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Correlation between tug-back and cone fitness in curved root canals prepared with reciprocating files
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- Authors
- Advisor
- 이우철
- Major
- 치의학대학원 치의과학과
- Issue Date
- 2015-02
- Publisher
- 서울대학교 대학원
- Keywords
- cone fitness ; gutta-percha occupying area ; micro-computed tomography ; reciprocating file ; tug-back
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 치의과학과, 2015. 2. 이우철.
- Abstract
- Objectives.
The purpose of this study was to compare the gutta-percha-occupied area (GPOA) of two gutta-percha cones with different size and taper using micro-computed tomographic (micro-CT) imaging and to evaluate the relationship between GPOA and tug-back in curved root canals instrumented with reciprocating files.
Methods.
Twenty curved roots from extracted human maxillary and mandibular molars were divided into two groups. In group R (n = 10), root canals were prepared with Reciproc R25 files (VDW, Munich, Germany) and in group W (n = 10), root canals were prepared using WaveOne Primary files (Dentsply Maillefer, Ballaigues, Switzerland). The presence or absence of tug-back was decided for both of #25/.08 and #30/.06 gutta-percha cones in every root canal. Micro-CT imaging was used to analyze cone fitness by calculating the percentage of GPOA at 1-, 2-, and 3-mm levels from the working length. The correlation between the sum of the GPOA from all three levels and the presence of tug-back was also investigated. The data were analyzed statistically. The level of significance was set at 5%.
Results.
Tug-back was present in 45% and 100% root canals for #25/.08 and #30/.06 cones, respectively, with a significant difference (P < .05). At the 2- and 3-mm levels, #30/.06 cones produced significantly higher GPOA in both group R and W (P < .05). The sum of the GPOA score was significantly higher in the samples with tug-back than in those without tug-back (88.12% ± 12.17% vs. 75.35% ± 13.42%
P < .05)
however, there was no significant difference between the two cone types for this correlation (P > .05).
Conclusion.
Under the conditions of this study, tug-back can be a definitive determinant for indicating higher cone fitness in the curved root canal prepared with reciprocating files regardless of the cone type.
- Language
- English
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