The resinous infiltrant lacks remineralizing activity. This research aimed to develop and evaluate bioactivity, physicomechanical properties and penetration of resin infiltrants containing Biosilicate or nanohydroxyapatite. Methods: Experimental resin infiltrant (ERI; 75/25 wt.% TEGDMA/BisEMA) was divided among the groups Pure Experimental (PE); ERI + Biosilicate 5 or 10% (Bio5; Bio10), ERI + 10% nanohydroxyapatite (Hap10), and Icon (DMG, Germany). Bioactivity was analyzed by SEM, EDS and FT-IR/ATR after soaking in SBF. Degree of conversion (DC), sorption and solubility (SO; SOL), flexural strength, modulus of elasticity (FS; E-modulus), contact angle (CA) and penetration were characterized. Extent of penetration was analyzed by treating white spot lesions (WSL) in human dental enamel samples with the infiltrants and subsequently analyzing specimens by confocal laser scanning microscopy. Data from each test were submitted to ANOVA and Tukey's tests (p < 0.01). Results: SEM, EDS and FT-IR showed the formation of precipitates and increase in the rates of Ca and P in the groups with bioactive particles, after storage in SBF. Hap10 showed higher DC and CA values than all the other groups. Groups Bio5 and Bio10 showed CA values similar to those of Icon, higher SO and SOL values, and reduction in other properties. All infiltrants were capable of penetrating into the WSLs. Conclusion:The incorporation of Biosilicate (5 or 10%) or nanohydroxyapatite (10%) into ERI induced mineral deposition on the surface and did not compromise infiltration and penetration into WSLs, however, compromising their physico-mechanical properties.
Background. Post-cured composite resins exhibit improvements in physical and mechanical properties due to additional polymerization conversion. However, the post-curing techniques might influence the color stability of composite resin materials. Thus, this study evaluated the color stability of a nanofilled composite resin (Filtek Z350 XT - 3M ESPE) subjected to different post-curing techniques. Methods. Sixty samples (color A2) were randomly allocated to six experimental groups (n=10): G1: photoactivation (P) (control); G2: P + microwave oven with distilled water; G3: P + microwave oven without distilled water; G4: P + conventional oven; G5: P + dry-heat sterilizer; G6: P + steam autoclave. All the groups were stored in distilled water for 60 days and immersed daily in 5 mL of a coffee solution for 3 minutes. The color readings (CIEL*a*b* system) were performed at two different time intervals, initially and after 60 days, in a reflectance spectrophotometer (UV-2600; Shimadzu). The colorimetric readings were performed using the Color Analysis software (CIEL*a*b* system). Results. Group G6 exhibited significantly low values of total color change (ΔE=13.16). The control (ΔE=15.32) and G5 (ΔE=15.49) groups exhibited intermediate values, with no difference between them. In turn, the groups in which the resin was heated in a microwave (G2 ΔE=18.55 and G3 ΔE=19.45) exhibited the most significant color changes (one-way ANOVA and Tukey test, P≤0.05). Conclusion. Steam autoclave post-polymerization increased the color stability of the nanofilled resin subjected to artificial aging and coffee immersion.
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.
Minimally invasive dentistry is based on conservative techniques for the treatment of initial caries lesions, the so-called white spot lesions. One of the conservative maneuvers includes the use of enamel resin infiltrant: a low viscosity material that penetrates the enamel pores to stop lesion progression. Aim: Therefore, this case report aimed to describe the clinical case of a 28-year-old female patient under routine consultation, in which a radiographic examination showed the presence of two incipient caries lesions in the left upper premolars. Methods: The application of a resin infiltrating agent (Icon®, DMG – Hamburg, Germany) was chosen as treatment to stop caries lesions progression. Conclusion: The use of this conservative technique can be considered a promising approach for the prevention of dental tissue wear, and the resin infiltrant is considered an effective material.
Objective The aim of the study was to evaluate the influence of the incorporation of 10% nano-hydroxyapatite into an experimental resin infiltranton color stability and cross-sectional microhardness.Material and methods 135 blocks were divided into five groups: H: healthy; MB: white spot; I: Icon®; E: experimental; EH: experimental containing 10% nano-hydroxyapatite. For color evaluation (n = 15), CIEL*a*b* values were obtained at the following time points: T0 (before immersion), T1 (14 days after immersion), and T2 (28 days after). Data were applied to CIEDE2000 formula. Cross-sectional microhardness (n = 12) data from the MB, I, E, and EH groups were applied to the mineral loss formula (∆S). Polarized Light Optical Microscopy images were obtained (n = 5) at 40x magnification. Shapiro-Wilk test was used to assess data normality for color stability and mineral loss. One-way ANOVA analysis was performed, followed by Bonferroni's post hoc test (color stability) and Tukey's test (mineral loss).Results In color stability results, regardless of time, there was no significant difference between H and MB groups; at 14 days and at 28 days, MB differed from all infiltrated groups, and H differed from E and EH. For ∆S, MB group showed a significant difference compared to I and EH groups but did not differ from E.Conclusion E and EH showcased similar performance to I regarding color variation. In terms of ∆S, I and EH had less mineral loss, suggesting a reinforcement of the dental structure.Clinical Relevance: Predict color stability and structural reinforcement of resinous infiltrants applied to white spot lesions.
Minimally invasive dentistry has been considered the most suitable method of choice in order to prevent and treat changes in the tooth surface, such as the initial caries lesions, characterized as white spot. This type of conduction aims to maintain the tooth structure, as long as there is no sign of cavitation on the surface. Thus, in 2009 a material was created based on monomers and additives denominated resinous infiltrant, which has the function of paralyzing this white spot lesion acting through diffusion, where the material fills the microporosities. The only material commercially available is Icon®, which, despite having numerous benefits, has some limitations. Some studies with experimental material have been developed in order to try to minimize the limitations of commercial material. Therefore, this literature review aims to address the characteristics, function, application and indications of the material, as well as its limitations.
Dental trauma is one of the most common causes of post-eruptive intrinsic color changes in teeth. The dissatisfaction with smile aesthetics is one of the main motivators for seeking dental procedures such as tooth bleaching, which stands out for being a little-invasive procedure with immediate and satisfactory aesthetic results. The objective of this paper is to describe a case report of a 24-year-old patient who attended the Postgraduate Program in Dental Clinic Practice at the Piracicaba Dental School – University of Campinas, which involved as main complaint tooth darkening after trauma in childhood. Internal bleaching of a dental element was performed using sodium perborate and distilled water associated with in office external bleaching with 37% hydrogen peroxide to provide a more harmonious smile to the patient. The association of bleaching techniques is an alternative widely indicated and effective in cases where it is desirable to maintain the integrity of dental elements, especially in young patients, avoiding more invasive restorative procedures and resulting in patient satisfaction.
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