Journal of Prevention and Treatment for Stomatological Diseases ›› 2017, Vol. 25 ›› Issue (4): 239-244.doi: 10.12016/j.issn.2096-1456.2017.04.008

• Cinical Study • Previous Articles     Next Articles

MRI study of temporomandibular joint disc position in asymptomatic volunteers

Pin ZHOU(), Yang-fei LI   

  1. Stomatology Hospital of Lianyungang, First People's Hospital of Lianyungang, Lianyungang 222000, China
  • Received:2016-06-29 Revised:2016-09-12 Online:2017-04-20 Published:2018-09-03

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Abstract:

Objective To investigate the position of temporomandibular joint and its relationship with gender and side in asymptomatic volunteers by magnetic resonance imaging (MRI). Methods The study was based on bilateral MRIs of 30 asymptomatic volunteers, including 15 females and 15 males. A total of 60 temporamandibular joints were scanned oblique-sagittally and oblique-coronarily at mouth closed positions. Classification of the position of temporomandibular joint disc was identified and analyzed according to MRI. Results Superior disk position was observed in 45 joints (75%), consisting of 20 in female plus 25 in male, and 23 at the right side plus 22 at the left side. Anterior disk position was observed in 7 joints (11.67%), consisting of 5 in female plus 2 in male, and 5 at the right side plus 2 at the left side. Lateral disk position was observed in 6 joints (10%), consisting of 3 in female plus 3 in male, and 2 at the right side plus 4 at the left side. Medial disk position was observed in 2 joints (3.33%), consisting of 0 in female plus 2 in male, and 0 at the right side plus 2 at the left side. No posterior disk position was observed in asymptomatic volunteers. There was no significant difference between genders or sides (P> 0.05). Conclusion Superior disk positionexists in most of asymptomatic volunteers. Disc displacement also existsin asymptomatic volunteers, however it is not associated with gender and side. Rotational anterolateral positon is the main type of disc displacement in asymptomatic volunteers.

Key words: Magnetic resonance imaging, Temporomandibular joint disc, Temporomandibular joint, Condyle, Disc position

CLC Number: 

  • R782

Table 1

Criteria of classification of disc positions"

类型 斜矢状位MRI 斜冠状位MRI
正位 关节盘后带后缘在各个层面均位于12点 关节盘在所有层面中位于髁突内外极的中央
前移位 关节盘后带后缘在多个层面位于12点之前 关节盘在所有层面中位于髁突内外极的中央
外侧前移位 关节盘后带后缘在外侧（远中）层面位于12点之前 关节盘在所有层面中位于髁突内外极的中央
内侧前移位 关节盘后带后缘在内侧（近中）层面位于12点之前 关节盘在所有层面中位于髁突内外极的中央
前外侧旋转移位 关节盘后带后缘在多个层面位于12点之前 关节盘向外侧移位
前内侧旋转移位 关节盘后带后缘在多个层面位于12点之前 关节盘向内侧移位
外侧移位 关节盘后带后缘在各个层面均位于12点 关节盘向外侧移位
内侧移位 关节盘后带后缘在各个层面均位于12点 关节盘向内侧移位
后移位 关节盘后带后缘在多个层面位于12点之后 关节盘居中或向内/外侧移位

Figure 1

Superior disk position"

Figure 2

Anterior disk displacement"

Figure 3

Partial anterior disk displacement in lateral part of joint"

Figure 4

Partial anterior disk displacement in medial part of joint"

Figure 5

Rotational anterolateral disk displacement"

Figure 6

Rotational anteromedial disk displacement"

Figure 7

Lateral disk displacement"

Figure 8

Medial disk displacement"

Figure 9

Posterior disk displacement"

Table 2

Distribution of disc position at mouth closed position n（%）"

类型 男性 女性 右侧 左侧 合计
正位 25（41.67） 20（33.33） 23（38.33） 22（36.67） 45（75）
前移位 0（0） 1（1.67） 1（1.67） 0（0） 1（1.67）
外侧前移位 2（3.33） 2（3.33） 2（3.33） 0（0） 4（6.67)
内侧前移位 0（0） 2（3.33） 2（3.33） 2（3.33） 2（3.33）
前外侧旋转移位 2（3.33） 3（5） 2（3.33） 3（5） 5（8.33）
前内侧旋转移位 2（3.33） 0（0） 0（0） 2（3.33） 2（3.33）
外侧移位 1（1.67） 0（0） 0（0） 1（1.67） 1（1.67）
内侧移位 0（0） 0（0） 0（0） 0（0） 0（0）
后移位 0（0） 0（0） 0（0） 0（0） 0（0）
合计 32 28 30 30 60

Table 3

Combined categories of disc position at mouth closed position n（%）"

类型 女性 男性 右侧 左侧 合计
正位 20（33.33） 25（41.67） 23（38.33） 22（36.67） 45（75）
前移位 5（8.330 2（3.33） 5（8.33） 2（3.33） 7（11.67）
外侧移位 3（5） 3（5） 2（3.33） 4（6.67） 6（10）
内侧移位 0（0） 2（3.33） 0（0） 2（3.33） 2（3.33）
后移位 0（0） 0（0） 0（0） 0（0） 0（0）
合计 28 32 30 30 60（100）
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