[Characteristics of the condylar movement traces during lateral excursion of the unilateral posterior buccal crossbite].

PURPOSE: To investigate the characteristics of the condylar movement traces during lateral excursion of the unilateral posterior buccal crossbite and to compare the difference with the individual ideal occlusion. METHODS: Twenty-six subjects with normal occlusion and 26 subjects with unilateral posterior buccal crossbite were tested by CADIAX for the condylar movement. The lateral excursion traces were recorded. The data were analyzed using SPSS 10.0 software package, group t test,paired t test or rank sum test were used to compare the difference between the two groups. RESULTS: The condylar traces of the experiment subjects were rugged and asymmetrical. The sagittal,vertical and space shift of the non-buccal crossbite side were larger than those of the buccal crossbite side and the normal subjects, but the horizontal shift was significantly smaller(P<0.05). The sagittal condylar inclination of the non-buccal crossbite side was significantly larger than that of the buccal crossbite side and the normal subjects, but the transversal condylar inclination was significantly smaller(P<0.05). CONCLUSION: The bilateral condylar movement traces during lateral excursion of the unilateral posterior buccal crossbite are asymmetrical.