Effect of antagonist arch on precision and trueness of digital maxillomandibular relation in partially edentulous cases using five different intraoral scanners.

The study evaluated the trueness and precision of maxillomandibular relation records in intraoral scans of partially edentulous cases using dentate and edentulous arch antagonists. Three 3D-printed models were prepared: one maxillary and mandibular partially edentulous model and a mandibular dentate model. The partially edentulous models included two dental implants each (Bone Level RC) in the edentulous molar region. Edentulous antagonist (AE: models 1 and 2) and dentate antagonist (AD: models 1 and 3) groups were analyzed separately. Precision spheres were placed on each model to evaluate interocclusal distances. Reference scans were acquired by the industrial scanner (Nikon Altera). Separate model scans and interocclusal records were acquired using five intraoral scanners: Primescan (PS), Trios 3 (T3), Trios 4 (T4), Carestream 3600 (CS), and Medit i500 (Me). Statistical analysis included Shapiro-Wilk normality tests, Mann-Whitney Wilcoxon, or Student's t-tests (p < 0.05). Trueness and precision varied across scanners. For AD, significant differences in trueness were noted for most scanner comparisons, except for Me vs. PS, Me vs. T3, Me vs. T4, and T3 vs. T4 (p > 0.05). AD precision was statistically different among scanners, except for PS (p > 0.05). In AE, only PS vs. T3 did not show a significant difference (p > 0.05). Dentate and edentulous antagonist arches affect precision in intraoral scans of partially edentulous jaws but do not influence trueness.