Reliability of measuring mandibular movement and condylar position using an optical jaw registration system.

The article focuses on evaluating the reliability of an optical digital jaw registration system, the Tizian JMA Optic (zebris Medical, Germany), for measuring mandibular movements and condylar position in healthy adult patients. In a prospective clinical study with 20 participants aged 19 to 77, mandibular movements (mouth opening, protrusion, laterotrusion) and condylar positions were recorded by two calibrated examiners across two appointments about one week apart. Results showed excellent intra- and inter-appointment reliability, with intraclass correlation coefficients (ICCs) of 0.95 for mouth opening, 0.94 for protrusion, 0.87–0.89 for laterotrusion, and 0.98 for condylar position, without significant examiner-related differences. The study concludes that this digital system provides reliable measurements suitable for clinical functional diagnostics and digital prosthetic workflows, while noting that further research is needed to assess its benefits in patient populations with temporomandibular disorders or other vulnerabilities.