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后牙萌出不足可产生后牙开验。作者对原发性萌出不足的可能原因与治疗作了讨论。后牙萌出不足主要由于1.萌出机制与牙周韧带结构异常。2.牙萌出一部份后又停止萌出,可能是由于局部血循环供血不足。此外,机械干扰一舌、软组织压力大于萌出力,多余牙、乳牙根或齿槽骨未吸收以及粘连等对后牙萌出不足也有影响。自身萌出机制紊乱的后牙开验对正畸治疗无反应。Cahill用钢丝将小狗的磨牙拴结在下颌下缘上,发现上面的骨与牙均有吸收,牙不萌出,但当去除拴结时牙萌出快于正常。对猞牙缺失后牙齿继续萌出,说明萌出停止很长时间后萌出的机制仍然存在,是由
Eruption of posterior teeth can produce posterior teeth experience. The authors discuss the possible causes and treatment of primary ecthyma. Posterior teeth eruption is mainly due to 1. Eruption mechanism and periodontal ligament structure abnormalities. 2. Eruption part of the eruption and then stop, probably due to insufficient blood supply to the local blood circulation. In addition, a mechanical interference, soft tissue pressure is greater than the eruption force, extra teeth, deciduous teeth root or alveolar bone is not absorbed and adhesions on the eruption of the posterior teeth also have an impact. Eruption mechanism dysplasia of the posterior teeth test did not respond to orthodontic treatment. Cahill wire the puppy molars tied to the lower edge of the mandible and found that the above bone and teeth are absorbed, the teeth do not erupt, but when removing the tethered teeth eruption faster than normal. Dental teeth disappeared after eruption, indicating eruption stopped a long time after the eruption of the mechanism still exists, is caused by