Coroas dentárias temporárias em impressão 3D

Abstract

The importance of temporary restorations in oral rehabilitation is unquestionable, and with the recent technological advancements, 3D printing appears as an interesting tool for many procedures in dentistry, as temporary restorations. There is a large number of 3D printers, with different technologies; thus, it is important to compare properties of conventional temporary restorations with those manufactured by 3D printing. This study aimed to compare properties of temporary restorations made from 3D prints, by different techniques (SLA and SLS) with those obtained through the conventional technique using a previous impression using acrylic or bisacrylic resin. The properties analyzed were flexural strength, hardness, compressive strength, roughness and biofilm deposition. Acrylic resin obtained the highest hardness value among the analyzed groups (p<0.001), while the elastic modulus was lower for the 3D printed materials. There was no statistically significant difference for biofilm deposition, but values for roughness showed statistically significant differences (p<0.0001), with bisacrylic resin and SLA printing before and after polishing showing the same performance, followed by acrylic resin and SLS printing, with roughness after polishing of 0.7 μm, 0.9 μm and 1.2 μm, respectively. Consequently, temporary restorations made from 3D printing materials have similar perforance compared to those produced with conventional materials. However, there are still limitations on their use in clinical practice, depending on the range of colors available and characterization of these materials regarding their use and toxicity. Finally, considering the limitations of this study, further studies are needed to test and improve the physical-mechanical properties of temporary restorations made by 3D printing, considering the evaluation of color and possible changes, gloss and abrasive wear resistance and other important features that were not considered in this study.