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Authors
Abstract(s)
INTRODUÇÃO: O PMMA é dos materiais mais frequentemente utilizados em
Prótese Fixa como material para elaboração de coroas/pontes provisórias.
Recentemente têm sido adicionados ao mercado resinas adaptadas à tecnologia
CAD/CAM como forma de superar aspetos negativos das resinas ditas convencionais
à base do PMMA (resina acrílica e bis-acrílica). Estas restaurações frequentemente
são elaboradas em zonas estéticas, pelo que a sua alteração de cor é um aspeto
importante a ter em conta na seleção da resina a utilizar. O objetivo deste estudo é
avaliar a estabilidade de cor de diferentes resinas utilizadas na confeção de
provisórios em prótese fixa.
MATERIAL E MÉTODOS: Para este estudo experimental foram confecionados
quinze provetes de cada tipo de resina (resina acrílica, resina bis-acrílica, resina de
fresagem, resina de impressão 3D), de forma circular e de dimensões padronizadas
(10mm de diâmetro e 2mm de espessura), totalizando 60 provetes em estudo. Estes
foram imersos em diferentes soluções (água destilada, vinho e café) por um período
de dez dias. A avaliação quantitativa da alteração de cor foi realizada de acordo com
o sistema CIELAB com recurso a um colorímetro calibrado PCE-CSM 5 (PCE
instruments®). Os dados adquiridos foram submetidos a uma análise estatística do
programa SPSS com um nível de significância de 0,05.
RESULTADOS: A solução café apresenta os resultados de alteração de cor
mais elevados em todos os materiais. Por outro lado, a solução de água destilada
apresentou os valores mais baixos. Quanto aos materiais concluiu-se que as resina
TAB e de Fresagem diferem significativamente de todos os outros materiais, mas as
resinas Structur e de impressão 3D são estatisticamente idênticas
CONCLUSÃO: Após as imersões nas respetivas soluções e as medições de
cor com o colorímetro, a resina que se manteve mais estável foi a resina TAB 2000®,
por outro lado, a mais instável foi a resina de Impressão 3D (Dental Sand®). Em
relação às soluções analisadas, o café foi a que demonstrou maiores valores de
alteração de cor, sendo a água destilada a que melhor resultado apresentou.
INTRODUCTION: PMMA is one of the most commonly used materials in Fixed Prosthodontics for the fabrication of temporary crowns/bridges. Recently, CAD/CAMadapted resins have been introduced to the market as a way to overcome the drawbacks of conventional resins, PMMA-based resins (acrylic and bis-acrylic resins). These restorations are often fabricated in esthetic areas, making color stability an important aspect to consider when selecting the resin to be used. The aim of this study is to evaluate the color stability of different resins used in the fabrication of fixed prosthodontic temporaries. METHODOLOGY: For this experimental study, fifteen specimens of each resin type (acrylic resin, bis-acrylic resin, milling resin, 3d printing resin) were fabricated in circular shape with standardized dimensions (10mm diameter and 2mm thickness), totaling 60 specimens in the study. These specimens were immersed in different solutions (distilled water, wine, and coffee) for a period of ten days. Quantitative color change evaluation was performed using the CIELAB system with a calibrated colorimeter, PCE-CSM 5 (PCE instruments®). The acquired data were subjected to statistical analysis using the SPSS software with a significance level of 0.05. RESULTS: The coffee solution showed the highest color change results for all materials. On the other hand, the distilled water solution had the lowest values. As for the materials, it was concluded that TAB resin and milling resin differed significantly from all other materials, while Structur resin and 3D-printed resin were statistically identical. CONCLUSION: After immersion in the respective solutions and color measurements with the colorimeter, TAB 2000® resin demonstrated the highest color stability, whereas 3D-printed resin (Dental Sand®) showed the least stability. Among the analyzed solutions, coffee exhibited the highest color change values, while distilled water showed the best result.
INTRODUCTION: PMMA is one of the most commonly used materials in Fixed Prosthodontics for the fabrication of temporary crowns/bridges. Recently, CAD/CAMadapted resins have been introduced to the market as a way to overcome the drawbacks of conventional resins, PMMA-based resins (acrylic and bis-acrylic resins). These restorations are often fabricated in esthetic areas, making color stability an important aspect to consider when selecting the resin to be used. The aim of this study is to evaluate the color stability of different resins used in the fabrication of fixed prosthodontic temporaries. METHODOLOGY: For this experimental study, fifteen specimens of each resin type (acrylic resin, bis-acrylic resin, milling resin, 3d printing resin) were fabricated in circular shape with standardized dimensions (10mm diameter and 2mm thickness), totaling 60 specimens in the study. These specimens were immersed in different solutions (distilled water, wine, and coffee) for a period of ten days. Quantitative color change evaluation was performed using the CIELAB system with a calibrated colorimeter, PCE-CSM 5 (PCE instruments®). The acquired data were subjected to statistical analysis using the SPSS software with a significance level of 0.05. RESULTS: The coffee solution showed the highest color change results for all materials. On the other hand, the distilled water solution had the lowest values. As for the materials, it was concluded that TAB resin and milling resin differed significantly from all other materials, while Structur resin and 3D-printed resin were statistically identical. CONCLUSION: After immersion in the respective solutions and color measurements with the colorimeter, TAB 2000® resin demonstrated the highest color stability, whereas 3D-printed resin (Dental Sand®) showed the least stability. Among the analyzed solutions, coffee exhibited the highest color change values, while distilled water showed the best result.
Description
Keywords
Prótese fixa PMMA CAD/CAM Restaurações provisórias Cor Colorímetro Fixed prosthodontics Temporary restorations Color Colorimeter