Influence of bioactive particles on the chemical-mechanical properties of experimental enamel resin infiltrants

Sfalcin, Ravana Angelini; Correr, Américo Bortolazzo; Morbidelli, Lucas Rafael; Araújo, Tatiany Gabrielle Freire; Feitosa, Victor Pinheiro; Correr-Sobrinho, Lourenço; Watson, Timothy F.; Sauro, Salvatore

doi:10.1007/s00784-016-2005-y

Cited by 29 publications

(18 citation statements)

References 74 publications

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“…Considering the phenomenon of polymerization inhibition reported in this study, as well as in previous studies 10–12 , it should be noted that there are also reports of various types of BG being successfully incorporated into methacrylate resins with no negative effect on the DC 3,36,44 . These studies have investigated various experimental materials, including Bis-GMA/TEGDMA resin filled with bismuth-oxide-modified BG 3 , Bis-EMA/TEGDMA resin filled with zinc-polycarboxylated BG and BG 45S5 36 , and commercial adhesive systems doped with niobium phosphate-modified BG 44 . The fact that the effect of BG on polymerization apparently varies with the compositions of BG, inert fillers, and resin systems indicates the need for further investigations.…”

Section: Discussionsupporting

confidence: 79%

“…The potential of unsilanized fillers for the inhibition of polymerization mediated by free radicals has been known for at least four decades 23,25 . Several studies published by different research groups have implied that unsilanized BG fillers can impair the DC of methacrylate resins 10,36,37 . Also, a series of studies performed on the experimental BG-containing composites similar to those based on the Bis-GMA resin system in the present study has indicated that unsilanized BG fillers can diminish the DC in a dose-dependent manner 10–12 .…”

Section: Discussionmentioning

confidence: 99%

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Degree of conversion of experimental resin composites containing bioactive glass 45S5: the effect of post-cure heating

Par

Spanovic²,

Tauböck

et al. 2019

Sci Rep

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Resin composites containing reinforcing inert glass fillers combined with bioactive glass (BG) can aid in the prevention of secondary caries, which is a major cause of failure of contemporary composite restorations. A series of previous studies on experimental resin composites filled with BG 45S5 has demonstrated that methacrylate resin polymerization can be impaired by the addition of unsilanized BG, leading to lower degrees of conversion (DC). In order to distinguish whether the polymerization inhibition is caused by a direct (temperature-independent) effect of BG or an indirect (temperature-dependent) effect of restricted mobility of reactive species, this study used Raman spectroscopy to evaluate the DC values of experimental composites post-cured at 37 °C and 150 °C. The potential of BG to adversely affect DC was highly dependent on the resin system. The highest DC reduction was observed in the resin system based on ethoxylated bisphenol A dimethacrylate (Bis-EMA), followed by bisphenol A glycidyl methacrylate (Bis-GMA). In contrast, the DC for urethane dimethacrylate (UDMA) was not compromised by BG. Increasing the mobility of reactive species by heating at 150 °C showed limited potential for increasing the DC in the Bis-EMA and Bis-GMA resin systems, indicating a direct inhibitory effect of BG on polymerization.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Degree of conversion of experimental resin composites containing bioactive glass 45S5: the effect of post-cure heating

Par

Spanovic²,

Tauböck

et al. 2019

Sci Rep

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“…The value found for the Icon DC was close to the values found in other studies, that is, from 50-56% DC. 25,26 By comparing the results obtained using the commercial materials with the supposedly experimental analog (100% TEGDMA)-showing just 32.7% of DC under the same test conditions-it is clear that the remaining experimental groups can be compared only with the experimental control. As expected, raising the temperature led to improved DC, owing to increased molecular mobility and decreased viscosity of the system.…”

Section: Discussionmentioning

confidence: 99%

Can composition and preheating improve infiltrant characteristics and penetrability in demineralized enamel?

et al. 2020

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The composition of infiltrants can influence their physical properties, viscosity and depth of penetration (DP). Strategies are used to increase the DP, such as the addition of diluents or the use of heat. This study aimed to evaluate the effect of preheating and composition on physical properties and DP of infiltrants in demineralized enamel. The groups were assigned, and the following experimental formulations were made: 25%BisEMA +75%TEGDMA; 25%BisEMA +65%TEGDMA +10%ethanol; 25%BisEMA +65%TEGDMA +10%HEMA; 100%TEGDMA; 90%TEGDMA +10%ethanol; 90%TEGDMA +10%HEMA. The samples were photoactivated at two temperatures (25°C and 55°C). Degree of conversion (DC) was performed using an infrared spectrophotometer. Elastic modulus (E), flexural strength (FS) and contact angle (CA) tests were also performed. The DP of an infiltrant in demineralized enamel was determined by confocal laser scanning microscopy (CLSM) using an indirect labeling technique. The data were analyzed by two-way ANOVA and Tukey's test. DC increased after preheating in all the groups; however, 90%TEGDMA+10%ethanol showed the lowest DC for both temperatures, and the lowest E. Preheating did not influence E or FS. The CA increased at 55°C for most groups, but decreased for groups containing HEMA. Temperature did not seem to influence DP, and Icon showed the lowest DP values. The 100%TEGDMA composition showed more homogeneous penetration, whereas Icon showed heterogeneous and superficial penetration. The preheating technique does not improve all properties in all the material compositions. The composition of a material can influence and improve its properties.

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“…When compared to traditional enamel repair methods, our enamel repair with amorphous ceramics is outstanding (Figure i). Both the Young's modulus and hardness of E‐Amorphous ZrO 2 surpassed the values of enamel repaired by remineralization and with a composite resin, which showed a similar behavior to the E‐Sound samples (Figure i). To the best of our knowledge, the adoption of amorphous ZrO 2 in the fields of enamel repair has not been previously reported, and our enamel repair approach has been proven advantages, indicating great potential for future clinical applications.…”

mentioning

confidence: 66%

Enamel Repair with Amorphous Ceramics

et al. 2020

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Developing high‐performance materials in physiological conditions to clinically repair stiff tissue for long lifespan remains a great challenge. Here, an enamel repair strategy is reported by efficiently growing a biocompatible ZrO2 ceramic layer on defective enamel through controllable hydrolysis of Zr4+ in oral‐tolerable conditions. Detailed analysis of the grown layer indicates that the grown ZrO2 ceramic is amorphous without grain boundary and dislocation, which endows the repaired enamel with natural enamel comparable mechanical performance (modulus ≈82.5 GPa and hardness ≈5.2 GPa). Besides, the strong chemical connection between unsaturated coordinated Zr4+ in amorphous structure and PO43− greatly strengthen the crystalline–amorphous interface of the repaired enamel to endure the long‐time mastication damage. Moreover, these ZrO2 ceramics provide hydrophilic, electronegative, and smooth surfaces to resist the adhesion and proliferation of cariogenic bacteria. The hybrid amorphous–crystalline interface design with advantages in biomechanical compatibility would promote the evolution of a variety of cutting‐edge functional materials for medical and engineering application.

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Influence of bioactive particles on the chemical-mechanical properties of experimental enamel resin infiltrants

Abstract: Resin infiltrants doped with bioactive particles may improve the long-term performance of the treatment of white-spot lesions.

Cited by 29 publications

References 74 publications

Degree of conversion of experimental resin composites containing bioactive glass 45S5: the effect of post-cure heating

Degree of conversion of experimental resin composites containing bioactive glass 45S5: the effect of post-cure heating

Can composition and preheating improve infiltrant characteristics and penetrability in demineralized enamel?

Enamel Repair with Amorphous Ceramics

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