De-Deus Gustavo, Palhares Guilherme Alves, Silva Emmanuel João Nogueira Leal da, Belladonna Felipe Gonçalves, Oliveira Diogo da Silva, Carvalho Kilber Duarte, Souza Erick Miranda, Versiani Marco Aurélio
Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil.
Department of Endodontics, State University of Rio de Janeiro, Rio de Janeiro, Brazil.
Braz Dent J. 2024 Dec 16;35:e246147. doi: 10.1590/0103-644020246147. eCollection 2024.
This study assessed the impact of pre-enlarging the root canal using a size 25 K-file on the fracture incidence of three reciprocating instruments after multiple uses. After a glide path performed with a size 15 K-file, the instruments (Reciproc R25, Reciproc Blue R25, and WaveOne Gold Primary) were initially used in 936 root canals. Then, for the second and third uses (933 and 927, respectively), a pre-enlargement using a size 25 K-file at the working length was done. Periapical radiographs assessed fragment location and length, and chi-square tests compared observed and expected frequencies (α = 5%). The fracture incidence during reuse ranged from 0% to 0.64%. Reciproc did not fracture during reuse (P = 0.99), but experienced two fractures in the third use (P = 0.000). Reciproc Blue and WaveOne Gold each had one fracture during the second (P = 0.000) and third (P = 0.000) uses. Following a pre-enlargement using a size 25 K-file for the second and third uses in 1,860 canals, only 6 instruments fractured (0.32%), suggesting that this approach may prolong the lifespan of these instruments and serve as an alternative for their reuse with a reduced risk of fracture.
本研究评估了使用25号K锉预扩大根管对三种往复式器械多次使用后折断发生率的影响。在用15号K锉建立引导通路后，这些器械（Reciproc R25、Reciproc Blue R25和WaveOne Gold Primary）最初用于936个根管。然后，在第二次和第三次使用时（分别为933个和927个根管），在工作长度处使用25号K锉进行预扩大。根尖片评估碎片的位置和长度，卡方检验比较观察到的和预期的频率（α = 5%）。重复使用期间的折断发生率为0%至0.64%。Reciproc在重复使用期间未发生折断（P = 0.99），但在第三次使用时发生了两例折断（P = 0.000）。Reciproc Blue和WaveOne Gold在第二次（P = 0.000）和第三次（P = 0.000）使用时各有一例折断。在1860个根管的第二次和第三次使用中采用25号K锉预扩大后，仅有6件器械折断（0.32%），这表明该方法可能会延长这些器械的使用寿命，并可作为降低折断风险的重复使用替代方法。
