Characteristics of resin with different color in DLP printing for denture base

Abstract

In the field of prosthodontics, in addition to meeting basic mechanical and biocompatibility requirements, ensuring the color of digital light-processing (DLP) denture base matches with the color of the oral mucosa and denture is imperative. Resins of different shades may lead to complex optical effects during the DLP printing process and then significantly affect the final product quality. Therefore, this study investigates the effect of resins with different red shades (G0-G5) on the DLP-printed specimens. We analyzed the L*, a*, and b* data for different shades, determined the degree of conversion using Fourier-transform infrared spectroscopy, conducted three-point bending tests to obtain the flexural strength and elastic modulus, performed Vickers hardness tests, and conducted hydrophilicity tests on the sample surfaces. Cell toxicity was also tested using L929 cells. The results indicated that shade variation significantly affected the degree of conversion, flexural strength, elastic modulus, Vickers hardness values, and cell toxicity across the different groups (p < 0.001). In the personalized customization of oral restoration, how to achieve a balance between various performance factors still needs to be solved, such as aesthetics, mechanics and biocompatibility. These discoveries not only provide a scientific basis for the application of DLP technology in the manufacturing of denture base resins but also offer valuable insights for the field of aesthetic prosthodontics. [GRAPHICS]