关键词: 外伤变色牙, 冠内漂白, 受伤时间, 比色仪

Abstract:

Objective    To evaluate the relationship between the injury time of traumatic discolored tooth and the efficacy of intracoronal bleaching. Methods    Choose 90 cases of maxillary incisor discoloration caused by trauma （90 teeth）. The colorimetric method was used to evaluate the changes of the color of the maxillary central incisors before and after the treatment for the discolored teeth by using Olympus Crystalege spectrophotometer. Observe the effect of bleaching treatment in different regions and the average number of visits due to discolored teeth at different time of injury. Results       The impact of duration of trauma on the tooth crown discoloration was not big，and there was no statistically significant difference （P > 0.05）. The appointment number of patients with different injury time was statistically different （P < 0.05）. On 1st and 5th visit，the effectiveness rate of body 1/3 and incisal sites 1/3 were higher than that of cervical 1/3，the difference being statistically significant（P < 0.05）；in body and incisal sites the effect differences had no statistical significance（P > 0.05）. Conclusion    Injury time traumatic discolored teeth is not related to the degree of the tooth crown discoloration. The longer the time of injury，the more the number of return visits. In trauma discolored teeth，the effective of intracoronal bleaching in body 1/3 and incisal sites 1/3 is better than that of cervical 1/3.

Key words: traumatic discolored teeth, coronal bleaching, time of injury, colorimeter