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

• Milagros Martín-Micó ^[1] ; Leopoldo Forner-Navarro ^[2] ; Amelia Almenar-García ^[2]
  1. [1] Universidad CEU Cardenal Herrera

     Universidad CEU Cardenal Herrera

     Valencia, España

     
  2. [2] Universitat de València

     Universitat de València

     Valencia, España

     
• Localización: Medicina oral, patología oral y cirugía bucal. Ed. inglesa, ISSN-e 1698-6946, Vol. 14, Nº. 3 (March), 2009
• Idioma: inglés
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• Resumen

  • 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 image 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.