Jäggi Marco, Magni Eva, Eggmann Florin, ElAyouti Ashraf, Connert Thomas, Weiger Roland
Department of Reconstructive Dentistry, University Center for Dental Medicine Basel UZB, University of Basel, 4058 Basel, Switzerland.
Department of Periodontology, Endodontology and Cariology, University Center for Dental Medicine Basel UZB, University of Basel, 4058 Basel, Switzerland.
Materials (Basel). 2021 May 15;14(10):2580. doi: 10.3390/ma14102580.
This in vitro study aimed to evaluate apical pressure during irrigant delivery with syringe irrigation in immature teeth with an open apical foramen. Conventional syringe irrigation was performed in a 3D-printed immature incisor. A 5 mL syringe combined with 25 G and 30 G cannulas was used. Open-ended and side-vented needle tip designs were assessed. Cannulas were placed at tooth length (TL), TL -1 mm, TL -2 mm, and TL -4 mm. The syringe plunger was moved with a force of 10 N, 20 N, 40 N, and 80 N to simulate clinical conditions. A pressure sensor measured periapical pressures during irrigation. Each experiment was repeated 10 times. Data were analyzed descriptively (maximum, mean, standard deviation, 95% CI) with the critical threshold indicative of extrusion set at 7.64 mbar. 30 G cannulas with both needle tip designs never exceeded the threshold at any TL with a plunger force of 10-40 N. At 80 N, 30 G open-ended cannulas exceeded the threshold in 10%, 30 G side-vented in 20-60% of the measurements. At any TL, 25 G open-ended cannulas and 25 G side-vented cannulas never crossed the threshold with forces of 10-20 N and 10 N, respectively. Consequently, 30 G cannulas with both designs can be recommended for irrigant delivery in immature teeth. 25 G cannulas ought to be used with caution.
本体外研究旨在评估在根尖孔开放的未成熟牙齿中使用注射器冲洗时的根尖压力。在3D打印的未成熟切牙上进行传统的注射器冲洗。使用一个5 mL注射器与25 G和30 G的套管。评估了开放式和侧孔式针尖设计。将套管放置在牙齿长度（TL）、TL -1 mm、TL -2 mm和TL -4 mm处。以10 N、20 N、40 N和80 N的力移动注射器活塞以模拟临床情况。在冲洗过程中用压力传感器测量根尖压力。每个实验重复10次。对数据进行描述性分析（最大值、平均值、标准差、95%置信区间），将表示挤出的临界阈值设定为7.64毫巴。两种针尖设计的30 G套管在活塞力为10 - 40 N时，在任何牙齿长度处都未超过阈值。在80 N时，30 G开放式套管在10%的测量中超过阈值，30 G侧孔式套管在20 - 60%的测量中超过阈值。在任何牙齿长度处，25 G开放式套管和25 G侧孔式套管在活塞力分别为10 - 20 N和10 N时从未超过阈值。因此，两种设计的30 G套管均可推荐用于未成熟牙齿的冲洗剂输送。25 G套管应谨慎使用。
