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HOME > Restor Dent Endod > Volume 30(2); 2005 > Article
Original Article Effect of canal tapering in teeth of various apical size & cross-sectional configuration on microleakage
Jung-Hee Kim, Kyung-Ha Lee, Se-Joon Lee, Mi-Kyung Yu, Kwang-Won Lee
2005;30(2):-101.
DOI: https://doi.org/10.5395/JKACD.2005.30.2.095
Published online: March 31, 2005

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Corresponding author: Kwang-Won Lee. Department of Conservative Dentistry, School of Dentistry, Chonbuk National University, 634-18, Geumam-dong, Jeonju, Jeonbuk, Korea, 561-712. Tel: 82-63-250-2119, Fax: 82-63-250-2129, endo@chonbuk.ac.kr
• Received: August 24, 2004   • Revised: January 7, 2005   • Accepted: February 15, 2005

Copyright © 2005 Korean Academy of Conservative Dentistry

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  • 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).
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Figure 1
Cross-sectional configuration at 5 mm from root apex (A : long diameter, B : short diameter)
jkacd-30-95-g001.jpg
Figure 2
Schematic diagram of fluid filtration method
jkacd-30-95-g002.jpg
Figure 3
Difference of leakage in groups which had .02 taper insrumentation (*p < 0.05)
jkacd-30-95-g003.jpg
Figure 4
Difference in leakage of each group between .02 taper and .04 taper (*p < 0.05)
jkacd-30-95-g004.jpg
Table 1
Classification of apical size and canal shape
jkacd-30-95-i001.jpg
Table 2
Rate of leakage in experimental groups

*frequency number / total number

jkacd-30-95-i002.jpg

Tables & Figures

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        Effect of canal tapering in teeth of various apical size & cross-sectional configuration on microleakage
        J Korean Acad Conserv Dent. 2005;30(2):95-101.   Published online March 31, 2005
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      Figure
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      Effect of canal tapering in teeth of various apical size & cross-sectional configuration on microleakage
      Image Image Image Image
      Figure 1 Cross-sectional configuration at 5 mm from root apex (A : long diameter, B : short diameter)
      Figure 2 Schematic diagram of fluid filtration method
      Figure 3 Difference of leakage in groups which had .02 taper insrumentation (*p < 0.05)
      Figure 4 Difference in leakage of each group between .02 taper and .04 taper (*p < 0.05)
      Effect of canal tapering in teeth of various apical size & cross-sectional configuration on microleakage

      Classification of apical size and canal shape

      Rate of leakage in experimental groups

      *frequency number / total number

      Table 1 Classification of apical size and canal shape

      Table 2 Rate of leakage in experimental groups

      *frequency number / total number


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