Mandibular Displacement Related to Simulated Loss of Posterior Occlusal Support

Mandibular displacement related to simulated loss of posterior occlusal support was investigated. Twenty-four volunteers with natural dentitions were selected. To change the posterior occlusal support, occlusal splints fitted to maxillary dental arches were cut in sequence from the most posterior to anterior. The more the absence of posterior occlusal support increased, the more both condylar displacements were increased (R: 0.97mm, L: 0.94mm). Moreover, subjects could be divided into two groups depending upon their condylar mobility following with reduced occlusal support. These results suggest that individual adaptability to the imbalanced occlusal condition should be always considered. KEY WORDS: Occlusal support, Condylar position, Mandibular displacement, Shortened dental arch