A comparison of thermoplasticized injectable gutta-percha techniques in ribbon-shaped canals : adaptation to canal walls

Article information

Restor Dent Endod. 2002;27(4):411-420

Publication date (electronic) : 2002 July 31

doi : https://doi.org/10.5395/JKACD.2002.27.4.411

Hyun-sook Hwang , Kyung-mo Cho , Jin-woo Kim

Department of Conservative dentistry, College of Dentistry, Kangnung National University, Korea.

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.

Keywords: Ribbon-shaped canal; Thermoplasticized injectable gutta-percha technique; Adaptability

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Fig. 1

Mean ratio of area of gutta-percha in each group.

Fig. 2

Mean ratio of area of gutta-percha for each level.

Fig. 3

Representative photograph of Ultrafil Endoset+Obtura II group at the 1mm level showing the incomplete obturation of isthmus.(orginal magnification ×40)

Fig. 4

Representative photograph of Ultrafil Firmset group at the 1mm level showing the incomplete obturation of isthmus.(orginal magnification ×40)

Fig. 5

Representative photograph of Lateral condensation group at the 1mm level showing the incomplete obturation of isthmus.(orginal magnification ×40)

Fig. 6

Representative photograph of Ultrafil Endoset+Obtura II group at the 2mm level showing the complete obturation of isthmus.(orginal magnification ×40)

Fig. 7

Representative photograph of Ultrafil Firmset group at the 2mm level showing the complete obturation of isthmus.(orginal magnification ×40)

Fig. 8

Representative photograph of Lateral condensation group at the 2mm level showing the complete obturation of isthmus.(orginal magnification ×40)

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)

Fig. 10

Representative photograph of Ultrafil Firmset group at the 3mm level showing the good adaptability to the canal wall.(orginal magnification ×40)

Fig. 11

Representative photograph of Lateral condensation group at the 3mm level showing the gaps between gutta-perchas.(orginal magnification ×40)

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)

Fig. 13

Representative photograph of Ultrafil Firmset group at the 4mm level showing the good adaptability to the canal wall.(orginal magnification ×40)

Fig. 14

Representative photograph of Lateral condensation group at the 4mm level showing the gaps between gutta-perchas and canal wall.(orginal magnification ×40)

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)

Fig. 16

Representative photograph of Ultrafil Firmset group at the 5mm level showing the good adaptability to the canal wall.(orginal magnification ×40)

Fig. 17

Representative photograph of Lateral condensation group at the 5mm level showing the gaps between gutta-perchas and canal wall.(orginal magnification ×40)

Table 2

Mean ratio of area of gutta-percha(%) and standard deviation

Table 3

Significance testing of mean ratio of area of gutta-percha at 1mm level in each group

NS : not statistically significant

Table 4

Significance testing of mean ratio of area of gutta-percha at 2mm level in each group

^*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