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Masoumeh Zakeri,Mohamed Mahmoud Nasef,Ebrahim Abouzari-Lotf,Arezoo Moharami,MAJID M. HERAVI 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
Green approaches to the synthesis of spiro-4H-pyrans are reported based on the one-pot and three-component condensation via a domino Knoevenagel/Michael/cyclization sequence. These approachesinvolve evaluation of the activity of several organocatalysts in water as a reaction media and also undersolvent-free in both microwave irradiation and ball milling conditions. Extensive experiments werecarried out to optimize the reaction parameters including type and amount of catalyst, reactiontemperature and time. Microwave irradiation in presence of 4-dimethylaminopyridine (DMAP) wasobserved as the best procedure with good yields, short reaction time, environmental friendliness, andconvenient operation.
Nushin Arjmand,Alireza Boruziniat,Majid Zakeri,Hamideh Sadat Mohammadipour 대한치과보철학회 2018 The Journal of Advanced Prosthodontics Vol.10 No.3
PURPOSE. The purpose of the current study was to evaluate the effect of incorporating nanoparticles of silver (NAg) and amorphous calcium phosphate (NACP) into a self-etching primer of a resin cement on the microtensile bond strength of dentin, regarding the proven antibacterial feature of NAg and remineralizing effect of NACP. MATERIALS AND METHODS. Flat, mid-coronal dentin from 20 intact extracted human third molars were prepared for cementation using Panavia F2.0 cement. The teeth were randomly divided into the four test groups (n=5) according to the experimental cement primer composition: cement primer without change (control group), primer with 1% (wt) of NACP, primer with 1% (wt) of physical mixture of NACP+Nag, and primer with 1% (wt) of chemical mixture of NACP+Nag. The resin cement was used according to the manufacturer’s instructions. After storage in distilled water at 37℃ for 24 h, the bonded samples were sectioned longitudinally to produce 1.0 × 1.0 mm beams for micro-tensile bond strength testing in a universal testing machine. Failure modes at the dentin-resin interface were observed using a stereomicroscope. The data were analyzed by one-way ANOVA and Tukey’s post-hoc tests and the level of significance was set at 0.05. RESULTS. The lowest mean microtensile bond strength was obtained for the NACP group. Tukey’s test showed that the bond strength of the control group was significantly higher than those of the other experimental groups, except for group 4 (chemical mixture of NACP and NAg; P=.67). CONCLUSION. Novel chemical incorporation of NAg-NACP into the self-etching primer of resin cement does not compromise the dentin bond strength.