Evaluation of mechanical properties of 3D printing resin for use in removable orthodontic retainers

Abstract

At the end of an orthodontic treatment, it is essential that the patient wears an orthodontic retainer, in order to ensure the stability of the dental elements that were subjected to movement during the treatment. An alternative is resin retainers manufactured using 3D printing technology, representing a valid removable retainer alternative. The objective of this in vitro study was to investigate printed resins for orthodontic purposes and compare them with materials traditionally used to manufacture removable retainers. Specimens were manufactured using 3D printing resin (3D) and vacuum crystal plate (PC). The physical and mechanical properties of percentage error and flexural strength before and after thermal aging of the materials were evaluated. Data were analyzed using two-way analysis of variance and Student's t-test. The printing accuracy of the 3D group showed no statistical difference in length, width and height. The flexural strength before and after thermal aging of the 3D group was higher than that of the PC group (P < 0.05). Resin manufactured through 3D printing has demonstrated remarkable physical and mechanical properties, making it an appropriate choice for producing printed orthodontic retainers for long-term use after orthodontic treatment.