Odontologia

URI Permanente desta comunidadehttps://repositorio.cesupa.br/handle/prefix/44

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    Análise da resistência de união em novas cimentações de laminados cerâmicos após remoção com laser Er:YAG ou ponta diamantada
    (Centro Universitário do Estado do Pará, 2025-06-02) Rosendo, Alana Mouzinho; Soares, Amanda Celina Pires; Carneiro, Paula Mendes Acatauassú; Alencar, Cristiane de Melo; https://lattes.cnpq.br/4783175034033264; https://lattes.cnpq.br/7375951134055063; Vasconcelos, Bianca Nicoli Lopes de; https://lattes.cnpq.br/9767085206335324
    The longevity of ceramic laminate veneers can be affected by several factors, which may necessitate their removal. With the advancement of minimally invasive approaches in restorative dentistry, the Er:YAG laser has gained prominence as an effective tool for clinical retreatments. In cases such as fractures, aesthetic alterations, poor adaptation, or patient dissatisfaction, the removal of previously placed ceramic veneers may be required. In such scenarios, laser-assisted removal enables controlled debonding of restorations without significantly compromising the underlying dental structure, allowing for the conservative and safe placement of new ceramic restorations in the same location. Although laser removal appears to be a promising technique to facilitate this process, its effects on tooth structure and influence on subsequent adhesive procedures have been under investigation. The objective of this in vitro study was to evaluate and analyze the bond strength of lithium disilicate ceramic veneers cemented onto bovine dentin, where the previous veneer had been removed using either an Er:YAG laser or a diamond bur. Thirty bovine incisor crowns were used and randomly divided into the following groups (n = 10): G1 – Cementation of ceramic veneer without prior removal (control); G2 – Cementation after veneer removal with Er:YAG laser; G3 – Cementation after veneer removal with a diamond bur. All veneers were bonded using a conventional adhesive system and light-cured resin cement. The veneers were removed following the protocol for each group, and new veneers of the same material were bonded using the same adhesive technique. Subsequently, shear bond strength testing and fracture pattern analysis were conducted. Data were analyzed using oneway ANOVA with a significance level of 0.05. No statistically significant difference in shear bond strength was found among the groups (F(2, 27) = 0.79; p = 0.466), and the predominant fracture pattern in all groups was cohesive (Type 3 – within the resin cement). These findings indicate that the method used for removing the previous ceramic veneer—either diamond bur or highpower laser—did not affect the bond strength of the newly bonded veneer.
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    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.