Study Of Condyle Movement With Facial Asymmetry

ObjectiveDiscover the condyle movement characters and offer the guidelines for clinical diagnosis,analysis and treatment of facial asymmetry.MethodsTwenty volunteers with facial asymmetry were chosen as experiment subjects for this study,aged from 21 to 23 years with the mean years of 22.2,11 males and 9 females. Twenty volunteers with normal occlusion were chosen as control subjects,aged from 20 to 24 years with mean years of 22.3,8 males and 12 females.The tracings of condyle movement were recorded by CADIAXâ…¢Then the qualitative and quantitative characters of the tracings were studied.All the data was analyzed using SPSS 13.0 software package.The Indepentdent-Samples T test was used between the experiment subjects and the control,while the Paired-Samples T test between the deviated side(the side to which the chin was deviated) and the non-deviated side of the experiment.ResultsDuring the open/close movement and the protrusion/retrusion movement the traces of the bilateral condyle were zigzag,inconsistent and asymmetrical.The side shift of the condyle was increased in experiment subjects.The condylar traces of the control subjects were symmetrical,regular,smooth and fluent.The bilateral condylar shift and inclination have no statistical difference.The shift in the direction of the sagittal and space in the non-deviated side condyle were smaller than the deviated sides,and the shift in the direction of the sagittal,vertical and space were smaller than the control groups(P<0.05). There was no statistical difference in the sagittal condylar inclination and transversal condylar inclination in max-mm shift between the bilateral condyle of the experiment subjects.The transversal condylar inclination of the deviated side was larger than that of the non-deciated side in 5mm shift.But it was contrary in the transversal condylar inclination(P<0.05).When the bilateral side was in the max-mm,5mm shift,the sagittal condylar inclination of the experiment subjects was smaller than that of the control subjects,while the transversal condylar inclination was larger(P<0.05).During the protrusion/retrusion movement,the sagittal condylar inclination of the non-deviated side was smaller than that of the deviated side,while the shift in vertical direction of the non-deviated side was smaller than that of the control subjects(P<0.05).During the lateral excursion movement,the tracings were asymmetry when the bilateral condyle being the non-working side respectively.The sagittal,vertical and space shift in the non-deviated side were smaller than those in the deviated sides and the control subjects.The sagittal condylar inclination in non-deviated side in 5mm shift was smaller than that in the deviate sides(P<0.05).Being the working side respectively,the sagittal condylar inclination in the non-deviated side was larger than that in the deviated sides, while the transversal condylar inclination in the non-deviated side was smaller than that in the deviated side.The sagittal condylar inclination in deviated side was smaller than that in the control subjects.The transversal condylar inclination in non-deviated side was smaller than that in the control subjects(P<0.05).There was no statistical difference between the two groups in Gamma value of the hinge axis of border movement(P>0.05).Conclusions1.Not only morphological asymmetry but also asymmetrical condyle movement in length and inclination were the facial asymmetrical patients.2.Compared to the control subjects,the tracings of the experiment were zigzag, inconsistent and limited.At the same time,the bilateral movement was asymmetrical and the side shift increased.3.When the deviated side and the non-deviated were the non-working side and the working side respectively,the tracings of the condyle were asymmetry.