骨源性(crossbites of skeletal origin) ： 因下颌发育过度(mandibular excess)引起 的前牙反牙合，除表现前牙反牙合外，明显的 存在下颌骨畸形的表现，下颌体长、下颌角钝 ，颏部明显前突，磨牙关系为近中。
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建议在前牵矫治结束后应采取积极措施限制下颌过度发育，防止复发。
To prevent the recurrence, it is suggested that we should take active measures to restrict the over growth of mandible.
结论舌下腺过度发育并超越下颌舌骨肌及该肌的发育薄弱等因素均可诱发本病发生；
All patients were cured by surgical operations. Conclusion The excessive development of the sublingual gland and the developing defect of mylohyoid muscle should result in …
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