Effect of Canal Length and Curvature on Working Length Alteration with WaveOne Reciprocating Files
Elio Berutti, MD, DDS,* Giorgio Chiandussi, MS, PhD,† Davide Salvatore Paolino, MS, PhD,† Nicola Scotti, DDS,* Giuseppe Cantatore, MD,‡ Arnaldo Castellucci, MD, DDS,§
and Damiano Pasqualini, DDS*
and Damiano Pasqualini, DDS*
Introduction: This study evaluated the working length (WL) modification after instrumentation with WaveOne Primary (Dentsply Maillefer, Ballaigues, Switzerland) reciprocating files and the incidence of overinstrumenta- tion in relation to the initial WL. Methods: Thirty-two root canals of permanent teeth were used. The angles of curvature of the canals were calculated on digital radio- graphs. The initial WL with K-files was transferred to the matched WaveOne Primary reciprocating files. After glide paths were established with PathFile (Dentsply Maillefer, Ballaigues, Switzerland), canals were shaped with Wave- One Primary referring to the initial WL. The difference between the postinstrumentation canal length and the initial canal length was analyzed by using a fiberoptic inspection microscope. Data were analyzed with a balanced 2-way factorial analysis of variance (P < .05). Results: Referring to the initial WL, 24 of 32 Wave- One Primary files projected beyond the experimental apical foramen (minimum–maximum, 0.14–0.76 mm). A significant decrease in the canal length after instrumen- tation (95% confidence interval ranging from 0.34 mm to 0.26 mm) was detected. The canal curvature signif- icantly influenced the WL variation (F1 = 30.65, P < .001). The interaction between the initial canal length and the canal curvature was statistically significant (F2 = 4.38, P = .014). Conclusions: Checking the WL before prepa- ration of the apical third of the root canal is recommended when using the new WaveOne NiTi single-file system. (J Endod 2011;37:1687–1690)
Key Words
Nickel-titanium, reciprocating motion, WaveOne, working length
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