In conclusion, major components of CNSL yield overall best dentin biomodification outcomes when applied for one minute without staining the dentin collagen.

The aim was to assess dentin adhesion and physicochemical properties of experimental etch-and-rinse and self-etch adhesives doped with epigallocatechin-3-gallate (EGCG), a well-known collagen crosslinker obtained from green tea (Camellia sinensis). Experimental adhesives were prepared without (0 wt%), with 0.1 or 0.5 wt% EGCG addition. Their degree of conversion was surveyed by FTIR, and bar-shaped specimens were tested to obtain flexural strength and modulus initially and after 1-week ethanol storage. Extracted human molars were prepared, bonded, and cut into resin-dentin sticks for microtensile bond strength test, which was conducted after 24 h or 6-month water storage. Statistical analyses were performed with two-way ANOVA and Tukey's test (p < 0.05). Degree of conversion outcomes depicted a significant polymerization reduction by the addition of EGCG in self-etch adhesive in both concentrations. However, only 0.1% reduced the conversion of etch-and-rinse adhesive. Flexural modulus and strength were significantly diminished (p < 0.05) by the addition of both concentrations of EGCG for the two model adhesives. Dentin-bond strength was reduced after aging with the addition of EGCG to self-etch adhesive. Nevertheless, 0.5% EGCG increased the bond strength of etch-and-rinse adhesive after aging, conversely to the significant reduction for EGCG-free control adhesive. In conclusion, EGCG at 0.5% provides optimal improvements on dentin bonding without altering final polymerization of a model etch-and-rinse adhesive.

Objective: The aim of this study was to analyze the in vitro effect of White Wine Vinegar (WWV) on surface properties of removable partial dentures' (RPD) components. Methods: Thirty specimens of one artificial teeth and a slab of cobalt-chromium alloy for RPDs were prepared. Specimens were distributed randomly in 3 groups (n=10): distilled water (negative control), WWV and CoregaTabs® (commercial control). Before and after immersion regimens, the analyses undertaken were colour stability assessed using spectrophotometer, mean roughness surveyed by perfilometry, mass variation using an analytical balance and surface composition assessed by Raman micro-spectroscopy. The data were statistically analyzed by repeated-measures ANOVA and Tukey test (p<0.05). Results: No statistically significant differences were observed between the treatments on roughness and colour change. Distilled water increased the weight of specimens whilst CoregaTabs and WWV reduced significantly the mass (p<0.05). In the Raman analysis, reduction of Co-Cr peak at 470 cm -1 was detected after immersion in distilled water and CoregaTabs, demonstrating signs of alloy degradation. Peak at 2430 cm -1 after immersion in distilled water was observed. Conclusion: WWV at 30 vol % is a promising low-cost alternative for the daily cleaning of removable dentures without altering surface properties and composition of removable partial denture components.

No abstract

Photo disinfection of deep dentin caries lesions may be a useful tool for preserving tooth struc ture. However, increase of pulpal temperature higher than 5.5°C may put pulp vitality in danger. Objectives: This in vitro study evaluated thermal effects of radiation of the red spectrum (λ = 600-700 nm, 94 J cm-2) on pulpal and periodontal areas when irradiating deep dentin cavities in human teeth. Methods: Tooth prep aration was performed at occlusal surface in 10 human teeth, which were irradiated by five different light units, four diode GaAlAs lasers: Coherent (C); Kondortech (B); Whitening lase (W); and K5000 with 2 dif ferent tips (K1 and K2), as well as one light emitting diode Laserbeam (LED). After application of toluidine blue O dye in the cavity, variation of temperature was measured in duplicate using a digital thermometer and 2 K type thermocouples one placed inside the pulpal chamber and the other on root surface at the cemen toenamel junction, simultaneously. The mean average temperature rise (ΔT) was calculated for each group. Results: ΔT values were analyzed by ANOVA and Tukey tests. Pulpal temperature increase ranged from 0.62 ± 0.51 to 1.25 ± 0.50°C. Group C presented the highest ΔT, which was statistically significant different from B, K1, and K2. The lowest ΔT value was found for group K2, which statistically differed from the group W. No other statistically significant difference was found. At the root surface, ΔT values were lower than 0.5°C for all devices and no statistically significantly difference was found among them. Conclusion: With regard to thermal side effects, the use of these red light sources operating at 94 J cm-2 may be considered harmless for dental tissues.