Dhillon Navitinder, Chan Kenneth H, Yang Vincent B, Fried Daniel
University of California, San Francisco, San Francisco, CA 94143-0758.
Proc SPIE Int Soc Opt Eng. 2019 Feb;10857. doi: 10.1117/12.2512938. Epub 2019 Feb 28.
It is challenging to identify demineralized areas of root lesions due to cervical erosion, calculus formation, and heavy staining of dentin. We have found that root caries can be imaged with extremely high contrast at short wavelength IR (SWIR) wavelengths beyond 1500-nm. Lasers are well suited for the selective removal of caries lesions from tooth surfaces. A CO laser operating at a wavelength of 9.3-μm was combined with a thulium-doped fiber laser operating at 1880-nm for the selective removal of root caries lesions from extracted teeth. Serial SWIR reflectance images at 1880-nm were used to guide the CO laser for image-guided laser ablation. Cross polarization optical coherence tomography (CP-OCT) was used to assess the initial depth of the lesions before removal and assess the volume of sound and demineralized tissue removed by the CO laser. With this image-guided approach, we believe we can achieve highly selective lesion removal and minimal damage to surrounding sound tissues.
由于宫颈糜烂、牙结石形成和牙本质重度染色，识别根部病变的脱矿区域具有挑战性。我们发现，在超过1500纳米的短波长红外（SWIR）波长下，可以以极高的对比度对根龋进行成像。激光非常适合从牙齿表面选择性去除龋损。将波长为9.3微米的CO激光与波长为1880纳米的掺铥光纤激光相结合，用于从拔除的牙齿中选择性去除根龋损。利用1880纳米处的系列SWIR反射图像来引导CO激光进行图像引导激光消融。交叉偏振光学相干断层扫描（CP-OCT）用于评估去除前病变的初始深度，并评估CO激光去除的健康组织和脱矿组织的体积。通过这种图像引导方法，我们相信可以实现高度选择性的病变去除，并对周围健康组织造成最小的损伤。
