Quantitative Evaluation Of Waveone And Single-file ProTaper F2with Different Rotation Modes On Apical Extrusion In Vitro

Objective: To compare the amounts of apically extruded debris and irrigants from mesialcanals of mandibular molars and the preparation times using WaveOne and single-fileProTaper F2with continuous rotation and reciprocation movement in vitro.Methods:36mandibular first molars were randomly divided into four groups (n=9teethper group). The mesial canals were instrumented using routine WaveOne reciprocatingmode and continuous ProTaper F2mode for both WaveOne Primary files and ProTaper F2files. The equal volume of5.25%sodium hypochloride was used as irrigant for each canal.The apically extruded debris and irrigants were collected in preweighted receptor tubes.After drying, the mean weight of debris and crystals was assessed with a microbalance.Meanwhile, the preparation time for each canal was recorded.Results: The amount of apical extrusions generated by WaveOne Primary file withcontinuous rotation was the most. No significant difference was noted between differentinstruments and different motions. The time required to prepare the canals with thereciprocating WaveOne Primary file was the shortest. The preparation time was significantly shorter in reciprocation groups than in continuous movement groups (P<0.05).Instrumentation was significantly faster using WaveOne Primary file than single-fileProTaper F2(P<0.05).Conclusions:1. The four single-file techniques designed in present study caused apical extrusionwith no significant difference, no matter the instrument types (WaveOne Primary file orsingle-file ProTaper F2) or rotation modes (continuous rotation or reciprocationmovement).2. The reciprocating technique was more efficient for the root canal shaping thancontinuous rotation technique, and WaveOne Primary file was more efficient thansingle-file ProTaper F2.