Akisue Eduardo, Gratieri Simone Domingues, Barletta Fernando Branco, Caldeira Celso Luiz, Grazziotin-Soares Renata, Gavini Giulio
Department of Endodontics, School of Dentistry, Universidade Santa Cecilia, Santos, São Paulo, Brazil.
Private practice, São Bernardo do Campo, São Paulo, Brazil.
J Endod. 2014 Jan;40(1):109-12. doi: 10.1016/j.joen.2013.09.032. Epub 2013 Oct 25.
Electronic working length measurement during root canal treatment in teeth with enlarged apical foramina is a challenge. The aims of this in vitro study were (1) to assess the influence of foramen widening on the accuracy of 5 different electronic foramen locators (EFLs) and (2) to compare the accuracy of EFLs in different foramen sizes.
The following EFLs were used: MiniApex, Root ZXII, iPex, Propex II, and Elements Apex Locator. Each EFL was used in 3 groups (n = 20) of extracted teeth, with foramen diameters of 0.27 mm (G27), 0.47 mm (G47), and 0.72 mm (G72). Working length was measured according to manufacturer's instructions and compared with visual measurements (control method). Results were classified as accurate (equal or differences ≤ 0.05 mm) or inaccurate (differences > 0.5 mm).
In G27, all EFLs yielded accurate findings (intragroup reliability; Fisher exact test, P < .05), compared with only MiniApex, Root ZXII, and Elements Apex Locator in G47 and G72. MiniApex, Root ZXII, and Elements Apex Locator were similarly accurate regardless of foramen size. iPex and Propex II were the least accurate among the devices tested, and foramen diameter influenced their accuracy, with greater diameters yielding poorer EFL performance.
Foramen diameter did not influence the accuracy of MiniApex, Root ZXII, and Elements Apex Locator EFLs. iPex and Propex II showed decreased accuracy as foramen size increased.
在根尖孔扩大的牙齿进行根管治疗时，电子工作长度测量是一项挑战。本体外研究的目的是：（1）评估根尖孔扩大对5种不同电子根尖定位仪（EFL）准确性的影响；（2）比较不同根尖孔大小情况下EFL的准确性。
使用以下EFL：MiniApex、Root ZXII、iPex、Propex II和Elements Apex Locator。每种EFL在3组（每组n = 20）拔除的牙齿中使用，根尖孔直径分别为0.27毫米（G27组）、0.47毫米（G47组）和0.72毫米（G72组）。根据制造商的说明测量工作长度，并与视觉测量（对照方法）进行比较。结果分为准确（相等或差异≤0.05毫米）或不准确（差异>0.5毫米）。
在G27组中，所有EFL均得出准确结果（组内可靠性；Fisher精确检验，P < 0.05），而在G47组和G72组中只有MiniApex、Root ZXII和Elements Apex Locator得出准确结果。无论根尖孔大小如何，MiniApex、Root ZXII和Elements Apex Locator的准确性相似。在测试的设备中，iPex和Propex II最不准确，根尖孔直径影响其准确性，直径越大，EFL性能越差。
根尖孔直径不影响MiniApex、Root ZXII和Elements Apex Locator EFL的准确性。随着根尖孔尺寸增加，iPex和Propex II的准确性降低。
