Modification of the working length after rotary instrumentation. A comparative study of four systems

ABSTRACT

Objective: To determine variation in post-instrumentation working length and root area in the following rotary systems ProTaper, RaCe, Mtwo and K3. Study design: A sample of 40 resin blocks with double curvature (at 14 and 16 mm) and a 33o angle was used. Working length was verified with a digital measure using a number 10 K file. The specific sequence for each rotary system was followed. The canal was measured between each file, and the variation noted to determine which file showed the greatest variation within a same system and the different systems were compared. 1.5 X pre and post-instrumentation microscopic photographs were taken and measurements of the area were taken with an im- age analysis programme. Results: The area was found to increase by the following amounts ProTaper 21.85 mm2; Mtwo 20.16 mm2; K3 17.24 mm2 and RaCe 16.09 mm2. The differences in variation of the working length were ProTaper 0.81 mm; Mtwo 1.07 mm; K3 0.31 mm and RaCe 0.81 mm Conclusions: The values for the variation in working length are clinically not very significant. All the rotary systems analysed showed a tendency to straighten the canal and eliminate the apical curvature, and the ProTaper system was found to produce the greatest modification to the canal area and structure (AU)