Purpose: To evaluate the effect of position of occlusal interference on the track of mandibular incisal point during lateral movement.
Methods: The changes of track of mandibular incisal point along with the changing of occlusal interference position were recorded by Arcus DigMa mandibular moving track analysis system. The relativity between occlusal interference position and mandibular incisal point moving track on arrowy axis, vertical axis and horizontal axis was analyzed. Regression analysis was performed for linear correlation between occlusal interference position and mandible lateral moving track using SAS 9.0 software package.
Results: The results showed that along with the retrusive of occlusal interference, the moving distance of mandibular incisal point on horizontal axis both to contralateral side and to ipsilateral side tended to increase. The linear regression equation of mandibular incisal point moving distance on horizontal axis along with the occlusal interference position was as follows,to ipsilateral side,y;=8.2262+0.1082 x 1,delta=0.1786,P<0.001; to contralateral side,y;=9.1098+0.07099 x 1-0.02650 x 2,delta=0.05989,P<0.001.
Conclusion: The position of occlusal interference affects the track of mandibular incisal point during lateral movement significantly, along with the retrusive occlusal interference, the mandible lateral moving distance on horizontal axis tends to be increased and shows linearity.Supported by Shanghai Leading Academic Discipline Project (Grant No. T0202).
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