II級1部不正咬合患者における顆部の動きと椎間板の位置との関係

[Relationship between condyle movement and disc position in patients with Class II division 1 malocclusion].

抄録

目的:

2級1号不正咬合患者の顆部の動きと顎関節症との関係を検討する。

OBJECTIVE: To investigate the relationship between condyle movement and temporomandibular disorders (TMD) in patients with Class II division 1 malocclusion.

研究方法:

治療前のII級1部不正咬合の患者20名（11歳から12歳）を対象とした。CADIAX（Computer Aided Diagnosis Axiograph）とMRI（Magnetic Resonance Image）を用いて，円板変位群と正常群の顆頭の動きを分析した．

METHODS: 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.

結果:

椎間板変位患者のopen/close processに感度の高い値が見られた。Y [左: (0.32 +/- 0.10) mm, 右: (-0.91 +/- 0.49) mm ], Z [左: (4.20 +/- 0.70) mm, 右: (3.44 +/- 0.21) mm], 矢状顆の傾斜 (SCI) [左: (32.48 +/- 7.70) 度 , 右: (33.47±12.60）度]と水平顆頭傾斜角（TCI）[左：-2.60±2.02）度、右：-9.23±5.58）度]であり、これらの項目は両群間で有意な差を示した。

RESULTS: 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.

おわりに:

最大開閉プロセスにおける顆部の動きのサイドシフトが、椎間板の変位を誘発している可能性がある。顆部の動きの変化は、機能的治療の早期段階で有用な情報を与えることが明らかになった。

CONCLUSIONS: 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.