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Showing 3 results for Ranjbar Omidi
Marjan Bolbolian, Mostafa Ghandi, Farnaz Ghorbani, Baharan Ranjbar Omidi, Monirsadat Mirzadeh, Volume 24, Issue 6 (Scientific Journal of Kurdistan University of Medical Sciences 2020)
Abstract
Background and Aim: Common causes of dental discoloration include trauma, drugs, genetic defects, decay, and age. In order to correct discoloration of pulpless teeth, internal bleaching is recommended. The aim of this study was to compare microleakage of resin modified glass ionomer and OrthoMTA used as an intraorifice barrier in non-vital bleaching.
Materials and Methods: In this experimental study, 36 extracted mandibular premolars were selected and randomly divided into two experimental (n = 16) and two control groups (n = 2). 2mm of OrthoMTA and RMGI cements were placed as intraorifice barriers in the experimental groups. Subsequently, we placed a mixture of sodium perborate and 30% hydrogen peroxide as internal bleaching material into the canal and replaced it every three days. Leakage was measured using pH diffusion method by a digital PH meter. Data were statistically analyzed by using T- independent test and repeated measures and variance analysis (P<0.05).
Results: The pH value of the negative control group was as same as the PH of normal saline while the PH value of positive control group was significantly higher than those of other groups. PH values of Ortho MTA and RMGI at the baseline and on the first, sixth and ninth day did not show significant differences with one another, while microleakage of OrthoMTA group was significantly lower on the third day.
Conclusion: In general, OrthoMTA had less leakage than RMGI but both materials can be used as suitable barriers for internal tooth bleaching.
Fatemeh Raoufinejad, Baharan Ranjbar Omidi, Siavash Kamali, Fahimeh Nouri, Faranak Solgi, Volume 25, Issue 2 (Scientific Journal of Kurdistan University of Medical Sciences 2020)
Abstract
Background and Aim: Glass Ionomer cements have been used widely due to their biocompatibility, fluoride release and the ability to decrease the incidence of marginal caries. Minimum film thickness, adequate net setting time & high compressive strength are the main characteristics of a luting cement in clinical dentistry. The purpose of this study is to compare the film thickness & net setting time of Fuji I and a newly developed GIC.
Materials and Methods: 20 samples were prepared with P/L of 1.8:1 for Fuji I & 0.72:0.4 for Iranian cement. For the determination of net setting time, 5×8×10mm metal mold was prepared. Ninety seconds after mixing, carefully lower the indenter 0.1±1mm diameter vertically on the surface of the cement. Repeating the indentations at 30 s. Net Setting Time was recorded as the time elapsed between the end of mixing time and the time when the needle failed to make a complete circular indentation. For the determination of film thickness, two flat glass plates was used and the thickness of both were measured with micrometer device. Then applied a 0.1ml of the mixed cement at the center of the lower plate and applied 150N force to the specimen via the top plate. Then measured the difference of the two plates thickness with and without the cement as the film thickness of the cement. The data were entered into SPSS21 software and Kolmogorov Smirnov and independent T-test were used to evaluate the data.
Results: Fuji I had shorter mean value of Net setting time and smaller film thickness than Iranian cement.This difference was statistically significant.
Conclusion: Fuji I seems a better clinical choice for the cementation of indirect restorations than Iranian cement.
Dr Baharan Ranjbar Omidi, Dr Milad Afazeli, Dr Nayereh Asgari, Volume 27, Issue 6 (Scientific Journal of Kurdistan University of Medical Sciences 2023)
Abstract
Background and Aim: In luting cements, the compressive strength characteristics are important. Sufficient radio opacity for luting cements is helpful in detecting recurrent caries, open gingival margins and residual luting materials. The aim of the present study was to conduct a comparative evaluation of compressive strength and radio opacity between Fuji I glass ionomer (GC, Japan) and Iranian glass ionomer luting cements ( produced by Qazvin Ava Tajhiz Co).
Materials and Methods: In this study, 20 samples were prepared for each cement group. The specimens were prepared with a powder to liquid ratio (1.8/1) and after mixing were poured in mold with a height of 6 mm and a diameter of 4 mm. Then; we evaluated the strength of the specimens. In the radio opacity study, the cement mixture was poured into mold with 15 mm in diameter and 1 mm in thickness. Then the specimens were tested using a digital radiography apparatus. Using Digora for Windows software, radiopacity of the samples were evaluted.
Results: There was no significant difference between Fuji I (59.48 MPa) and Iranian cement (58.92 MPa) in regard to compressive strength (P=0.89). Radio opacity of Fuji I (2.4mmAl) was significantly higher than that of Iranian cement (1.85mmAL) (P =0.003).
Conclusion: The results of this study showed that both properties of compressive strength and radio opacity of the cements were within the range of ISO 9917-2: 2010. If other properties of the Iranian cement are suitable, it can be considered as an alternative to Fuji I glass ionomer cement.
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