中文摘要：

光学相干断层成像术（OCT）是20世纪90年代出现的一种非创伤性的对透明与半透明的表层生物组织结构成像的技术。近年来，OCT在口腔医学领域进行了深入的研究，可用于检测口腔软硬组织早期病变的表层结构改变，尤其是对较为隐匿、常规临床诊断技术难以发现的充填体下早期继发龋的检测与诊断具有独到之处。从OCT技术的原理与相关研究进展、继发龋的病因与诊断、OCT检测牙修复体周围早期继发龋的成像观察、继发龋病变危险因素的监测等方面进行了简要综述，证明OCT技术是一项很有潜力的继发龋早期诊断技术。

英文摘要：

Optical coherence tomography （OCT） which was brought into existence in early 90s of 20 century is a noninvasive technique for creating cross-sectional images of transparent or semi-transparent internal biological tissue structure. In recent years applicability research in the field of stomatology has made great progress. The micro structure changes of surface layer of the lesions in oral hard and soft tissues could be detected by this technique, with its unique feature to detect insidious secondary caries beneath dental restorations that couldn＇t be found by current clinical techniques easily. In this review,secondary caries etiopathogenisis and diagnosis, prin- ciple were discussed firstly and then imaging observation of OCT to detect early second caries around dental restoration and monitoring on risk factors inducing secondary caries are reviewed. It indicated that OCT technique has great potential on diagnosis of secondary caries.