 4 locations in Brazil. The results were presented by joint plots to identify the best genotypes for their adaptability and performance in the set of attributes.
AIP Conference Proceedings, 2012
The present work aims to propose a systematic study and interpretation of a variable response in ... more The present work aims to propose a systematic study and interpretation of a variable response in relation to three factors, using a model of Joint Table Analysis, the Tucker3 model, as well as the joint biplot graph. The proposed method seems efficient and suitable for separating standard technical response, and the pattern of noise contained in a three inputs table, as well as allows its interpretation. The joint plot graph facilitates the study and interpretation of the data structure and provides additional information on these. In our application the aim is to identify the combinations of genotypes, locations and years that contribute or not to a high yield of bean cultivars.
Os experimentos multiambientes são um tipo especial dos experimentos bifatoriais, muito usados em... more Os experimentos multiambientes são um tipo especial dos experimentos bifatoriais, muito usados em melhoramento genético de plantas, nos quais algumas cultivares são avaliadas em diferentes locais. Geralmente nesses estudos se encontra uma resposta diferencial das cultivares em cada local que é chamada de interação genótipo x ambiente ou G x E, que é bem explicada por modelos de efeitos aditivos e interação multiplicativa (AMMI). Frequentemente os experimentos G x E podem ser desbalanceados e um ou vários genótipos não serem testados em alguns locais. Às vezes para o pesquisador recomendar os ambientes pode ser de interesse obter estimativas daquelas combinações genótipo ambiente que não foram testadas e tais estimativas podem ser calculadas explorando a informação inerente a aquelas combinações que foram atualmente obtidas. Além do interesse do pesquisador por essas estimativas, os da- dos ausentes podem causar alguma modificação na estimação tradicional dos parâmetros nos modelos A...
Estudos Econômicos (São Paulo), 2010
O objetivo deste artigo é identificar quais são as características de uma empresa que podem influ... more O objetivo deste artigo é identificar quais são as características de uma empresa que podem influenciar na dificuldade de adequação às exigências técnicas para exportação. Foi conduzido um levantamento de dados com 117 empresas exportadoras de alimentos e, como alternativa de análise dos dados, empregaram-se árvores de classificação multivariadas. Verificou-se que a característica com maior influência na dificuldade de adequação é a categoria de produto exportado, sendo as exportadoras de "Carnes e peixes frescos ou processados" as que percebem maior dificuldade. O tamanho da empresa, a adoção de normas internacionais e a experiência exportadora influenciam a dificuldade de adequação. Micro e pequenas empresas que adotam normas internacionais têm mais dificuldade para adequar seus produtos e processos às exigências técnicas que as grandes empresas. A origem do capital controlador da empresa não parece ser uma variável importante na explicação da dificuldade de adequação.
African journal of microbiology research
Our objective was to investigate crude extracts toxic (MC+) and non-toxic (MC-) effects on the gr... more Our objective was to investigate crude extracts toxic (MC+) and non-toxic (MC-) effects on the growth of Microcystis panniformis, Microcystis aeruginosa and Microcystis wesenbergii. Cultures were submitted to extracts MC+ at 5 and 10 MC µg.L -1 , and to MC-equivalent weight of these concentrations. Both crude extracts worked toward reducing the growth of M. wesenbergii and stimulating the growth of M. panniformis. Likewise, M. aeruginosa was inhibited by addition of crude MC-extract. The action of microcystins at concentrations commonly found in natural environments, plus the presence of other substances in intracellular M. aeruginosa produced differentiated effects in Microcystis spp.
American journal of dentistry, 2002
To evaluate the surface roughness of two packable composites after finishing and polishing with s... more To evaluate the surface roughness of two packable composites after finishing and polishing with six different systems. Solitaire and Alert composite samples were prepared and polished with Poli I and Poli II aluminum oxide pastes, Ultralap diamond paste, Enhance finishing points, Politip rubber polishers, fine and extra fine diamond burs, and 30-blade tungsten carbide burs according to the manufacturers' instructions. The polished surfaces were then evaluated with a profilometer and a scanning electron microscope. Solitaire composite resin presented the smoothest surfaces when polished with Poli I and II aluminum oxide pastes, Ultralap diamond paste, Politip finishing points and 30-blade tungsten carbide burs. The smoothest surfaces for Alert composite were evident with the 30-blade tungsten carbide burs.
ABSTRACT The aim of this study was to analyze the feasibility of direct seeding of liana species ... more ABSTRACT The aim of this study was to analyze the feasibility of direct seeding of liana species in the understory of a restoring forest. Seeds of the species Phanera sp., Macfadyena unguis-cati (L.) A.H. Gentry, and Peltastes peltatus (Vell.) Woodson were submitted to germination tests considering the presence and absence of light and temperature cycle variation. These species were also planted under a canopy of four tree species in a 21-year-old restored forest in Iracemápolis, São Paulo State, Brazil. Macfadyena unguis-cati was the only species presenting a positive photoblastic characteristic, while the two other tested species were not affected by light or temperature cycle. In the understory, Peltastes peltatus did not emerge. In the two other species, seed germination was not influenced by the selected tree species. These results suggest that despite the low rate of emergence, it is possible to enhance the diversity of forest by restoring it through direct seeding of some liana species.
Imputing missing values in multi-environment trials using the singular value decomposition: An em... more Imputing missing values in multi-environment trials using the singular value decomposition: An empirical comparison. Communications in Biometry and Crop Science 9 (2), 54-70.
ABSTRACT The aim of this work was the study of prediction errors associated with four imputation ... more ABSTRACT The aim of this work was the study of prediction errors associated with four imputation methods applied to solve the problem of unbalance in experiments with genotype×environment (G×E) interaction. A simulation study was carried out based on four complete matrices of real data obtained in trials of interaction G×E of pea, cotton, beans and eucalyptus, respectively. The simulation of unbalance was done with random withdrawal of 10, 20 and 40% in each matrix. The prediction errors were found using cross-validation and were tested in classic intervals of 95% for missing data. For data imputation, algorithms were considered using models of additive effects without interaction and model estimates of additive effects with multiplicative interaction based on robust submodels. In general, the best prediction errors were obtained after imputation through an additive model without interaction.
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Papers by Carlos Tadeu Santos Dias