Mathew Abhishek Isaac, Lee Silvia Chamin, Rossi-Fedele Giampiero, Bogen George, Nagendrababu Venkateshbabu, Ha William Nguyen
Adelaide Dental School, University of Adelaide, Adelaide, SA 5000, Australia.
School of Dentistry, University of Queensland, Brisbane, QLD 4072, Australia.
Materials (Basel). 2021 Jun 7;14(11):3126. doi: 10.3390/ma14113126.
This study aimed to compare the density of mineral trioxide aggregate (MTA) as a root canal filling material in the apical 5 mm of artificial root canals. Forty transparent acrylic blocks with 30-degree curved canals were instrumented and allocated into four compaction technique groups ( = 10): Lawaty (hand files); gutta-percha (GP) points; auger (nickel-titanium rotary files in reverse mode); and plugger technique. Filled canals were weighed after setting the MTA to calculate difference in mass. Two postoperative radiographs compared radiopacity by measuring luminance variations at 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm from the root apex. Obturation time was measured using a digital chronometer. The significance level was set to < 0.05. The plugger group had a lower mass. Relative luminance was significantly higher for the Lawaty group than the plugger group at all examined apical levels. The relative luminance of the auger and GP groups were significantly higher than the plugger group at depths between 0.5 mm and 2 mm. Relative luminance was highest for the Lawaty technique at all depths between 0.5 mm and 4 mm. The Lawaty technique group was associated with increased obturation time compared with pluggers. Compacting MTA in curved canals with the Lawaty technique has the highest mass and radiopacity but requires more time.
本研究旨在比较作为根管充填材料的三氧化矿物凝聚体（MTA）在人工根管根尖5 mm处的密度。对40个带有30度弯曲根管的透明丙烯酸树脂块进行预备，并分为四种压实技术组（每组n = 10）：Lawaty法（手动锉）；牙胶尖（GP）；螺旋钻法（反向模式的镍钛旋转锉）；以及充填器技术。在MTA凝固后对充填的根管进行称重，以计算质量差异。术后拍摄两张根尖片，通过测量距根尖0.5 mm、1 mm、2 mm、3 mm、4 mm和5 mm处的亮度变化来比较X线阻射性。使用数字计时器测量充填时间。显著性水平设定为P < 0.05。充填器组的质量较低。在所有检查的根尖水平，Lawaty组的相对亮度均显著高于充填器组。在0.5 mm至2 mm深度之间，螺旋钻法组和牙胶尖组的相对亮度显著高于充填器组。在0.5 mm至4 mm的所有深度，Lawaty技术的相对亮度最高。与充填器相比，Lawaty技术组的充填时间增加。采用Lawaty技术在弯曲根管中压实MTA具有最高的质量和X线阻射性，但需要更多时间。
