Department of Dentistry-Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Campus João David Ferreira Lima, Trindade, Florianópolis, SC, Brazil.
Department of Periodontics and Endodontics, University at Buffalo, New York, NY, USA.
Odontology. 2024 Apr;112(2):537-545. doi: 10.1007/s10266-023-00846-5. Epub 2023 Aug 29.
This study evaluated changes in the root canal length (RCL) and the accuracy of the electronic apex locator (EAL) during the different stages of endodontic treatment and retreatment. Fifty-six mesial root canals of mandibular molars were selected. The actual root canal length (AL) of the canals was obtained by inserting a size 15 hand file up to the apical foramen, under magnification. The electronic lengths were obtained at the "APEX" mark of Root ZX II, using an alginate model. Both measurements were performed at three different stages of the initial root canal treatment-unflared, flared, and concluded-and at two stages of retreatment, after achieving patency and repreparation. Data were statistically analyzed and the significance level established was 5%. All stages produced a significant reduction in the AL (p < 0.05). The greatest variation was observed between the unflared-flared stages (0.2 mm) and between concluded-patency stages (0.09 mm), with no difference between them (p > 0.05). The accuracy of Root ZX II was negatively affected after achieving patency, presenting statistically significant difference compared to the other stages (p < 0.05). A significant reduction in the RCL was observed along the different stages of endodontic treatment and retreatment. The EAL was accurate to measure the root canals in most stages, except after achieving patency for endodontic retreatment. Determining and monitoring the RCL is an essential step towards a favorable prognosis, since it reduced along the different stages evaluated. Root ZX II was not accurate for endodontic retreatment.
本研究评估了在根管治疗和再治疗的不同阶段根管长度（RCL）和电子根尖定位仪（EAL）的准确性变化。选择了 56 颗下颌磨牙的近中根管。通过将尺寸为 15 的手用锉插入根尖孔，在放大倍数下获得根管的实际根管长度（AL）。在 Root ZX II 的“APEX”标记处使用藻酸盐模型获得电子长度。在初始根管治疗的三个不同阶段（未扩口、扩口和完成）以及再治疗的两个阶段（达到通畅性和重新预备后）进行了这两种测量。对数据进行了统计分析，设定的显著性水平为 5%。所有阶段的 AL 均显著降低（p<0.05）。未扩口-扩口阶段（0.2 毫米）和完成-通畅阶段（0.09 毫米）之间的变化最大，两者之间无差异（p>0.05）。达到通畅性后，Root ZX II 的准确性受到负面影响，与其他阶段相比存在统计学差异（p<0.05）。在根管治疗和再治疗的不同阶段，RCL 显著降低。EAL 在大多数阶段测量根管是准确的，除了再治疗达到通畅性之后。确定和监测 RCL 是获得良好预后的重要步骤，因为它在评估的不同阶段都会降低。Root ZX II 不适用于根管再治疗。
