1
|
M M, Chhatar S, Gadre S, Paul S, Vaidya SP, Khatri S, Duari P, Kode J, Ingle A, Kolthur-Seetharam U, Patra M. Improving In Vivo Tumor Accumulation and Efficacy of Platinum Antitumor Agents by Electronic Tuning of the Kinetic Lability. Chemistry 2024; 30:e202302720. [PMID: 37888749 DOI: 10.1002/chem.202302720] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 10/27/2023] [Accepted: 10/27/2023] [Indexed: 10/28/2023]
Abstract
The impact of kinetic lability or reactivity on in vitro cytotoxicity, stability in plasma, in vivo tumor and tissue accumulation, and antitumor efficacy of functional platinum(II) (Pt) anticancer agents containing a O˄O β-diketonate leaving ligand remain largely unexplored. To investigate this, we synthesized Pt complexes [(NH3 )2 Pt(L1-H)]NO3 and [(DACH)Pt(L1-H)]NO3 (L1=4,4,4-trifluoro-1-ferrocenylbutane-1,3-dione, DACH=1R,2R-cyclohexane-1,2-diamine) containing an electron deficient [L1-H]- O˄O leaving ligand and [(NH3 )2 Pt(L2-H)]NO3 and [(DACH)Pt(L2-H)]NO3 (L2=1-ferrocenylbutane-1,3-dione) containing an electron-rich [L2-H]- O˄O leaving ligand. While all four complexes have comparable lipophilicity, the presence of the electron-withdrawing CF3 group was found to dramatically enhance the reactivity of these complexes toward nucleophilic biomolecules. In vitro cellular assays revealed that the more reactive complexes have higher cellular uptake and higher anticancer potency as compared to their less reactive analogs. But the scenario is opposite in vivo, where the less reactive complex showed improved tissue and tumor accumulation and better anticancer efficacy in mice bearing ovarian xenograft when compared to its more reactive analog. Finally, in addition to demonstrating the profound but contrasting impact of kinetic lability on in vitro and in vivo antitumor potencies, we also described the impact of kinetic lability on the mechanism of action of this class of promising antitumor agents.
Collapse
Affiliation(s)
- Manikandan M
- Medicinal Chemistry and Cell Biology Laboratory, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| | - Sushanta Chhatar
- Medicinal Chemistry and Cell Biology Laboratory, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| | - Shubhankar Gadre
- Medicinal Chemistry and Cell Biology Laboratory, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| | - Subhadeep Paul
- Medicinal Chemistry and Cell Biology Laboratory, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| | - Shreyas P Vaidya
- Medicinal Chemistry and Cell Biology Laboratory, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| | - Subhash Khatri
- Molecular Physiology Laboratory, Department of Biological Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| | - Prakash Duari
- Medicinal Chemistry and Cell Biology Laboratory, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| | - Jyoti Kode
- Tumor Immunology & Immunotherapy Group (Kode lab), Advanced Centre for Treatment, Research & Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, 410210, India
- Anti-Cancer Drug Screening Facility (ACDSF), ACTREC, Tata Memorial Centre Kharghar, Navi Mumbai, 410210, India
- Homi Bhabha National Institute (HBNI), Training School Complex Anushakti Nagar, Mumbai, 400094, India
| | - Arvind Ingle
- Homi Bhabha National Institute (HBNI), Training School Complex Anushakti Nagar, Mumbai, 400094, India
- Laboratory Animal Facility, ACTREC, Tata Memorial Centre Kharghar, Navi Mumbai, 410210, India
| | - Ullas Kolthur-Seetharam
- Molecular Physiology Laboratory, Department of Biological Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
- Tata Institute of Fundamental Research-Hyderabad (TIFRH), Hyderabad, 500019, India
| | - Malay Patra
- Medicinal Chemistry and Cell Biology Laboratory, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, Maharashtra, 400005, India
| |
Collapse
|
2
|
Panda TR, M M, Vaidya SP, Chhatar S, Sinha S, Mehrotra M, Chakraborty S, Gadre S, Duari P, Ray P, Patra M. The Power of Kinetic Inertness in Improving Platinum Anticancer Therapy by Circumventing Resistance and Ameliorating Nephrotoxicity. Angew Chem Int Ed Engl 2023; 62:e202303958. [PMID: 37314332 DOI: 10.1002/anie.202303958] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 06/05/2023] [Accepted: 06/14/2023] [Indexed: 06/15/2023]
Abstract
Even in the modern era of precision medicine and immunotherapy, chemotherapy with platinum (Pt) drugs remains among the most commonly prescribed medications against a variety of cancers. Unfortunately, the broad applicability of these blockbuster Pt drugs is severely limited by intrinsic and/or acquired resistance, and high systemic toxicity. Considering the strong interconnection between kinetic lability and undesired shortcomings of clinical Pt drugs, we rationally designed kinetically inert organometallic Pt based anticancer agents with a novel mechanism of action. Using a combination of in vitro and in vivo assays, we demonstrated that the development of a remarkably efficacious but kinetically inert Pt anticancer agent is feasible. Along with exerting promising antitumor efficacy in Pt-sensitive as well as Pt-resistant tumors in vivo, our best candidate has the ability to mitigate the nephrotoxicity issue associated with cisplatin. In addition to demonstrating, for the first time, the power of kinetic inertness in improving the therapeutic benefits of Pt based anticancer therapy, we describe the detailed mechanism of action of our best kinetically inert antitumor agent. This study will certainly pave the way for designing the next generation of anticancer drugs for effective treatment of various cancers.
Collapse
Affiliation(s)
- Tushar Ranjan Panda
- Laboratory of Medicinal Chemistry and Cell Biology, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| | - Manikandan M
- Laboratory of Medicinal Chemistry and Cell Biology, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| | - Shreyas P Vaidya
- Laboratory of Medicinal Chemistry and Cell Biology, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| | - Sushanta Chhatar
- Laboratory of Medicinal Chemistry and Cell Biology, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| | - Suman Sinha
- Institute of Pharmaceutical Research, GLA University, 7 km Stone, NH-2, Mathura-Delhi Road, Mathura, Uttar Pradesh, 281406, India
| | - Megha Mehrotra
- Imaging Cell Signaling & Therapeutics Lab, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Sector 22, Kharghar, Navi Mumbai, 410210, Maharashtra, India
- Homi Bhabha National Institute, 2nd floor, BARC Training School Complex Anushaktinagar, Mumbai, 400094, Maharashtra, India
| | - Sourav Chakraborty
- Imaging Cell Signaling & Therapeutics Lab, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Sector 22, Kharghar, Navi Mumbai, 410210, Maharashtra, India
- Homi Bhabha National Institute, 2nd floor, BARC Training School Complex Anushaktinagar, Mumbai, 400094, Maharashtra, India
| | - Shubhankar Gadre
- Laboratory of Medicinal Chemistry and Cell Biology, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| | - Prakash Duari
- Laboratory of Medicinal Chemistry and Cell Biology, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| | - Pritha Ray
- Imaging Cell Signaling & Therapeutics Lab, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Sector 22, Kharghar, Navi Mumbai, 410210, Maharashtra, India
- Homi Bhabha National Institute, 2nd floor, BARC Training School Complex Anushaktinagar, Mumbai, 400094, Maharashtra, India
| | - Malay Patra
- Laboratory of Medicinal Chemistry and Cell Biology, Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| |
Collapse
|
3
|
Shaikh S, Dhavan P, Singh P, Uparkar J, Vaidya SP, Jadhav BL, Ramana MMV. Design, synthesis and biological evaluation of novel antipyrine based α-aminophosphonates as anti-Alzheimer and anti-inflammatory agent. J Biomol Struct Dyn 2023; 41:386-401. [PMID: 34878960 DOI: 10.1080/07391102.2021.2006088] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Herein, a series of novel antipyrine based α-aminophosphonates derivatives were synthesized and characterized. The synthesized derivatives were subjected for in vitro cholinesterase inhibition, enzyme kinetic studies, protein denaturation assay, proteinase inhibitory assay and cell viability assay. For cholinesterase inhibition, the results inferred that the test compounds possess better AChE activity (0.46 to 6.67 µM) than BuChE (2.395 to 12.47 µM). Compound 4j inhibited both AChE and BuChE (IC50 = 0.475 ± 0.12 µM and 2.95 ± 0.16 µM, respectively), implying that it serves as a dual AChE/BuChE inhibitor. Also, kinetic studies revealed that compound 4j exhibits mixed-type inhibition against both AChE and BuChE, with Ki values of 3.003 µM and 5.750 µM, respectively. Further, protein denaturation and proteinase inhibitory assays were used to test in vitro anti-inflammatory potential. It was found that compound 4o exhibited highest activity against protein denaturation (IC50 = 42.64 ± 0.19 µM) and proteinase inhibition (IC50 = 37.57 ± 0.19 µM) when compared to diclofenac. In addition, cell viability assay revealed that active compounds possess no cytotoxicity against N2a cell and RAW 264.7 macrophages. Finally, molecular docking experiments for AChE, BuChE, and COX-2 were conducted to better understand the binding modes of active compounds.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Sarfaraz Shaikh
- Department of Chemistry, University of Mumbai, Santacruz East, Mumbai, India
| | - Pratik Dhavan
- Department of Life sciences, University of Mumbai, Santacruz East, Mumbai, India
| | - Pinky Singh
- Department of Microbiology, Haffkine Institute, Parel, Mumbai, India
| | - Jasmin Uparkar
- Department of Chemistry, University of Mumbai, Santacruz East, Mumbai, India
| | - S P Vaidya
- Department of Microbiology, Haffkine Institute, Parel, Mumbai, India
| | - B L Jadhav
- Department of Life sciences, University of Mumbai, Santacruz East, Mumbai, India
| | - M M V Ramana
- Department of Chemistry, University of Mumbai, Santacruz East, Mumbai, India
| |
Collapse
|
4
|
Abstract
Chemotherapy is the primary treatment modality employed in the clinic for the treatment of cancer. Despite proven clinical success, adverse side effects are one of the drawbacks of this approach. The prodrug strategy has emerged as an alternative approach with the aim of alleviating these drawbacks. Prodrug activation is typically achieved by either endogenous or exogenous triggers. Exogenous triggers like light are appealing as they are independent of inherent patient and/or cancer-type variations. However, tissue penetration depth remains the Achilles' heel of this approach. In this context, usage of X-rays as the external trigger with infinite tissue penetration depth opens up exciting prospects in prodrug activation strategies.
Collapse
Affiliation(s)
- Shreyas P Vaidya
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Laboratory of Medicinal Chemistry and Cell Biology, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| | - Malay Patra
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Laboratory of Medicinal Chemistry and Cell Biology, Homi Bhabha Road, Navy Nagar, 400005, Mumbai, India
| |
Collapse
|
5
|
Shaikh S, Dhavan P, Uparkar J, Singh P, Vaidya SP, Jadhav BL, Ramana MMV. Synthesis, characterization, in vitro cholinesterase and hRBCs hemolysis assay and computational evaluation of novel 2,3,4,5-tetrahydrobenzothiazepine appended α-aminophosphonates. Bioorg Chem 2021; 116:105397. [PMID: 34628223 DOI: 10.1016/j.bioorg.2021.105397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 09/11/2021] [Accepted: 09/28/2021] [Indexed: 12/30/2022]
Abstract
A series of novel 2,3,4,5-tetrahydrobenzothiazepine appended α-aminophosphonate derivatives were synthesized by subjecting 2,3-dihydrobenzothiazepine to Pudovik reaction using diethyl phosphite. Tested derivatives exhibited better AChE inhibition (0.86-12.85 µM) when compared to BuChE (3.13-19.36 µM). Derivative 5f (IC50 = 0.86 ± 0.08 µM), 5g (IC50 = 1.05 ± 0.06 µM) and 5d (IC50 = 1.64 ± 0.06 µM) exhibited higher AChE inhibitory activity as compared to standard drug galantamine (IC50 = 2.15 ± 0.05 µM). Similarly, derivative 5e (IC50 = 3.13 ± 0.11 µM) and 5f (IC50 = 3.64 ± 0.06 µM) demonstrated comparable BuChE inhibitory activity to reference drug galantamine (IC50 = 3.86 ± 0.03 µM). Further, enzyme kinetic studies were carried out for the most active molecule i.e. derivative 5f (for AChE) and derivative 5e (for BuChE) and the results imply that derivatives 5f and 5e show mixed-type inhibition with Ki values of 1.779 µM and 3.851 µM respectively. Enzyme reversibility inhibition studies demonstrated that all the tested derivatives possess reversible inhibitor characteristics. In addition, % hemolysis studies were carried out using human red blood cells (hRBCs) and the results demonstrated that the synthesized derivatives were biocompatible in nature as they impart very less cytotoxicity to hRBCs (CC50 > 1000 μg/mL). Also, cell viability studies for tested derivatives revealed no cytotoxicity in N2a cells. Moreover, molecular docking studies revealed that derivative 5e and 5f bind to the PAS and CAS of the AChE. ADME predictions suggested that synthesized derivatives have high possibility of being drug-like.
Collapse
Affiliation(s)
- Sarfaraz Shaikh
- Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - Pratik Dhavan
- Department of Life Sciences, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - Jasmin Uparkar
- Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - Pinky Singh
- Department of Microbiology, Haffkine Institute, Parel, Mumbai 400 012, India
| | - S P Vaidya
- Department of Microbiology, Haffkine Institute, Parel, Mumbai 400 012, India
| | - B L Jadhav
- Department of Life Sciences, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - M M V Ramana
- Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai 400 098, India.
| |
Collapse
|
6
|
Shaikh S, Pavale G, Dhavan P, Singh P, Uparkar J, Vaidya SP, Jadhav BL, Ramana MMV. Design, synthesis and evaluation of dihydropyranoindole derivatives as potential cholinesterase inhibitors against Alzheimer's disease. Bioorg Chem 2021; 110:104770. [PMID: 33667902 DOI: 10.1016/j.bioorg.2021.104770] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/29/2021] [Accepted: 02/21/2021] [Indexed: 02/08/2023]
Abstract
A series of novel dihydropyranoindole derivatives containing sulphonamide group were designed, synthesized and evaluated for in-vitro anti-cholinesterase activity. The result showed that all the compounds exhibited potent acetylcholinesterase (AChE) activity (IC50 = 0.41-8.79 µM) while demonstrated moderate to good activity for butyrylcholinesterase (BuChE) (IC50 = 1.17-30.17 µM). The tested compounds exhibited selectivity towards AChE over BuChE. Compound 5o was most potent towards both AChE (IC50 = 0.41 µM) and BuChE (IC50 = 1.17 µM) when compared to standard galantamine and rivastigmine. Enzyme kinetics and molecular docking studies revealed that compound 5o shows mixed type inhibition and binds to peripheral anionic site (PAS) and the catalytic sites (CAS) of both the enzymes. Furthermore, cell viability studies were also performed against N2a cells along with neuroprotection studies against H2O2 in the same cell line. Antioxidant studies using DPPH radical and H2O2 were also performed which revealed that all compounds possessed some antioxidant activity. Also, DNA damage protection assay for compound 5o was performed implying that compound 5o was protective in nature. ADME studies were also performed which demonstrated good pharmacokinetics. These findings indicated that dihydropyranoindole derivatives could be possible drug lead in the search for new multifunctional AD drugs.
Collapse
Affiliation(s)
- Sarfaraz Shaikh
- Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - Ganesh Pavale
- Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - Pratik Dhavan
- Department of Life Sciences, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - Pinky Singh
- Department of Microbiology, Haffkine Institute, Parel, Mumbai 400012, India
| | - Jasmin Uparkar
- Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - S P Vaidya
- Department of Microbiology, Haffkine Institute, Parel, Mumbai 400012, India
| | - B L Jadhav
- Department of Life Sciences, University of Mumbai, Santacruz (E), Mumbai 400 098, India
| | - M M V Ramana
- Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai 400 098, India.
| |
Collapse
|
7
|
Shaikh S, Dhavan P, Singh P, Uparkar J, Vaidya SP, Jadhav BL, Ramana MV. Synthesis of carbazole based α-aminophosphonate derivatives: design, molecular docking and in vitro cholinesterase activity. J Biomol Struct Dyn 2020; 40:4801-4814. [PMID: 33345710 DOI: 10.1080/07391102.2020.1861981] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A series of novel carbazole based α-aminophosphonate derivatives were synthesized under solvent-free condition, characterized and evaluated for their cholinesterase inhibition, enzyme kinetic inhibition, in-vitro cell viability using N2a cells, neuroprotective studies against H2O2-induced stress using N2a cells and antioxidant studies using DPPH radical activity. Test compounds displayed better AChE activity (0.475 to 7.781 µM) than BuChE (3.306 to 21.32 µM). Compound 4j was most potent derivative against AChE as well as BuChE with IC50=0.475 ± 0.12 µM and IC50=3.306 ± 0.21 µM respectively. Kinetic inhibition studies indicate that compound 4j exhibits mixed type inhibition against both enzymes which was supported by molecular docking studies. Cell viability studies showed that compounds did not induce any cytotoxic effect against N2a cells using MTT assay. Also, compound 4j, 4 s and 4r were subjected to H2O2-induced stress using N2a cells and were found to be protective in nature. ADME predictions were carried out to understand the pharmacokinetics behaviour.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Sarfaraz Shaikh
- Department of Chemistry, University of Mumbai, Mumbai, India
| | - Pratik Dhavan
- Department of Life sciences, University of Mumbai, Mumbai, India
| | - Pinky Singh
- Biology Department, Haffkine Institute, Parel, Mumbai, India
| | - Jasmin Uparkar
- Department of Chemistry, University of Mumbai, Mumbai, India
| | - S P Vaidya
- Biology Department, Haffkine Institute, Parel, Mumbai, India
| | - B L Jadhav
- Department of Life sciences, University of Mumbai, Mumbai, India
| | - M V Ramana
- Department of Chemistry, University of Mumbai, Mumbai, India
| |
Collapse
|
8
|
P. Vaidya S, Shridhar G, Ladage S, Ravishankar L. A Facile Synthesis of Isoxazolone Derivatives Catalyzed by Cerium Chloride Heptahydrate in Ethyl Lactate as a Solvent: A Green Methodology. CGC 2016. [DOI: 10.2174/2213346103666160526130509] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
9
|
Mete JJ, Dange SP, Khalikar AN, Vaidya SP. Forced eruption without orthodontic brackets using fiber reinforced composite prostheses: a case report. Eur J Prosthodont Restor Dent 2012; 20:98-101. [PMID: 23101175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Maintenance of periodontal health is one of the most important factors governing success of the restoration and longevity of teeth. For proper maintenance of periodontal health, the biologic width functions as a protective barrier against the entrance of microorganisms in to the internal medium of the periodontal ligament and osseous connective tissue. This clinical case describes a technique to reestablish the biologic width surrounding a fractured central incisor by forced eruption without orthodontic brackets, using fibre reinforced composite prostheses. Main advantages of using fibre reinforced composite prostheses are aesthetic maintenance during the treatment period, no need for occlusal adjustments, simplicity, low cost, and stability.
Collapse
Affiliation(s)
- J J Mete
- Department of Prosthodontics, Government Dental College, Aurangabad, Maharashtra, India.
| | | | | | | |
Collapse
|
10
|
Abstract
The prosthetic episodes, i.e. actual processes of provision, identifying number of prostheses, their maintenance, repairs and replacements were analysed for 104 trans-tibial amputees aged 16 and over, over a 10 year period. The purpose of this investigation was to identify how frequently a new prosthesis is actually required for this group of amputees and what are their maintenance requirements. Variations of requirement between the amputee groups of aged 16-60 and over 60 years are also addressed. In the 10 years period of the study the amputees needed an average of 5.04 new prostheses, 6.25 refits, 2.28 major repairs and 17.04 day repairs. The younger amputees, i.e. below the age of 60 years, required significantly more new prostheses (p=0.003), more refit of sockets (p=0.0012) and more day repairs (p=0.01). Traumatic amputees below the age of 60 years needed significantly more day repairs compared to the non-traumatic amputees in the older age group (p=0.003).
Collapse
Affiliation(s)
- D Datta
- Mobility and Specialised Rehabilitation Centre, Northern General Hospital, Sheffield, England, United Kingdom
| | | | | |
Collapse
|
11
|
Mehta RV, Vaidya SP, Patel JM, Vora PM. Magnetically induced spatial filtering effect with magnetic fluids. Appl Opt 1987; 26:2297-2298. [PMID: 20489864 DOI: 10.1364/ao.26.002297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
|