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Abstract
The purpose of this study was to evaluate the canal configuration after shaping by ProFile, ProTaper and K-Flexofile in simulated resin canals with different angles of curvature.
Three types of instruments were used : ProFile, ProTaper, K-Flexofile. Simulated root canals, which were made of epoxy resin, were prepared by ProFile, ProTaper with rotary instrument using a crown-down pressureless technique, and hand instrumentation was performed by K-Flexofile using a step-back technique. All simulated canals were prepared up to size 25 file at end-point of preparation. Pre and post instrumentation images were recorded with Scanner. Assessment of canal shape was completed with Image Analysis program. Measurements were made at 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 mm from the apex. At each level, outer canal width, inner canal width, total canal width, and amount of transportation from original axis were recorded. Instrument deformation and fracture were recorded. Data were analyzed by means of one-way ANOVA analysis of variance and the Sheffe's test.
The result was that ProFile and ProTaper maintain original canal shape regardless of the increase of angle of curvature than K-Flexofile. ProFile show significantly less canal transportation and maintained original canal shape better than ProTaper.
Figures and Tables
 | Figure 1The three different angles of curvature (by Schneider method).
Working length was adjusted to 18 mm, the beginning point of curvature was began at 10 mm from the canal orifice.
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 | Figure 2A diagram is indicating the points at which the canal widths were measured after superimposition of preinstrumentation and postinstrumentation images.
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Table 1
Mean values of outer, inner, total canal width and amount of transportation in 15 degree of canal curvature (Unit: mm, Mean ± S.D.)
Table 2
Mean values of outer, inner, total canal width and amount of transportation in 30 degree of canal curvature (Unit: mm, Mean ± S.D.)
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