SUMMARY Objectives: To evaluate how adding different concentrations of particles (barium or zirconium oxide 25%/45% by weight) to a commercial infiltrant (Icon) and an experimental infiltrant influences cohesive strength (CS), degree of conversion (DC), water sorption (WS), solubility (SL), radiopacity, and penetration depth. Methods and Materials: Microtensile CS (n=10) was evaluated using a universal testing machine. DC (n=5) was evaluated in a Fourier-transform infrared spectrometer. Polymerized samples were dissected, weighed, and stored to obtain the final mass for WS and SL tests (n=10). Radiopacity analysis (n=5) was performed using a digital radiography system. Penetration depth analysis (n=5) was performed by confocal laser scanning microscopy. Analyses were performed using the R program, with a significance level of 5%, except for the penetration depth analyses, which were evaluated only qualitatively. Results: The groups with 45% zirconium showed greater CS values, regardless of the infiltrant. Among the groups with no particle addition, those of the experimental infiltrant presented higher DC than those of Icon. The experimental infiltrant presented lower WS than Icon. All groups had SL below the ISO recommended levels. Radiopacity higher than 2.24 mmAl (enamel radiopacity) was observed only in the groups with 45% zirconium. All the groups achieved similar penetration depth, but the groups containing experimental infiltrant appear to have had longer tag extensions. Conclusions: Addition of 45% of zirconium presented good results for CS and WS, as well as SL below the ISO recommended standard, adequate radiopacity, and penetration depth similar to the other groups.

Patient demand looking for the perfect smile has been steadily growing in the last few years. Thus, these two case reports discuss some ultra-conservatives approach to achieve good esthetic results. In the first case the clinical protocol of a restorative approach is described, the cosmetic remodeling of the teeth and in the second case, the replacement of extensive unsatisfactory composite restorations. The treatment planning was based on diagnostic waxing and the making of mock-up in both cases. Teeth bleaching were also performed before restoration. To conclude, these conservative relative therapies with composite resin restorations provide an ultra-minimally invasive protocol with excellent esthetic appearances and fuction, especially for young people. KeywordsDental esthetics; Composite resins; Smiling; Restoration.

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Background: Resinous infiltrating has proven effective in arresting incipient caries lesions. Objective: This study aimed to assess the penetration depth of an experimental resin-infiltrant (75% - TEGDMA, 25% - Bis-EMA, 1% - EDAB, 0.5% camphorquinone), compare it with commercial infiltrant Icon®, and analyze the surface-roughness and microhardness of the resin-materials infiltrated into tooth specimens, before and after pH cycling. Methods: To assess penetration depth, sound third molar specimens were submitted to ten de-remineralization cycles for incipient carious lesion induction and were then randomly divided into 2 groups (n=3): (I) Experimental Infiltrant (EI) and (II) Commercial Infiltrant Icon (CI). After resin infiltration into specimens, qualitative Confocal Fluorescence Microscopy images were captured. For roughness and microhardness assessment, new specimens were demineralized, then randomly divided into two groups (n=20): (I) Experimental Infiltrant (EI) and (II) Commercial Infiltrant Icon (CI) and submitted to roughness and microhardness readouts at the following time-intervals: (T1) sound tooth, (T2) white-spot caries lesion, (T3) resin material that infiltrated, and (T4) resin material that infiltrated and was exposed to pH-cycling. In statistical analyses, generalized linear models of repeated measures in time were applied, with a significance level of 5%. Results: The experimental infiltrant penetrated the carious lesion and exhibited lower roughness values after its application, even after pH cycling, similar to the CI. The microhardness value of the EI group was significantly lower in the last three-time intervals evaluated compared to CI. Conclusion: Experimental resin infiltrant was efficient in penetrating white spot lesions and reducing surface roughness; however, it did not increase surface microhardness.

Objetivo: avaliar clinicamente a utilização de dentifrício dessensibilizante, aplicado através de moldeira plástica, na redução da dor e variação de cor causadas pela técnica de clareamento dental de consultório. Material e Métodos: Para o estudo foram selecionados 24 voluntários que foram submetidos ao clareamento dental de consultório em 3 sessões clínicas com intervalo de uma semana, com a utilização de gel clareador (peróxido de hidrogênio - 35%). Na noite referente a cada sessão de clareamento, os voluntários utilizaram uma moldeira plástica por 4 horas contendo um dos dentifrícios relativos aos grupos experimentais: (1) Sucralose (S); (2) Fosfato de sódio (FS) e Silicato de cálcio (SC) (Tecnologia NR-5). A dor foi avaliada antes do uso da moldeira plástica com dentifrício (S1, S3, S5) e após (S2, S4, S6) durante 4 semanas, utilizando a escala numérica analógica com escores de 0 a 10. Para a variação de cor (?E) utilizou-se espectrofotômetro (Easyshade). Resultados: O grupo FS e SC apresentaram redução da dor em relação aos demais grupos (p<0,05). Houve uma redução da dor após o uso da moldeira com dentifrício (S2, S4, S6) por 4h e não houve diferença para ?E entre os grupos experimentais após o tratamento clareador (p=0,91). Conclusão: Conclui-se que a utilização de dentifrício dessensibilizante com FS e SC (Tecnologia NR-5) em moldeira plástica foi eficiente para a redução da dor causada por clareamento dental de consultório e o uso de dentifrício dessensibilizante não influenciou a eficácia do tratamento clareador.