J Korean Acad Conserv Dent.  2005 Mar;30(2):95-101. 10.5395/JKACD.2005.30.2.095.

Effect of canal tapering in teeth of various apical size & cross-sectional configuration on microleakage

• Kim JH
• Lee KH
• Lee SJ
• Yu MK
• Lee KW

• KMID: 1987001
• DOI: http://doi.org/10.5395/JKACD.2005.30.2.095

Abstract

The aim of this study was to evaluate the microleakage of teeth according to root canal preparation with & without apical enlargement in various size of apical foramen. 60 extracted one canal roots were cross-cutted at 5 mm from root apex and divided into two groups according to their apical foramen size of large (L) and small (S). Each group was subdivided into two groups accordance with their cross-sectional configuration at 5 mm from apex, round (R) and ovoid (O); SR Group, SO Group, LR Group, LO Group. Each group was shaped in .02 taper by Quantec series Nickel-Titanium (NiTi) rotary file, obturated by lateral condensation method. Leakage was measured using a fluid transport model under 40 cmH2O pressure. After the leakage test, blocks which had showed the leakage retreated with .04 taper and .06 taper and evaluated the degree of fluid filtration in each group. The data was analysed statistically using chi-square test and fisher's exact test. The results obtained were as follows: 1. Significant difference in leakage was found in groups which had different apical foramen size in .02 taper instrumentation (p < 0.05), but not in .04 taper instrumentation (p > 0.05). 2. The difference in microleakage according to the shape of canal was not evident at 5 mm from apex (p > 0.05). 3. There was correlation between .02 taper instrumentation and .04 taper instrumentation in LR group , LO group (p < 0.05).

Keyword

Fluid filtration; Apical size; Cross sectional configuration; Taper

MeSH Terms

Filtration
Root Canal Preparation
Tooth Apex
Tooth*

Figure

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  Figure 1 Cross-sectional configuration at 5 mm from root apex (A : long diameter, B : short diameter)

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  Figure 2 Schematic diagram of fluid filtration method

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  Figure 3 Difference of leakage in groups which had .02 taper insrumentation (*p < 0.05)

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  Figure 4 Difference in leakage of each group between .02 taper and .04 taper (*p < 0.05)

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