Detection of interproximal demineralized lesions on human teeth in vitro using frequency-domain infrared photothermal radiometry and modulated luminescence

摘要: Frequency-domain photothermal radiometry (FD-PTR or PTR) is used to detect mechanical holes and demineralized enamel in the interproximal contact area of extracted human teeth. Thirty-four teeth are a series experiments. Preliminary tests created by dental burs 37% phosphoric acid etching for 20 s on points show distinct differences signal. Interproximal areas using partially saturated acidic buffer system. Each sample pair examined with PTR before after micromachining treating at sequential treatment periods spanning 6 h 30 days. Dental bitewing radiographs showed no sign lesion even samples treated Microcomputer tomography (µ-CT), transverse microradiography (TMR), scanning electron microscopy (SEM) analyses performed. Although µ-CT TMR measured mineral losses depths, only SEM surface images visible signs because minimal extent demineralization. However, amplitude increased more than 300% 80 treatment. Therefore, shown have sufficient contrast detection very early lesions. The technique further exhibits excellent signal reproducibility consistent changes presence lesions, attributes that could lead as reliable probe demineralization Modulated luminescence also simultaneously, but it shows lower ability these