Sol-gel as methodology to obtain bioactive materials

Abstract

We employed the sol-gel methodology to obtain a silica matrix modified with calcium and phosphate ions. We prepared the matrix by hydrolysis and condensation of the precursors triethyl phosphate, calcium nitrate, and tetraethylorthosilicate, which were the sources of phosphate, calcium, and silicon, respectively. We dried and heat-treated the samples at 110 or 900°C and placed them in simulated body fluid (SBF) for three days. We conducted scanning electron microscopy, x-ray diffraction, and infrared spectroscopy analyses, which evidenced that the sample treated at 110°C contained calcium phosphate silicate and hydroxyapatite before and after contact with SBF, respectively. The sample treated at 900°C exhibited a hydroxyapatite phase before and after contact with SBF, but the crystalline phase was more evident after the contact. In conclusion, the sol-gel methodology provided bioactive samples for bone regeneration.

Chemistry and Bioactivity of NeoMTA Plus™ versus MTA Angelus® Root Repair Materials

“…Weak bands for the sulfate group (calcium sulfate anhydrate) were detected at 1153 and 661 cm −1 [7,[23][24][25] (Figure 1(a)). FTIR spectra of liquids of both investigated root repair materials showed the presence of a broad band at ≈3300 cm −1 corresponding to the -OH group of water molecules [19,20,26]. They also had weak bands at 2900-2800 cm −1 assigned to the CH 2 group [14,27] and bands at 1637 cm −1 assigned to the -OH bending mode of absorbed water [17] and overlapped the C = O group [17].…”

“…The intense band at 1120 cm −1 , assigned to v3 vibration of sulfates (SO 4 2− ) [5,15,23], overlapped the band of SiO 4 2− vibration [5,20]. Asymmetric stretching vibration of phosphate (PO 4 3− ) was identified at 600 cm −1 [19,26]. A weak band at ≈940 cm −1 , assigned to symmetric stretching of silicate [17] and overlapping PO 4 , was detected in liquid of both materials [17,28] (Figure 1(a)).…”

Morphological and chemical analysis of surface interaction of irrigant‐endosequence root repair material

“…Considering the BC putty, if material immersed in NaOCl, the spectra showed humping of OH and CO bands at 2,360 and 2,331 cm −1 respectively (Su, Lu, & Hu, 2010), development of sulphate band (SO 4 2− ) at 1,150 cm −1 and 665 cm −1 (Taddei et al, 2011), shoulder of v 3 phosphate at 1,095 cm −1 (Ylmén et al, 2009). While material immersed in CHX, the spectra revealed humping of aliphatic CH bands at 3,000–2,800 cm −1 (Ribeiro et al, 2014) and NH band at 1,650 cm −1 (Lohar, Patil, Yeligar, & Patil, 2016), development of v CN band at 1,249 cm −1 (Călinescu, Negreanu‐Pirjol, Călinescu, & Georgescu, 2012).…”

Morphological and Spectroscopic Study of an Apatite Layer Induced by Fast-Set Versus Regular-Set EndoSequence Root Repair Materials

“…The spectra were characterized by the presence of intense carbonate bands (calcite or aragonite) at 1412 and 873 cm −1 [6,12,20]; however, these bands were more intense in the EndoSequence regular-set paste than in fast-set putty. The ν3 PO 4 3− bands at 1060 and 1027 cm −1 [14,15,30] were also broad in the regular-set paste, and weak in the fast-set putty. The ν3 of polymerized silicate hydrate at 990 cm −1 [31], alite at 935 and 930 cm −1 [21,25,31], aluminate phase at 745 and 655 cm −1 [25,32], and calcium silicate hydrate at 506 and 445 cm −1 [6,21] was also detected for both materials.…”