Arnold J W, Rueggeberg F A, Anderson R W, Weller R N, Borke J L, Pashley D H
Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia, Augusta 30912-1244, USA.
J Endod. 1997 Nov;23(11):663-8. doi: 10.1016/S0099-2399(97)80397-4.
This study determined the disintegration of fast-set SuperEBA cement using ANSI/ADA Specification No. 30 (Spec #30) as well as modifications in pH, osmolarity, time before immersion, and duration of immersion that mimic the clinical, endodontic application of this material. After immersion intervals of 24 h, 1 wk, 1 m, 3 m, or 6 m, specimens were desiccated and weighed. The preimmersion and postdehydration weights were obtained to the nearest 1.0 mg and the percent weight loss from preimmersion levels was calculated. Adjusting the osmolarity to the physiologic level of 300 mOsm/kg resulted in significantly less weight loss (p < 0.05) than the control group in distilled water (no modification of Spec #30). The pH of the storage solution was found to be a significant factor in weight loss. As the acidity and the time of immersion increased, the weight loss also significantly increased with the greatest weight loss of 19.81% at pH 5.5 after 6 m storage. Immersion within 10 min of mixing was not significantly different (p > 0.05) in weight from the control of 1 h set-time. The 24 h weight loss measurements for the pHs of 5.5 and 6.4 were greater than the 1.5% allowed by Spec #30. All other 24 h measurements were less than the 1.5%.
本研究使用美国国家标准学会/美国牙科协会第30号规范（规范#30）以及对pH值、渗透压、浸泡前时间和浸泡持续时间的调整来测定速凝型超EBA水门汀的崩解情况，这些调整模拟了该材料在临床牙髓病学中的应用。在浸泡24小时、1周、1个月、3个月或6个月的间隔时间后，将样本干燥并称重。获取浸泡前和脱水后的重量，精确到最接近的1.0毫克，并计算相对于浸泡前水平的重量损失百分比。将渗透压调整到生理水平300 mOsm/kg，导致重量损失显著低于蒸馏水对照组（未对规范#30进行修改）（p < 0.05）。发现储存溶液的pH值是重量损失的一个重要因素。随着酸度和浸泡时间的增加，重量损失也显著增加，在pH值为5.5且储存6个月后，最大重量损失为19.81%。混合后10分钟内浸泡的重量与1小时凝固时间的对照组相比无显著差异（p > 0.05）。pH值为5.5和6.4时24小时的重量损失测量值大于规范#30允许的1.5%。所有其他24小时测量值均小于1.5%。
