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[Effect of position of artificial occlusal interference on mandible moving track during protrusive movement].

PURPOSE
The purpose of this study was to observe the effect of position of occlusal interference on track of mandibular incisal point during protrusive 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 used for linear correlation between occlusal interference position and mandible protrusive moving track by SAS 9.0 software package.


RESULTS
The results showed that along with the retrusion of occlusal interference, the move distance of mandibular incisal point on arrowy axis tended to increase, while on vertical axis ineffective change happened and on horizontal axis tended to lean to the contralateral side. The linear regression equation of mandibular incisal point move distance on arrowy axis along with the occlusal interference position was: ŷ=4.9429+0.1336x(1), delta=0.3144, P<0.001.


CONCLUSION
The position of occlusal interference affected the track of mandibular incisal point during protrusive movement significantly, such as that along with the retrusion of the occlusal interference, the mandible protrusive moving track tended to be more anterior and partially to the contralateral side. There was a linear correlation between occlusal interference position and mandible moving track on the arrowy axis.