A research of discolaration for traumatized young permanent teeth with measured pulp blood flow by using thermography

有观点认为，创伤牙齿变色意味着不可逆转的牙髓坏死。然而，变色在某些情况下会消失，因此，我们使用色度计进行了颜色分析，测量了牙髓血流量，并确认创伤牙齿的变色是由牙髓坏死或牙髓充血引起的。然而，色度学诊断需要在变色发生后进行连续的颜色测量，而且在受试者不安静休息的情况下不能进行牙髓流变学检测，因此这些方法不适用于临床诊断。为了解决这些问题，本研究进行了非接触式和非侵入性生物测量的热成像技术。热像仪在医学领域中被广泛应用于体表炎症变化的研究。然而，由于特定的口腔内环境散热，它还没有被应用于牙科领域。由于创伤牙齿通常存在于上颌前牙区，口腔内辐射热的影响可以消除。因此，使用一种不受辐射热影响的仪器对创伤牙齿的温度变化进行评估，得到以下结果：1创伤后即刻的温度变化与健康牙齿相比有显著差异(、o)。2、通过常规测量，无论是牙髓坏死牙还是牙髓充血的牙齿，与健康牙齿相比都没有明显的差异。3冷水负荷试验显示，尽管牙髓充血的牙齿表现出与健康牙齿相似的热恢复曲线，但牙髓坏死的牙齿的热恢复延迟。3、。

It has been considered that discoloration of traumatized teeth implies irreversible dental pulp necrosis. However, discoloration disappears in some cases Therefore, we had performed color analysis using a colorimeter, measured pulp blood flow, and confirmed that discoloration of traumatized teeth is caused by either pulp necrosis or pulp hyperemia. However, colorimetrical diagnosis requires continuous color measurement after the occurrence of discoloration, and pulp rheometry cannot be performed when the subjects do not rest quietly; therefore, these methods are not applicable to clinical diagnosis. To solve these problems, thermography for non-contact and non-invasive biometry was performed in this study. Thermography has been widely used for investigating inflammatory changes on the body surface in the medical field. However, it has not been used in the dental field, due to specific intra-oral environment that radiates heat. Since traumatized teeth are generally present in the maxillary anterior tooth region, the influence of intra-oral radiant heat can be eliminated. Therefore, using an apparatus that is not affected by radiant heat, temperature changes in traumatized teeth were evaluated, and the following results were obtained:1、o marked differences in temperature changes were noted between traumatized teeth immediately after injury and the healthy teeth.2、By conventional measurement, no significant differences were noted in either pulp necrosis teeth or pulp hyperemia teeth, compared with the healthy teeth.3、By a cold-water load test, although the pulp hyperemia teeth showed a thermal recovery curve similar to that for the healthy teeth, thermal recovery was delayed in the pulp necrosis teeth.