Dental Materials and Biomaterials Laboratory Faculty of Stomatology, Meritorious Autonomous University of Puebla.
X-Ray Laboratory, Materials Research Institute, National Autonomous University of México.
J Oral Sci. 2023;65(2):141-147. doi: 10.2334/josnusd.22-0449.
To evaluate the effect of adding wollastonite and bioactive glass to an experimental mineral trioxide aggregate-like cement (MTA) on the dimensional stability, compressive strength, solubility, bioactivity, and marginal adaptation by scanning electron microscopy (SEM) and X-ray diffraction (XRD).
Four groups were evaluated at 7, 14, and 21 days: MTA Angelus, experimental MTA-like cement (MTA Exp), BG10 (MTA Exp+10 wt% bioactive glass), and WO20 (MTA Exp+20 wt% wollastonite). To evaluate marginal adaptation, extracted teeth were endodontically obturated and root-end cavities were prepared and filled with the tested materials.
Cements with bioactive materials showed minimal dimensional changes. Adding wollastonite or bioactive glass to MTA Exp reduces the compressive strength but does not affect solubility. Bismite (BiO), larnite (CaSiO), calcite (CaCO) and carbonated hydroxyapatite (Ca[PO,CO][OH]) were identified in the four cements; ettringite (CaAl[SO][OH]·26HO) and bismutite ([BiO]CO) were only observed in MTA Exp, BG10, and WO20. Cement-dentin interfaces were not observed after 14 days on the BG10 and WO20 cement composites due to the ettringite formation.
Acicular growing crystals typical of hydroxyapatite were found on the surfaces of all cements. An improved marginal adaptation was observed with the addition of wollastonite or bioactive glass.
通过扫描电子显微镜（SEM）和 X 射线衍射（XRD）评估在实验性矿化三氧化物聚合体样水泥（MTA）中添加硅灰石和生物活性玻璃对尺寸稳定性、抗压强度、溶解度、生物活性和边缘适应性的影响。
在第 7、14 和 21 天评估了 4 组：MTA Angelus、实验性 MTA 样水泥（MTA Exp）、BG10（MTA Exp+10wt%生物活性玻璃）和 WO20（MTA Exp+20wt%硅灰石）。为了评估边缘适应性，将提取的牙齿进行根管填充，并制备根端腔并用测试材料填充。
含有生物活性材料的水泥显示出最小的尺寸变化。在 MTA Exp 中添加硅灰石或生物活性玻璃会降低抗压强度，但不会影响溶解度。在四种水泥中均鉴定出了斜硅钙石（BiO）、硅灰石（CaSiO）、方解石（CaCO）和碳酸羟基磷灰石（Ca[PO，CO][OH]）；仅在 MTA Exp、BG10 和 WO20 中观察到硫铝酸钙（CaAl[SO][OH]·26HO）和铋酸铋（[BiO]CO）。由于硫铝酸钙的形成，BG10 和 WO20 水泥复合材料在第 14 天观察到水泥-牙本质界面不存在。
在所有水泥的表面都发现了典型的羟基磷灰石的针状生长晶体。添加硅灰石或生物活性玻璃可改善边缘适应性。
