J Korean Acad Conserv Dent.  2005 Jan;30(1):31-37. 10.5395/JKACD.2005.30.1.031.

An in-vitro evaluation of sealer placement methods in simulated root canal extensions

• Kim SY
• Lee MJ
• Moon JW
• Lee SJ
• Yu MK

• KMID: 1986994
• DOI: http://doi.org/10.5395/JKACD.2005.30.1.031

Abstract

The aim of this study was to evaluate the effectiveness of sealer placement in simulated root canal extensions. Forty resin blocks were attained from the Endo-training Bloc. In each block, the simulated root canal was made with #20, 08taper GT file. After each block was longitudinally split into two halves, a standardized groove was prepared on one canal wall of two halves to simulate the canal extensions with various irregularities. The two halves of each block were assembled and all simulated root canals were obturated by single cone method with AH26 sealer. Four different methods of sealer placement were used: group A, #20 K-file; group B, ultrasonic file; group C, lentulo spiral; group D, EZ-Fill bi-directional spiral. All obturated blocks were stored in 100% humidity at 37degrees C for 1 week. Using a low speed saw, each block was sectioned horizontally. Images of the sections were taken using a stereomicroscope at x 30 magnification and a digital camera. The amount of the sealer in the groove was evaluated using a scoring system, a higher score indicated better sealing effectiveness. The data was statistically analysed by Fisher's Exact Test. The sealing score was the lowest, specially at the middle area of canal extensions in group A, and that was statistically significant difference from other groups. In conclusion, the ultrasonic file, lentulo spiral and EZ-Fill bi-directional spiral were effective methods of sealer placement in simulated canal extensions. The K file was the least effective method, specially at the middle area of canal extensions.

Keyword

Canal extensions; K-file; Ultrasonic file; Lentulo spiral; EZ-Fill bi-directional spiral

MeSH Terms

Dental Pulp Cavity*
Humidity
Ultrasonics

Figure

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  Figure 1 Split resin block.

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  Figure 2 Simulated canal extension.

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  Figure 3 The sealer placement instruments used.

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  Figure 4 A stereomicroscope image of 4 mm cross section from apex in group A.

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  Figure 5 A stereomicroscope image of 4 mm cross section from apex in group A.

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  Figure 6 A stereomicroscope image of 4 mm cross section from apex in group B.

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  Figure 7 A stereomicroscope image of 4 mm cross section from apex in group C.

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  Figure 8 A stereomicroscope image of 4 mm cross section from apex in group D.

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  Figure 9 The number of specimen having score '3' in each group.

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