J Korean Acad Conserv Dent.  2007 Nov;32(6):491-497.

Comparison of apical sealing efficacies using different plugging depth in continuous wave of obturation technique

• Lee SJ
• Park JK
• Hur B
• Kim HC

Abstract

The purpose of this study was to compare apical sealing ability of continuous wave canal filling technique according to various heat source plugging depths. Eighty one extracted human premolars with straight root were cleaned and shaped to size 35 using .06 taper rotary NiTi file. After cleansing and shaping, the teeth were divided into 5 groups following the heat source probing depths from the apex; 3, 4, 5, 6 and 7 mm. All specimens were filled using E&Q plus with #35 / .06 tapered gutta-percha cone. The positive control teeth were not filled. All teeth were coated with nail varnish except the apical 1 mm around the apical foramen. Negative control teeth were completely sealed include the apical foramen. All specimens were immersed in 1% methylene blue solution for 72 hours. Then the specimens were sectioned horizontally at 1, 2 and 3 mm from the root apex. Each sectioned surface was photographed using a digital camera attached to the stereomicroscope at 12.5 x 2.5 fold magnification. All points at 1, 2 and 3 mm were summed as final score of one specimen. Statistical analysis of the collected data was performed. Under the condition of this study, there was no significant difference between the heat source plugging depths of 3, 4, 5, 6 and 7 mm in apical sealing ability. All of apical heat source plugging depth from 3 to 7 mm including Buchanan's protocol -from 5 to 7 mm- seems to be acceptable in clinical application.

Keyword

Continuous wave of obturation technique; dye leakage; heat source; plugging depth

MeSH Terms

Bicuspid
Gutta-Percha
Hot Temperature
Humans
Methylene Blue
Paint
Tooth
Tooth Apex
Gutta-Percha
Methylene Blue

Figure

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  Figure 1 Five-point scoring system at each level; Bold line means the dye leakage area.

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  Figure 2 Representative samples of each degree according to Five-point scoring system. A; 2 mm level of the specimen of 3 mm plugging depth, B; 3 mm level of the specimen of 5 mm plugging depth, C; 1 mm level of the specimen of 6 mm plugging depth, D; 1 mm level of the specimen of 7 mm plugging depth, E; 1 mm level of a specimen of positive control group

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