How effectively do hydraulic calcium silicate cements re mineralize demineralized dentin.
OBJECTIVE To characterize the chemical interplay and to quantify the re mineralization potential of hydraulic calcium silicate cements (hCSCs) at demineralized dentin. METHODS Pairs of class I cavities were prepared in non carious human third molars. One dentin cavity was demineralized with 10% formic acid (5h) the other served as control. The cavities were filled with two resin free hCSCs (Biodentine, Septodont; ProRoot MTA, Dentsply Sirona) or one resin based hCSC (TheraCal LC, Bisco) After 1 week, 1 3 and 6 month storage in simulated body fluid (SBF) polished specimen cross sections were chemically characterized using Field emission gun Electron Probe Micro Analysis (Feg EPMA) and micro Raman spectroscopy (mRaman) RESULTS Feg EPMA line scans and elemental mappings confirmed early re mineralization induced by all three hCSCs at 1week. The relative depth and intensity of re mineralization were for the resin free hCSCs in the range of 50.5% 84.8% and 68.1% 89.2% respectively. Re mineralization did not significantly differ for the storage periods (p>0.05) Significantly less re mineralization was achieved by the resin based hCSC TheraCal LC that reached only at 6months a re mineralization level that was no longer significantly different from that achieved by the resin free hCSCs at 1week (p>0.05) Re mineralization of intertubular dentin, including tubular occlusion, was observed; Si was occasionally detected to have infiltrated the dentin tubules. Dentin re mineralization by hCSCs was confirmed using mRaman that revealed an increased phosphate peak at 960cm 1. SIGNIFICANCE hCSCs do re mineralize demineralized dentin. The resin free cements induced re mineralization at a higher speed/intensity than the resin based hCSC. However, re mineralization was incomplete for all hCSCs tested, this even at 6months.
Dental materials official publication of the Academy of Dental Materials