JOURNAL OF OSAKA DENTAL UNIVERSITY

Vol. 42 No. 1      APRIL - 2008

ISSN: 0475-2058      UBIC: 172

SUMMARY

Patients with jaw deformities generally have lower occlusal force and unstable occlusion. It is important to understand the relation among occlusion, maxillofacial morphology and muscle morphology before carrying out an operation. We examined how occlusal force, maxillofacial morphology and muscle morphology were related in 14 men with mandibular prognathism. Maximum occlusal force was measured using Dental Prescale, and parameters relating to mandibular morphology were measured using lateral cephalography. The mean volume and inclination of the bilateral masseter muscles were calculated using magnetic resonance imaging, and multiple correlation analysis was applied to the obtained data. We found that occlusal force had a negative correlation with gonial angle and a positive correlation with inclination of the mandible, volume of masseter muscle, and posterior facial height (p<0.05). These results suggest that occlusal force is influenced by morphology of the mandible and the masseter muscle. (J Osaka Dent Univ 2008; 42: 51-56) Key words: Occlusal force; Mandibular prognatism; MRI.

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