Efeito De Técnicas De Polimento Na Estabilidade Da Cor E Rugosidade Superficial De Resinas Compostas Microhibridas

Resin roughness and staining is a common problem in dentistry. Objective: the aim of this study was to verify the influence of single and multiple-steps polishing techniques on color stability and surface roughness of differents composite resins. Groups were (n=10): FS+CS. Filtek Supreme XT + clear strip; FS+PG. Filtek Supreme XT+PoGo; FS+SF. Filtek Supreme XT+Sof-Lex; AM+CS. Amelogen+clear strip; AM+PG. Amelogen+PoGo; AM+SF. Amelogen+Sof-Lex; TEC+CL. TetricEvoCeram + clear strip; TEC+PG. Tetric EvoCeram+PoGo; TEC+SF. Tetric EvoCeram+Sof-Lex; CED+CS. Ceram X Duo+clear strip; CED+PG. Ceram X Duo+PoGo; CED+SF. Ceram X Duo+ Sof-Lex. The initial color and roughness were determined before and after the polishing procedures. All specimens were stored for 7 days in coffee solution and the color assessment was performed. Two specimens from each group were evaluated by scanning electron microscopy. Roughness and color data were submitted to ANOVA and Tukey tests(pG7(5.8f)=G10(5.7ef)>G1(3.7c), followed by the G6(5.9f)>G9(3.1bc)=G12(2.1ab)>G3(1.7a). G3, after 7 days, presented the lowest values for Delta E(1.704). The lowest roughness values were observed when the clear strips were used regardless material type. The Sof-Lex system provided the lowest surface roughness values for all tested composite resins. Among composite resins the highest roughness values were found for Amelogen (G5-0.49 and G6-0.35), regardless polishing technique. All tested materials presented changes in color after immersion in coffee solution. The roughness surface and the staining of composite resins are material and polishing technique dependents.32126227

Effect of the Polishing Procedures on Color Stability and Surface Roughness of Composite Resins

Objectives. To evaluate the polishing procedures effect on color stability and surface roughness of composite resins. Methods. Specimens were distributed into 6 groups: G1: Filtek Supreme XT + PoGo; G2: Filtek Supreme XT + Sof-Lex; G3: Filtek Supreme XT + no polishing; G4: Amelogen + PoGo; G5: Amelogen + Sof-Lex.; G6: Amelogen + no polishing. Initial color values were evaluated using the CIELab scale. After polishing, surface roughness was evaluated and the specimens were stored in coffee solution at 37°C for 7 days. The final color measurement and roughness were determined. Results. Sof-Lex resulted in lower staining. Amelogen showed the highest roughness values than Filtek Supreme on baseline and final evaluations regardless of the polishing technique. Filtek Supreme polished with PoGo showed the lowest roughness values. All groups presented discoloration after storage in coffee solution, regardless of the polishing technique. Conclusion. Multiple-step polishing technique provided lower degree of discoloration for both composite resins. The final surface texture is material and technique dependent

Effect of deproteinization and tubular occlusion on microtensile bond strength and marginal microleakage of resin composite restorations

Dentin adhesion procedure presents limitations, especially regarding to lifetime stability of formed hybrid layer. Alternative procedures have been studied in order to improve adhesion to dentin. OBJECTIVE: The aim of this study was to evaluate in vitro the influence of deproteinization or dentin tubular occlusion, as well as the combination of both techniques, on microtensile bond strength (µTBS) and marginal microleakage of composite resin restorations. MATERIAL AND METHODS: Extracted erupted human third molars were randomly divided into 4 groups. Dentin surfaces were treated with one of the following procedures: (A) 35% phosphoric acid gel (PA) + adhesive system (AS); (B) PA + 10% NaOCl + AS; (C) PA + oxalate + AS and (D) PA + oxalate + 10% NaOCl + AS. Bond strength data were analyzed statistically by two-way ANOVA and Tukey's test. The microleakage scores were analyzed using Kruskal-Wallis and Mann-Whitney non-parametric tests. Significance level was set at 0.05 for all analyses. RESULTS: µTBS data presented statistically lower values for groups D and B, ranking data as A>C>B>D. The use of oxalic acid resulted in microleakage reduction along the tooth/restoration interface, being significant when used alone. On the other hand, the use of 10% NaOCl alone or in combination with oxalic acid, resulted in increased microleakage. CONCLUSIONS: Dentin deproteinization with 10% NaOCl or in combination with oxalate significantly compromised both the adhesive bond strength and the microleakage at interface. Tubular occlusion prior to adhesive system application seems to be a useful technique to reduce marginal microleakage

Clinical strategies for esthetic excellence in anterior tooth restorations: understanding color and composite resin selection

Direct composite resin restorations have become a viable alternative for patients that require anterior restorative procedures to be integrated to the other teeth that compose the smile, especially for presenting satisfactory esthetic results and minimum wear of the dental structure. Technological evolution along with a better understanding of the behavior of dental tissues to light incidence has allowed the development of new composite resins with better mechanical and optical properties, making possible a more artistic approach for anterior restorations. The combination of the increasing demand of patients for esthetics and the capacity to preserve the dental structure resulted in the development of different incremental techniques for restoring fractured anterior teeth in a natural way. In order to achieve esthetic excellence, dentists should understand and apply artistic and scientific principles when choosing color of restorative materials, as well as during the insertion of the composite resin. The discussion of these strategies will be divided into two papers. In this paper, the criteria for color and material selection to obtain a natural reproduction of the lost dental structures and an imperceptible restoration will be addressed

Aspectos morfológicos da punção aspirativa de mama

A punção aspirativa por agulha fina (PAAF) de mama tem sido amplamente utilizada pela facilidade da técnica que, além de não dispendiosa, fornece resultados rápidos com boa acuidade diagnóstica. A análise de nosso material de punção aspirativa de mama permitiu a caracterização de alguns aspectos morfológicos importantes para o diagnóstico das lesões mais freqüentes

Combination of an analgesic and anti-inflammatory to avoid bleaching-induced tooth sensitivity: a randomized, triple-blind clinical trial / Combinação de um analgésico e antiinflamatório para evitar a sensibilidade dental induzida pelo clareamento: um ensaio clínico randomizado triplo-cego

induced tooth sensitivity (TS). This trial assed if the combination of an analgesic and an anti-inflammatory could reduce bleaching-induced TS. A parallel, placebo-controlled, triple-blind, randomized trial was conducted on 115 healthy adults. The patients received the association of acetaminophen 750 mg/ ketorolac tromethamine 10 mg or placebo, 1 h before the in-office bleaching (35% hydrogen peroxide), and extra doses every 8 h for 48 h. The TS was recorded on VAS 0-10 and NRS 0-4 scales, during bleaching and 1 to 48 h post-bleaching. The color was measured before and one month after dental bleaching using two visual shade guides and spectrophotometer. An intent-to-treat analysis was used to analyze data from all patients who were randomly assigned. No significant difference (p=0.41) in the absolute risk of TS between the acetaminophen/ketorolac group (72%; 95% CI 60 to 82) and placebo (79%; 95% CI 68 to 89) with a relative risk of 0.92; 95% CI 0.7 to 1.1. The mean difference in intensity of TS for VAS was lower in the acetaminophen/ketorolac group in the periods 12 to 24 h (-0.7) and 24 to 48 h (-0.4). A whitening effect was observed in both groups with no statistically significant difference (p>0.05). The administration of the association ketorolac/acetaminophen prior to in-office bleaching did not reduce the risk of TS but reduced the intensity of TS after 12 h in a very small magnitude. clinicaltrial.gov NCT03343392.

Refletindo a extensão e suas práticas - PETGEOUDESC - educação e pesquisa

Este artigo objetiva a reflexão e o esclarecimento sobre o que é e como tem sido realizada a extensão universitária. Para cumprir tal objetivo buscamos entender primeiro o que diz a Constituição Brasileira a respeito e como teve inicio a prática extensionista no Brasil. Em seguida abordamos as formar tradicionais de se fazer extensão universitária. Depois, de posse de alguns conceitos e com algumas reflexões já realizadas abordamos formas de extensão que consideramos de sucesso. Por últimos analisamos as atividades de extensão realizadas pelso grupos PET

Burden of disease attributable to risk factors in European countries: a scoping literature review

Objectives: Within the framework of the burden of disease (BoD) approach, disease, and injury burden estimates attributable to risk factors are a useful guide for policy formulation and priority setting in disease prevention. Considering the important differences in methods, and their impact on burden estimates, we conducted a scoping literature review to: (1) map the BoD assessments including risk factors performed across Europe, and (2) identify the methodological choices in comparative risk assessment (CRA) and risk assessment methods. Methods: We searched multiple literature databases, including grey literature websites, and targeted public health agencies' websites. Results: A total of 113 studies were included in the synthesis and further divided into independent BoD assessments (54 studies) and studies linked to the Global Burden of Disease (59 papers). Our results showed that the methods used to perform CRA varied substantially across independent European BoD studies. While there were some methodological choices that were more common than others, we did not observe patterns in terms of country, year, or risk factor. Each methodological choice can affect the comparability of estimates between and within countries and/or risk factors since they might significantly influence the quantification of the attributable burden. From our analysis, we observed that the use of CRA was less common for some types of risk factors and outcomes. These included environmental and occupational risk factors, which are more likely to use bottom-up approaches for health outcomes where disease envelopes may not be available. Conclusions: Our review also highlighted misreporting, the lack of uncertainty analysis, and the under-investigation of causal relationships in BoD studies. Development and use of guidelines for performing and reporting BoD studies will help understand differences, and avoid misinterpretations thus improving comparability among estimates.info:eu-repo/semantics/publishedVersio

Changes in surface characteristics of restorative composites subjected to different techniques for finishing and polishing

Orientador: Regina M. Puppin RontaniTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: Inúmeras alterações foram feitas na fabricação das resinas compostas fotoativáveis, especialmente na tentativa de obter melhor estabilidade de cor, adequada resistência ao desgaste e lisura de superfície clinicamente aceitável. Neste contexto, fabricantes têm, promovido alterações no tamanho das partículas de carga e incorporado a maior quantidade de componentes inorgânicos no interior da matriz resinosa. Além da composição do material, os procedimentos de acabamento e polimento podem também influenciar na qualidade superficial da resina composta, relacionando-se diretamente com rugosidade. Superfícies rugosas predispõem a restauração a maior retenção de biofilme bacteriano, facilitando o desenvolvimento de lesões cariosas, manchamentos além de interferir no seu brilho e estética finais. Neste contexto, esta tese propôs a avaliar qualitativamente a topografia de superfície de resinas compostas microhíbridas e nanoparticuladas, em função de diferentes combinações entre técnicas de polimento e resinas compostas. Com objetivo didático, esta tese foi dividida em 3 partes, como descrito a seguir. Parte 1: avaliar a influência que diferentes técnicas de acabamento e polimento exercem sobre a rugosidade da superfície de uma resina composta nanoparticulada. Parte 2: comparar a estabilidade de cor e a característica de superfície promovida por técnicas de acabamento e polimento que empregam um ou múltiplos passos sobre resinas microhíbridas e nanoparticuladas, correlacionando com a geometria e composição das partículas inorgânicas das resinas compostas. Parte 3: aferir de forma quantitativa e qualitativa, por meio da rugosidade superficial e microscopia eletrônica de varredura, respectivamente, o efeito de técnicas de acabamento e polimento de resinas compostas nanoparticuladas, nanohíbridas e microhíbridas. Há uma relação direta entre os sistemas de acabamento e polimento e a qualidade superficial das resinas. Sistemas de múltiplos passos tendem a ser melhores em comparação aos de passo único, qualquer que seja o tipo de resina composta empregada. Já a forma e o tamanho das partículas de carga exercem influência sobre a lisura e manchamento, sendo que resinas composta nanoparticuladas apresentam melhor lisura e estabilidade de cor em relação às micro-híbridas. A lisura e o manchamento são materiais e polimento dependentes.Abstract: Several changes were made in the light-cured composites resins manufacture, especially trying to obtain better color stability, adequate wear resistance and clinically acceptable surface smoothness. About this, manufacturers have predominantly reduced the diameter of charged particles, promoting changes in its geometry and also incorporating a bigger amount of inorganic components within the resin matrix. Besides the material composition, the procedures of finishing and polishing may influence in the composite resin surface quality, relating directly with roughness. Rough surfaces predispose to the restoration a greater retention of bacterial biofilms, facilitating the development of secondary caries, discoloration and staining as well as interfering in their brilliance and aesthetic. In this context, this thesis intends to qualitatively evaluate the surface topography of microhybrid and nanoparticle composite resins, in different combinations for polishing techniques of resin composites. With instructional purposes, this thesis was divided into 3 parts, as described below. Part 1: assessing the influence that different finishing and polishing techniques have on the surface roughness of a nanoparticle composite resin. Part 2: compare the color stability and the surface feature promoted by finishing and polishing techniques of single or multiple steps in nanoparticulate and microhybrid resins, correlating with composite resins geometry and inorganic particles composition. Part 3: assess in a quantitatively and qualitatively way, through surface roughness and electron microscopy scanning, respectively, the effect of different finishing and polishing techniques of hybrid and microhybrid composite resins. There is a direct relationship between finishing and polishing systems and resins surface quality. Systems of multiple steps tend to be better when compared to single step systems, regardless to the type of the resin used. The shape and diameter of charged particles influence on the smoothness and staining, nanoparticulate resins present better surface smoothness and color stability in relation to micro-hybrid resins. Smoothness and staining are materials and polishing dependents.DoutoradoMateriais DentariosDoutor em Materiais Dentário