المؤلفون: Mohammadian, Fatemeh, Soufi, Soroush, Dibaji, Fatemeh, Sarraf, Pegah, Chiniforush, Nasim, Kharrazifard, Mohammad Javad

المصدر: Lasers in Medical Science; Feb2019, Vol. 34 Issue 1, p201-207, 7p

مصطلحات موضوعية: DENTIN, YAG lasers, BOND strengths, MEDICAL lasers, CALCIUM silicates, DENTAL bonding, ALUMINUM compounds, COMBINATION drug therapy, DENTAL cements, LASERS, OXIDES, PHOSPHORUS compounds, RESEARCH funding, SILICATES, TOOTH roots, CALCIUM compounds

مستخلص: This study aimed to compare the effects of diode and Er:YAG laser irradiation of root dentin on push-out bond strength of mineral trioxide aggregate (MTA) and calcium-enriched mixture (CEM) cements. An in vitro experimental study was conducted on 90 dentin discs, cut out of freshly extracted human teeth. The discs were instrumented to obtain 1.3-mm lumen diameter. Then, they were randomly divided into six groups (n = 15). Groups 1 and 4 subjected to diode laser (Wiser, Doctor Smile, Italy) (980 nm, 1 W, continuous mode) for 10 s and filled with MTA and CEM cements. Groups 2 and 5 subjected to Er:YAG laser (Deka, Italy) (2940 nm, 1 W, 10 Hz, 230 μs) for 10 s and filled with MTA and CEM cements. Groups 3 and 6 (control groups) were filled with MTA and CEM cements without laser irradiation. After 7 days, push-out bond strength test was performed using a universal testing machine in order to evaluate the adhesion of the biomaterials to dentin. The samples were evaluated under a light microscope at × 40 magnification to determine the mode of fracture. Data were analyzed using two-way ANOVA. The highest push-out bond strength (8.76 ± 3.62 MPa) was noted in group 1 (diode/MTA), which was significantly higher than the other groups (P < 0.001). The lowest bond strength (2.61 ± 0.81) was noted in group 6 (control/CEM). Diode laser significantly increased the bond strength of both cements (P < 0.05), but Er:YAG laser irradiation only increased the bond strength of CEM and had no significant effect on MTA (P = 0.603). The bond strength of MTA control group was higher than that of CEM control group (P = 0.001). Push-out bond strength of endodontic cements can be affected by dentin conditioning with diode 980 nm and Er:YAG laser. Nine hundred eighty-nanometer diode laser irradiation is recommended to increase the bond strength of endodontic cements particularly the CEM cement to dentin. [ABSTRACT FROM AUTHOR]

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المؤلفون: Biočanin, Vladimir, Antonijević, Đorđe, Poštić, Srđan, Ilić, Dragan, Vuković, Zorica, Milić, Marija, Fan, Yifang, Li, Zhiyu, Brković, Božidar, Đurić, Marija

المصدر: Journal of Endodontics; May2018, Vol. 44 Issue 5, p816-821, 6p

مصطلحات موضوعية: CALCIUM silicates, TOOTH roots, DENTIN, PERIAPICAL diseases, DENTAL materials, THERAPEUTICS

مستخلص: Introduction The outcome of periapical surgery has been directly improved with the introduction of novel material formulations. The aim of the study was to compare the retrograde obturation quality of the following materials: calcium silicate (Biodentine; Septodont, Saint-Maur-des-Fosses, France), mineral trioxide aggregate (MTA+; Cerkamed Company, Stalowa Wola, Poland), and glass ionomer cement (Fuji IX; GC Corporation, Tokyo, Japan). Methods Materials' wettability was calculated concerning the contact angles of the cements measured using a glycerol drop. Cements' porosity was determined using mercury intrusion porosimetry and micro–computed tomographic (μCT) imaging. Extracted upper human incisors were retrofilled, and μCT analysis was applied to calculate the volume of the gap between the retrograde filling material and root canal dentin. Experiments were performed before and after soaking the materials in simulated body fluid (SBF). Results No statistically significant differences were found among the contact angles of the studied materials after being soaked in SBF. The material with the lowest nanoporosity (Fuji IX: 2.99% and 4.17% before and after SBF, respectively) showed the highest values of microporosity (4.2% and 3.1% before and after SBF, respectively). Biodentine had the lowest value of microporosity (1.2% and 0.8% before and after SBF, respectively) and the lowest value of microgap to the root canal wall ([10 ± 30] × 10 −3 mm 3 ). Conclusions Biodentine and MTA possess certain advantages over Fuji IX for hermetic obturation of retrograde root canals. Biodentine shows a tendency toward the lowest marginal gap at the cement-to-dentin interface. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of Endodontics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Camilleri, J., Grech, L., Galea, K., Keir, D., Fenech, M., Formosa, L., Damidot, D., Mallia, B.

المصدر: Clinical Oral Investigations; Jun2014, Vol. 18 Issue 5, p1437-1446, 10p, 2 Color Photographs, 2 Charts

مصطلحات موضوعية: POROSITY, DENTIN, CALCIUM silicates, TOOTH roots, SCANNING electron microscopy, FLUORESCENT probes, ZINC, MICROSTRUCTURE

مستخلص: Objectives: The aim of this study was to evaluate the porosity and assess the root dentine to material interface of four root-end filling materials based on tricalcium silicate cement using two microscopy techniques. Methods: The porosity of Bioaggregate, Biodentine, a prototype radiopacified tricalcium silicate cement (TCS-20-Zr) and intermediate restorative material (IRM) was evaluated after immersion for 28 days in Hank's balanced salt solution (HBSS) using mercury intrusion porosimetry. The root dentine to material interface of the cements when used as root-end filling materials in extracted human teeth was assessed after 28 days of dry storage and immersion in HBSS using a confocal microscope together with fluorescent tracers and also a field emission gun scanning electron microscope. Results: Biodentine and IRM exhibited the lowest level or degree of porosity. The confocal microscopy used in conjunction to fluorescent tracers demonstrated that dry storage resulted in gaps at the root dentine to material interface and also cracks in the material with Biodentine being the most affected. Zinc was shown to be present in root dentine adjacent to the IRM restorations. Conclusions: Dry storage of Biodentine resulted in changes in the material microstructure and cracks at the root dentine to Biodentine interface. Furthermore, the gaps resulting from material shrinkage allowed the passage of the fluorescent microspheres thus indicating that these gaps are significant and can potentially allow the passage of micro-organisms. [ABSTRACT FROM AUTHOR]

: Copyright of Clinical Oral Investigations is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)