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对后牙牙冠的劈裂治疗,过去一直是采取拔除的办法。从八○年以来陆续报导了徐君伍、宋世卿等同志对后牙牙冠劈裂治疗的方法。对此笔者在学习的基础上把后牙牙冠劈裂归纳为三型:一、隐裂型:牙冠(牙合)面、邻面有检查不易发现的裂纹,而冠部未完全裂开。2、斜劈型:牙劈达髓角或髓室壁但未涉及到髓室底者,,斜劈线的断端于牙龈下2—3mm或牙槽嵴下2—3mm。它又进一步可分成劈裂冠的一侧仅与牙龈相连,劈裂牙片易摘除型和劈裂冠两侧均与牙槽骨相连,劈裂的牙片相对稳固型两种。3、纵劈型:凡牙冠劈裂线通过髓室底形成的冠根
The treatment of posterior teeth split crown, the past has been taken to remove. Since eighty years have been reported Xu Junwu, Song Shiqing and other comrades on the posterior teeth crown splitting treatment. In this study, the author based on the study of the posterior tooth crown split into three types: First, the cracked type: crown (occlusal) face, check the surface is not easy to find cracks, and the crown is not completely split. 2, oblique splitting type: Dental pulp pith medullary or medullary wall but not involved in the end of the chamber, the cleft line broken ends 2-3mm below the gums or alveolar ridge 2-3mm. It can be further divided into split the side of the crown is only connected with the gums, easy to remove the splitting type and splitting both sides of the crown are connected with the alveolar bone, splitting the relatively stable two types of teeth. 3, vertical split type: where the crown split line through the pulp chamber crown