2026-01-132026-01-132025CRUVINEL FILHO, Jorge Luiz de Oliveira et al. Failures in cementation techniques of glass fiber posts with application of 3D digital prototyping and post-processing CBCT software. Brazilian Journal of Oral Sciences, Piracicaba, v. 24, e256803, 2025. DOI: 10.20396/bjos.v24i00.8676803. Disponível em: https://www.scielo.br/j/bjos/a/Mwbsr6NJnwmDqyK5DXNvBdq/?format=html&lang=en. Acesso em: 6 jan. 2025.1677-3217e- 1677-3225https://repositorio.bc.ufg.br//handle/ri/29391Failures in the cementation technique of intraradicular posts can pose risks for root canal treatment failure and crown loss. Aim: This study assessed cementation failures of glass fiber post systems using two techniques with application of 3D digital prototyping and post-processing CBCT software. Methods: Seventy-two maxillary central incisors were 3D-printed and divided into groups: 1. Splendor-SAP posts; 2. anatomical posts; 3. conventional glass fiber posts (control). Two cementation techniques were employed: manual and self-mixing. CBCT scans were taken, and root canal third images were analyzed using e-Vol DX software. The Chi-square test was applied at a significance level of 0.05%. Results: Regardless of the cementation technique used, a statistically significant difference was observed among the post systems. Group 2 showed the best results, while Group 1 exhibited the worst. The cementation technique did not significantly affect the presence of gaps (voids) in Groups 2 or 1 across the three evaluated areas. For all post systems and both cementation techniques, there was a significant difference among the three thirds, except for Group 1 using manual cementation. Conclusions: Irrespective of the cementation technique, significant differences were noted among various glass fiber post systems. The cementation technique did not impact the occurrence of voids in anatomical or Splendor-SAP glass fiber posts. However, with conventional glass fiber posts, the self-mixing cementation technique had a positive effect on reducing voids.engAcesso Abertohttp://creativecommons.org/licenses/by-nc-nd/4.0/Post and core techniqueCementationDental cementsEndodonticsArtigo10.20396/bjos.v24i00.8676803