CONHECIMENTO SOBRE BEIJO NA BOCA DE ADOLESCENTES DE UM GRUPO DE ESCOLAS PRIVADAS DE NOVA IGUAÇU/RIO DE JANEIRO ­ ESTUDO PILOTO / KNOWLEDGE ABOUT KISSING IN THE MOUTH OF ADOLESCENTS FROM A GROUP OF PRIVATE SCHOOLS IN NOVA IGUAÇU / RIO DE JANEIRO - PILOT STUDY

Objetivo: Descrever os conhecimentos sobre o beijo na boca e sua possibilidade de transmissão de doenças infecciosas em um grupo de adolescentes de escolas privadas de Nova Iguaçu/Rio de Janeiro, através deste estudo piloto. Metodologia: Estudo seccional em que foi aplicado um roteiro de perguntas semi-estruturado autoaplicável em adolescentes (de 18 e 19 anos) de ambos os gêneros, pertencentes a três escolas da rede de ensino privado do município de Nova Iguaçu no Estado do Rio de Janeiro. Resultados: De um total de 100 adolescentes que participaram deste estudo, mais da metade eram solteiros e do gênero feminino (61%), apenas estudantes como ocupação (88% do total) e 96% já haviam beijado na boca. A amostra selecionada demonstrou características próprias, com a alta frequência do conhecimento da possibilidade de transmissão de doenças infecciosas pelo beijo na boca e saliva (71%), que possivelmente se confirmou pela baixa ocorrência de lesões após o ato do beijo e pela observação da boca do parceiro antes de beijar. Conclusão: A pratica do beijo na boca e o sexo oral devem ser temáticas consideradas na assistência fornecida a adolescentes. O uso de estratégias preventivas e o acesso às redes sociais podem contribuir para a redução de situações de risco advindos de situações de vulnerabilidade.

Aim: To describe the knowledge about the kiss on the mouth and its possibility of transmission of infectious diseases in a group of adolescents from private schools in Nova Iguaçu / Rio de Janeiro, through this pilot study. Methodology: Cross-sectional study in which a self-administered semi-structured question script was applied to adolescents (18 and 19 years) of both genders, belonging to three schools of the private school system of Nova Iguaçu, Rio de Janeiro State. Results: Of a total of 100 adolescents who participated in this study, more than half were single and female (61%), only students as occupation (88% of the total) and 96% had already kissed the mouth. The selected sample demonstrated its own characteristics, with the high frequency of the knowledge of the possibility of transmission of infectious diseases by kissing in the mouth and saliva (71%), which was possibly confirmed by the low occurrence of lesions after the kiss and the observation of the mouth. of the partner before kissing. Conclusion: The practice of kissing on the mouth and oral sex should be thematic considered in the care provided to adolescents. The use of preventive strategies and access to social networks can contribute to the reduction of risk situations arising from vulnerability situations. Keywords: mouth, infectious diseases, adolescent (s), health education, strategies and oral health

Influence of custom adaptation on the characteristics of fiber posts.

In this in vitro study, 3 experiments were conducted to evaluate the influence of customizing the apical portion on the characteristics of fiber posts. In the first experiment, 4 fiber posts were submitted to different custom adaptations (no customization, industrial shaping tool, diamond bur, or paper disc) and were observed with a scanning electron microscope to evaluate the micromorphologic changes. In the second experiment, 60 posts of different sizes were divided into 6 groups (n = 10): 0 (No. 0.5), 1 (No. 1), 2 (No. 2), 3 (No. 3), 4 (No. 4), and 5 (paper disc-remodeled No. 4). The posts were submitted to a 3-point bending test. In the third experiment, the crowns of 20 extracted, healthy permanent human canines were removed, and the teeth were endodontically treated, embedded in acrylic resin, and divided into 2 groups (n = 10): I (control), No. 4 posts cemented into post spaces prepared with a No. 4 drill; and II (test), remodeled No. 4 posts cemented into root spaces prepared with No. 2 and 4 drills. The posts were cemented with self-adhesive dual resin cement, and the specimens received direct resin crowns. Fracture strength was measured with a universal testing machine at 45 degrees until fracture. Results were submitted to analysis of variance (P ≤ 0.05). Customization of fiber posts with diamond burs or paper discs produced acceptable micromorphologic changes. Custom adaptation of fiber posts reduced their flexural strength, which remained at acceptable values. Teeth restored with customized fiber posts had greater fracture strength than those restored with intact posts. The results of this study indicated that post remodeling is a safe means to facilitate adaptation to root walls and preserve tooth structure.

Effect of Non-Thermal Argon Plasma on Bond Strength of a Self-Etch Adhesive System to NaOCl-Treated Dentin.

Studies have been showing a decrease of bond strength in dentin treated with sodium hypochlorite (NaOCl). The aim of this study was to evaluate the effect of non-thermal argon plasma on the bond strength of a self-etch adhesive system to dentin exposed to NaOCl. Thirty-two flat dentin surfaces of bovine incisors were immersed in 2.5% NaOCl for 30 min to simulate the irrigation step during endodontic treatment. The specimens were divided into four groups (n=8), according to the surface treatment: Control (without plasma treatment), AR15 (argon plasma for 15 s), AR30 (argon plasma for 30 s) and AR45 (argon plasma for 45 s). For microtensile bond strength test, 5 specimens were used per group. In each group, the specimens were hybridized with a self-etch adhesive system (Clearfil SE Bond) and resin composite buildups were constructed. After 48 h of water storage, specimens were sectioned into sticks (5 per tooth, 25 per group) and subjected to microtensile bond strength test (µTBS) until failure, evaluating failure mode. Three specimens per group were analyzed under FTIR spectroscopy to verify the chemical modifications produced in dentin. µTBS data were analyzed using ANOVA and Tamhane tests (p<0.05). AR30 showed the highest µTBS (20.86±9.0). AR15 (13.81±6.4) and AR45 (11.51±6.8) were statistically similar to control (13.67±8.1). FTIR spectroscopy showed that argon plasma treatment produced chemical modifications in dentin. In conclusion, non-thermal argon plasma treatment for 30 s produced chemical changes in dentin and improved the µTBs of Clearfil SE Bond to NaOCl-treated dentin.

Effect of Non-Thermal Argon Plasma on Bond Strength of a Self-Etch Adhesive System to NaOCl-Treated Dentin

Abstract Studies have been showing a decrease of bond strength in dentin treated with sodium hypochlorite (NaOCl). The aim of this study was to evaluate the effect of non-thermal argon plasma on the bond strength of a self-etch adhesive system to dentin exposed to NaOCl. Thirty-two flat dentin surfaces of bovine incisors were immersed in 2.5% NaOCl for 30 min to simulate the irrigation step during endodontic treatment. The specimens were divided into four groups (n=8), according to the surface treatment: Control (without plasma treatment), AR15 (argon plasma for 15 s), AR30 (argon plasma for 30 s) and AR45 (argon plasma for 45 s). For microtensile bond strength test, 5 specimens were used per group. In each group, the specimens were hybridized with a self-etch adhesive system (Clearfil SE Bond) and resin composite buildups were constructed. After 48 h of water storage, specimens were sectioned into sticks (5 per tooth, 25 per group) and subjected to microtensile bond strength test (μTBS) until failure, evaluating failure mode. Three specimens per group were analyzed under FTIR spectroscopy to verify the chemical modifications produced in dentin. μTBS data were analyzed using ANOVA and Tamhane tests (p<0.05). AR30 showed the highest μTBS (20.86±9.0). AR15 (13.81±6.4) and AR45 (11.51±6.8) were statistically similar to control (13.67±8.1). FTIR spectroscopy showed that argon plasma treatment produced chemical modifications in dentin. In conclusion, non-thermal argon plasma treatment for 30 s produced chemical changes in dentin and improved the μTBs of Clearfil SE Bond to NaOCl-treated dentin.

Resumo Estudos vêm demonstrando uma diminuição na resistência adesiva em dentina tratada com hipoclorito de sódio (NaOCl). O objetivo desse estudo foi avaliar o efeito do plasma de argônio não-térmico na resistência de união de um sistema adesivo autocondicionante à dentina exposta ao NaOCl. Trinta e duas superfícies dentinárias lisas de incisivos bovinos foram imersas em NaOCl a 2,5% por 30 min para simular o passo de irrigação durante o tratamento endodôntico. Os espécimes foram divididos em 4 grupos (n=8), de acordo com o tratamento de superfície: Controle (sem tratamento de plasma), AR15 (plasma de argônio por 15 s), AR30 (plasma de argônio por 30 s) e AR45 (plasma de argônio por 45 s). Para teste de resistência de união por microtração, cinco espécimes foram utilizadas por grupo. Em cada grupo, os espécimes foram hibridizados com um sistema adesivo autocondicionante (Clearfil SE Bond, Kuraray) e blocos de resina composta foram construídos. Após 48 h de armazenamento em água, os espécimes foram seccionados em palitos (5 por dente - 25 por grupo) e submetidos ao teste de resistência de união por microtração (μTBS) até a fratura, avaliando o padrão de fratura. Três amostras por grupo foram analisadas sob espectroscopia por FTIR para verificar as modificações químicas produzidas pelos tratamentos na dentina. Os dados de microtração foram avaliados estatisticamente utilizando os testes de ANOVA e Tamhane (p<0,05). AR30 apresentou o maior μTBS (20,86±9,0). AR15 (13,81±6,4) e AR45 (11,51±6,8) foram estatisticamente semelhantes ao controle (13,67±8,1). A espectroscopia por FTIR mostrou que o tratamento de plasma produziu modificações químicas na dentina. Como conclusão, o tratamento de plasma de argônio não-térmico por 30 s produziu alterações químicas na dentina e melhorou o μTBS do Clearfil SE Bond à dentina tratada com NaOCl.

Reestabelecendo a estética com restauração de resina composta anterior / Reestablishing aesthetics with composite resin anterior restorations

O traumatismo dentário é uma das principais causas de perda de estrutura dentária em jovens por etiologia não bacteriana. Esse tipo de lesão acomete comumente elementos anteriores. A abordagem conservadora desses casos, quando possível, é a colagem de fragmento, mas quando não houver essa possibilidade é necessária a reabilitação com compósitos resinosos. O presente trabalho descreve a substituição de uma restauração em resina composta que se apresenta pigmentada no elemento 21, que havia sido fraturado por trauma durante a adolescência(AU)

Dental trauma is major causes of tooth structure loss in young patients, which is not related to bacterial ethiology. This type of lesion occurs more commonly in anterior teeth. Tooth fragment reattachment is a conservative approach to these cases, whenever it is possible. When this option is not feasible, composite resin restoration may be indicated. This article presents the replacement of a discolored composite restoration in tooth # 21, which has been fractured by trauma when the patient was a teenager(AU)

Amálgama dental e seu papel na Odontologia atual / Dental amalgam and its role in current dentistry

O Amálgama de Prata (AP) é um material restaurador consagrado pelo uso na Odontologia. Embora nos últimos anos tenha havido uma procura maior pelas restaurações estéticas, ao se considerar aspectos inerentes à eficácia, eficiência, custo e efetividade, particularmente em Saúde Pública, o AP, quando indicado, permanece como material de eleição para restaurações posteriores intracoronárias. Há uma tendência mundial de banir o uso do AP devido à toxicidade do mercúrio para o ambiente e para a saúde humana, mas não existem evidências científicas sobre isto. De concreto, há necessidade de realizar o gerenciamento de resíduos químicos de AP. Sendo assim, o objetivo deste estudo é revisar na literatura sobre o gerenciamento de resíduos do AP e colaborar nesta orientação, propondo um guia.

The Silver Amalgam (SA) is a restorative material established by custom in dentistry. Although in recent years there has been a greater demand for esthetic restorations, when considering issues related to the effectiveness, efficiency, cost-effectiveness, particularly in Public Health, the SA, when indicated, remains the material of choice for intra-coronary posterior restorations. There is a global trend to ban the use of SA due to the toxicity of mercury to the environment and to human health, but have no scientific evidence of this. Specifically, there is need for the management of chemical waste SA. Thus, the aim of this study is to review the literature on the SA waste management and collaborate in this direction by proposing a guide.

Dental bleaching agents with calcium and their effects on enamel microhardness and morphology

Aim: To evaluate enamel microhardness and morphology after bleaching with hydrogen peroxide containing calcium in different concentrations. Methods: One hundred specimens of human teeth were ground and polished and had the initial microhardness evaluated. The specimens were randomly assigned into five groups (n=20): Group 1 - Control group (no treatment); Group 2 - Home Peroxide 6% (without calcium); Group 3 - Home Peroxide 7.5% (without calcium); Group 4 - White Class 6% (with calcium); Group 5 - White Class 7.5% (with calcium). For each group, the bleaching was performed according to the manufacturer's specifications. The specimens were bleached once a day for 5 days and subjected to pH cycling. Microhardness and scanning electron microscopy (SEM) analysis were performed before and after bleaching. Results: The results showed that groups submitted to bleaching treatment presented hardness loss compared to the control group. The group of 7.5% hydrogen peroxide with calcium showed a lower percentage of hardness loss in relation to other groups. Conclusion: Calcium in association with a higher hydrogen peroxide concentration may decrease microhardness changes on enamel.

Surface roughness of different composite resins subject to in-office bleaching.

This study used atomic force microscopy to evaluate the effects of an in-office dental bleaching protocol on the surface roughness of 3 resins: microfilled, microhybrid, and nanofilled. Two disks of each resin were prepared and evaluated. Twenty-four areas (5 x 5 µm) were scanned using an atomic force microscope. Then, each disk was treated with 35% hydrogen peroxide activated by a light emitting diode. After bleaching, the disks were scanned again. Data from the 24 areas before and after bleaching were evaluated qualitatively using topographical and 3-dimensional images, as well as profile lines. Quantitatively, roughness data (mean roughness and root mean square) were statistically evaluated using standard ANOVA and Student-Newman-Keuls tests (P < 0.05). The bleaching procedure increased roughness for each resin analyzed. Based on the results, it was concluded that in-office bleaching with 35% hydrogen peroxide-based gel significantly increased the surface roughness of microfilled, microhybrid, and nanofilled resins.

Effect of in-office bleaching agents on the surface roughness and morphology of different dental composites: an AFM study.

The aim of this study was to evaluate, using atomic force microscopy, the effect of two different bleaching agents on the modification of dental composites materials. This modification will be judged by analyzing the variation of surface roughness and surface morphology of two different composites: one containing nanoparticles and other consisting of microhybrid resin. The bleaching was performed by using two different concentrations of hydrogen peroxide: HP Blue (20% hydrogen peroxide) and Whiteness HP Maxx (35% hydrogen peroxide). Disks of Esthet X and Filtek™ Z350 composites were used. Atomic force microscopy was used for analyses of the same place of the sample before and after treatment. A total of 12 analyses were performed per group (n = 12). The samples were analyzed qualitatively by evaluating morphological changes in the images and quantitatively by using roughness parameters (Ra). Data were analyzed statistically using Kruskal-Wallis, Mann-Whitney, and Friedman tests (P < 0.05). Changes were observed both qualitatively and quantitatively only in the groups where Esthet X resin was used. The use of hydrogen peroxide bleaching agents caused changes only in the surface of microhybrid composites, with no changes being observed in the composite containing nanoparticles. Despite being even significant, these alterations are clinically slight and can be eliminated by polishing them.

Dual-scan technique for the customization of zirconia computer-aided design/computer-aided manufacturing frameworks.

The use of bi-layered all-ceramic crowns has continuously grown since the introduction of computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia cores. Unfortunately, despite the outstanding mechanical properties of zirconia, problems related to porcelain cracking or chipping remain. One of the reasons for this is that ceramic copings are usually milled to uniform thicknesses of 0.3-0.6 mm around the whole tooth preparation. This may not provide uniform thickness or appropriate support for the veneering porcelain. To prevent these problems, the dual-scan technique demonstrates an alternative that allows the restorative team to customize zirconia CAD/CAM frameworks with adequate porcelain thickness and support in a simple manner.

Eficácia da barreira cervical no clareamento intracoronário: uma revisão de literatura / Efficacy of cervical barrier in intracoronal bleaching: A literature review

O objetivo desse estudo foi discorrer, por meio de uma revisão da literatura, a eficácia seladora da barreira cervical no clareamento intracoronário. A técnica walking bleaching é utilizada em dentes desvitalizados que sofreram alterações cromáticas. Contudo, seu uso pode estar associado a efeitos adversos, como a reabsorção radicular externa. Para minimizar este risco, sugere-se o emprego de uma barreira cervical na embocadura do canal radicular. Para este fim, vários materiais como os cimentos de ionômero de vidro, fosfato de zinco, óxido de zinco sem eugenol e MTA podem ser utilizados. Observou- se que nenhum dos materiais apresentou um vedamento hermético, sendo necessário realizar, além da barreira cervical, condutas clínicas para minimizar os riscos de reabsorção radicular externa após o clareamento intracoronário.

The aim of this study is review the existing literature on the cervical barrier sealing effectiveness in intracoronal bleaching. The walking bleaching technique is used in devitalized teeth that have suffered color changes. However, its use may be associated with adverse effects, such as external root resorption. It has been suggested the use of a cervical barrier at the mouth of the canal in order to minimize this risk. A variety of materials such as glass ionomer cement, zinc phosphate, zinc oxide without eugenol and MTA can be used for this purpose. It was found that none of the materials tested showed a hermetic sealing being necessary, in addition to cervical barrier preparation, other clinical procedures in order to minimize the risk of external root resorption following intracoronal bleaching.

Cimentação adesiva de pinos fibrorreforçados / Adhesive cementation of fiber reinforced posts

Os pinos resinosos fibrorreforçados cimentados adesivamente desempenham importante papel no tratamento restaurador contemporâneo, sendo considerados substitutos dos pinos metálicos pré-fabricados ou fundidos. O objetivo deste trabalho é revisar a literatura acerca da cimentação adesiva desses pinos, apresentando os tipos de cimento disponíveis e sua estratégia adesiva envolvida, assim como as dificuldades inerentes à cimentação no interior de condutos radiculares.

The adhesively bonded fiber reinforced composite posts (FRCP) play an important role in the contemporary restorative dentistry treatment, being considered as substitutes for prefabricated or cast metal posts. The aim of this article is to review the existing literature regarding FRCP, the available cement options and their adhesive strategy, along with the inherent difficulties to root canal cementation.

Próteses parciais fixas totalmente cerâmicas: fatores que determinam sucesso e fracasso / All ceramic fixed partial dentures: factors that determine success and failure

Apesar do advento dos implantes osseointegráveis, as próteses parciais fixas continuam a ser restaurações com larga utilidade no arsenal restaurador dos cirurgiões-dentistas. No entanto, a exigência estética dos dias atuais faz com que as próteses livres de metal ocupem o lugar das consagradas próteses metalocerâmicas. Sendo assim, diversos fatores devem ser compreendidos e avaliados para se planejar a confecção de uma prótese parcial fixa totalmente cerâmica. O objetivo desta revisão é expor os fatores que podem determinar o sucesso ou fracasso de próteses parciais fixas totalmente cerâmicas.

Despite the advent of osseointegrated implants, fixed partial dentures remain to have a broad utility in the restorative arsenal of the dentists. However, modern day esthetic requirements causes metal-free prosthesis take the place once occupied in the past by the classic porcelain fused to metal FPDs. This way, several factors must be understood and assessed to plan the fabrication of an all- -ceramic fixed partial denture. The purpose of this review article is to look at the factors that can determine success or failure of all-ceramic fixed partial dentures.

Changes in surface roughness and color stability of two composites caused by different bleaching agents.

The objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.

Changes in surface roughness and color stability of two composites caused by different bleaching agents

The objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.

O objetivo deste estudo foi avaliar o efeito de dois agentes clareadores (peróxido de hidrogênio a 10% e 35%) sobre a estabilidade de cor e rugosidade superficial de dois compósitos, um nanohíbrido e um nanoparticulado. Os espécimes foram polidos, envelhecidos, manchados, clareados e polidos novamente. A ação dos agentes clareadores sobre os compósitos foi analisada em perfilômetro (rugosidade) e um espectrofotômetro (estabilidade de cor). A ação de polimento dos compósitos sobre a rugosidade superficial e a retomada da cor dos compósitos também foi avaliada. Os resultados foram analisados estatisticamente por ANOVA e teste de Tukey (5% de significância). A análise indicou que o compósito nanohíbrido foi mais afetado pelo manchamento. Os agentes clareadores não foram capazes de promover o clareamento dos compósitos ao longo do período de avaliação. O polimento da superfície retornou o compósito nanohíbrido à sua condição de cor original, o que não foi observado para o nanoparticulado. Além disso, o polimento não retornou a rugosidade de superfície dos compósitos para os valores originais. Os autores concluíram que o polimento da superfície após o clareamento não deve ser a opção de tratamento, uma vez que não foi possível inverter a rugosidade dos compósitos à sua rugosidade original, sugerindo que uma degradação mais extensa e irreversível pode ter ocorrido.

An in vitro microleakage evaluation of class V cavities restored with silorane-based resin composite using different adhesive systems / Avaliação in vitro da microinfiltração em cavidades classe V restauradas com compósito a base de silorano utilizando diferentes sistemas adesivos

This study aimed to evaluate the influence of the association of different adhesive systems with a silorane-based resin composite on the microleakage of class V cavities. Fifteen premolars were freshly extracted and randomly divided into three experimental groups, according to the adhesive system used, as follows: P-90: Filtek P-90 adhesive; SE PLUS: Adper SE Bond adhesive; and SBMP: Adper Scotchbond Multi-Purpose adhesive. Class V cavities were constructed on the buccal and lingual surface of each premolar exhibiting enamel margin at the oclusal surface and dentine margin at the cervical surface. The cavities were filled with a silorane-based resin composite (Filtek™ P90 Silorane Low Shrink Restorative, 3M ESPE). After 24 hours of water storage at 37 ºC, the restoration were finished and polished. The teeth were water sealed, immersed in 50% silver nitrate for 24 hours, followed by immersion in a radiographic developing solution for 2 hours. The samples were cut and the degree of dye penetration was assessed with the aid of stereoscopic loupe at x20 magnification, through a 4-point score system (0 to 3).The mean microleakage values were: P-90 = 23.48; SE PLUS = 31.13; and SBMP = 36.90. The results were submitted Kruskal-Wallis and Mann-Whitney tests, showing statistically significant differences among groups (p ≤ 0.05). P-90 showed significant difference when compared to SBMP, exhibiting the smallest scores of dye penetration.The association of different adhesive systems with the silorane-based resin composite (Filtek P-90) influenced on the microleakage degree.

O objetivo deste estudo foi avaliar a influência da associação de diferentes sistemas adesivos a um compósito à base de silorano na microinfiltração de cavidades Classe V. Quinze pré-molares recém-extraídos e divididos aleatoriamente em três grupos experimentais, de acordo com o sistema adesivo empregado, sendo: P-90: Adesivo Filtek P-90; SE PLUS: Adesivo Adper SE Bond; e SBMP: Adesivo Adper Scotchbond Multi-Uso. As cavidades de classe V foram confeccionadas nas faces vestibular e lingual de cada pré-molar com margem oclusal em esmalte e cervical em dentina. As cavidades foram restauradas com um compósito a base de silorano (Filtek™ P90 Silorane Low Shrink Restorative, 3M ESPE). Após 24 horas de armazenamento em água a 37 ºC, as restaurações receberam acabamento e polimento. Os dentes foram impermeabilizados, imersos em nitrato de prata a 50% por 24 horas e, posteriormente, em solução reveladora de radiografias por 2 horas. As amostras foram seccionadas e o grau de penetração do corante foi avaliado por meio de uma lupa estereoscópica com 20 vezes de aumento, utilizando-se um sistema de escores de 0 a 3. Os postos médios foram: P-90 = 23.48; SE PLUS = 31.13; e SBMP = 36.90. Os resultados foram tratados pelos testes de Kruskal-Wallis e Mann-Whitney, que revelaram diferença estatisticamente significante entre os grupos (p ≤ 0,05). P-90 apresentou diferença significante se comparado ao SBMP, exibindo menores escores de penetração do corante. A associação de diferentes sistemas adesivos ao compósito a base de silorano Filtek P-90 influenciou no grau de microinfiltração

Effect of cement type and water storage time on the push-out bond strength of a glass fiber post.

This study investigated the effects of the cement type and the water storage time on the push-out bond strength of a glass fiber post. Glass fiber posts (Fibrekor, Jeneric Pentron) were luted to post spaces using a self-cured resin cement (C&B Cement [CB]), a glass ionomer cement (Ketac Cem [KC]) or a resin-modified glass ionomer cement (GC FujiCEM [FC]) according to the manufacturers' instructions. For each luting agent, the specimens were exposed to one of the following water storage times (n=5): 1 day (T1), 7 days (T7), 90 days (T90) and 180 days (T180). Push-out tests were performed after the storage times. Control specimens were not exposed to water storage, but subjected to the push-out test 10 min after post cementation. Data (in MPa) were analyzed by Kruskal-Wallis and Dunn`s test (α=0.05). Cement type and water storage time had a significant effect (p<0.05) on the push-out bond strength. CB showed significantly higher values of retention (p<0.05) than KC and FC, irrespective of the water storage time. Water storage increased significantly the push-out bond strength in T7 and T90, regardless of the cement type (p<0.05). The results showed that fiber posts luted to post spaces with the self-cured resin cement exhibited the best bonding performance throughout the 180-day water storage period. All cements exhibited a tendency to increase the bond strength after 7 and 90 days of water storage, decreasing thereafter.

Shear bond strength of two adhesive systems bonded to Er:YAG laser-prepared dentin.

Dentinal surfaces prepared with an Er:YAG laser have distinctly different characteristics compared to those prepared with conventional instruments. The objective of this study was to evaluate the shear bond strength of a total-etch adhesive system and a self-etch adhesive system to dentin, prepared conventionally or with an Er:YAG laser. Specimens that were prepared with a diamond bur and treated with the total-etch adhesive showed the highest mean bond strength, followed by specimens prepared with the laser and treated with the total-etch adhesive, specimens prepared with a diamond bur and treated with the self-etch adhesive, and specimens prepared with the laser and treated with the self-etch adhesive, but there were no differences among the groups (P > 0.05). These data indicate that the tested adhesive systems promote similar shear bond strengths, whether the dentin is prepared with a diamond bur or an Er:YAG laser, and that an Er:YAG laser is a suitable cavity preparation method that promotes an adequate surface for a posterior adhesive procedure.

A zircônia na odontologia restauradora / Zirconia in restorative dentistry

A necessidade de melhores propriedades mecânicas dos materiais cerâmicos levou à introdução da zircônia na Odontologia. A zircônia é um polimorfo bem conhecido que existe sob três formas: monoclínica (m), tetragonal (t) e cúbica (c). O notável desempenho da zircônia, já explorado em diversas aplicações médicas e de engenharia, deve-se principalmente à transformação da fase tetragonal metaestável para a fase monoclínica (T → M). O objetivo deste trabalho foi realizar uma revisão da literatura pertinente à zircônia visando um melhor entendimento de sua utilização na Odontologia, bem como descrever um caso clínico realizado com este material.

Fechamento de diastema com coroas de alumina densamente sinterizadas / Diastema closure with densely sintered alumina crowns

O objetivo deste trabalho é apresentar um caso de fechamento de diastema com coroas de alumina densamente sinterizadas através da utilização do Sistema Procera®, mostrando as etapas de confecção e requisitos técnicos para o sucesso dos casos. O caso apresentado seguiu o seguinte protocolo clínico: enceramento diagnóstico, confecção de preparo comtérmino em chanfro e desgaste de 1,5mm nas paredes axiais e 2,0mm de desgaste incisal, confecção de restaurações provisórias, moldagem com técnica de duplo fio de afastamento, enceramento das subestruturas para duplo escaneamento, aplicação cerâmica e cimentação por meio de cimento resinoso. Os resultados obtidos foram julgados como bastante satisfatórios pela paciente e pelo profissional responsável sob os pontos de vista estéticos e biológicos.