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[Cephalometric analysis on patients with TMJ ankylosis in different ages].

OBJECTIVE
To determine the cephalometric characteristics of the patients with TMJ ankylosis in deferent ages and to find the relationship between the period with TMJ and the cephalometric characteristics.


METHODS
By cephalometric analysis of 46 male patients with TMJ ankylosis and several normal people in deferent ages, we detected the relationship among the ages of the patients, the period with TMJ ankylosis and the cephalometric characteristics by means of SPSS for Win 95/98.


RESULTS
The cephalometric characteristics of the patients showed their maxilla and mandible retruded in posterior and superior direction, the hyoid bone displaced posteriorly and inferiorly. The middle and inferior pharygeal space decreased, the TSA/OPA increased significantly. There was an obvious positive correlation between the period with TMJ and hyoid bone position(r=0.46, p=0.009; Y=1.58+0.56X), and remarkable positive correlation between the period with TMJ and TSA/OPA(r=0.5, p=0.00 Y=72.76+0.64X).


CONCLUSION
In patients with TMJ ankylosis, the mandible and maxilla retruded posteriorly and superiorly,the hyoid bone displaced posteriorly and inferiorly, the middle and inferior pharygeal space decreased, the TSA/OPA increased remarkably. The longer the period with TMJ ankylosis, the more serious the deformities of the patients in craniomaxillofacial region.