Department of Endodontics, School of Dentistry, Santa Cruz do Sul University, Santa Cruz do Sul, RS, Brazil.
Braz Oral Res. 2012 Mar-Apr;26(2):106-11.
The aim of this study was to assess, in vivo, the accuracy of the NovApex® electronic foramen locator in determining working length (WL) in vital and necrotic posterior teeth. The NovApex®was used in 144 canals: 35 teeth with vital pulps (68 canals) and 42 teeth with necrotic pulps (76 canals). WL was measured with the NovApex® locator and confirmed using the radiographic method. Differences between electronic and radiographic measurements ranging between 0.0 and 0.4 millimeters were classified as acceptable; differences equal to or greater than 0.5 millimeter were considered unacceptable. Pearson's chi-square test was used to assess the influence of pulp condition on the accuracy of NovApex®(a = 0.05). Regardless of pulp condition, differences between electronic and radiographic WL measurements were acceptable in 73.61% of the canals. No statistically significant differences in accuracy were observed when comparing vital and necrotic canals (p > 0.05). There were 38 unacceptable measurements. In none of these cases was the file tip located beyond the radiographic apex; in 32, it was located short of the NovApex® measurement. Pulp condition had no significant effect on the accuracy of NovApex®.
本研究旨在体内评估 NovApex®电子根管长度测量仪在确定活髓和坏死后牙工作长度 (WL) 方面的准确性。在 144 个根管中使用了 NovApex®：35 颗有活力牙髓的牙齿（68 个根管）和 42 颗有坏死牙髓的牙齿（76 个根管）。使用 NovApex®定位器测量 WL，并使用放射照相法确认。电子和放射照相测量之间的差异在 0.0 至 0.4 毫米之间被归类为可接受；等于或大于 0.5 毫米的差异被认为是不可接受的。Pearson 卡方检验用于评估牙髓状况对 NovApex®准确性的影响（a = 0.05）。无论牙髓状况如何，在 73.61%的根管中，电子和放射照相 WL 测量之间的差异是可接受的。在比较活髓和坏死根管时，准确性没有统计学差异（p > 0.05）。有 38 个不可接受的测量值。在这些情况下，没有一个文件尖端位于放射照相根尖之外；在 32 个情况下，它位于 NovApex®测量值的短端。牙髓状况对 NovApex®的准确性没有显著影响。
