Various experimental and in vivo studies have reported that resin infiltration inhibits the progression of carious lesions and increasingly recommended it for clinical use. Resin infiltration has been proposed as one of several minimal invasive caries treatments of non-cavitated carious lesions without sacrificing dental hard tissue. In recent years, caries pattern has changed and the traditional restorative dentistry model is changing towards less invasive approaches. Clinical significanceĪctive acid application before resin infiltration is recommendable. Optical coherence tomography provides information about the process and degree of resin infiltration. Resin infiltration can be increased by optimizing the etching process. The early enamel carious lesion was completely infiltrated by the resin whereas infiltration of the advanced enamel carious lesion was incomplete and inhomogeneous. Using OCT, the process of resin penetration into the carious lesion body became visible. Resultsĭuring the etching process, numerous bubbles formed on the lesion surface. The image sequences for etching and infiltration were viewed in time lapse. Teeth were sectioned through the ROIs and section layers were imaged by scanning electron microscopy in order to compare with the OCT images. During each treatment step and after light curing of the infiltrant, the ROIs were imaged again by SD-OCT. Lesions were infiltrated (Icon, DMG) according to the manufacturer’s instructions. One region of interest (ROI) per tooth was marked by two drill-holes in occlusal-cervical direction. The non-cavitated carious lesions (ICDAS code 2) of four visually preselected extracted human molars and premolars were verified as enamel lesions by micro computed tomography (μCT). Visualisation of the etching process and resin penetration at white spot carious lesions by spectral domain optical coherence tomography (SD-OCT).
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