Influence of dental resin material composition on cross-polarization-optical coherence tomography imaging

Abstract

Abstract. The purpose of this study was to investigate cross-polarization-optical coherence tomography (CP-OCT) signal attenuation through different resin material compositions. Four distinct composite systems were used: Filtek supreme ultra (FSU) (3M ESPE), IPS empress direct (EMD) (Ivoclar Vivadent), estelite sigma quick (SQK) (Tokuyama Dental), and Z100 (3M ESPE). Cross-sectional images of different composite-demineralized phantoms (n ¼ 108) were collected using a 1310-nm intraoral cross-polarization swept source OCT (CP-OCT) imaging system. %T quantified the CP-OCT signal attenuation. Scanning electron microscopy, transmission electron microscopy, and energy-dispersive x-ray spectrometer chemical analysis was utilized to determine how different matrix/filler compositions affected attenuation of the near infrared (NIR) signal. CP-OCT imaging of dental resin composites showed enormous variation in signal attenuation. For each of our composite systems, there was not a consistent attenuation difference in the NIR signal for A to D shades. The four composites had similar measured backscattering values but attenuated the overall signal to different degrees. When comparing the A2 shades between the four different composite systems, the order of highest to lowest of %T was EMD > Z100, FSU > SQK (ANOVA, Tukey, p < 0.0001). As a result, we demonstrate the importance of understanding how the constituents of composite materials affect CP-OCT signal attenuation.

Optical coherence tomography for evaluation of enamel and protective coatings

“…Nevertheless, in CXT and PBC that showed higher thickness, DEJ was occasionally masked. In this regard, it was shown that the composition of resin materials affected the OCT signal pattern 24) . In addition it is difficult to detect the DEJ beneath the demineralization in some images of UC area, due to a very low signal intensity from the structure.…”

“…It is a promising imaging modality, which does not require cutting and processing of the specimens and allows the visualization of microstructures of tissues and biomaterials in real time 24) . Recently, clinical OCT systems equipped with hand-held probes and suitable for intra-oral imaging have been launched by some manufacturers on a trial basis and showed a potential as a detecting tool for occlusal, interproximal and secondary caries, demineralization around orthodontic brackets as well as evaluation of dental materials defects [25][26][27][28] .…”

Secondary caries and microleakage

“…However, it remains to be resolved how to proceed in practice to take into account the vast variation of refractive indices of different resin composites as a function of their filler content and particle size distributions [62].…”

Effect of a calcium phosphate and fluoride paste on prevention of enamel demineralization

“…Optical coherence tomography (OCT) is addressed as a technology which enables cross-sectional imaging of internal biological structures without the use of X-ray irradiation in a short time 10,11) . It is a promising imaging modality, which does not require cutting and processing of the specimens and allows visualization of the microstructures of tissues and biomaterials almost in real time 12) . As for clinical dental applications so far, OCT has been used to observe structures of caries, crack, fracture, restoration integrity and so on 13) .…”