A Study on the Mandibular Movements in the Patients with TMJ Lock Closed

악관절 폐구성 과두걸림 환자의 하악운동에 관한 연구

  • Ji-Won Lee (Dept. of Oral Diagnosis and Oral Medicine, School of Dentistry, Seoul National University) ;
  • Sung-Chang Chung (Dept. of Oral Diagnosis and Oral Medicine, School of Dentistry, Seoul National University)
  • Published : 1991.06.01

Abstract

The author examined the patterns and various ranges of mandibular movements in TMJ lock closed patients in the frontal, sagittal and horizontal plane and obtained the following results. 1. In the frontal trajectory, the mean amount of maximum mouth opening was 24.4mm and the opening paths were deviated to the affected side in 87.1% of the patients. The mean amount of maximum laterotrusion to the affected side was 10.4mm and that of non-affected side was 7.5mm. There was a significant difference between them(p<0.001). 2. In the sagittal trajectory, the mean amount of the maximum protrusion was 7.0mm, the mean amount of the maximal retrusion was 1.0mm 3. In the horizontal trajectory, the pattern of laterotrusion showed asymmetry: the mean length of non-affected side was smaller than that of the affected side. Protrusive path were deviated to the affected side in 64.5% of the patients, the mean degree of deviation was 16.4$^{\circ}$. The mandibular movements of TMJ lock-closed patients can be characterized by decreased range of mouth opening, protrusive movement, and laterotrusive movement to the non-affected side and also characterized by deviated opening and protrusive path to the affected side.

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