Navegando por Assunto "Dentina"

Agora exibindo 1 - 4 de 4

Efeito anti-erosivo de géis experimentais a base de própolis sobre lesões iniciais em dentina cervical radicular bovina
(Centro Universitário do Estado do Pará, 2024-09-24) Ribeiro, Breno Bevilaqua e Silva; Carneiro, Paula Mendes Acatauassú; http://lattes.cnpq.br/7375951134055063; Alencar, Cristiane de Melo; http://lattes.cnpq.br/4783175034033264; Araújo, Jesuina Lamartine Nogueira; http://lattes.cnpq.br/4860837494466416; Oliveira, Roberta Pimentel de; http://lattes.cnpq.br/6689993037436832
Objective: The aim of this study was to evaluate the preventive potential of na experimental propolis-based gels on the inorganic structure of initial dentin erosion lesions. Materials and Methods: Forty bovine cervical dentin samples (4x4x2 mm) were obtained and pre-eroded in a 1% citric acid solution, pH 2.0, for 10 minutes. The samples were then randomized into four groups based on the anti-erosive treatment: G1 – experimental gel without active component; G2 – experimental gel with 0.5% propolis; G3 – experimental gel with 1% propolis; G4 – Ultra EZ desensitizing gel (Ultradent, Indaiatuba, SP, Brazil). Erosion cycling and treatment were performed for 3 days. After cycling, the samples were subjected to 3D profilometry testing to map the surface topography and measure the tooth structure loss (TSL). Scanning electron microscopy (SEM) was then performed for qualitative analysis to assess the surface morphology of the specimens. The One-way ANOVA test, followed by the Tukey post-test, was used to analyze the data. Results: The lowest roughness values were observed in the experimental group G3 (p < 0.05). Additionally, TSL was significantly lower in group G3 compared to the other groups (p < 0.05). The experimental groups G2 and G3 showed obliteration of dentinal tubules. Furthermore, in G3, a high coverage of precipitates on the surface of the samples was observed. Conclusion: Thus, the experimental propolis-based gel at 1% showed promising performance on initial dentin erosion lesions.
Extrato antioxidante natural do cacau (Theobroma cacao L.) em diferentes veículos reduz a erosão dentinária in vitro?
(Centro Universitário do Estado do Pará, 2025-06-05) Bentes, Maria Eduarda Martins; Alencar, Cristiane de Melo; https://lattes.cnpq.br/4783175034033264; Daher, Sandra Chaves; https://lattes.cnpq.br/6353400984683298; Caracas, George Clay dos Santos; https://lattes.cnpq.br/0243457123378494
This study aimed to develop and evaluate the anti-erosive potential of a solution and an experimental toothpaste enriched with natural antioxidants derived from cocoa (Theobroma cacao L.) on eroded dentin in vitro. The cocoa beans went through a process of fermentation, drying, roasting and grinding, followed by freeze-drying and obtaining aqueous cocoa extract. The extract was analyzed for total polyphenols and antioxidant potential using the DPPH (2,2-Diphenyl-1-Picrylhydrazyl) assay. After, an active ingredient-free toothpaste was developed and enriched with the concentrated cocoa-based polyphenol solution. The antioxidant potential of toothpaste enriched by DPPH. Eighty bovine dentin samples were pre-eroded in citric acid solution and randomized into three groups (n=20): G1 (Negative control) – toothpaste without active ingredients; G2 – concentrated cocoa-based polyphenol solution; G3: experimental toothpaste enriched with a concentrated cocoa-based polyphenol solution; and G4 (Positive control) – Elmex Protect anti-erosive commercial toothpaste (Colgate). After applying the materials, the erosive challenges were performed for 3 days, the eroded dentine surface loss (dSL-eroded) was determined by optical profilometer. The amount of degraded collagen (dColl) was calculated as the difference between (dSL-eroded) and (dSL-total - by immersing them individually in a saline solution containing type VII collagenase). Total calcium release (CaR) were evaluated by atomic absorption spectrometer. Additionally, qualitative surface analysis was performed using scanning electron microscopy (SEM). Data were analyzed using one-way ANOVA followed by Tukey's post hoc test (α = 0.05). The results showed that the cocoa extract presented a higher value of total polyphenols when compared to the toothpaste enriched with cocoa extract (p = 0.037). The antioxidant activity data showed a significant decrease when the toothpaste was manipulated (p = 0.025). Group G2 exhibited the lowest values for total dSL-eroded, dColl, and dSL-total when compared to other groups (p< 0.05). Group G2 exhibited the lowest values for calcium released to the citric acid (p< 0.05). In the SEM images, G3 showed dentine surface topography pattern with the presence of partially or total occluded dentinal tubules after treatments. This study demonstrated that the cocoa extract exhibited a higher total polyphenol content compared to the toothpaste enriched with cocoa extract. The proposed experimental solution showed an anti-erosive effect, preventing both organic and inorganic wear of dentin and promoting partial obliteration of dentinal tubules.
Influência erosiva do tucupi na resistência da união ao esmalte e dentina
(Centro Universitário do Estado do Pará, 2020-12-16) Carneiro, Reginna Vyctoria da Trindade Souza de Melo; Loretto, Sandro Cordeiro; Ribeiro, Mara Eliane Soares; http://lattes.cnpq.br/5959446285132739; http://lattes.cnpq.br/6988325260181483; Carneiro, Paula Mendes Acatauassú; http://lattes.cnpq.br/7375951134055063; Souza Junior, Mário Honorato Silva e; http://lattes.cnpq.br/9220706169410814
The present study evaluated the erosive influence of tucupi on the resistance of the adhesive bond to enamel and dentin. 168 healthy bovine incisors teeth were used, divided into 12 groups (n = 14). For erosive cycling, distilled water (negative control), cola-based soft drink (positive control) and tucupi were used. The adhesive strategies used were: (1) total acid conditioning (conventional) and (2) self-conditioning. All specimens were subjected to cycling with the drinks described above for 5 days and, after 24h of the 5th day, composite resin cylinders were made for the micro shear resistance test. The data showed normal distribution and were analyzed by two-way ANOVA, followed by the Tukey post-test (p≤0.05). There were no significant differences in enamel (p>0.05). In dentin, only the groups exposed to cola-based soft drink showed significant differences (p<0.01). The erosive challenge with tucupi did not influence the bond strength to enamel and dentin, independent of the adhesive strategy used.
Influência erosiva do tucupi na resistência de união de interfaces adesivas preestabelecidas em esmalte e dentina
(Centro Universitário do Estado do Pará, 2022-06-01) Wanderley, Marina Lima; Loretto, Sandro Cordeiro; Ribeiro, Mara Eliane Soares; http://lattes.cnpq.br/5959446285132739; http://lattes.cnpq.br/6988325260181483; Carneiro, Paula Mendes Acatauassú; http://lattes.cnpq.br/7375951134055063; Gatti, Joyce Figueira de Araújo; http://lattes.cnpq.br/0188270217176622
This study evaluated the erosive influence of tucupi on the bond strength of pre-established adhesive interfaces to enamel and dentin. A total of 168 healthy bovine incisors were used, divided into 12 groups (n=14) according to the type of substrate (enamel or dentin), type of erosive cycling (distilled water, cola soft drink or tucupi), and type of adhesive strategy used (Etch&rinse and self-etch). The groups were: G1: enamel (ESM)+distilled water (H2O)+ Etch&rinse (ER); G2: dentin (DEN)+H2O+ER; G3:ESM+ cola soft drink (RBC) + ER; G4: DEN+RBC+ER; G5: ESM+tucupi (TUC)+ER; G6: DEN + TUC + ER; G7: ESM + H2O + self-etch (SE); G8: DEN + H2O + SE; G9: ESM + RBC + SE; G10: DEN +RBC+ SE; G11: ESM+TUC+SE; G12: DEN+TUC+SE. Cylinders of resin were made on enamel or dentin surfaces and, after 24 hours, the specimens were submitted to erosive cycling for 5 days. After 24 hours of the last cycle, a microshear test was performed. Analysis of fracture was performed using a stereoscopic magnifying glass. The results were submitted to two-way ANOVA, followed by Tukey's post-test, with results described as mean and standard deviation (α=5%). The groups exposed to tucupi showed significantly lower bond strength (p<0.05) in relation to the negative control groups (distilled water), and were statistically similar to the positive control groups (cola soft drink), both in enamel and dentin, for both adhesive strategies used. Therefore, it was possible to conclude that erosive cycling with tucupi influenced the bond strength of pre-established adhesive interfaces in enamel and dentin, regardless of the adhesive strategy.