
A study evaluated the effect of build orientation on the fabrication trueness of additively manufactured (AM) implant-supported maxillary prostheses revealed significant orientation-dependent deviations when compared with subtractively manufactured high-impact polymer (SM-HIP) prostheses. Using a digitally designed prosthesis model, five different orientations were tested (0° to 90°), and results indicated that the AM-0 orientation showed the highest overall and non-occlusal accuracy (p ≤ 0.022), while AM-90 exhibited the highest surface and linear deviations (p < 0.001). SM-HIP prostheses displayed the least occlusal region deviations (p < 0.001) and higher canine-to-canine distances compared to other orientations.
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