Objective Evaluation of the discoloration of traumatized deciduous teeth using the laser flowmeter and color difference meter

我们使用色差仪和透射型激光流量计来客观地评价外伤牙的牙冠颜色和牙髓血流的变化。我们的研究结果如下：1）即使采取光学矫正措施，也很难从照片或肉眼诊断牙冠颜色;2）外伤引起的牙冠变色不均匀;3）通过肉眼检查受伤牙齿进行诊断是不合适的，因为大体临床表现与牙冠颜色变化无关;4）牙冠颜色变化先于相应的放射学表现; 5）X线表现的改变与牙冠颜色的改变有关，6）变色牙可发生褪色或恢复原冠颜色，7）尖牙和其他牙冠表面曲率较大的牙齿测量误差较大; 8）色差计的改进使得能够评估深层组织的颜色，但与浅层组织的结果没有明显的差异。激光流量计：9）在其他方法无法测量的情况下，可以在创伤后立即进行测量;10）该技术在评估牙髓活力方面非常有效;11）探针的改进改善了可操作性; 12）在测量值中观察到轻微的日内变化;13）乳牙根部的状况对产生的波形没有影响;14）恒牙根部的状况产生了产生的波形的差异;15）流量测量结果受牙冠厚度和牙髓形态的影响;16）患者合作对于获得稳定的测量值至关重要。

We used a color difference meter and transmission-type laser flowmeter to objectively evaluate changes in crown color and pulpal blood flow in traumatized teeth. The following is a summary of our findings.Using the color difference meter :1) It is difficult to diagnose crown color from photographs or with the naked eye, even when optical corrective measures are taken ;2) Trauma-induced crown discoloration is not uniform ;3) Diagnosis by visual inspection of the injured tooth is inappropriate because gross clinical findings are not correlated with changes in crown color ;4) Changes in crown color precede the corresponding radiological manifestations ;5) Alterations in radiological findings were associated with changes in crown color ;6) Descolorization and restoration of original crown color may occur for discolored teeth ;7) Measurement error is appreciable for the canines and other teeth with steep curvature of the crown surface ;8) Modification of the color difference meter enabled the color of deep tissue to be assessed, but no major differences from the findings for shallow tissue were evident.With the laser flowmeter :9) Measurements can be made immediately post-trauma in cases where it is not possible by other means ;10) The technique is extremely effective in assessing pulp vitality ;11) Modification of the probe led to improved operability ;12) Slight intraday variations are seen in measured values ;13) The condition of the roots of deciduous teeth had no influence on the waveforms produced ;14) The condition of the roots of permanent teeth yielded differences in the waveforms produced ;15) Flowmetry findings are affected by crown thickness and pulp morphology ;16) Patient cooperation is essential for obtaining stable measurements.