RESUMO Objetivos: Avaliar a resistência de união dos reparos com resina composta auto-adesiva Vertise Flow (Kerr) e uma resina composta convencional Filtek Z350 (3M ESPE) submetida à diferentes tratamentos de superfície. Métodos: Quarenta amostras foram divididas em quatro grupos: ZV (Filtek Z350 + Vertise Flow, sem tratamento prévio); ZAV (Z350 + Vertise Flow com tratamento prévio com Sistema Adesivo Universal Single Bond (3M ESPE)); ZAZ (Filtek Z350 + Filtek Z350 com tratamento prévio com Sistema Adesivo Universal Single Bond (3M ESPE)); VV (Vertise Flow + Vertise Flow, sem tratamento prévio). Após 15 dias de armazenamento, as amostras foram submetidas ao teste de microtração (Kratos IKCL3-USB, SP, Brasil), com velocidade de 0,5 mm / min e carga de 20kg.Para análise estatística, foram utilizados os testes ANOVA com Tukey (p <5%). Resultados: Os valores médios da resistência de união foram maiores, respectivamente, nos grupos: ZV (36,07 ± 37,63); ZAZ (24,04 ± 28,51); VV (19,39 ± 28,24) e ZAV (16,06 ± 15,66). A resistência de união dos reparos entre os grupos apresentou resultados satisfatórios. Conclusão: A resina composta auto-adesiva Vertise Flow parece ser uma alternativa viável e rápida para reparos em restaurações com resinas compostas.

ABSTRACT Objective: To evaluate the bond strength of repairs with the self-adhering flowable composite Vertise Flow (Kerr) and a conventional composite resin Filtek Z350 (3M ESPE) subjected to different surface treatments. Methods: Forty specimens were divided into four groups: ZV (Filtek Z350 + Vertise Flow, without prior treatment); ZAV (Z350 + Vertise Flow with prior treatment with Single Bond Universal Adhesive System (3M ESPE)); ZAZ (Filtek Z350 + Filtek Z350 with prior treatment with Single Bond Universal Adhesive System (3M ESPE)); VV (Vertise Flow + Vertise Flow, without prior treatment). After 15 days of storage, the specimens were subjected to microtensile tests (Kratos IKCL3-USB, SP, Brazil), with speed of 0.5 mm/min and 20kg load. For statistical analysis, ANOVA with Tukey tests were used (p < 5%). Results: The mean values of the bond strength were highest respectively in the groups: ZV (36.07 ± 37.63); ZAZ (24.04 ± 28.51); VV (19.39 ± 28.24) and ZAV (16.06 ± 15.66). The bond strength of the repairs between the groups presented satisfactory results. Conclusion: The self-adhesive composite resin Vertise Flow seems to be a viable and fast alternative for composite resins repairs.

Abstract The aim of this study was to evaluate the degree of conversion (DC) and the thermal stability of bulk-fill and conventional composite resins. Eleven composite resin samples were prepared to evaluate the DC, Vickers microhardness (VMH), mass and residue/particle loss, glass transition temperature (Tg), enthalpy, and linear coefficient of thermal expansion (CTE) using infrared spectroscopy (FTIR), microdurometer analyses, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dilatometry (DIL). The data were subjected to statistical analysis, with a significance level of 95%. DC and VMH were not influenced by the polymerized side of the sample, and statistical differences were recorded only among the materials. Decomposition temperature, melting, and mass and residue loss were dependent on the material and on the evaluation condition (polymerized and non-polymerized). Tg values were similar between the composites, without statistically significant difference, and CTE ranged from 10.5 to 37.1 (10-6/°C), with no statistical difference between the materials. There was a moderate negative correlation between CTE and the % of load particles, by weight. Most resins had a DC above that which is reported in the literature. TGA, Tg, and CTE analyses showed the thermal behavior of the evaluated composites, providing data for future research, assisting with the choice of material for direct or semidirect restorations, and helping choose the appropriate temperature for increasing the DC of such materials.

Abstract The aim of this study was to evaluate the cytotoxic effect, degree of conversion (% DC), Vickers hardness (VH), and surface morphology of composite resins. Eleven resins, nine bulk-fill resins, and two conventional resins were evaluated. Each material was sampled to evaluate DC (using FTIR), VH, cytotoxicity (using MTT and Neutral Red - NR test), surface morphology (using SEM and AFM), and organic filler (using EDS). All statistical tests were performed with SPSS and the level of significance was set at 0.05. MTT revealed that the materials presented low or no cytotoxic potential in relation to the control. Opus was the resin with the lowest cell viability at a 1:2 concentration at 72 h (32%) and at 7 days (43%), but that significantly increased when the NR test was applied at a 1:2 concentration after 7 days. Thickness and surface subjected to polymerization had no influence on DC, and differences were observed only between the materials. In the microhardness test, statistical differences were observed between the evaluated thicknesses. The bulk-fill resins analyzed in this study exhibited low and/or no cytotoxicity to L929 cells, except for Opus, which showed moderate cytotoxicity according to the MTT assay. When the NR test was used, results were not satisfactory for all composites, indicating the need for different methodologies to evaluate the properties of these materials. The assessed resins demonstrated acceptable physicomechanical properties.

Resumo Introdução Apesar dos avanços e inovações na odontologia restauradora, a microinfiltração continua sendo um dos principais problemas nessa área. Objetivo Avaliar “in vitro” a microinfiltração marginal das resinas Bulk Fill em cavidade classe II, com terminação cervical em dentina. Material e método Cavidades padronizados na mesial e distal foram elaboradas em quarenta dentes molares superiores e alocados aleatoriamente em quatro grupos (n=10), de acordo com a resina usada: G1 (controle): Filtek Z350(3M/ESPE); G2: Filtek Bulk Fill flow (3M/ESPE); G3: Surefill SDR (Dentsply); G4: X-tra base (Voco), sendo estes subdivididos em subgrupos considerando a estratégia adesiva aplicada (autocondicionamento e convencional). Após 24h de armazenamento em estufa (37 °C), as amostras foram submetidas ao teste de termociclagem (500 ciclos: 5 ºC/55 ºC). Posteriormente foram impermeabilizados, imersos em Fucsina Básica (0,5%) e seccionados no sentido mésio-distal para avaliação com lupa estereoscópica 40X (Coleman), sendo atribuído escores de 0 a 3 de acordo com a microinfiltração observada. Para análise estatística foi aplicado o teste Mann-Whitney e o Kruskal-Wallis com nível de significância de 5%. Resultado Não houve diferença estatística significante entre as resinas Bulk Fill, quando utilizada a técnica de condicionamento ácido total. Apenas a resina Filtek Bulk fill flow apresentou resultados estatisticamente significante quando se considerou a estrategia de aplicação do sistema adesivo, com piores resultados, em relação aos outros grupos. Conclusão O grau de infiltração em cavidades classe II das resinas bulk fill estudadas, não foi influenciado pelo modo de aplicação do sistema adesivo (convencional ou autocondicionante), exceto para Filtek Bulk fill flow.

Abstract Introduction Despite advances and innovations in restorative dentistry, microleakage remains one of the main problems in this area. Objective To evaluate in vitro marginal microleakage of Bulk Fill resins in class II cavities, with cervical termination in the dentin. Material and method Cavities, standardized on the mesial and distal surfaces, were prepared in forty top molars and randomly assigned to four groups (n = 10), according to the resin used. G1 (control): Filtek Z350 (3M/ESPE); G2: Filtek Bulk Fill flow (3M/ESPE); G3: Surefill SDR (Dentsply); G4: X-tra (Voco). These were further subdivided into subgroups according to the strategy used to apply the adhesive (self-etch technique and conventional). After storage for 24 hours in an oven (37 °C), the samples were submitted to the thermocycling test (500 cycles: 5 °C/55 °C). They were later waterproofed, immersed in Basic Fuchsin (0.5%) and sectioned in the mesial-distal direction for evaluation using a stereo magnifying glass at 40X (Coleman) Scores from 0 to 3 were assigned according to the microinfiltration observed. The Mann-Whitney and Kruskal-Wallis tests, with a significance level of 5%, were used for statistical analysis. Result There was no statistically significant difference between the Bulk Fill resins when the total acid-etching technique was used. Only the Filtek Bulk fill flow resin presented statistically significant results when the application of the adhesive system strategy was considered, with worse results, in relation to other groups, when it the self-etching strategy was considered. Conclusion The degree of leakage of the bulk fill resins studied, in class II cavities, was not influenced by the method of application of the adhesive system (conventional or two-step self-etching bonding agent), except for the Filtek Bulk fill flow.

RESUMO Objetivo Avaliar, in vitro, a estabilidade da união de cimentos resinosos ao substrato dental através da resistência de união e análise em microscopia eletrônica de varredura (MEV). Métodos Cinquenta e quatro terceiros molares humanos, armazenados em água por um curto (24 horas) e longo período de tempo (1 ano), tiveram a face oclusal removida expondo a superfície dentinária. Os dentes foram distribuídos em seis grupos distintos: G1- Panavia F2.0 / Kuraray; G2- RelyX Unicem / 3M ESPE; G3- G-Cem / GC; G4- BisCem / Bisco; G5- Panavia F2.0 / Kuraray sem pré-tratamento e G6- Multilink Sprint / Ivoclar-Vivadent que foram aderidas ao seu respectivo restaurações de resina composta indireta, (G1- Clearfil AP-X / Kuraray; G2- Filtek Z350 / 3M ESPE; G3- Gradia Direct X (tm) / GC; G4- Aelite (tm) / Bisco; G5- Clearfil AP-X / Kuraray; G6- Tetric Ceram / Vivadent Ivoclar-). Os blocos de resina foram cimentados e foram obtidos palitos, com área de interface adesiva de 0,8mm² (± 0,2). Resultados Os valores médios, submetidos à Mann-Whitney e Kruskal-Wallis testes (α = 5%) foram em MPa após 24 horas: G1 = 9,66 (A), G2 = 13,37 (A); G3 = 15,89 (A); G5 = 4,18 (B); G6 = 11,01 (A) e depois de 1 ano: G1 = 9,75 (A), G2 = 11,73 (A); G3 = 20,10 (B); G5 = 6,80 (A); G6 = 21,09 (B). O grupo todo G4 apresentou falhas pré-teste. Conclusão Durante o período de um ano de investigação, os cimentos de resinosos auto-adesivos, exceto o Bis Cem, eram uma alternativa favorável para a cimentação adesiva, destacando-se entre estes o G-Cem e Multilink Sprint.

ABSTRACT Objective The aim of this study was to evaluate, in vitro, the union stability of resin cements to the dental substract through microtensile bond strength (µTBS) analysis and scanning electron microscopy (SEM). Methods Fifty-four third human molars, stored in water for a short (24 hours) and long period of time (1 year) presented a flat oclusal superficial dentin. The teeth were distributed in six different groups: G1- Panavia F2.0/Kuraray; G2- RelyXUnicem/3M ESPE; G3- G-Cem/GC; G4- Biscem/ Bisco; G5- Panavia F2.0/Kuraray without pre-treatment and G6- Multilink Sprint/Ivoclar-Vivadent which were adhered to its respective indirect resin composite restoration, (G1- Clearfil AP-X/Kuraray; G2- Filtek Z350/3M ESPE; G3- Gradia Direct X(tm)/GC; G4- Aelite(tm)/ Bisco; G5- Clearfil AP-X/Kuraray; G6- Tetric Ceram/ Ivoclar-Vivadent). The resin blocks were cemented and the sticks were obtained by tooth, with an area of adhesive interface of 0,8mm² (±0,2). Results The mean values, submitted to Mann-Whitney and Kruskal-Wallis tests (α = 5%) were in MPa after 24 hours: G1 = 9.66 (A), G2 = 13.37 (A); G3 = 15.89 (A); G5 = 4.18 (B); G6 = 11.01 (A) and after 1 year: G1 = 9.75 (A), G2 = 11.73 (A); G3 = 20.10 (B); G5 = 6.80 (A); G6 = 21.09 (B). All G4 group presented pretest failures. Conclusion During the one year period, with the exception of BisCem, the self-adhesive resin cements were a favorable alternative for the adhesive cementation, standing out among these, the G-Cem and Multilink Sprint.

RESUMO JUSTIFICATIVA E OBJETIVOS: A amelogênese imperfeita é caracterizada por defeitos estruturais do esmalte, os quais podem acometer gravemente a estrutura dentária, em ambas as dentições. Quando acometida por lesões cariosas graves, pode comprometer o complexo pulpar, necessitando de tratamento endodôntico, e em se tratando de dentes com rizogênese incompleta, o tratamento torna-se mais complexo, em virtude do volume pulpar e das condições anatômicas. O objetivo deste estudo foi relatar um caso clínico de paciente com amelogênese imperfeita e que teve como consequência múltiplos casos de rizogênese incompleta. RELATO DO CASO: Paciente do gênero feminino, 12 anos, leucoderma, com sintomas dolorosos procurou atendimento odontológico. Ao exame clinico intraoral, apresentava dentes com alteração de forma e tamanho, coloração amarelada, recobertos por uma fina camada de esmalte com superfície rugosa e em algumas áreas ausente, com fístula na região do sulco vestibular anterior e sem edema. Ao exame radiográfico ambas as dentições mostraram-se acometidas por anomalia, com retardo na cronologia de erupção dos dentes permanentes. Ao final de todos os exames, recebeu o diagnóstico de amelogênese imperfeita, dando inicio ao tratamento, que começou pelo tratamento periodontal, seguido pelo endodôntico. CONCLUSÃO: O tratamento da amelogênese é complexo, principalmente quando em estágios mais avançados de destruição da estrutura dentária. Contudo é possível restabelecer a funcionalidade e a estética do paciente quando se faz um bom planejamento do caso, com interação multidisciplinar.

ABSTRACT BACKGROUND AND OBJECTIVES: Amelogenesis imperfecta is characterized by enamel structural defects, which may severely affect dental structure in both dentitions. When accompanied by severe decay, it may impair the pulp complex requiring endodontic treatment and in case of incomplete root formation treatment becomes more complex due to pulp volume and anatomic conditions. This study aimed at reporting a clinical case of patient with amelogenesis imperfecta and with multiple incomplete root formation as a consequence. CASE REPORT: Female patient, 12 years old, leucodermic, with painful symptoms, who has looked for dental assistance. At intraoral clinical evaluation teeth presented with shape and size changes, yellowish color, covered by a thin enamel layer with roughened surface and absent in some areas, with anterior vestibular sulcus fistula and without edema. At radiographic evaluation, both dentitions were affected by the abnormality with delayed chronology of permanent teeth eruption. At the end of all evaluations, patient was diagnosed with amelogenesis imperfecta, and periodontal treatment was started, followed by endodontic treatment. CONCLUSION: Amelogenesis treatment is complex, especially when in more advanced stages of dental structure destruction. However, it is possible to reestablish patient’s functionality and esthetics with good planning and multidisciplinary approach.

OBJETIVO: Avaliar o grau de resistência de união à dentina dos sistemas adesivos de condicionamento ácido total Adper Single Bond (3M ESPE) e XP Bond (Dentsply) e autocondicionante Adper SE Plus (3M ESPE). MÉTODOS: Quinze terceiros molares humanos hígidos foram utilizados, divididos aleatoriamente em três grupos de cinco dentes cada, conforme o adesivo que seria utilizado. A porção oclusal foi removida com o auxílio de um disco flexível diamantado sob refrigeração, até expor uma área de dentina que não apresentasse ilhas de esmalte, comprovado em lupa esterioscópica em aumento de 40X. A smear layer foi padronizada em lixa d'água n°600. Na sequência os sistemas adesivos foram aplicados conforme as recomendações do fabricante, exceto o Adper SE Plus que teve seu tempo de polimerização triplicado. Sobre os dentes preparados foram construídos blocos de resina composta com 5mm de altura. As amostras foram armazenadas por 24 horas a 37°C em água destilada. Utilizando o disco flexível diamantado, foram obtidos corpos de prova com formato de palitos com área adesiva menor que 1mm². Em seguida o teste de microtração foi realizado numa Máquina de Ensaios Universal numa velocidade de 0,5 mm/min. Foram utilizados o teste ANOVA e comparações pareadas de Tukey. RESULTADOS: Os valores da resistência de união para cada sistema adesivo em Mpa foram: 96,24 (XP Bond); 72,39 (Adper Single Bond) e 49,91 (Adper SE Plus). CONCLUSÃO: Dessa forma, em relação à resistência de união à dentina, os adesivos convencionais apresentaram desempenho superior ao autocondicionante.

OBJECTIVE: To assess the bond strength to dentin of the Single Bond (3M ESPE) and XP Bond (Dentsply) total-etch and Adper SE Plus (3M ESPE) self-etch adhesive systems. METHODS: Fifteen healthy human third molars were randomly allocated across three different groups of five teeth each according to the adhesive system. The occlusal portion of each tooth was removed under refrigeration using a flexible diamond disc (EXTEC, Enfield, CT, USA) down to an area of dentin that did not reveal enamel, as confirmed under a 40X stereo microscope (Ramsor, São Paulo, Brazil). A standardized smear layer was created with #600 grit silicon-carbide paper. The adhesive systems were applied as per manufacturer recommendations, with the exception of the Adper SE Plus system, which was triple-polymerized. Composite resin blocks (5 mm) were placed on the dentin surface. The specimens were stored in distilled water for 24 hours at 37ºC. Using a flexible diamond disc (EXTEC, Enfield, CT, USA), toothpick-like specimens with an adhesive area of less than 1 mm² were obtained. A microtensile bond test was then carried out using a universal testing machine (KRATOS) with a crosshead speed of 0.5 mm/min. Analysis of variance (ANOVA) and Tukey's test were used for comparisons. RESULTS: The bond strength values obtained with each adhesive system were as follows: XP Bond, 96.24 MPa; Adper Single Bond, 72.39 MPa; Adper SE Plus, 49.91 MPa. CONCLUSION: In terms of bond strength to dentin, conventional adhesives outperform self-etching systems.

We evaluated the influence of photoactivation method and hydrophobic resin (HR) application on the marginal and internal adaptation, hardness (KHN), and crosslink density (CLD) of a resin-based fissure sealant. Model fissures were created in bovine enamel fragments (n = 10) and sealed using one of the following protocols: no adhesive system + photoactivation of the sealant using continuous light (CL), no adhesive system + photoactivation of the sealant using the soft-start method (SS), HR + CL, or HR + SS. Marginal and internal gaps and KHN were assessed after storage in water for 24 h. The CLD was indirectly assessed by repeating the KHN measurement after 24 h of immersion in 100% ethanol. There was no difference among the samples with regard to marginal or internal adaptation. The KHN and CLD were similar for samples cured using either photoactivation method. Use of a hydrophobic resin prior to placement of fissure sealants and curing the sealant using the soft-start method may not provide any positive influence on integrity or crosslink density.

Este estudo avaliou in vitro a influência do clareamento do esmalte na resistência ao cisalhamento à dentina. Cento e vinte incisivos bovinos foram divididos em 12 grupos (n=10), de acordo com o sistema adesivo: Adper Single Bond 2 (ASB2), Prime & Bond 2.1 (PB), Adhese (AD) and Clearfil SE Bond (SE). Os grupos experimentais foram submetidos ao clareamento com peróxido de carbamida a 10% por um período de 10 dias, com exposições diárias por 4 horas. Após o clareamento, permaneceram armazenados em saliva artificial por 24h ou 7 dias. Os grupos controle foram armazenados em saliva artificial por 24h. Amostras de resina composta (Z250) foram confeccionadas e armazenadas em água destilada (37ºC/24h), até a realização dos testes. Os resultados foram analisados por meio da ANOVA 3 fatores e teste de Turkey (a<0.05). A maior media para os grupos experimentais foi veri - ficada para o ASB2 (7d) e a menor para PB (24h). Diferenças estatisticamente significante foram observadas para os fatores clareamento e sistema adesivo, porém não foi verificada para o tempo de armazenamento. Em acréscimo, a interação entre as variáveis mostrou-se significante. Diferença estatisticamente significante foi encontrada entre os sistemas adesivos para as diferentes situações de clareamento e tempo de armazenamento. Conclui-se que o clareamento do esmalte dentário e o tempo de armazenamento em saliva artificial intereferiu na união à dentina para os adesivos Prime & Bond 2.1 e Clearfil SE Bond.

This study evaluated in vitro the influence of enamel bleaching on bond strength to dentin. One hundred and twenty bovine incisors were divided into 12 groups (n=10), according to adhesive system: Adper Single Bond 2 (ASB2), Prime & Bond 2.1 (PB), Adhese (AD) and Clearfil SE Bond (SE). The experimental groups were exposed to 10% carbamide peroxide for 4 hours a day over a period of 10 days. After the bleaching, they remained stored in artificial saliva for a further 24 hours or 7 days. The control groups were stored in artificial saliva for 24hs. Resin composite (Z250) cylinders were made, and the specimens were stored in distilled water (37ºC/24h), until the shear strength test was performed. The results were statistically analyzed using ANOVA 3-way and Turkey's test (a<0.05). The highest mean value of experimental groups was obtained for ASB2 (7d) and the lowest for PB (24h). Significant differences were observed for bleaching and adhesive system, but not for storage time. Moreover, the interaction between the factors under study was shown to be significant. Statistical differences were observed between the tested adhesives for the different bleaching situations and storage times. It may be concluded that dental enamel bleaching and storage time in artificial saliva interfered with the bond strength to subjacent dentin provided by the Prime & Bond 2.1 and Clearfil SE Bond.

Esse estudo teve como objetivo avaliar a influência do tempo de aplicação de agentes antioxidantes sobre a resistência de união ao esmalte dental bovino após clareamento, através do teste de microtração. Foram utilizados 22 incisivos bovinos, onde as faces vestibulares foram planificadas, sendo divididos em 4 grupos experimentais (n=15) de acordo com cada agente antioxidante, com dois subgrupos cada, variando o tempo de aplicação deste em 1 ou 10 minutos, todos submetidos ao mesmo agente clareador (Lase Peroxyde) e o grupo controle foi apenas restaurado. Enquanto os demais grupos receberam tratamento com os respectivos agentes antioxidantes, previamente ao procedimento restaurador, sendo utilizado o sistema adesivo All Bond 3 e a resina composta Filtek Z-350. Para obtenção dos fragmentos dentais, os dentes foram posicionados numa cortadeira de precisão (Elquip), obtendo-se palitos com 0,8 mm² que foram submetidos ao teste de microtração, a uma velocidade de ensaio de 0,5mm/min. Os resultados, analisados estatisticamente por ANOVA e teste de Tukey (p<0,05), indicaram um aumento no valor da resistência de união dos grupos clareados e tratados com ácido ascórbico, e uma redução quando em associação com tiossulfato de sódio, nos demais não houve melhora na resistência de união.

The aim of this study was to evaluate the influence of time of application of antioxidant agents on the bond strength to bovine enamel after bleaching by light emitting diode. Twenty two bovine incisors were used, on which the vestibular surfaces were flattened and divided into four experimental groups (n = 15) according to each antioxidant agent, with two groups each, varying the application time of 1 or 10 minutes, all submitted to the same whitening agent (Lase Peroxide) and the control group was only restored. The other groups were treated with antioxidant agents before the restorative procedure using the adhesive system All Bond 3 and resin Filtek Z-350. To obtain the dental fragments, teeth were placed in a precision cutter (Elquip), obtaining 0.8 mm ² with sticks that were submitted to micro tensile testing at a test speed of 0.5 mm / min. The results, statistically analyzed by ANOVA and Tukey test (p <0.05), indicated an increase in the value of bond strength of bleached groups treated with ascorbic acid, and a reduction when combined with sodium thiosulfate. No improvement in bond strength was found in the others.

Las fracturas coronarias constituyen problemas dentales frecuentes, especialmente en los niños y los adolescentes. Cuando ocurre, particularmente en la región anterior, el tratamiento rehabilitador tiene la función de recuperar la función y la estética de los dientes que fueron dañados por el trauma. El recubrimiento del fragmento, cuando es posible, crea una respuesta emocional positiva en el paciente y simplifica el mantenimiento de la oclusión original. En este caso, los autores exponen el tratamiento de una fractura oblicua de corona-raíz en el incisivo lateral superior con invasión del espacio biológico. Tres años después del tratamiento, el diente mostró función normal, estética favorable y una buena salud periodontal. Podemos concluir que la técnica de recubrimiento del fragmento ofrece la posibilidad de una rehabilitación estética y funcional con características más semejantes a la dentición natural, teniendo siempre que ser considerada como una de las alternativas de tratamiento para dientes fracturados, donde se tenga el fragmento dental

En la actualidad ningún material odontológico de uso indirecto sufrió mayor evolución que las cerámicas. El aumento del contenido cristalino mejoró sus propiedades mecánicas, aumentando las opciones de sus indicaciones clínicas. Por lo tanto, esas alteraciones en la composición llevaron a una diferenciación de los procedimientos para la cementación. Anteriormente, la cementacion adhesiva era obligatoria para todas las cerámicas, lo que actualmente ya no es una verdad absoluta. De esta manera, el objetivo de este trabajo de revisión de literatura es establecer el protocolo más indicado para la cementación de las diversas categorías de sistemas cerámicos, teniendo como base las características estructurales de cada material, dando los subsídios para elegir el correcto tratamiento de superficie, agente cementante y sistema adhesivo

At the present time no dental material for indirect restorations developed more than ceramics. The augmented crystalline content improved their mechanical properties increasing their range of clinical indications. However, these composition alterations carried to different surface treatments protocols for cementation. Previously, the adhesive luting was the standard procedure for all ceramics; nowadays these differences in composition represent a challenge for the clinician, regarding the surface treatment and luting procedures. Thus, the objective of this revision is to establish the most suitable protocol for surface treatment and cementation of several ceramic systems, based on the structural characteristics of each material, giving assistance for a correct choice of the correct surface treatment, luting agent and adhesive system

Los cementos resinosos duales son agentes de cementación lanzados en el mercado con el fin de unir las características favorables de los cementos resinosos fotoactivados y de los autopolimerizados. Actualmente, son utilizados en situaciones donde existe la pérdida o la ausencia de luz debido a la distancia de la fuente activadora al agente cementante, como en los casos clínicos envolviendo la utilización de pernos intracanales, o en situaciones donde existe la atenuación del pasaje de luz a causa de la interposición de un material restaurador indirecto metálico o de un material restaurador indirecto estético espeso. Sin embargo, la literatura muestra que si un cemento resinoso dual es polimerizado de manera inadecuada puede estar asociado a la disminución de sus propiedades causando falla en el procedimiento restaurador ejecutado. Así, el presente trabajo tiene como objetivo hacer una revisión crítica acerca de la necesidad de fotoactivación de los cementos resinosos duales a través de trabajos que evalúen las propiedades de estos materiales cuando sometidos a la activación química, foto y dual

The dual-cure resin cements are luting agents with the intention to join the favorable characteristics of light-cure and self-cure resin cements. Nowadays, they are been used when there is loss or absence of light due to distance of the activation source to the luting agent as in clinical cases involving the use of endodontic posts, or in situations in which there is reduction of the light passage due to metallic indirect restoring material or an indirect restoring aesthetic thick material. However, the literature shows that if a dual-cure resin cement goes inadequately polymerized it can be associated to the decrease of their properties and consequently clinical failures. Therefore, the present work aims to do a critical review about the need of photoactivation of dual- cure resin cements throught articles that evaluate the properties of these materials when submitted to the chemical, light and dual activation

The objective of this study was to compare the flexural strength and elasticity modulus of two types of staple reinforcement fibers, Interlig - Ângelus®/glass (Londrina, PR, Brazil) and Connect - KerrLab®/polyethylene (MFG Co., West Collins Orange, CA, USA), which are widely used in Dentistry for chairside use, after varying the number of layers employed and submitting or not to thermocycling. This study was performed on 72 specimens, divided into 8 groups: G1 - single layer of Interlig fibers without thermocycling; G2 - double layer of Interlig fibers without thermocycling; G3 - single layer of Interlig fibers with thermocycling; and G4 - double layer of Interlig fibers with thermocycling; G5 - single layer of Connect fibers without termocycling; G6 - double layer of Connect fibers without termocycling; G7 - single layer of Connect fibers with termocycling; G8 - double layer of Connect fibers with termocycling. For each group, values for flexural strength and elasticity modulus were obtained. The polyethylene fiber employed in a double layer presented the highest flexural strength (p < 0.05), independently of thermocycling (p < 0.001), when compared to the other evaluated combinations. The polyethylene fiber, used in a single layer without thermocycling, demonstrated a significantly higher elasticity modulus, when compared to the other groups (p < 0.05). Within the limits of this study, it was concluded that the polyethylene fiber in a double layer appears to be more resistant, regardless of whether it was submitted to thermocycling or not.

En la actualidad, la sociedad prácticamente exige una uniformidad de las características relacionadas con la apariencia física de las personas, lo que hace aumentar la búsqueda por los tratamientos que proporcionen un aspecto más agradable, vinculado a técnicas eficientes y seguras. Las alteraciones dentarias de color, de forma, textura y/o posición contribuyen de modo desfavorable, principalmente en los dientes anteriores, para una armonía facial. El uso de las facetas estéticas, directamente en la boca, es cada vez más enfatizado debido a evolución de los materiales restauradores y de la técnica adhesiva, ofreciendo una mejor relación costo/beneficio para el paciente. El objetivo del presente artículo es presentar casos clínicos en los cuales el tratamiento con facetas directas es una alternativa de tratamiento eficaz, reversible y de fácil realización.

At present, society practically demands uniformity of features in relation to physical appearance, resulting in an increasing number of persons seeking treatment that will provide them with a more pleasant visual appearance, linked to efficient and safe techniques. Alterations in tooth shade, shape, texture and/or position, particularly of anterior teeth, contribute unfavorably to facial harmony. Aesthetic facets placed directly in the mouth have been increasingly emphasized, due to the development of restorative materials and adhesive techniques, offering the patient an even better cost/benefit ratio. The aim of this article is to present clinical cases in which the direct facet was shown to be an efficient, reversible and easy to perform alternative treatment.