前牙开牙合 apertognathia of anterior teeth ; anterior open bite
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方法：244例牙髓炎患牙随机分二组，分别从牙合面和牙颈部开髓完成干髓术，比较疗效。
Methods: 244 teeth with pulpitis were randomly divided into two groups and then mummification of dental pulp were performed through occlusal surface or cervical surface.
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