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- Original Article COMPARISON OF CANAL SHAPING METHODS WITH GT™ ROTARY FILE AND CONDENSATION METHODS
- Yu-Mi Kang, Jeong-Hee Jin, Mi-Kyung Yu, Se-Joon Lee, Kwang-Won Lee
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J Korean Acad Conserv Dent 2002;27(5):-529.
DOI: https://doi.org/10.5395/JKACD.2002.27.5.521
Published online: January 14, 2002
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Copyright © 2002 The Korean Academy of Conservative Dentistry
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract
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The purpose of this study was to compare the shaping time of two shaping methods and the leakage of three different obturation techniques. Ninty three canaled human molar teeth were used, which were randomly divided into two groups of forty teeth each and ten control teeth. After working length determination, the one group was prepared crown-down technique using rotary root canal instruments of GT rotary files .12/20, .10/20, .08/20 and .06/20 taper(Maillefer Instrument SA. Switzerland). The other group was instrumented with Gates Glidden burs(#1, #2, and #3) to coronal preparation and GT rotary files .08/20 and .06/20 taper to apical preparation. Shaping time was measured.After root canals were instrumented, they were divided to three subgroups and obturated as follows: Subgroup 1, obturated with single cone method : Subgroup 2, obturated with lateral condensation : Subgroup 3, obturated with continuous wave technique. Three subgroups were obturated using non-standardized gutta-percha cone(Diadent, Korea, .06 or .08 taper) and AH-26(Dentsply DeTrey, Germany) as a root canal cement.Ten unobturated teeth served as positive and negative controls. After immersion in 2% methylene blue solution for 1 month, the teeth were washed during 24h. The teeth were demineralized in 10% nitric acid and dehydrated by immersion in 80, 90 and 100% ethyl alcohol. The teeth were finally cleared and stored in 100%methylsalicylate, and apical dye penetration was evaluated under stereomicroscope(Leica M420, LC, U.S.A)at ×8.75 magnification.Liner measurement of dye penetration was assessed with the use of digitalized image analysing system (analySIS, GmbH, Germany). The data were analysed statistically using independent T-test and Two-way ANOVA and Tukey test. The result were as follows:
In canal prepared with GT™rotary file, shaphing time taked more than the group of using Gates Glidden drill to coronal preparation without statistical significance (p>0.05).
The group of single cone obturation using canal preparation of GT™ rotary files showed significantly more apical leakage than those of lateral condensation and continuous wave technique regardless of shaping method (p<0.05).
The group of single cone obturation using canal preparation of GT™ rotary files and Gates Glidden drill showed significantly more apical leakage than those of continuous wave technique regardless of shaping method (p<0.05).
Regardless of shaping method, The group of continuous wave obturation showed less apical leakage than those of lateral condensation without statistical significance (p>0.05).
The group of single cone obturation using canal preparation of GT™ rotary files and Gates Glidden drill showed more apical leakage than the group of lateral condensation using same shaping method without statistical significance (p>0.05).
Fig. 1.
Mean dye penetration values for the linear measurement(μm)
* GT : only use GT file
* GGD & GT : after using gates glidden drill, use GT file
Table 1.
Classification of group by canal shaping
| Groups | Root canal shaping method | Number |
|---|---|---|
| A | Canal shaping with GT™ rotary file | 40 |
| B | Canal shaping with G.G.D & GT™ rotary file | 40 |
Table 2.
Classification of group by sealing method & canal shaping
Table 3.
Mean preparation time(second) by canal shaping method
| Group | N | Mean | SD | Minimum | Maximum |
|---|---|---|---|---|---|
| A | 40 | 518.67 | 145.81 | 310 | 1030 |
| B | 40 | 457.45 | 132.21 | 271 | 972 |
Table 5.
Mean dye penetration values for the linear measurement(㎛).
Table 6.
Statistical differences between experimental groups by mean dye penetration(Two-way ANOVA).
| Group | 1 | 4 | 5 | 2 | 3 | 6 |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 4 | NS | |||||
| 5 | * | NS | ||||
| 2 | * | * | NS | |||
| 3 | * | * | NS | NS | ||
| 6 | * | * | NS | NS | NS |
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XML DownloadCOMPARISON OF CANAL SHAPING METHODS WITH GT™ ROTARY FILE AND CONDENSATION METHODS
Fig. 1. Mean dye penetration values for the linear measurement(μm)
Fig. 2. Canal shaping : GT™ file, canal obturation : Single cone
Fig. 3. Canal shaping : GT™ file, canal obturation : Continuous wave obturation
Fig. 4. Canal shaping : G.G.D & GT™file, canal obturation : Single cone
Fig. 5. Canal shaping :G.G.D & GT™file, canal obturation : Lateral condensation
Fig. 6. Canal shaping : GT™file, canal obturation : Continuous wave obturation
Fig. 7. Canal shaping : G.G.D & GT™file, canal obturation : Continuous wave obturation
Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
Fig. 7.
COMPARISON OF CANAL SHAPING METHODS WITH GT™ ROTARY FILE AND CONDENSATION METHODS
| Groups | Root canal shaping method | Number |
|---|---|---|
| A | Canal shaping with GT™ rotary file | 40 |
| B | Canal shaping with G.G.D & GT™ rotary file | 40 |
| Group | Canal shaping method | Canal obturation method | Number |
|---|---|---|---|
| 1 | GT rotary file | Single cone | 11 |
| 2 | GT rotary file | Lateral condensation | 11 |
| 3 | GT rotary file | Continuous wave obturation | 11 |
| 4 | G.G.D & GT rotary file | Single cone | 11 |
| 5 | G.G.D & GT rotary file | Lateral condensation | 11 |
| 6 | G.G.D & GT rotary file | Continuous wave obturation | 11 |
| Group | N | Mean | SD | Minimum | Maximum |
|---|---|---|---|---|---|
| A | 40 | 518.67 | 145.81 | 310 | 1030 |
| B | 40 | 457.45 | 132.21 | 271 | 972 |
| Group | N | Mean | SD | Minimum | Maximum |
|---|---|---|---|---|---|
| 1 | 11 | 1691.66 | 459.86 | 1002.5 | 2356.3 |
| 2 | 11 | 1157.93 | 265.26 | 612.52 | 1559.8 |
| 3 | 11 | 942.75 | 608.00 | 106.36 | 1782.3 |
| 4 | 11 | 1658.95 | 273.13 | 1347.6 | 2055.6 |
| 5 | 11 | 1192.35 | 341.10 | 506.67 | 1657.9 |
| 6 | 11 | 1043.64 | 310.39 | 560.92 | 1481.1 |
| Group | 1 | 4 | 5 | 2 | 3 | 6 |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 4 | NS | |||||
| 5 | NS | |||||
| 2 | NS | |||||
| 3 | NS | NS | ||||
| 6 | NS | NS | NS |
Table 1. Classification of group by canal shaping
Table 2. Classification of group by sealing method & canal shaping
Table 3. Mean preparation time(second) by canal shaping method
Table 4. Statistical differences between experimental groups by shaping time.
Table 5. Mean dye penetration values for the linear measurement(㎛).
Table 6. Statistical differences between experimental groups by mean dye penetration(Two-way ANOVA).
