DSpace Coleção:

Avaliação da eficiência de métodos práticos para desinfecção de chupetas: um estudo in vitro

2025-06-27T17:46:24Z

Título: Avaliação da eficiência de métodos práticos para desinfecção de chupetas: um estudo in vitro Abstract: The aim of this study was to evaluate the microbial contamination of pacifiers in vitro and the efficacy of four diferents disinfection solutions (0,12% chlorexidine, hygienic bucal spray, própolis extract and mineral water plus detergent). The pacifiers were contaminated with Candida albicans (n= 60), Staphylococcus aureus (n=60) and Escherichia coli (n=60). After contamination, the pacifiers were disinfected with solutions, the silicone área were cutted and putted in saline solution and after inoculated in BHI. Data obtained for microorganisms counts were expressed as colonyforming units per millilitre (CFU/mL) and analysed for Kruskal Wallis and post - test Bonferroni. All tested solutions were able to significantly reduce contaminated pacifiers, however, the most effective reduction in Candida albicans, Staphylococcus aureus and Escherichia coli were observed after treatment with hygienic bucal spray in comparison to the others solutions mineral water plus detergente, 0,12% chlorexidine and propolis extract. The all solutions were effective of pacifiers disinfection. Tipo: Dissertação

Novas possibilidades em Cirurgia Virtual Guiada: uma revisão Sistemática da literatura

2025-06-27T17:43:16Z

Título: Novas possibilidades em Cirurgia Virtual Guiada: uma revisão Sistemática da literatura Abstract: After the advent of better radiographic images, such as conical beam tomography, new implantation techniques were created. The technique of computerguided implants is an example of how technology can help both the dental surgeon and improve the safety of treatment for the patient. However, new technologies have been studied and tested to improve standards of accuracy, patient comfort, and predictability of implant treatment. This study intends, through a literature review, to go through the concepts already established in guided virtual surgery as well as to highlight the new technologies employed in the area, since this may indicate a trend in the field of implantology. Tipo: Dissertação

Influência da arginina na permeabilidade dentinária de um sistema adesivo

2025-06-27T17:39:10Z

Título: Influência da arginina na permeabilidade dentinária de um sistema adesivo Abstract: Considering that the dentin permeability has relevant clinical implications and may jeopardize the success of adhesive procedures, it is essential to study substances that reduce this permeability and its deleterious effects. The objective of the study was to measure the occlusive capacity of arginine-based substances, prior to the application of AdperTM Single Bond 2 adhesive system (3M ESPE), through the evaluation of dentin permeability. A total of 55 dentin discs with a thickness of 1.5 mm were randomly distributed in 5 groups (n=11). After conditioning with 37% phosphoric acid for 15 seconds, the maximum permeability (Lp Max) was obtained. Subsequently, the specimens received the application of the substances proposed according to the groups: CTRL - without substance; ARG - Arginine solution 8%; ARGC - Arginine solution 8% and calcium carbonate 0.15%; nARG - Nanosilica suspension incorporated with arginine 8% and nSI - Suspension of nanosilica. The disks treated with the occlusive substances were subjected to permeability assessment (Lp1), then applied the adhesive system and a new permeability reading was performed (Lp2). Occlusive substances reduced permeability, but there was no difference between groups before and after the application of the adhesive system. In the ARG (Wilcoxon test, p = 0.007), ARGC (p = 0.014) and nSI (p = 0.032) groups, the application of the adhesive system helped to further reduce permeability. The nARG group showed a significant reduction in dentin permeability compared to the group without occlusive substance (CTRL) (Dunn's posttest, p <0.05). It was concluded that the occlusive substances were able to reduce the dentin permeability before the adhesive system application. Among the substances used, the previous use of nanosilica incorporated with 8% arginine was more efficient in reducing dentin permeability. Tipo: Dissertação

Avaliação das alterações teciduais induzidas pelo ácido hialurônico na papila interdentária de ratos

2025-06-27T17:29:54Z

Título: Avaliação das alterações teciduais induzidas pelo ácido hialurônico na papila interdentária de ratos Abstract: Hyaluronic acid (HA) is well underway in dentistry for the treatment of inflammation, facial aesthetics, mouth injuries and interdental papilla (IP) filling. The aim of this study was to evaluate whether HA application in rat IP promotes leukocyte infiltrate exacerbation and hemorrhage. Fifty-one animals were randomly divided into experimental group (EG) and control group (CG), all animals received the first application of the substances (HA and saline solution - SS). GE1 (n = 7), GE2 (n = 9) and GE3 (n = 9) and GC1 (n = 7), GC2 (n = 9) and GC3 (n = 9) were euthanized at 12-hour experimental times. , 72 hours and 7 days, respectively. GE4 (n = 9), GE5 (n = 8) and GE6 (n = 9) GC4 (n = 9), GC5 (n = 8) and GC6 (n = 9) received new application 7 days after the first intervention. and were euthanized at 12 hours, 72 hours and 7 days respectively. Slide evaluation was performed by two previously calibrated and blinded examiners. In the comparison between GE1 and GE6, the intensity of leukocyte infiltrate decreased (p <0.005). G1E presented higher intensity of inflammatory infiltrate than G1C (12h) (p <0.005). In EG there was presence of mild and moderate hemorrhage when compared to CG (p <0.005). When comparing GC with GE at the same experimental times, there was a statistical difference between the groups G1C and G1E (p = 0.0217), G2C and G2E (p <0.005) and G3C and G3E (p <0.005). Between G4C and G4E, G5C and G5E and G6C and G6E there was no statistical difference (p> 0.05). It was concluded that the application of HA in rats IP increases the intensity of the leukocyte infiltrate, with predominance of polymorphonuclear cells, after 12 hours of its application progressively regressing until the 14th day. Haemorrhage caused by HA application was histologically lighter and more moderate when compared to saline solution, and there was a greater presence of hemorrhage in the groups that received only one HA application. Tipo: Dissertação