Yeung Priscilla, Liewehr Frederick R, Moon Peter C
Virginia Commonwealth University, Richmond, 23298, USA.
J Endod. 2006 May;32(5):456-9. doi: 10.1016/j.joen.2005.08.008.
This study compared the fill density of mineral trioxide aggregate (MTA) produced by hand condensation with that produced by hand condensation with indirect ultrasonic (US) activation. Sixty acrylic blocks with straight or curved canals were instrumented to an apical size 45, and weighed with a digital electronic balance. In 30 randomly chosen specimens, the canal was filled with MTA by hand condensation and weighed. The MTA was removed; the canal was rinsed and dried, and refilled using hand condensation with indirect US activation. In the other 30 specimens, the procedure was carried out identically but in reverse order. The blocks were then reweighed. The weight of the MTA fill produced by the two placement methods in the two canal configurations was analyzed by a two-way ANOVA. Hand condensation with indirect US activation resulted in an MTA fill that was statistically significantly heavier, and thus denser, than that accomplished by hand condensation alone in both curved and straight canals (p < 0.0001).
本研究比较了手工加压与间接超声（US）激活下手工加压制备的三氧化矿物凝聚体（MTA）的充填密度。将60个具有直根管或弯根管的丙烯酸树脂块预备至根尖尺寸45，并使用数字电子天平称重。在随机选择的30个标本中，通过手工加压用MTA充填根管并称重。去除MTA；冲洗并干燥根管，然后使用间接US激活的手工加压重新充填。在另外30个标本中，以相同的方式进行操作，但顺序相反。然后再次对树脂块称重。通过双向方差分析比较两种根管形态下两种充填方法所产生的MTA充填物的重量。在弯根管和直根管中，间接US激活的手工加压所产生的MTA充填物在统计学上显著更重，因此也更致密（p < 0.0001），比仅通过手工加压完成的充填物更重。
