Abstract Objective To evaluate the protective effect of an experimental solution containing TiF4/NaF on the development of radiation-induced dentin caries lesions. Methodology bovine root samples were irradiated (70Gy) and distributed as following (n=12/group): Commercial Saliva (BioXtra), NaF (500 ppm F-), TiF4 (500 ppm F), TiF4/NaF (TiF4: 300 ppm F-, NaF: 190 ppm F-), and Phosphate buffer solution (PBS, negative control). Biofilm was produced using biofilm from irradiated patients and McBain saliva (0.2% of sucrose, at 37oC and 5% CO2) for five days. The treatments were applied 1x/day. Colony-forming units (CFU) were counted and demineralization was quantified by transversal microradiography. The ANOVA/Tukey test was applied for all parameters. Results All treatments reduced CFU for total microorganisms. TiF4 reduced Lactobacillus sp. (7.04±0.26 log10 CFU/mL) and mutans streptococci (7.18±0.28) CFU the most, when compared to PBS (7.58±0.21 and 7.75±0.17) and followed by NaF (7.12±0.31 and 7.34±0.22) and TiF4/NaF (7.16±0.35 and 7.29± 0.29). TiF4 and Commercial saliva showed the lowest integrated mineral loss (ΔZ-vol%.mm) (1977±150 and 2062±243, respectively) when compared to PBS (4540±335), followed by NaF (2403±235) and TiF4/NaF (2340±200). Commercial saliva was the only to significantly reduce mineral loss (LD-µm) (111±25) compared to PBS (153±24).Mean mineral loss (R-vol%) decreased by 35.2% for TiF4 (18.2±3.3) when compared to PBS (28.1±2.9) Conclusion: TiF4/NaF has a comparable anti-cariogenic effect to TiF4 and Commercial saliva under the model in this study. TiF4NaF TiFNaF TiF radiationinduced radiation induced lesions 70Gy Gy (70Gy n=12/group n12group ngroup n 12 group (n=12/group) BioXtra, BioXtra , (BioXtra) 500 (50 F, F F-) F) (TiF4 30 F- 19 PBS, (PBS control. control . control) 0.2% 02 0 2 (0.2 sucrose oC 5 CO2 CO days 1xday xday 1x day x 1x/day Colonyforming Colony forming (CFU microradiography ANOVATukey ANOVA Tukey parameters microorganisms sp 7.04±0.26 704026 7 04 26 (7.04±0.2 log log1 CFU/mL CFUmL mL 7.18±0.28 718028 18 28 (7.18±0.28 most 7.58±0.21 758021 58 21 (7.58±0.2 7.75±0.17 775017 75 17 7.12±0.31 712031 31 (7.12±0.3 7.34±0.22 734022 34 22 7.16±0.35 716035 16 35 (7.16±0.3 729 29 7.29 0.29. 029 0.29 0.29) ΔZvol%.mm ΔZvolmm ΔZ vol%.mm vol mm (ΔZ-vol%.mm 1977±150 1977150 1977 150 (1977±15 2062243 2062 243 2062±243 respectively 4540±335, 4540335 4540±335 4540 335 (4540±335) 2403±235 2403235 2403 235 (2403±235 2340±200. 2340200 2340±200 2340 200 (2340±200) LDµm LD µm (LD-µm 111±25 11125 111 25 (111±25 153±24.Mean 15324Mean Mean 153±24 .Mean 153 24 Rvol% Rvol R vol% (R-vol% 352 35.2 18.2±3.3 18233 3 (18.2±3.3 28.1±2.9 28129 1 9 (28.1±2.9 Conclusion anticariogenic anti cariogenic study (n=12/group (BioXtra 50 (5 (TiF 0.2 (0. 7.04±0.2 70402 (7.04±0. 7.18±0.2 71802 (7.18±0.2 7.58±0.2 75802 (7.58±0. 7.75±0.1 77501 7.12±0.3 71203 (7.12±0. 7.34±0.2 73402 7.16±0.3 71603 (7.16±0. 72 7.2 ΔZvol volmm 1977±15 197715 197 15 (1977±1 206224 206 2062±24 454033 4540±33 454 33 (4540±335 2403±23 240323 240 23 (2403±23 234020 2340±20 234 20 (2340±200 111±2 1112 11 (111±2 15324 153±2 (R-vol 35. 18.2±3. 1823 (18.2±3. 28.1±2. 2812 (28.1±2. ( 0. (0 7.04±0. 7040 (7.04±0 7.18±0. 7180 (7.18±0. 7.58±0. 7580 (7.58±0 7.75±0. 7750 7.12±0. 7120 (7.12±0 7.34±0. 7340 7.16±0. 7160 (7.16±0 7. 1977±1 19771 (1977± 20622 2062±2 45403 4540±3 45 (4540±33 2403±2 24032 (2403±2 23402 2340±2 (2340±20 111± (111± 1532 153± 18.2±3 182 (18.2±3 28.1±2 281 (28.1±2 7.04±0 704 (7.04± 7.18±0 718 (7.18±0 7.58±0 758 (7.58± 7.75±0 775 7.12±0 712 (7.12± 7.34±0 734 7.16±0 716 (7.16± 1977± (1977 2062± 4540± 4 (4540±3 2403± (2403± 2340± (2340±2 (111 18.2± (18.2± 28.1± (28.1± 7.04± 70 (7.04 7.18± 71 (7.18± 7.58± (7.58 7.75± 77 7.12± (7.12 7.34± 73 7.16± (7.16 (197 (4540± (2403 (2340± (11 18.2 (18.2 28.1 (28.1 7.04 (7.0 7.18 (7.18 7.58 (7.5 7.75 7.12 (7.1 7.34 7.16 (19 (4540 (240 (2340 (1 18. (18. 28. (28. 7.0 (7. 7.1 7.5 7.7 7.3 (454 (24 (234 (18 (28 (7 (45 (2 (23 (4

Abstract: This randomized three-armed controlled clinical trial compared the effect of titanium tetrafluoride (TiF4) and sodium fluoride (NaF) varnishes on caries control in smooth surfaces of permanent dentition and children's acceptability. Sixty children (6-8 y/o) were randomly divided into TiF4 (2.45% F–), NaF (2.26% F–) or placebo (control) groups. Varnishes were applied on permanent teeth once a week for the first 4 weeks and after the 6th and 12th months of the study. The variables were as follows: International Caries Detection and Assessment System (ICDAS) scores, quantitative fluorescence changes, visual plaque index (VPI) and degree of acceptability. Two-way RM-ANOVA, ANOVA/Tukey and χ2 tests were performed (p < 0.05). No differences were found between the treatments with respect to ICDAS scores (p = 0.32). Only TiF4 reduced the mean fluorescence loss significantly at 18 months compared to the baseline (p = 0.003). TiF4 showed a lower percentage of new caries lesions by tooth surface than the placebo, while NaF did not induce such a change (p < 0.014). Regardless of the treatment, more than 95% of the participants reported being satisfied. For all groups, the VPI decreased significantly at 3 months compared to the baseline value (p < 0.001), with no differences between the treatments (p = 0.17). TiF4 had a similar ability to control caries lesions as NaF; however, only TiF4 differed from the placebo (p = 0.004). The acceptability of TiF4 varnish was similar to that of NaF varnish.

Abstract The increased consumption of citrus sweets can contribute to the development of erosive tooth wear (ETW). Objective This in vitro study evaluated the erosive potential of citrus sweets on bovine enamel samples regarding the quantification of wear. Methodology Ninety bovine crowns were prepared and samples were randomly distributed into 6 groups (n=15): 0.1% citric acid solution (pH 2.5); Coca-Cola ® Soft Drink (pH 2.6); Fini ® Diet (lactic and citric acid, pH 3.3); Fini ® Jelly Kisses (lactic and citric acid, pH 3.5); Fini ® Fruit Salad Bubblegum (maleic acid, pH 2.6); Fini ® Regaliz Acid Tubes (maleic and citric acid, pH 3.1). Sweets were dissolved in the proportion of 40 g/250 mL of deionized water. Enamel samples were submitted to erosive challenges for 7 days (4 daily acid immersion cycles for 90 s each). Enamel wear was measured using contact profilometry (μm), and data (median values [interquartile range]) were submitted to Kruskal-Wallis/Dunn’s test (p<0.0001). Results All citrus sweets tested present a high erosive potential, Fini Diet ® (2.4 [1.2]) and Fini Regaliz Tubs ® (2.2 [0.5]) show the highest erosive potential, similar to 0.1% citric acid (2.3 [0.7]); Fini Regaliz Tubs ® is more erosive than Coca-Cola ® (1.4 [0.9]). Conclusion The evaluated citrus sweets have great erosive potential and play a key role in the development of ETW.

Resumo A ocorrência de lesões de cárie adjacentes a restaurações é um sério problema na Odontologia. Portanto, novos materiais restauradores antimicrobianos poderiam ajudar a prevenir as lesões cariosas recorrentes. Este estudo avaliou o efeito de um novo cimento de ionômero de vidro (Ion Z) sobre a viabilidade de um biofilme microcosmo e o desenvolvimento da desmineralização do esmalte. Amostras de esmalte foram restauradas com os seguintes materiais (n=9): A) Ion-Z (FGM Ltda); B) Maxxion R (FGM Ltda); C) Ketac Fil Plus (3M ESPE) e D) sem restauração (controle). As amostras foram submetidas a uma mistura de saliva humana com saliva de McBain (1:50) contendo sacarose a 0,2% por 14 dias. As bactérias vivas e mortas foram quantificadas por fluorescência usando um microscópio confocal de varredura à laser. A desmineralização do esmalte foi analisada usando microradiografia transversal (TMR). Os dados foram submetidos aos testes ANOVA/Tukey ou Kruskal-Wallis/Dunn (p<0,05). O Ion Z induziu uma porcentagem mais elevada de bactérias mortas (60,96 ± 12,0%) comparado aos outros grupos (Maxxion R: 39,8 ± 6,7%, Ketac Fil Plus: 43,7 ± 9,71% e controle 46,3 ± 9,5%). Todos os materiais reduziram significativamente a perda mineral média em relação ao controle (Ion-Z 25,0 ± 4,2% vol, Maxxion R 23,4 ± 8,0% vol, Ketac Fil Plus 30,7 ± 7,7% vol e controle 41,2 ± 6,6% vol). O Ion-Z foi o único material capaz de melhorar significativamente o conteúdo mineral na camada superficial (Zmax: 63,5 ± 18,2% vol) em comparação com o controle (38,9 ± 11,3% vol). Ion-Z mostrou potencial antimicrobiano, mas seu efeito anti-cárie foi semelhante aos outros materiais, sob este modelo.

Abstract The occurrence of caries lesions adjacent to restorations is a serious problem in Dentistry. Therefore, new antimicrobial restorative materials could help to prevent recurrent carious lesions. This study evaluated the effect of a new glass ionomer cement (Ion Z) on the viability of a microcosm biofilm and on the development of enamel demineralization. Enamel samples were filled with the following materials (n=9): A) Ion-Z (FGM Ltda); B) Maxxion R (FGM Ltda); C) Ketac Fil Plus (3M ESPE) and D) no restoration (control). The samples were then exposed to human saliva mixed with McBain saliva (1:50) containing 0.2% sucrose for 14 days. The live and dead bacteria were quantified by fluorescence using a confocal laser-scanning microscope. The enamel demineralization was analyzed using transverse microradiography (TMR). The data were submitted to ANOVA/Tukey or Kruskal-Wallis/Dunn test (p<0.05). Ion Z induced a higher percentage of dead bacteria (60.96±12.0%) compared to the other groups (Maxxion R: 39.8±6.7%, Ketac Fil Plus: 43.7±9.71% and control 46.3±9.5%). All materials significantly reduced the average mineral loss compared to control (Ion-Z 25.0±4.2%vol, Maxxion R 23.4±8.0%vol, Ketac Fil Plus 30.7±7.7 and control 41.2±6.6%vol). Ion-Z was the only material able to significantly improve the mineral content at the surface layer (Zmax: 63.5±18.2%vol) compared to control (38.9±11.3%vol). Ion-Z shows antimicrobial potential, but its anti-caries effect was similar to the other materials, under this model.

Abstract Titanium tetrafluoride (TiF4) is known for interacting with enamel reducing demineralization. However, no information is available about its potential antimicrobial effect. Objectives This study evaluated the antimicrobial and anti-caries potential of TiF4 varnish compared to NaF varnish, chlorhexidine gel (positive control), placebo varnish and untreated (negative controls) using a dental microcosm biofilm model. Material and Methods A microcosm biofilm was produced on bovine enamel previously treated with the varnishes, using inoculum from human saliva mixed with McBain saliva, under 0.2% sucrose exposure, for 14 days. All experiments were performed in biological triplicate (n=4/group in each experiment). Factors evaluated were: bacterial viability (% dead and live bacteria); CFU counting (log10 CFU/mL); and enamel demineralization (transverse microradiography – TMR). Data were analysed using ANOVA/Tukey's test or Kruskal-Wallis/Dunn's test (p<0.05). Results Only chlorhexidine significantly increased the number of dead bacteria (68.8±13.1% dead bacteria) compared to untreated control (48.9±16.1% dead bacteria). No treatment reduced the CFU counting (total microorganism and total streptococci) compared to the negative controls. Only TiF4 was able to reduce enamel demineralization (ΔZ 1110.7±803.2 vol% μm) compared to both negative controls (untreated: ΔZ 4455.3±1176.4 vol% μm). Conclusions TiF4 varnish has no relevant antimicrobial effect. Nevertheless, TiF4 varnish was effective in reducing enamel demineralization under this model.

Fluoride varnishes play an important role in the prevention of dental caries, promoting the inhibition of demineralization and the increase of remineralization. Objective: This study aimed to analyze the amount of fluoride released into water and artificial saliva from experimental TiF4 and NaF varnishes, with different concentrations, for 12 h. Material and Methods: Fluoride varnishes were applied on acrylic blocks and then immersed in 10 ml of deionized water and artificial saliva in polystyrene bottles. The acrylic blocks were divided in seven groups (n=10): 1.55% TiF4 varnish (0.95% F, pH 1.0); 3.10% TiF4 varnish (1.90% F, pH 1.0); 3.10% and 4% TiF4 varnish (2.45% F, pH 1.0); 2.10% NaF varnish (0.95% F, pH 5.0); 4.20% NaF varnish (1.90% F, pH 5.0); 5.42% NaF varnish (2.45% F, pH 5.0) and control (no treatment, n=5). The fluoride release was analyzed after 1/2, 1, 3, 6, 9 and 12 h of exposure. The analysis was performed using an ion-specific electrode coupled to a potentiometer. Two-way ANOVA and Bonferroni's test were applied for the statistical analysis (p<0.05). Results: TiF4 varnishes released larger amounts of fluoride than NaF varnishes during the first 1/2 h, regardless of their concentration; 4% TiF4 varnish released more fluoride than NaF varnishes for the first 6 h. The peak of fluoride release occurred at 3 h. There was a better dose-response relationship among the varnishes exposed to water than to artificial saliva. Conclusions: The 3.10% and 4% TiF4 -based varnishes have greater ability to release fluoride into water and artificial saliva compared to NaF varnish; however, more studies must be conducted to elucidate the mechanism of action of TiF4 varnish on tooth surface.