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为了探讨创伤持续时间与牙髓、牙周组织变化间的关系，作者对４４只大鼠的下颌磨牙制造了实验性创伤，利用组织病理学和软射线的研究方法，观察不同实验期受创伤大鼠磨牙的牙髓、牙周组织变化，并与软射线片进行对照分析。结果表明，牙髓组织随创伤时间延长而病变逐渐加重；牙周组织受到长期创伤后呈现适应性变化，牙周组织的病变部位与软射线片显示的牙周变化部位相应。本研究结果为创伤性牙髓炎和根尖周炎的病因、病理提供了实验依据。
In order to investigate the relationship between the duration of trauma and the changes of periodontal tissue, the author made experimental trauma on the mandibular molars of 44 rats. By means of histopathology and soft-rays, we observed the effects of different experimental periods The periodontal tissue changes of dental pulp of traumatic rat molars were compared with those of soft ray films. The results showed that the pathological changes of dental pulp tissue gradually aggravated with the time of traumatic injury. The periodontal tissues showed adaptive changes after long-term traumatic injury. The lesions of periodontal tissues corresponded to the periodontal changes of soft rays. The results of this study provide experimental evidence for the etiology and pathology of traumatic pulpitis and apical periodontitis.