A comparison of smear layer removal effects between conventional chemical surface treatment and double-wavelength (Er,Cr:YSGG 2780 nm and diode 940 nm) laser methods on push-out bound strength of Biodentine
| Autor: | Ezatolah Kazeminejad, Mohammad Ali Vakili, Masood Rahati, Norbert Gutknecht |
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| Rok vydání: | 2021 |
| Předmět: |
Universal testing machine
Materials science Bond strength Scanning electron microscope Simulated body fluid Root canal Smear layer Orthodontics chemistry.chemical_compound medicine.anatomical_structure chemistry Sodium hypochlorite Stereo microscope medicine Periodontics Dentistry (miscellaneous) Oral Surgery Composite material |
| Zdroj: | Lasers in Dental Science. 5:107-115 |
| ISSN: | 2367-2587 |
| Popis: | This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine between laser-assisted endodontic preparation and conventional method of preparation in which the smear layer was removed using sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic (EDTA). Sixty single-rooted teeth were used which were decoronated and endodontically prepared. The teeth were then randomly assigned to three groups (20 per group). In the experimental group, the smear layer was removed by Er,Cr:YSGG laser with 1.25 watts radiated power, pulse repetition rate of 50 Hz, 60 µs pulse duration, 80% water, and 30% air distribution, H-mode, and followed by diode laser 940 nm, which was operated at 1 W, as a continuous wave irradiation. In the conventional group, the smear layer was removed using EDTA 17%. In the control group, the smear layer was not removed. Two teeth from each group were randomly selected for scanning electron microscopy examination, and from each of the other samples, three slices with 1.0 ± 0.1 mm of thickness were cut and each hole was filled with Biodentine. Then, the specimens were immersed in the simulated body fluid (SBF) for 27 days. Using a universal testing machine, the bonding force for dislodgment of filling materials during the push-out test was calculated. Then, a stereomicroscope was used to assess the bond failure mode of Biodentine filling material at × 40. The debonding force in the control, conventional, and experimental groups was 5.3 ± 2.7, 5.4 ± 3.1, and 5.4 ± 2.5 MPs, respectively (p = 0.9). Also, laser and chemicals removed the smear layer effectively. The results of this study showed that, despite the smear layer removal, the push-out bond strength between Biodentine and root canal dentinal wall was not influenced by 17% EDTA + 5% NaOCl and Er,Cr:YSGG + diode lasers irradiation. |
| Databáze: | OpenAIRE |
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