中文摘要：

早期龋齿是由牙齿内部脱矿造成的,脱矿区导致后向散射系数增加。提出一种通过光学相干层析（OCT）检测早期龋齿的方法,通过研制的全光纤OCT系统对人离体牙齿进行成像,获得了正常人离体牙齿的二维断层图像,并采用酸蚀法对人正常离体牙齿分别进行了12,24,48,72,96和120 h人工体外龋齿建模,使用全光纤OCT系统对人工龋齿脱矿程度进行定量测量,测量结果满足人工致龋深度与人工致龋时间之间的线性关系,验证了通过采用OCT方法定量测量牙齿脱矿程度来检测早期龋齿的可行性。

英文摘要：

Early dental caries is caused by demineralization of the teeth, which results in the increasing backscattered coefficient of the lesion area. In the paper, a method is proposed for detecting early caries by using optical coherence tomograpby （OCT）. The two dimensional tomography images of the human teeth in vitro are obtained by using the development all fiber OCT system. Artificial caries model is made by chemical etching on the human teeth in vitro for 12, 24, 48, 72, 96 and 120 h, respectively. Using the OCT system, the level of demineralization is obtained quantitatively and the measurement data are obtained with different artificial time. The result shows that the depth of the artificial caries has the linear relationship with time. It is proved that OCT has the feasibility by detecting the level of demineralization for early caries diagnosis.