The aim of this in vitro study was to evaluate the effect of different mouthwashes on superficial roughness and Knoop hardness of two resin composites. Eighty specimens (6 mm Ø and 2 mm height) were prepared and divided into eight experimental groups (n = 10) according to the resin composites (4 Seasons and Esthet X), and storage solutions (G1 - Distilled water; G2 - Colgate Plax Overnight; G3 - Colgate Plax Alcohol Free; and G4 - Colgate Plax Whitening). The initial hardness and roughness readings (T1) were measured and then the specimens were stored in 2 mL of mouthwash for 12 h (T2) and 24 h (T3). The data were analyzed with repeat-measures two-way ANOVA and Tukey's test (α = 5%). Regardless of the type of solution and time of exposure, there was no statistical difference for roughness between the resins (p = 0.44). G4 and G8 presented higher roughness means than G1, G3, G5 and G7, after 12 and 24 hours of immersion. For Knoop microhardness analysis, there was a significant reduction for all groups after 12 hours and 24 hours. We conclude that the mouthwashes containing hydrogen peroxide and/or alcohol decrease the microhardness of the resins tested; however, the mouthwash containing hydrogen peroxide had a higher deleterious effect on roughness.

AIM: This study aimed to evaluate the enamel microhardness, surface roughness, and chemical composition after microabrasion technique, followed by polishing and different immersion times in artificial saliva. MATERIALS AND METHODS: Ninety enamel blocks (25 mm2) from bovine incisors were divided into two groups (G1 and G2), and then subdivided in five subgroups (n = 9) according to their microabrasion treatment and polishing with a diamond paste: 35% phosphoric acid and pumice (H3PO4+Pum) and polishing; just H3PO4+Pum; 6.6% hydrochloric acid and silica (HCl+Sil) and polishing; just HCl+Sil; and control (no treatment). For G1, roughness and microhardness analyses were performed before (L1) and after (L2) microabrasion. After 15 (L3) and 30 (L4) days of immersion in artificial saliva, microhardness analysis was also performed. After (L4) analysis, the specimens were subjected to SEM analysis. G2 was used for the chemical analysis using energy dispersion testing (EDS). The data was subjected to statistical analysis (α = 5%). For roughness, L2 presented higher values than L1, except for the polished groups. For microhardness, L2 presented higher values than L1, except for unpolished groups. The L3 and L4 did not differ and were higher than L1. RESULTS: No changes were observed in the phosphorus concentrations of the microabrasioned enamel. However, the specimens treated with HCl+Sil were observed as having decreased calcium and increased chlorine and silica on the EDS test. CONCLUSION: Microabrasion followed by polishing and immersion in artificial saliva for 15 days is enough to increase the microhardness of microabrasioned enamel surfaces, although the microabrasion procedure can alter the mineral content of the enamel.

Introduction: Composite resins are an extensively used esthetic material that has excellent adaptation, reproduces the characteristics of the tooth structure and is suitable for the conditions of the oral environment. However, this material is also very susceptible to staining due to pigmentation coming from the diet and habits of the patient. Objectives: To evaluate the staining of two brands of composite resin, one nanoparticle and a nanohybrid type (Filtek Z350XT® and IPS Empress Direct®), in direct contact with the acid pH of beverages. Methods: In total 40 specimens were made, 20 of each type of resin studied. After being inserted into a Teflon matrix and light activated, the samples were removed, stored in containers with 2 ml of artificial saliva and kept in the refrigerator. Every day 20 of these samples were placed in direct contact with 2 ml Gatorade, and the other 20 samples, in 2 ml of wine, each set for 30 minutes. After 30 minutes, the acid pH substances were removed, and 2 ml of artificial saliva was again placed in the container. This process was repeated every day for 10 days. Results: The results showed that the nanoparticle resin (Filtek Z350XT) was more susceptible to staining than the nanohybrid type (Empress Direct®) when in contact with the wine. When wine and Gatorade were compared, the solution with higher staining capacity was shown to be wine. Conclusion: The two resins tested were susceptible to staining in a 10-day period. Mottling and more staining was visibly detected after samples were immersed in the solution with the higher pH, and nanoparticulate resin was more susceptible to staining.

The facets and ceramic laminates are urgent for aesthetic recovery of the smile. When compared to direct directions with composite composition, they may be safer and predictable, provided the body is selected and selected, have a mastery of the materials and techniques involved. A career adhesive, the use in type of transmission, is a phase of critical, critical years, which should follow to follow the extortion of adherence and aesthetic species. Thus, after preparation, it is essential that the factor control be based on an adequate diet, with the aim of improving its capacity, with a minimum of aesthetic commitment. The use of resinous resources should be made as aesthetic and flexible particles. Thus, cementation-related parameters are important in determining the success and longevity of laminates, but should also be performed for case selection, adequate tooth preparation, and periodic maintenance.

Introduction:The color matching between aesthetic materials and dental structure is certainly the parameter most used by patients to evaluate the quality of the aesthetic treatments performed, influencing decisively the judgment of professional competence and the degree of patient satisfaction at the end of the treatment.Objective: To identify among the composite resins, which present greater color matching with the Vita Classical scale.Method: Six groups were formed; the Tetric N-Flow® color A1 resin was used as light control and the Tetric N-Flow® A4 color as dark control and 4 A2D color resins (Oplais, Empress Direct, Esthelite and Z350). For each material, ten specimens were prepared. The reading of each test specimen was performed through a spectrophotometer and then annotated the CIELab standard, in addition to reading through the hue and chroma. A visual evaluation was performed between 4 evaluators so that they could check the resins against the light and dark patterns. Results:The tonality of each specimen presented a low percentage of correspondence, in relation to the A2 color of the Vita scale. The ΔE values of the groups and the A2 range of the Vita scale were submitted to statistical analysis with 5% significance. ANOVA resulted in statistically significant differences for all sample groups (p <0.05). The Tukey test showed no color match between the analyzed materials and the reference hue of the Vita scale. Conclusion:there was no color match with the reference A2 of the Vita scale; the differences of composition and manufacturers result in colors that are close but different.