Hosein Bagheri

Mashhad University of Medical Sciences

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Mina Zarei

Mashhad University of Medical Sciences

Ali Shahabi

Azamsadat Madani

Mashhad University of Medical Sciences

Maryam Forghani

Mashhad University of Medical Sciences

Maryam Javidi

Mashhad University of Medical Sciences

Fatemeh Khorakian

Mashhad University of Medical Sciences

Siavash Moushekhian

Mashhad University of Medical Sciences

Ehsan Sabouri

Mashhad University of Medical Sciences

Ali Qeidari

Mashhad University of Medical Sciences

Maryam Gharechahi

Mashhad University of Medical Sciences

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Mashhad University of Medical Sciences

Mazandaran University of Medical Sciences

Tehran University of Medical Sciences

Institute for Advanced Studies in Basic Sciences

Shiraz University of Medical Sciences

University of Miami

Islamic Azad University, Jahrom Branch

Jackson Memorial Hospital

Instituto de Estudos Avançados da Universidade de São Paulo

Institute for Research in Fundamental Sciences

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The Effect of Sandblasting and Coating of Zirconia by Nano Composites on Bond Strength of Zirconia to Resin Cements.

DOAJ (DOAJ: Directory of Open Access Journals) (2020)

Parisa Karami Zarandi Azamsadat Madani Hosein Bagheri Maryam Moslemion

Despite yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) high strength in dental restoration application, Zr- the framework has a low tendency to react chemically with cement which is the main reason of these restoration failures.The aim of this in vitro study was to evaluate the effect of Y-TZP coating by nanocomposite of silica and aluminosilicate according to the sol-gel dip-coating technique on the bond strength of resin cement to Y-TZP.In this experimental study, Y-TZP blocks (10×10×3mm3) were prepared and sintered and assigned into 4 groups (n=10) for coating including control group without any further surface treatment, sandblasted using 110μm alumina particles under 2.5 bar and tip distance of 10 mm, silica sol dip coating+calcination, aluminosilicate sol dip coating+ calcinations. To confirm chemical bonds of sol-gel covers, Fourier transforms infrared spectroscopy (FT-IR) technique was used. The surface of the sample was investigated by scanning electron microscopy (SEM), energy-dispersive spectroscopy detector (EDS) and x-ray diffraction (XRD) methods. Micro-shear bond strengths (µSBS) of zirconia-cement specimens were evaluated. Data were analyzed with a one-way ANOVA test in SPSS version 11.5 software with a confidence interval of 95%.µSBS of sandblasting, nano-silica, and nano-aluminosilicate specimens were significantly higher than control. µSBS of nano-silica was higher than other groups but no significant difference was observed in µSBS of sandblasting nano-silica, and nano-aluminosilicate groups (p> 0.05).Covering the zirconia surface with non-invasive nano-silica and nano-aluminosilicate using the sol-gel technique leads to improved cement bond strength.

10.30476/dentjods.2019.77789.0

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LABORATORY EVALUATION OF FRACTURE AND DEFORMATION IN PRO TAPER UNIVERSAL AND NEONITI ROTARY FILES

Siavash Moushekhian Hosein Bagheri Ali Shahabi Maryam Forghani

Introduction: The aim of this study was to investigate the fraction rate of ProTaper Universal and Neoniti rotary files during the preparation of simulated severely-curved root canals. Materials & Methods: A total of 70 resin blocks with simulated severely-curved canals were randomly divided into two groups and prepared with ProTaper Universal and Neoniti files. Each set of files was used for cleaning and shaping five canals; the files were sterilized after each application. Afterwards, the number of deformed and fractured files was recorded. Results: Deformation was reported in 11.4 and 19 of ProTaper and Neoniti files, respectively (P>0.05). Also, fraction was found in 11.4 of ProTaper files, while no fracture was reported in the Neoniti group; overall, no statistically significant difference was found between the groups (P>0.05). Conclusion: Based on the present findings, there was no significant difference between ProTaper Universal and Neoniti files with respect to the incidence of deformation or fracture during the preparation of severely-curved canals.

Universal testing machine

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Comparison of Dimensional Changes of NanoZnO with Pulp Dent and AH26

DOAJ (DOAJ: Directory of Open Access Journals) (2019)

Maryam Javidi Mina Zarei Laleh Akhoundzade Hosein Bagheri Maryam Gharechahi

مقدمه:در درمان ریشه، سیل کردن سیستم کانال ریشه پس از مرحله پاکسازی و شکل دهی، ضروری و واجب است. با توجه به معیارهای Grossman ثبات ابعادی از جمله ملزومات یک سیلر است. هدف این مطالعه، مقایسه سیلر نانو زینک اکساید اوژنول با پالپ دنت و AH26 از نظر ثبات ابعادی بود. مواد و روش ها:در این مطالعه برای بررسی تغییرات حجم سیلر ضمن ستینگ، سه گروه ده تایی از سیلر های AH26، پالپ دنت،NanoZOE درون پیپت مدرج با دقت 001/0 که به شکلU خم شده بود، قرار گرفت. حجم معینی از سیلر درون مجموعه حاوی آب و متیلن بلو، درون انکوباتور با دمای 37 درجه قرار گرفت و سپس نمونه ها در ساعت اول و دوم پس از اختلاط، هر 15 دقیقه و در ساعت سوم هر 20 دقیقه و پس از 24 ساعت، یک هفته و 30روز خوانده شد. یافته ها:به طور کلی سیلر AH26 دارای کمترین تغییرات در طول زمان بوده است. سیلر پالپ دنت، تا زمان 90 دقیقه تغییرات ابعادی کمی داشته، اما از زمان 90 دقیقه تا یک هفته بیشترین تغییرات ابعادی را داشته است. سیلر نانو تا زمان 90 دقیقه بیشترین تغییرات را داشت و سپس تا زمان یک هفته، دارای تغییرات ابعادی بیشتر از سیلر AH26 و کمتر از سیلر پالپ دنت بوده است. پس از زمان یک ماه، تغییرات ابعادی بین سه سیلر معنی دار نبوده است. نتیجه گیری:درپایان زمان یک ماه، تغییرات ابعادی نمونه ها در گروه AH26 کمترین و در گروه پالپ دنت بیشترین مقدار را داشت، اما در کل بین سه سیلر تفاوت معنی داری وجود نداشت.

Grossman

10.22038/jmds.2019.14306

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Cytotoxicity and induced apoptosis of a new bioceramic cement containing simvastatin on stem cells from human exfoliated deciduous teeth

Dental Research Journal (2022)

Ali Qeidari Iman Parisay Ehsan Sabouri Fatemeh Khorakian Hosein Bagheri

This study aims to compare cytotoxicity and induced apoptosis of a new bioceramic cement containing different concentrations of simvastatin on stem cells from human exfoliated deciduous teeth (SHED).This research was an in vitro study. To evaluate the cytotoxicity and induced apoptosis of the bioceramic cement containing different concentrations of simvastatin, the SHED were exposed to the cement during 1, 3, and 7 days. Pure bioceramic cement and pure simvastatin with concentrations of 1, 0.1, and 0.01 μM were also tested to evaluate the possible synergic effect. Mineral trioxide aggregate (MTA) as the gold standard of pulp dressing materials was compared. MTT assay and Annexin V assay were used to evaluate cytotoxicity and induced apoptosis, respectively. The data were analyzed using ANOVA and Tukey post hoc tests at the significance level of 0.05.During 7 days, MTA, bioceramic cement, simvastatin 0.1 and 0.01 μM, and bioceramic cement containing 0.1 and 0.01 μM simvastatin increased (P < 0.05) and simvastatin with concentration of 1 μM decreased the cell viability (P < 0.05). Except for MTA and bioceramic cement containing 0.1 and 0.01 μM simvastatin, all other compounds induced apoptosis within 7 days (P < 0.05).After 7 days, the viability of the SHED in the presence of a new bioceramic cement containing 0.1 and 0.01 μM simvastatin was not compromised. Moreover, this cement showed superior results than MTA and provided an environment for cell proliferation. This finding appears to be due to the pharmacological effects of low concentrations of simvastatin.

Bioceramic

MTT assay

Viability assay

10.4103/1735-3327.356816

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