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Research Article
- Nanoleakage of apical sealing using a calcium silicate-based sealer according to canal drying methods
- Yoon-Joo Lee, Kyung-Mo Cho, Se-Hee Park, Yoon Lee, Jin-Woo Kim
- Restor Dent Endod 2024;49(2):e20. Published online April 19, 2024
- DOI: https://doi.org/10.5395/rde.2024.49.e20
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Abstract
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ePub Objectives This study investigated the nanoleakage of root canal obturations using calcium silicate-based sealer according to different drying methods.
Materials and Methods Fifty-two extracted mandibular premolars with a single root canal and straight root were selected for this study. After canal preparation with a nickel-titanium rotary file system, the specimens were randomly divided into 4 groups according to canal drying methods (1: complete drying, 2: blot drying/distilled water, 3: blot drying/NaOCl, 4: aspiration only). The root canals were obturated using a single-cone filling technique with a calcium silicate–based sealer. Nanoleakage was evaluated using a nanoflow device after 24 hours, 1 week, and 1 month. Data were collected twice per second at the nanoscale and measured in nanoliters per second. Data were statistically analyzed using the Kruskal-Wallis and Mann–Whitney
U -tests (p < 0.05).Results The mean flow rate measured after 24 hours showed the highest value among the time periods in all groups. However, the difference in the flow rate between 1 week and 1 month was not significant. The mean flow rate of the complete drying group was the highest at all time points. After 1 month, the mean flow rate in the blot drying group and the aspiration group was not significantly different.
Conclusions Within the limitations of this study, the canal drying method had a significant effect on leakage and sealing ability in root canal obturations using a calcium silicate-based sealer. Thus, a proper drying procedure is critical in endodontic treatment.
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Basic Research
- Effect of surface treatments of fiber posts on bond strength to composite resin cores
- Hye-Jo Keum, Hyun-Mi Yoo
- J Korean Acad Conserv Dent 2010;35(3):173-179. Published online May 31, 2010
- DOI: https://doi.org/10.5395/JKACD.2010.35.3.173
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Abstract
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The purpose of the present study was to compare the influence of post-surface treatment with silane, hydrogen peroxide, hydrofluoric acid or sandblasting and to investigate the effect of silane in combination of the other treatments on the microtensile bond strength between fiber posts and composite resins for core build-up. Thirty-two glass-fiber posts (FRC Postec Plus, Ivoclar Vivadent, Schaan, Liechtenstein) were divided into eight groups according to the different surface pretreatments performed: silane application (S); immersion in 28% hydrogen peroxide (HP); immersion in hydrogen peroxide followed by application of silane (HP-S); immersion in 4% hydrofluoric acid gel (HF); immersion in hydrofluoric acid gel followed by application of silane (HF-S); sandblasting with aluminum oxide particles (SB); sandblasting followed by application of silane (SB-S). In control group, no surface treatment was performed. The composite resin (Tetric Flow, Ivoclar Vivadent, Schaan, Liechtenstein) was applied onto the posts to produce the composite cylinder specimen. It was sectioned into sticks to measure the microtensile bond strength. The data was analyzed with one-way ANOVA and LSD test for post hoc comparison (p < 0.05). Post pretreatment with sandblasting enhanced the interfacial strength between the fiber posts and core materials. Moreover, sand-blasting followed by application of silane appears to be the most effective method that can improve the clinical performance of glass fiber posts.
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Original Article
- INFLUENCE OF APPICATION TIME OF SELF-ETCHING PRIMERS ON DENTINAL MICROTENSILE BOND STRENGTH
- Young-Gon Cho, Young-Gon Lee, Jong-Uk Kim, Byung-Cheul Park, Jong-Jin Kim, Hee-Young Choi, Cheul-Hee Jin, Sang-Hoon Yoo
- J Korean Acad Conserv Dent 2004;29(5):430-438. Published online January 14, 2004
- DOI: https://doi.org/10.5395/JKACD.2004.29.5.430
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Abstract
PDFPubReaderePub
ABSTRACT This study evaluated the influence of application time of self-etching primers on microtensile bond strength (μTBS) to dentin using three self-etching primer adhesive systems.
Dentin surfaces were exposed from forty-eight human molars. They were conditioned with three self-etching primers (Clearfil SE Bond [SE], Unifil Bond [UF], Tyrian SPE + One Step Plus [TY]) and different primining times (10s, 20s, 30s and 40s). Composite resins were bonded to dentin surfaces and specimens were made. μTBS was tested and statistically compared using by one-way ANOVA and Tukey’s Test.
The results of this study presented that priming time for 10s in SE and UF groups and for 30s and 40s in TY group was highly decreased μTBS to dentin.
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