J Korean Acad Conserv Dent.  2007 Mar;32(2):87-94. 10.5395/JKACD.2007.32.2.087.

A study on transportation of apical foramen after overinstrumentation by ProFile(R), ProTaper(TM) and K3TM in simulated canals with different curvatures

• Yang H
• Yang IS
• Hwang YC
• Hwang IN
• Yoon SJ
• Kim WJ
• Oh WM

• KMID: 2175841
• DOI: http://doi.org/10.5395/JKACD.2007.32.2.087

Abstract

This study was done to evaluate transportation of the apical foramen after 0.5 mm overinstrumentation by ProFile, ProTaper and K3 in simulated resin root canal. Sixty simulated resin root canal with a curvature of J and S-shape were divided into two groups. Each group consisted of three subgroups with 10 blocks according to the instruments used: ProFile(R), ProTaper(TM), and K3TM. Simulated resin root canal was prepared by ProFile, ProTaper and K3 with 300 rpm by the crown-down preparation technique. Pre- and post-instrumentation apical foramen images were overlapped and recorded with Image-analyzing microscope 100X (Camcope, Sometech Inc, Korea). The amounts of difference in width and dimension on overlapped images were measured after reference points were determined by Image Analysis program (Image-Pro(R) Express, Media Cybernetic, USA). Data were analyzed using Kruskal-Wallis and Mann-Whitney U-test. The results suggest that ProFile showed significantly less canal transportation and maintained original apical foramen shape better than K3 and ProTaper.

Keyword

ProFile; ProTaper; K3; Simulated J and S-shape canal

MeSH Terms

Cybernetics
Dental Pulp Cavity
Tooth Apex*
Transportation*

Figure

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  Figure 1 A and B diagrams indicate inner and outer side of canal curvature.

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  Figure 2 Procedure measuring the difference in width and dimensions of apical foramen. A. Measurement of difference in width of apical foramen after overlapping pre- and post-instrumentation images. (L1; Δ mesial width, L2; Δ outer width, L3; Δ distal width, L4; Δ inner width) B. Measurement of difference in dimensions of apical foramen after overlapping pre- and post-instrumentation images. (a; inner dimensions of apical foramen before instrumentation, b; outer dimensions of apical foramen before instrumentation, c; inner dimensions of apical foramen after instrumentation, d; outer dimensions of apical foramen after instrumentation)

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  Figure 3 ΔOuter width of apical foramen between pre- and post-instrumentation according to the types of files and curvatures.

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  Figure 4 ΔInner width of apical foramen between pre- and post-instrumentation according to the types of files and curvatures.

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  Figure 5 ΔOuter dimensions of apical foramen between pre- and post-instrumentation according to the types of files and curvatures.

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  Figure 6 ΔInner dimensions of apical foramen between pre- and post-instrumentation according to the types of files and curvatures.

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