Abstract
In prosthesis for patients with temporomandibular disorders, centric relation should be determined after the clinician has restored the physiological condition by controlling the load placed on the joint due to the treatment denture. An 82-year-old female edentulous patient with a history of temporomandibular disorder was admitted to fabricate new dentures. Determining the mandibular position, the gothic arch, tapping point, bilateral manipulation, light chin point guidance, and light guide tapping position were distinguished and displayed on the same coordinates using a digital gothic arch tracer, whereby centric relation was determined. Reproducibility of the centric relation was evaluated by standard deviation for 20 continuous guidances, the averages for each guidance were distinguished and displayed, and the positional relationship of the mandible was evaluated to verify the determined centric relation.The tracing apparatus was kept and stored for periodic observation of the horizontal mandibular position before and after fitting new dentures at the same coordinate. It was possible to observe correlating, approximating and focusing of the tapping point to the gothic arch apex. Occlusal stabilization suggested that the determined mandibular position was accurate, whereby the system offered a different method for judging the treatment results.
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