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RISS 인기검색어
- 검색키워드
- 저자 : Amit Porwal (검색결과 3 건)
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Graphene-based nanomaterial system: a boon in the era of smart nanocarriers
Jha Roopali,Singh Amit,Sharma Pramod Kumar,Porwal Omji,Fuloria Neeraj Kumar 한국약제학회 2021 Journal of Pharmaceutical Investigation Vol.51 No.3
Background Owing to its exceptional electronic, mechanical, thermal, as well as optoelectronic characteristics, graphene—a planar sheet with one-atom thickness and made of carbon atoms closely packed in quite a honeycomb crystal lattice—has already earned special consideration. The investigated characteristics or even applications of such a two-dimensional configuration of the structure of carbon have already created novel innovative opportunities in place of all of the future devices as well as nanosystems. Area covered These graphene systems have also been recognized as a potential drug-delivery carrier intended for target specific or even controlled drug delivery, which could be designed by utilizing various internal or external stimuli. Expert opinion This review predominantly focuses on graphene’s synthesis and derivative, design of stimuli-responsive nanosystems, and applications in various fields. It is highlighted that with remarkable progress in graphene-related research, graphene’s overall execution has a long road ahead to go.
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Farhan Khalid Shah,Ashraf Gebreel,Ali hamed Elshokouki,Ahmed Ali Habib,Amit Porwal 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.2
PURPOSE To compare the changes in the occlusal vertical dimension, activity of masseter muscles and biting force after insertion of immediate denture constructed with conventional, tooth-supported and Implant-supported immediate mandibular complete denture. MATERIALS AND METHODS Patients were selected and treatment was carried out with all the three different concepts i.e, immediate denture constructed with conventional (Group A), tooth-supported (Group B) and Implant-supported (Group C) immediate mandibular complete dentures. Parameters of evaluation and comparison were occlusal vertical dimension measured by radiograph (at three different time intervals), Masseter muscle electromyographic (EMG) measurement by EMG analysis (at three different positions of jaws) and bite force measured by force transducer (at two different time intervals). The obtained data were statistically analyzed by using ANOVA-F test at 5% level of significance. If the F test was significant, Least Significant Difference test was performed to test further significant differences between variables. RESULTS Comparison between mean differences in occlusal vertical dimension for tested groups showed that it was only statistically significant at 1 year after immediate dentures insertion. Comparison between mean differences in wavelet packet coefficients of the electromyographic signals of masseter muscles for tested groups was not significant at rest position, but significant at initial contact position and maximum voluntary clench position. Comparison between mean differences in maximum biting force for tested groups was not statistically significant at 5% level of significance. CONCLUSION Immediate complete overdentures whether tooth or implant supported prosthesis is recommended than totally mucosal supported prosthesis.
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Mohammed M. AL-Moaleem,Farhan Khalid Shah,Nausheen Saied Khan,Amit Porwal 대한치과보철학회 2011 The Journal of Advanced Prosthodontics Vol.3 No.4
PURPOSE Porcelain fused to metal (PFM) crowns provide the best treatment option for teeth that have a large or defective restoration. More than 20% of teeth with PFM crowns or bridges require non-surgical root canal treatment (NSRCT). This may be due to the effect of restorative procedures and the possible leakage of bacteria and or their by-products, which leads to the demise of the tooth pulp. Thus, this study was planned to compare the ability of the restorative materials to seal perforated PFM specimens. MATERIALS AND METHODS The study evaluates the ability of amalgam, composite or compomer restorative materials to close perforated PFM specimen's in-vitro. Ninety PFM specimens were constructed using Ni-Cr alloys and feldspathic porcelain, and then they were divided into 3 groups: amalgam (A), composite + Exite adhesive bond (B) and compomer + Syntac adhesive bond (C). All the PFM samples were embedded in an acrylic block to provide complete sealing of the hole from the bottom side. After the aging period, each group was further divided into 3 equal subgroups according to the thermocycling period (one week for 70 cycles, one month for 300 cycles and three months for 900 cycles). Each subgroup was put into containers containing dye (Pelikan INK), one maintained at 5℃ and the other at 55℃, each cycle for 30 sec time. The data obtained was analyzed by SPSS, 2006 using one way ANOVA test and student t-test and significant difference level at (P<.01). RESULTS The depth of dye penetration was measured at the interfaces of PFM and filling materials using Co-ordinate Vernier Microscope. The lowest levels of the dye penetration for the three groups, as well as subgroups were during the first week. The values of dye leakage had significantly increased by time intervals in subgroups A and C. CONCLUSION It was seen that amalgam showed higher leakage than composite while compomer showed the lowest level of leakage.
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