The influence of unilateral disc displacement without reduction of temporomandibular joint on condylar height in juvenile

Abstract

Abstract: PURPOSE：To evaluate the influence of unilateral temporomandibular joint anterior disc displacement without reduction on condylar height in juvenile patients during its natural course with quantitative measurement based on MRI. METHODS: The study collected 124 juvenile patients diagnosed with unilateral disc displacement without reduction and followed-up with MRI from January 2010 to June 2013,including 101 females and 23 males, with the mean age of 16.4 years and mean follow-up interval of 13.6 months. The disc length, displacement distance and condylar height were measured quantitatively on MRI. The difference was statistically analyzed with SAS 9.13 software package. RESULTS: The results showed that the mean displacement distance increased from 5.44 mm to 6.83 mm (P<0.05); The mean disc length of the affected sides reduced from 9.06 mm to 8.12 mm (P<0.05); The mean condylar height of the healthy sides increased from 26.07 mm to 26.82 mm (P<0.05); The mean condylar height of the affected sides reduced from 24.22 mm to 23.81 mm (P<0.05); The difference of condylar height between healthy and affected sides increased from 1.85 mm to 3.00 mm (P<0.05). CONCLUSIONS: During the natural course of temporomandibular joint unilateral disc displacement without reduction in juvenile, the organic disease tended to progress, which might finally contribute to maxillofacial abnormalities.

Key words: Juvenile, Temporomandibular Joint, Anterior disc displacement, Natural course, Condylar height, MRI

CLC Number:

R782.6

ZHUO Zi-ang, XIE Qian-yang, YANG Chi, CAI Xie-yi. The influence of unilateral disc displacement without reduction of temporomandibular joint on condylar height in juvenile[J]. China Journal of Oral and Maxillofacial Surgery, 2015, 13(3): 226-231.

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