Kells B E, Kennedy J G, Biagioni P A, Lamey P J
School of Dentistry, Queen's University of Belfast, Belfast, UK.
Int Endod J. 2000 Sep;33(5):448-62. doi: 10.1046/j.1365-2591.2000.00236.x.
To investigate the rewarming pattern and rewarming rate of clinically healthy teeth following a controlled cold stimulus using TI techniques.
A controlled cold stimulus was developed using an air stream at 20 degrees C. Gingival and incisal sites on 12 healthy maxillary lateral incisors in six patients were imaged under rubber dam following 20 s cooling. Images were captured at 10 s intervals during a 3-min rewarming period and the data used to construct graphs of the rewarming rate. Log transformation of the data was used to produce 'best fit' straight line graphs. Linear regression analysis was used to examine three variables, viz. the side of the mouth (right or left), the site of measurement (gingival or incisal) and the phase of rewarming (early 0-90 s, late 91-180 s).
The mean temperature change (delta t degree C) during rewarming was 8.5 degrees C (SD 1.0 degree C) for gingival sites and 7.2 degrees C (SD 1.1 degrees C) for incisal sites. The slope of the 'best fit' straight line data enabled a rewarming index to be calculated for each site on each tooth. Linear regression analysis showed that the phase of rewarming was highly significant but the other variables were not. A one-way ANOVA showed no significant differences between or within groups.
Three min is an appropriate time to record rewarming of teeth cooled for 20 s with an airstream at 20 degrees C. The side or site used to record surface temperatures using this technique is not significant. Rewarming is exponential and log transformation of the data produces a well-fitting straight line graph. The slope of this line provides a rewarming index which should enable comparison of TI and laser Doppler flowmetry in determining pulpal blood flow as a measure of tooth vitality.
运用热成像（TI）技术，研究临床健康牙齿在可控冷刺激后的复温模式及复温速率。
利用20摄氏度的气流形成可控冷刺激。6名患者的12颗健康上颌侧切牙在橡皮障隔离下，经20秒冷却后，对牙龈和切缘部位进行成像。在3分钟的复温期内，每隔10秒采集一次图像，并将数据用于构建复温速率图。对数据进行对数转换以生成“最佳拟合”直线图。采用线性回归分析来检验三个变量，即口腔侧（右侧或左侧）、测量部位（牙龈或切缘）以及复温阶段（早期0 - 90秒、晚期91 - 180秒）。
复温过程中，牙龈部位的平均温度变化（Δt，单位：摄氏度）为8.5摄氏度（标准差1.0摄氏度），切缘部位为7.2摄氏度（标准差1.1摄氏度）。“最佳拟合”直线数据的斜率使每颗牙齿上每个部位的复温指数得以计算。线性回归分析表明，复温阶段具有高度显著性，而其他变量则不然。单因素方差分析显示组间及组内均无显著差异。
3分钟是记录经20摄氏度气流冷却20秒的牙齿复温情况的合适时间。使用该技术记录表面温度时，所采用的口腔侧或部位并无显著影响。复温呈指数形式，对数据进行对数转换可生成拟合良好的直线图。该直线的斜率提供了一个复温指数，这应有助于在确定牙髓血流作为牙齿活力指标时，比较热成像技术和激光多普勒血流仪。
