Estabilidad de color de las resinas impresas 3D para restauraciones provisionales usando diferentes tiempos de postcurado, sometidas a envejecimiento acelerado y tinciones pigmentantes

Abstract

3D printing technology has simplified the dental production process by using various types of resin to create temporary restorations. However, the color stability of 3D resins is a factor to be taken into account. Objective: determine the color stability of 3D printed resins for temporary restorations using different post-curing times, subjected to accelerated aging and pigment stains. Materials and methods: Samples of bisacryl resin discs (control) and 3D resins with dimensions of 10 mm diameter x 1 mm (Prizzma, Horus) were obtained. They were then subjected to a post-curing process for 3 different photocuring times: 5, 10 and 15 minutes, then accelerated aging by thermocycling of 10,000 cycles. Subsequently, each group was immersed in two pigmenting substances: coffee and Coca-Cola for 24 hours, 7 and 30 days. To finally, using a dental spectrophotometer (Easyshade 4.0) color was measured. Results: When comparing color stability within the group of resins in the passage from the initial point to thermocycling (D1), Day 1 (D2), Day 7 (D7) and Day 30 (D4); (Kruskal-Wallis p = 0.003, p = 0.063, p = 0.008, p = 0.000) respectively, finding a significant difference showing that the Horus resin group was the most stable. Conclusions: Horus resin stood out as the most stable among the three analyzed (Horus, Bisacril and Prizma), showing less susceptibility to color changes. Although in the initial phase (D1) Bisacril and Prizma maintained their color, Horus presented significant differences in later phases (D2- D4), evidencing greater color stability.