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KMID : 0362320080330010066
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Journal of Korean Academy of Operative Dentistry
2008 Volume.33 No. 1 p.66 ~ p.75
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EVALUATION OF THE INFLUENCE OF APICAL SIZES ON THE APICAL SEALING ABILITY OF THE MODIFIED CONTINUOUS WAVE TECHNIQUE
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Ryu Mu-Hyun
Jung Il-Young
Lee Seung-Jong
Shin Su-Jung
Kim Eui-Seong
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Abstract
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This study examined the influence of the apical sizes on the sealing ability of a root canal filling.
Thirty-six single rooted teeth with a single canal were divided into 3 groups (n = 12) and instrumented with either the Profile {(R)} or LightSpeed {(R)} system to achieve three different apical sizes (master apical file [MAF] of 25, 40, or 60). The teeth were filled with gutta perch a using a modified continuous wave technique. The level of microleakage was determined by immersing ten teeth from each group into India ink for 1 week followed by clearing with nitric acid, ethyl-alcohol, and methylsalicylate. The microleakage was measured using vernier calipers. The data was analyzed statistically using Kruskal-Wallis one-way ANOVA and a Student-Newman-Keuls Method. Two teeth from each group were sectioned horizontally at 1, 2, 3 and 4 mm from the apex in order to observe a cross section.
The apical size was significantly (p < .05) influenced the level of microleakage. In the Student-Newman-Deuls Method, MAF sizes of 25 and 40; and MAF sizes of 25 and 60, respectively showed a statistically significant difference. There was no significant difference between 40 and 60. In most cross sections, oval-shaped canals were observed, and the irregularity of the internal surface increased with decreasing apical size. There was also an increase in the area of recess, which is the area where the canal space is not filled with either gutta-percha or sealer.
When the root canals are filled using a modified continuous wave technique, canal filling with more consistent and predictable outcome may be expected as the apical preparation size is increased.
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KEYWORD
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Apical enlargement, apical leakage, apical size, sealing ability
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