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Showing 3 results for علاقمند
Effect of sodium fluoride in fifth-generation adhesive (Solobond M) on microleakage and dentin type I collagen content
Madeh Zarei, Homayoon Alaghehmand, Ebrahim Zabihi, Soraya Khafri,
Volume 8, Issue 2 (September- 2019)
Abstract
Introduction: The purpose of this study was to evaluate the addition of sodium fluoride to fifth-generation adhesive (Solobond M) on the degree of microleakage and type I collagen content of dentin.
Materials & Methods: The present in vitro study was conducted on 120 orthodontically extracted human premolars devoid of decay and anatomical defects. Two series of 20 premolars were selected to test immunohistochemistry (IHC) and two series of 40 premolars to evaluate microleakage in two time points of 24 hours and 3 months. In both tests and at both time points, the tests were performed on the samples divided  into four groups: 1-control (only Solobond M), 2-bonding group (Solobond M) containing fluoride, 3-bonding group (Solobond M) containing Chlorhexidine (CHX) after acid etching, and 4-bonding group (Solobond M) containing fluoride+CHX after acid etching.
Results: The IHC score at 24 hours and 3 months was significantly higher in the CHX, Fluoride, and Fluoride+CHX groups compared to the control group. The IHC score in the CHX+fluoride group was higher than that in the CHX group (p=0.04). The degree of microleakage at 24 hours and 3 months was significantly lower in the Fluoride+CHX and Fluoride groups compared to the control group. The degree of microleakage in the Fluoride group was lower than in the CHX group. The IHC score and the microleakage degree had no significant difference in 24 hours and 3 months between the Fluoride+CHX, Fluoride and CHX groups.
Conclusion: It seems that the effect of fluoride on non-degradation of collagen is greater than that of the CHX.

Shear bond strength of composite to primary enamel teeth treated with different concentrations and various molecular weights of chitosan
Sepideh Sorourhomayoun, Homayoon Alaghehmand, Soleiman Mahjoub, Soraya Khafri , Maryam Ghasempour,
Volume 10, Issue 1 ( March- 2021)
Abstract
Introduction:Today, chitosan has a wide usage in Dentistry. Due to its penetration into tooth tissues, inhibition of the acid penetration and anti-demineralization capabilities, chitosan may interfere with the etching mechanism in the bonding restorations. The aim of this study was to evaluate the effect of chitosan with different concentrations and molecular weight on the shear bond strength (SBS) of composite to deciduous teeth's enamel.
Materials & Methods:In this in vitro trial, 50 deciduous anterior human maxillary teeth, which extracted because of orthodontic treatment plan, were selected and divide evenly between groups. In the control specimens, Filtek Z250 composite were packed on buccal teeth surfaces after using self-etch primer  single bond universal and light-cured. In four next groups the teeth were immersed into chitosan solution with low and high molecular weights and 5 mg/ml and 2.5 mg/ml concentrations for 60 seconds and restored with composite as control groups. The SBS of composite to the teeth enamel were determined with Universal testing machine. Data was analyzed by SPSS-18 software using one-way ANOVA and p<0.05 was considered significant.  
Results:The SBS to enamel in the control specimens were 20.98 ± 6.31 MPa. The values were 17.92 ± 7.25, 16.02 ± 6.03, 13.26 ± 5.18 and 17.67 ± 8.95 MPa in the pretreatment with low molecular weight chitosan in 2.5 mg/ml , low molecular weight chitosan in 5 mg/ml , high molecular weight chitosan in 2.5 mg/ml and high molecular weight chitosan with 5 mg/ml concentrations respectively. No significant differences were found regarding SBS between groups. (P>0.05)
Conclusion:Despite a slight reduction in SBS of the composite to the enamel of the treated compare to control, use of chitosan in different concentration and molecular weight did not interfere with the SBS of composite to the enamel of deciduous teeth.

Effect of concentration of hydrofluoric acid and etching time on microtensile bond strength of Zirconia-reinforced lithium silicate ceramics
Morteza Rostami, Faraneh Mokhtarpour, Homayoon Alaghehmand,
Volume 11, Issue 2 (September- 2022)
Abstract
Introduction: Etching the internal surface of ceramic restorations with hydrofluoric (HF) acid and silane is a well-accepted technique to enhance the bond strength. The aim of this study was to assess the effect of concentration of hydrofluoric acid and etching time on microtensile bond strength (µTBS) of zirconia-reinforced lithium silicate (ZLS) ceramics in 2021.
Materials & Methods: This in vitro study was conducted on 8 Celtra-Duo ceramic blocks size 14 measuring 12×14×18 mm. Each ceramic block was divided into three equal pieces by a cutting machine to obtain a total of 24 specimens. The specimens were randomly divided into 6 groups for etching with 5% and 10% HF acid for 30, 60, and120 seconds. Silane (Clearfil porcelain activator) and bonding agent (Clearfil SE Bond) were applied to the etched specimens. Panavia F2 resin cement was applied on the surfaces and light-cured. The mTBS of resin cement to porcelain was measured by a universal testing machine. The mode of failure was determined under a stereomicroscope at x40 magnification. Data were analyzed by one- and two-way ANOVA (P<0.05).
Results: The mean mTBS of Celtra-Duo ceramics subjected to etching for 30, 60, and 120 seconds was not significantly different in the use of 5% and 10% HF acid concentrations (P>0.05). Two-way ANOVA showed that the effects of HF acid concentration and etching time, and their interaction effect were not significant on µTBS of CAD/CAM Celtra-Duo ceramics (P>0.05). The mode of failure was dominantly adhesive in both concentrations of 5% and 10% HF acid. No mixed failure occurred in both concentrations. 
Conclusion: Considering the non-significant difference in µTBS of ceramics subjected to different concentrations of HF acid for different times, the application of HF acid with lower concentration for a shorter period is recommended to prevent possible adverse effects on ceramic strength.

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