Single fi le rotary systems are frequently used for preparation root canals due to their speed, single use and decreased contamination possibility, however, fi le fracture is a main problem in these systems. This study assessed the effects of different reciprocating angles and rotary movements on the fracture resistance of OneShape instruments. 150 mesiobuccal and mesiolingual canals of mandibular molars or mesiobuccal and distobuccal canals of maxillary molars having 30-60° curvatures were selected and assigned to 3 groups; OneShape fi les were used with rotary movement, reciprocating movement with 30-150°, reciprocating movement with 30-90° until they will fracture. The time required for canal preparation, the canal's curvatures, the mean length of fractured segments and the mean number of prepared canals with one fi le were measured. In rotary movements, in 8 canals (16.0%) fi les were fractured, while in the reciprocating movement with 30-150 degree and 30-90°; in 6 (12.0%) and 5 (10.0%) canals fi les were fractured, respectively. No signifi cant differences were noted regarding the fracture incidence of 3 groups. The mean time required for canal preparation in OneShape instruments with rotary, reciprocating movements with 30-90 degrees and 30-150 degrees were 31.31±15.83, 62.89±48.87 and 46.5±35.54 seconds, respectively. The preparation time with rotary movements were signifi cantly lower than reciprocating movements with 30-90° (P=0.001). No other signifi cant differences were noted in the paired comparisons. Using OneShape instruments had higher fracture resistance by reciprocating movements with different angles, but it was not signifi cant. The preparation time with rotary movements were signifi cantly lower than reciprocating movements with 30-90°.
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