Garcia Lucas da Fonseca Roberti, Chinelatti Michelle Alexandra, Rossetto Hebert Luis, Pires-de-Souza Fernanda de Carvalho Panzeri
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
J Endod. 2014 Feb;40(2):261-5. doi: 10.1016/j.joen.2013.07.010. Epub 2013 Aug 31.
The aim of this study was to evaluate the solubility and disintegration of EndoBinder (EB) containing 3 different radiopacifying agents, bismuth oxide (Bi2O3), zinc oxide (ZnO), or zirconium oxide (ZrO2), in comparison with gray mineral trioxide aggregate (GMTA) and white MTA (WMTA).
Ten specimens of each cement were made in a stainless steel matrix (20 × 1.5 mm) according to Specification no. 57 of American National Standards Institute/American Dental Association: EB + Bi2O3, EB + ZrO, EB + ZnO, WMTA, and GMTA. The specimens were weighed on an accurate analytical scale and immersed in 50 mL distilled and deionized water at 37°C for 7 days. Afterwards, specimens were dried and weighed again to determine mass loss (%). Resulting solutions were analyzed in an atomic absorption spectrophotometer for identification and quantification of chemical elements released.
All cements presented mean values of solubility and disintegration above the American National Standards Institute/American Dental Association Specification no. 57. EB + Bi2O3 presented the lowest mass loss (5.08%) and WMTA (6.65%) the highest, with no statistically significant difference (P > .05). The release of several chemical elements was observed, mostly metal ions. Only GMTA and EB + Bi2O3 showed the presence of Cr, with significant difference (P < .05). EB + ZnO presented the highest levels of Pb, followed by WMTA (P < .05). For As, the cements presented different release levels, with EB + ZnO showing the highest and GMTA the lowest levels (P < .05). However, the amounts of As and Pb released were lower than the safe limit proposed by ISO 9917-1.
Irrespective of the radiopacifying agents used, EndoBinder presented similar behavior to MTA.
本研究的目的是评估含有3种不同射线阻射剂（氧化铋（Bi2O3）、氧化锌（ZnO）或氧化锆（ZrO2））的EndoBinder（EB）与灰色矿物三氧化物聚合体（GMTA）和白色MTA（WMTA）相比的溶解性和崩解性。
根据美国国家标准学会/美国牙科协会第57号规范，在不锈钢模具（20×1.5毫米）中制作每种水门汀的10个样本：EB + Bi2O3、EB + ZrO、EB + ZnO、WMTA和GMTA。在精确的分析天平上对样本称重，然后将其浸入37°C的50毫升蒸馏水和去离子水中7天。之后，将样本干燥并再次称重以确定质量损失（%）。对所得溶液在原子吸收分光光度计中进行分析，以鉴定和定量释放的化学元素。
所有水门汀的溶解性和崩解性平均值均高于美国国家标准学会/美国牙科协会第57号规范。EB + Bi2O3的质量损失最低（5.08%），WMTA（6.65%）最高，两者无统计学显著差异（P >.05）。观察到有几种化学元素释放，主要是金属离子。只有GMTA和EB + Bi2O3显示有Cr存在，有显著差异（P <.05）。EB + ZnO的Pb含量最高，其次是WMTA（P <.05）。对于As，不同水门汀呈现不同的释放水平，EB + ZnO最高，GMTA最低（P <.05）。然而，As和Pb的释放量低于ISO 9917-1提出的安全限值。
无论使用何种射线阻射剂，EndoBinder的表现与MTA相似。
Zotero 插件