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由于轻微的外伤,如碰撞或打击引起牙髓创伤后,髓腔可能闭合。这种结果很像根管充填,但这种情况根管是由异种钙化物质充满的。已有作者研究过狗的牙髓对机械创伤的反应,将其双根前磨牙的近中根切除1/2,血液仅能经远中根供应残存牙髓,整个牙髓腔可能在3—4个月内显著变窄和闭锁。临床上也可看到,在上颌窦根治术后,手术侧的上双尖牙存留而牙髓无活力,X片可证实髓腔闭锁。作者曾对一年青病员的前牙在再植术后14天进行了组织学检查,以观察牙槽内创伤后牙髓中硬组织形成的过程。从该牙齿纵剖面可看到牙齿的发育和病
The medullary cavity may close due to minor trauma, such as a collision or a blow, that causes trauma to the pulp. This result is much like root canal filling, but in this case the root canal is filled with heterogeneous calcified material. The author has studied the dog's dental pulp response to mechanical trauma, the proximal root of its double root premolar excision 1/2, the blood can only be supplied via the distal root pulp, the entire pulp cavity may be 3-4 Significant narrowing and occlusion during the month. Clinical can also be seen in the maxillary sinus surgery, the surgical side of the bicuspid on the teeth without residual pulp, X-piece can confirm the medullary atresia. The authors conducted a histological examination of the anterior teeth of a young patient 14 days after replantation to observe the formation of hard tissue in the dental pulp after the trauma in the alveolus. Dental development and disease can be seen from the longitudinal section of the tooth