An evaluation of printing orientation on the trueness and dimensional accuracy of two resin materials over nine months

RMJ. 2026; 51(3): 708-711

doi: 10.5455/rmj.20260323051732

Shilan Hameed Fatah, Bahar Jaafar Selivany, Nabeel Abdulla S. Martani.

Abstract	Download PDF		Post
Objective: To evaluate the effect of printing orientation on the dimensional accuracy, trueness, and 9-month stability of two 3D-printed dental resins. Methodology: In this in vitro study, 108 specimens of Model Resin Material (MRM) and Interim Prosthesis Material (IPM) were printed at 0°, 45°, and 90° (n=9/group). Specimens were scanned immediately and after nine months using a 3Shape lab scanner. Dimensional accuracy was assessed by linear measurements and trueness by RMS deviation using GOM Inspect. Data were analyzed with ANOVA (α=0.05). Results: Printing orientation had no significant effect on dimensional accuracy or trueness (p>0.05). All groups showed significant post printing shrinkage (p Key words: 3D printing, interim prostheses, printing orientation, dimensional accuracy, trueness.