Journal List > J Korean Acad Conserv Dent > v.27(4) > 1056014

Hwang, Cho, and Kim: A comparison of thermoplasticized injectable gutta-percha techniques in ribbon-shaped canals : adaptation to canal walls

Abstract

The aim of this study is to compare the adaptability of thermoplasticized injectable gutta-percha technique to the canal walls in ribbon-shaped canals.
Thirty resin models simulated ribbon-shape canals were instrumented to #40 using .06 taper Profile systems. Three groups of each 10 resin models were obturated by the lateral condensation technique(LC) and the two thermoplasticized injectable gutta-percha technique; Ultrafil Endoset+Obtura II(EO) and Ultrafil Firmset(UF), respectively.
After resin model were kept at room temperature for 4 days, they were resected horizontally with microtome at 1, 2, 3, 4 and 5mm levels from apex. At each levels, image of resected surface were taken using CCD camera under a stereomicroscope at ×40 magnification and stored. Ratio of the area of gutta-percha was obtained by calculating area of gutta-percha cone to the total area of canal using digitized image-analyzing program. The data were collected then analyzed statistically using One-way ANOVA.
The results were as follows.
1. At 1mm levels, there was no statistically significant difference in the mean ratio of gutta-percha among the groups.
2. At 2mm level, EO showed the highest mean ratio of gutta-percha (p<0.05) and there was no significant difference between LC and UF.
3. At 3, 4, 5mm levels, EO and UF had significantly greater mean ratio of gutta-percha than LC(p<0.05) and there was no significant difference between EO and UF.
In conclusion, the thermoplasticized injectable gutta-percha techniques demonstrated relatively favorable adaptability to canal walls than lateral condensation technique in ribbon-shaped canals except for 1mm level.

Figures and Tables

Fig. 1
Mean ratio of area of gutta-percha in each group.
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Fig. 2
Mean ratio of area of gutta-percha for each level.
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Fig. 3
Representative photograph of Ultrafil Endoset+Obtura II group at the 1mm level showing the incomplete obturation of isthmus.(orginal magnification ×40)
jkacd-27-411-g003
Fig. 4
Representative photograph of Ultrafil Firmset group at the 1mm level showing the incomplete obturation of isthmus.(orginal magnification ×40)
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Fig. 5
Representative photograph of Lateral condensation group at the 1mm level showing the incomplete obturation of isthmus.(orginal magnification ×40)
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Fig. 6
Representative photograph of Ultrafil Endoset+Obtura II group at the 2mm level showing the complete obturation of isthmus.(orginal magnification ×40)
jkacd-27-411-g006
Fig. 7
Representative photograph of Ultrafil Firmset group at the 2mm level showing the complete obturation of isthmus.(orginal magnification ×40)
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Fig. 8
Representative photograph of Lateral condensation group at the 2mm level showing the complete obturation of isthmus.(orginal magnification ×40)
jkacd-27-411-g008
Fig. 9
Representative photograph of Ultrafil Endoset+Obtura II group at the 3mm level showing the good adaptability to the canal wall.(orginal magnification ×40)
jkacd-27-411-g009
Fig. 10
Representative photograph of Ultrafil Firmset group at the 3mm level showing the good adaptability to the canal wall.(orginal magnification ×40)
jkacd-27-411-g010
Fig. 11
Representative photograph of Lateral condensation group at the 3mm level showing the gaps between gutta-perchas.(orginal magnification ×40)
jkacd-27-411-g011
Fig. 12
Representative photograph of Ultrafil Endoset+Obtura II group at the 4mm level showing the good adaptability to the canal wall.(orginal magnification ×40)
jkacd-27-411-g012
Fig. 13
Representative photograph of Ultrafil Firmset group at the 4mm level showing the good adaptability to the canal wall.(orginal magnification ×40)
jkacd-27-411-g013
Fig. 14
Representative photograph of Lateral condensation group at the 4mm level showing the gaps between gutta-perchas and canal wall.(orginal magnification ×40)
jkacd-27-411-g014
Fig. 15
Representative photograph of Ultrafil Endoset+Obtura II group at the 5mm level showing the good adaptability to the canal wall.(orginal magnification ×40)
jkacd-27-411-g015
Fig. 16
Representative photograph of Ultrafil Firmset group at the 5mm level showing the good adaptability to the canal wall.(orginal magnification ×40)
jkacd-27-411-g016
Fig. 17
Representative photograph of Lateral condensation group at the 5mm level showing the gaps between gutta-perchas and canal wall.(orginal magnification ×40)
jkacd-27-411-g017
Table 1
Experimental group
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Table 2
Mean ratio of area of gutta-percha(%) and standard deviation
jkacd-27-411-i002
Table 3
Significance testing of mean ratio of area of gutta-percha at 1mm level in each group
jkacd-27-411-i003

NS : not statistically significant

Table 4
Significance testing of mean ratio of area of gutta-percha at 2mm level in each group
jkacd-27-411-i004

*statistically significant(p<0.05)

Table 5
Significance testing of mean ratio of area of utta-percha at 3, 4, 5mm level in each group
jkacd-27-411-i005

*statistically significant(p<0.05)

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