Tanomaru-Filho Mario, Morales Vanessa, da Silva Guilherme F, Bosso Roberta, Reis José M S N, Duarte Marco A H, Guerreiro-Tanomaru Juliane M
Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University (UNESP), 14801-385 Araraquara, SP, Brazil.
ISRN Dent. 2012;2012:898051. doi: 10.5402/2012/898051. Epub 2012 Aug 23.
Objective. The aim of this study was to evaluate the compressive strength and setting time of MTA and Portland cement (PC) associated with bismuth oxide (BO), zirconium oxide (ZO), calcium tungstate (CT), and strontium carbonate (SC). Methods. For the compressive strength test, specimens were evaluated in an EMIC DL 2000 apparatus at 0.5 mm/min speed. For evaluation of setting time, each material was analyzed using Gilmore-type needles. The statistical analysis was performed with ANOVA and the Tukey tests, at 5% significance. Results. After 24 hours, the highest values were found for PC and PC + ZO. At 21 days, PC + BO showed the lowest compressive strength among all the groups. The initial setting time was greater for PC. The final setting time was greater for PC and PC + CT, and MTA had the lowest among the evaluated materials (P < 0.05). Conclusion. The results showed that all radiopacifying agents tested may potentially be used in association with PC to replace BO.
目的。本研究旨在评估与氧化铋（BO）、氧化锆（ZO）、钨酸钙（CT）和碳酸锶（SC）相关的MTA和波特兰水泥（PC）的抗压强度和凝结时间。方法。对于抗压强度测试，在EMIC DL 2000仪器中以0.5毫米/分钟的速度对试件进行评估。对于凝结时间的评估，使用吉尔摩型针分析每种材料。采用方差分析和Tukey检验进行统计分析，显著性水平为5%。结果。24小时后，PC和PC + ZO的值最高。在21天时，PC + BO在所有组中显示出最低的抗压强度。PC的初凝时间更长。PC和PC + CT的终凝时间更长，而MTA在所评估的材料中终凝时间最短（P < 0.05）。结论。结果表明，所有测试的射线不透性剂都有可能与PC联合使用以替代BO。
