Journal of Biomedical OpticsCharacterization of the effects of postextraction treatments on human dentin-resin interface by micro-Raman spectroscopy
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Raman microprobe spectroscopy was used to investigate the effects of post-extraction treatments of human dentin on the penetration of the 4-methacryloxyethyl trimellitic acid (4-MET)/methyl methacrylate (MMA)/ tri-n-butyl borane (TBB) dentin adhesive. Human molar teeth, extracted and stored in distilled water or 70% ethanol solution for 7 or 28 days, were treated with the resin. Spatially resolved Raman microspectroscopy was used to measure penetration. The band intensity ratio 1612 cm-1 (resin): 962 cm-1 (dentin) was used as a diagnostic. Diffusion of the resin into dentin increased with the length of storage period. The results indicate that the effects of postextraction treatments on teeth must be considered when laboratory measurements of bonding strengths are employed to predict the clinical performance of dental cements. In addition, it is demonstrated that Raman microprobe spectroscopy is a feasible analytical tool to evaluate the effects of postextraction treatments on teeth.