De-Deus G, Arruda T E P, Souza E M, Neves A, Magalhães K, Thuanne E, Fidel R A S
Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil.
Int Endod J. 2013 Oct;46(10):993-8. doi: 10.1111/iej.12091. Epub 2013 Apr 6.
To assess the frequency in which the Reciproc instrument reaches the full working length (FWL) of mandibular molar canals without a glide path.
From a pool of mandibular molars, 253 root canals were classified as straight (G1) and, 249 root canals as moderately curved (G2) following Schneider's method. A R25 Reciproc instrument (VDW, Munich, Germany) was advanced in the canals without any previous glide path. All cases where Reciproc instruments reached the FWL were classified as 'Reaching the FWL' (RFWL). When the FWL was not reached by the R25, the root canals were classified as 'Not Reaching the FWL' (NRFWL). Pearson's χ(2) test compared (i) the frequency distributions of root canals classified as RFWL and NRFWL for each group and (ii) the frequency distributions of NRFWL canals between the groups.
In G1, 9 cases (3.56%) and in G2, 23 canals (9.34%) were classified as NRFWL. The difference between NRFWL and RFWL was significant in both groups (P = 0.00, χ(2) = 217.2 for G1; P = 0.00, χ(2) = 167.8 for G2). The frequency of NRFWL was significantly higher for G2 (P = 0.02, χ(2) = 5.452).
The R25 Reciproc instrument is able to reach the FWL of straight- and moderate-curved mandibular molar canals without a glide path in a large proportion of cases.
评估在没有引导通路的情况下，Reciproc器械到达下颌磨牙根管全长工作长度（FWL）的频率。
按照施奈德方法，从一批下颌磨牙中，将253个根管分类为直根管（G1），249个根管分类为中度弯曲根管（G2）。使用R25 Reciproc器械（德国慕尼黑VDW公司）在根管中推进，事先不做任何引导通路。所有Reciproc器械到达FWL的病例分类为“到达FWL”（RFWL）。当R25器械未到达FWL时，根管分类为“未到达FWL”（NRFWL）。采用Pearson卡方检验比较（i）每组中分类为RFWL和NRFWL的根管频率分布，以及（ii）两组之间NRFWL根管的频率分布。
在G1组中，9例（3.56%），在G2组中，23个根管（9.34%）被分类为NRFWL。两组中NRFWL和RFWL之间的差异均具有统计学意义（G1组：P = 0.00，χ² = 217.2；G2组：P = 0.00，χ² = 167.8）。G2组的NRFWL频率显著更高（P = 0.02，χ² = 5.452）。
在大部分情况下，R25 Reciproc器械能够在没有引导通路的情况下到达直的和中度弯曲的下颌磨牙根管的FWL。
