Características ópticas das restaurações provisórias contemporâneas em função do tempo de imersão em soluções ácido-corantes

• Autor(a) principal: Kanda, Roberta Yoko [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203426; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-05-29/000915291.pdf
• topic: Resinas acrílicas; Projeto auxiliado por computador; Cor; Acrylic resins

Introduction: With the technological advances and development of new dental materials, there are new options for the fabrication of interim prostheses, with emphasis on bis-acrylic resins and pre-fabricated polymer blocks for CAD/CAM systems. Objective: To evaluate the long-term color stability (ΔE), translucency (TP), and contrast ratio (CR) of different resins used to fabricate interim prostheses, after immersion in acidic/staining solutions. Materials and methods: One hundred and sixty specimens of 10 × 10 × 3 (± 0.005) mm were prepared and divided into 16 groups (n = 10), according to the material and immersion solutions. Four resins were evaluated: heat-polymerized acrylic resin (VIPICor) - HPAR, auto-polymerized acrylic resin (Alike) - APR, nanoparticulated bis-acrylic resin (Protemp™ 4) - BR, and prefabricated poly (methyl methacrylate) block (PMMA) for CAD/CAM systems (Telio CAD) - CADR. The resins were immersed for 7, 14, 28, 90, and 180 days in artificial saliva (control), cola beverage, coffee, and red wine. A spectrophotometer was used to evaluate the optical characteristics before and after each immersion period. Data were evaluated by 3-way repeated measures ANOVA and the Bonferroni test (α=.05). Results: For color stability (ΔE), the period with the smallest alteration was at 7 days and the highest was at 180 days, independent of the material. After 180 days, the APR group presented the highest value for coffee (20.10) and the CADR group presented the smallest value (1.89) for the cola beverage (P<.05). For the contrast ratio (CR), the highest values were obtained at 180 days in the BR group in coffee (1.35) and wine (1.18) (P<.05). Higher translucency (TP) values were obtained in the BR and CADR groups in the initial period and only in the CADR group in the periods of 14, 28, and 90 days (P<.05). Conclusion: The type...