Figure 2.

(a) Average micro-Raman spectra recorded on the surface of the BG-PDMS commercial cement (GuttaFlow Bioseal) before (i.e., fresh) and after ageing in HBSS for 28 days alone and in the presence of a commercial GP cone (Roeko), which was maintained in contact with the sealer. The bands assignable to polydimethylsiloxane (pSi), monoclinic zirconia (Z), and apatite (■) are indicated. (b) Raman I₉₇₀/I₆₃₈ intensity ratio (average ± standard deviation) as calculated from the micro-Raman spectra of BG-PDMS reported in part (a). Different letters represent statistically significant differences between values (n = 5, p = 0.0287).