Estabilidade de cor de resinas acrílicas de provisórios de prótese fixa

Abstract

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.

Date of Award	26 Jul 2023
Original language	Portuguese
Awarding Institution	Universidade Católica Portuguesa
Supervisor	Patrícia Fonseca (Supervisor) & Helena Salgado (Co-Supervisor)