Relationship between condyle movement and disc position in patients with Class II division 1 malocclusion / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the relationship between condyle movement and temporomandibular disorders (TMD) in patients with Class II division 1 malocclusion.</p><p><b>METHODS</b>Twenty patients (from 11 to 12 years old) with Class II division 1 malocclusion before treatment were collected. Computer aided diagnosis axiograph (CADIAX) and magnetic resonance images (MRI) were used to analyze the condyle movement between disc displacement and normal groups.</p><p><b>RESULTS</b>The sensitive values were found in open/close process in patients with disc displacement: Y [Left: (0.32 +/- 0.10) mm, Right: (-0.91 +/- 0.49) mm ], Z [Left: (4.20 +/- 0.70) mm, Right: (3.44 +/- 0.21) mm], sagittal condylar inclination (SCI) [Left: (32.48 +/- 7.70) degrees , Right: (33.47 +/- 12.60) degrees ] and horizontal condylar inclination (TCI) [Left: (-2.60 +/- 2.02) degrees , R: (-9.23 +/- 5.58) degrees ], and those items showed significant difference between two groups.</p><p><b>CONCLUSIONS</b>The side shift of condyle movement in maximum open/close process might be the inducement of disc displacement. It was revealed that the changes in condyle movement could give useful information in early stage of functional treatment.</p>

Relationships between MRI image changes of lateral pterygoid muscle, disc position and condylar mobility in Class II patients / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To analyze the relationships between MRI image changes of lateral pterygoid muscle (LPM), disc position and condylar mobility.</p><p><b>METHODS</b>Twenty Class II patients were chosen and MRI images of LPM were taken. The relationships between MRI image changes of LPM, disc position and condylar mobility were analyzed.</p><p><b>RESULTS</b>The rate of MRI image changes of LPM in Class II patients was about 45%. No significant correlations were found between MRI image changes of LPM, condylar mobility and disc position.</p><p><b>CONCLUSIONS</b>MRI image changes of LPM in Class II patients was common but no significant correlations were found between MRI image changes of LPM, condylar mobility and disc position.</p>