Navegando por Assunto "Resinas compostas"

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Avaliação da alteração de cor e rugosidade superficial de resinas bulk fill após escovação mecânica e envelhecimento
(Centro Universitário do Estado do Pará, 2018) Balla, Mariana Vieira; Esteves, Renata Antunes; http://lattes.cnpq.br/0001642348652061
The objective of this study was to evaluate, in vitro, the color stability (ΔE) and the surface roughness (Ra) of bulk fill (Filtek Bulk Fill e Tetric N-Ceram Bulk fill) and conventional (Filtek Z350XT e Filtek Bulk fill) composites, after mechanical brushing and aging. Specimens were made (n=5), with rounded bipartite matrix (8mm diameter x 4mm thickness). They were evaluated for color change (Spectrophotometer, Color Guide, BYK Gardner) and surface roughness (PROSCAN 2100 3D optical profilometer; Scantron), initially and after the tests. They were divided into 3 groups according to the tests: A-brushing (14,600 cycles, mechanical brushing machine, Elquip); B-thermocycling (5,000 cycles, 5-55°C, 30 seconds, Thermocycler, New Ethics-Scientific Equipment S.A.); C- thermocycling followed by brushing (same protocol). After all evaluations, the means were calculated and compared by means of analysis of variance (ANOVA) and Tukey's test. The level of significance was 5%. It was concluded that all resins were influenced by brushing and thermocycling. But the resin that suffered the most changes in color and roughness after mechanical brushing and thermocycling was Tetric N-Ceram Bulk fill resin.
Impacto da manipulação de resinas compostas com luvas de procedimento sobre suas propriedades mecânicas: uma revisão sistemática
(Centro Universitário do Estado do Pará, 2024-09-27) Manzoli, Lorâine Perez; Alencar, Cristiane de Melo; Takeuchi, Elma Vieira; http://lattes.cnpq.br/0868780137414166; http://lattes.cnpq.br/4783175034033264; Carneiro, Paula Mendes Acatauassú; http://lattes.cnpq.br/7375951134055063; Silva, Aryvelto Miranda; http://lattes.cnpq.br/0419320072195966
Objectives: To perform a systematic review to evaluate the impact of handling composite resin with a procedure glove on the mechanical characteristics of direct restorations. Materials and methods: The PRISMA guidelines for systematic reviews were followed. Experimental studies that evaluated the effect of glove-based composite resin manipulation on the mechanical characteristics of direct restorations were selected. The literature search was performed on September 11, 2024, in the following databases: MEDLINE via PubMed, SCOPUS, Cochrane Library, VHL Regional Portal, and Open Grey Literature. To analyze the risk of bias, this study followed a scoring system adapted from systematic reviews focusing on in vitro studies. Materials and methods: A total of 105 studies were found (94 were removed after removing duplicates and reading the title and abstract). Only 8 articles were selected for qualitative analysis, of which 1 was excluded because it met one or more exclusion criteria. Through a manual search, 2 more studies were included, resulting in 10 articles evaluated at the end of this systematic review. No meta-analysis was performed in this systematic review due to the high heterogeneity between the studies, greater than 50% (I2 = 86%). Conclusion: Most studies have shown that handling composite resins with procedure gloves can cause damage to mechanical characteristics related to surface microhardness, roughness, shear bond, bond strength, compressive strength and adhesive strength of direct restorations. However, cleaning with 70% alcohol appears to partially reverse this process. On the other hand, future research is needed to demonstrate the limited confidence in the estimated effects in this investigation.
Resinas bulk fill vs resinas convencionais na sensibilidade pós-operatória: uma revisão sistemática com meta-análise
(Centro Universitário do Estado do Pará, 2020-08-10) Giubilei, Fernanda Bernardes; Esteves, Renata Antunes; Alencar, Cristiane de Melo; http://lattes.cnpq.br/4783175034033264; http://lattes.cnpq.br/0001642348652061; Loretto, Sandro Cordeiro; http://lattes.cnpq.br/6988325260181483; Silva, Cecy Martins; http://lattes.cnpq.br/3349622952425723
Objective: To compare restorations performed with bulk fill resins vs. conventional resins in relation to postoperative sensitivity, through a systematic review of randomized clinical studies (RCT). Sources: Five electronic databases were searched: Pubmed, Cochrane, Web of science, Scopus and Open gray. Study selection: RCTs that compared the postoperative sensitivity observed in teeth restored with conventional resins vs bulk fill resins were included. Studies that used cavity and / or desensitizing liners were excluded from the study. The risk of bias was classified by the Cochrane guidelines. Two meta-analyzes were performed to assess the postoperative sensitivity of restorations made with bulk fill and conventional resin in the periods of 7 and 180 days. Results: Five RCTs with a low risk of bias were included in the meta-analysis. The evaluation after 7 days was performed in Non-Carious Cervical Injury and in Black classes I and II. Patients who used Bulk fill resins (n = 143) had lower postoperative sensitivity when compared to the use of conventional composite resin (n = 142) (-0.06 [-0.11, -0.01], p = 0.03). The second evaluation, after 180 days, was performed in class V cavities. There was no significant difference in postoperative sensitivity between patients who used Bulk fill resins (n = 125) compared to the use of conventional composite resin (n = 121) in the 180-day period (-0.02 [-0.11, 0.08], p = 0.73). Conclusions: Restorations with bulk fill resins showed lower postoperative sensitivity when compared to restorations using conventional resins up to seven days after restoration and there was no difference in postoperative sensitivity in the 180-day evaluation. However, due to the relatively limited amount of evidence to support this conclusion, more RCTs with a low risk of bias should be performed. Clinical significance: Postoperative sensitivity is very recurrent after restorative treatment, which has led to the development of new materials to circumvent this complication. The restorative treatment using bulk fill resins had a positive effect on postoperative sensitivity when compared to conventional resins within 7 days.