Effect of DLP and LCD Printing Technologies and Nitrogen Post-Curing on the Mechanical Performance of a Dental 3D-Printed Resin

Autores

  • Hussein Ahmed Al-Khafaji
  • Al-Hakam Jalil Ibrahim Al-Azzawi Institute of Medical Technology, Middle Technical University, Baghdad, Iraq.
  • Muna Hashim Muhabes
  • Ali AlQrimli

DOI:

https://doi.org/10.5195/d3000.2026.1471

Palavras-chave:

Dental Composites, Dental Restorations, 3D-Printing, Light Curing

Resumo

This study assessed the effects of printing technology (DLP vs. LCD), post-curing in a nitrogen environment and the interaction between these two factors on the compressive, tensile and flexural strengths of a 3D-printed dental resin. Specimens were virtually designed using Exocad dental CAD software and printed using two dissimilar printing technologies: a Digital Light Processing (DLP) printer (Shining 3D) and a Liquid Crystal Display (LCD) printer (Sol). Thereafter, the specimens were post-cured in either a conventional atmosphere or a nitrogen gas atmosphere. The specimens were then tested for compressive strength (in accordance with ISO 604), tensile strength (in accordance with ISO 527-1) and flexural strength (in accordance with ISO 4049). The main factor that significantly affected all three tested mechanical parameters was the printing technology. While the Shining 3D printer (DLP) demonstrated superior compressive strength, the Sol printer (LCD) yielded better performance in terms of both tensile and flexural strengths. Post-curing the specimens in a nitrogen-based environment presented a non-significant effect on the mechanical performance of the tested material. Additionally, the interaction between printing technology and curing atmosphere was not statistically significant. Within the limitations of this In Vitro study, printing technology is the predominant factor influencing the mechanical properties of the tested dental resin. DLP systems are preferred when compressive strength is the primary concern. Conversely, LCD-based printers are recommended when the priority is tensile and flexural strengths. The use of a nitrogen post-curing atmosphere did not improve the tested parameters.

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Publicado

2026-07-30

Edição

v. 14 n. 2 (2026)

Seção

Adults & the Elderly

Licença

Copyright (c) 2026 Hussein Ahmed Al-Khafaji, Al-Hakam Jalil Ibrahim Al-Azzawi, Muna Hashim Muhabes, Ali AlQrimli

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