o:2091 Intra- and Interexaminer Measurement Variability Analysis of an Orthodontic Gauge Device to Determine Incisor Occlusal Surface Angles in the Horse en Incisor malocclusions are common in horses. As yet, an evidence-based understanding of incisor occlusal surface angle dynamics and normocclusal range is missing. Orthodontic measuring devices could help unravel this information objectively but imply measurement validation. We evaluated intra- and interexaminer variability of repeated sagittal and transversal incisor occlusal surface angle measures using a commercial orthodontic gauge device (MaPHorse1). Five examiners (two experienced, three inexperienced) measured six cadaver heads on 2 consecutive days in a blinded block-randomization design, resulting in 16 measures per examiner*head. Sagittal and transversal angle measures revealed low intraexaminer variability at scale-level independent mean SDs of α 0.58° and α 0.69°, respectively. Sagittal angle measures associate with low interexaminer variability, showing small mean angle differences (max. α 0.51° ± 0.35°), small scatter, and more consistent data reproducibility. Despite comparable mean interexaminer differences, the spread of transversal angle measures was relevantly higher using the proposed landmarks (average 2.2-fold higher interquartile range). The measurement performance of experienced and inexperienced examiners did not systematically differ. The time required for individual measurements was already comparable after 24/96 repetitions. This instrument may help deciphering sagittal angle normocclusal range and orthognathic dynamics and, with a proposed procedural amendment, transversal angle as well. Beam Computed-Tomography; Landmark Identification; Equine Incisor; Reliability; Malocclusion; Disorders; Accuracy; Teeth 1552099 10.3390/vetsci9090481 2023-09-08T12:17:15.951Z 44 yes 46 Silvio Kau University of Veterinary Medicine Vienna 0000-0001-9538-9976 Katharina S. Motter University of Veterinary Medicine Vienna person Viktoria J. Moser University of Veterinary Medicine Vienna person João R. Kunz Veterinary Clinic Gessertshausen Altano GmbH person Matteo Pellachin Private Equine Veterinary Dentist and Specialist on Equine Orthodontics Padova person Bettina Hartl University of Veterinary Medicine Vienna person 0000-0002-0259-1073 application/pdf 879153 https://phaidra.vetmeduni.ac.at/o:2091 no yes 16 70 1552253 Veterinary Sciences 19 9 9 MDPI 2022