1
|
Kim K, Lee S, Choi Y, Kim D. Emissions of Fungal Volatile Organic Compounds in Residential Environments and Temporal Emission Patterns: Implications for Sampling Methods. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:12601. [PMID: 36231902 PMCID: PMC9564960 DOI: 10.3390/ijerph191912601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/21/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Currently, little is known about the occurrences of fungi-derived microbial volatile organic compounds (mVOCs) in various indoor materials and their detection in residential environments, despite mVOCs being linked to several acute health effects. We identified various mVOCs emitted from fungi grown on PVC wallpaper, silicone rubber, and malt extract agar. We also investigated mVOCs temporal emission and whether fungi-derived VOCs concentration can be used to estimate fungal concentration in the air using active and passive air sampling methods. Among the three fungal growth media included in this study, silicone rubber produced the most variety of mVOCs: 106 compounds (from Aspergillus niger), 35 compounds (from Alternaria alternata), and 85 compounds (from Penicillium chrysogenum). We also found the emission patterns of eight chemical classes (i.e., aromatics, ethers, aliphatics, alcohols, ketones, aldehydes, chlorides, and nitrides) from the three different fungi. From the results of our field experiments in 11 residential environments, passive air samplers led to higher correlations coefficients (0.08 to 0.86) between mVOCs' air concentrations and airborne fungal concentrations, compared with active air samplers, which showed negative correlation coefficients (-0.99 to -0.02) for most compounds. This study elucidated the occurrence and temporal emission patterns of fungal VOCs in residential environments.
Collapse
|
2
|
Chong WX, Lai YX, Choudhury M, Amalraj FD. Efficacy of incorporating silver nanoparticles into maxillofacial silicone against Staphylococcus aureus, Candida albicans, and polymicrobial biofilms. J Prosthet Dent 2021; 128:1114-1120. [PMID: 33685653 DOI: 10.1016/j.prosdent.2021.01.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 10/22/2022]
Abstract
STATEMENT OF PROBLEM The presence of biofilms on maxillofacial silicone increases the risk of infections and reduces durability. Whether silver nanoparticles (AgNPs) with potent antimicrobial effects help reduce biofilm formation is unclear. PURPOSE The purpose of this in vitro study was to assess the antimicrobial effect of sub 10-nm AgNPs in maxillofacial silicone against Staphylococcus aureus, Candida albicans, and mixed species biofilms containing both and to test the effectiveness of different AgNP concentrations against all 3 biofilms in vitro. MATERIAL AND METHODS Silicone disks (M511; Technovent Ltd) containing 0.0% (control), 0.1%, and 0.5% AgNPs were fabricated and treated with S. aureus, C. albicans, and mixed species strains of both in 24-well culture plates containing appropriate media. Each well received a 0.1-mL aliquot of the standardized suspension of microorganisms. The plates were incubated for 21 consecutive days, and colony-forming units per milliliter (CFU/mL) were measured on the first, third, fifth, seventh, fifteenth, and twenty-first day with the Miles and Misra method. Data were analyzed by 2-way ANOVA and the paired t test to evaluate the relationship between AgNP concentration, microbial strain, and time (α=.05). Mean CFU/mL differences for each time and for each biofilm category were assessed by repeated measure ANOVA. RESULTS AgNPs decreased the mean CFU/mL in both concentrations compared with the control. The 0.1% concentration showed sustained efficacy throughout the test, while the 0.5% concentration had high efficacy initially with a gradual decrease. However, the results were inconsistent for the mixed biofilm. The paired sample t test at day 3 and 15 and day 3 and 21 showed statistically significantly different results (P<.001) in all but 1 group in the 0.5% concentration. The 2-way mixed ANOVA showed statistically significant (P<.001) interaction between AgNP concentration and time in all groups. The 1-way ANOVA of AgNP concentrations was statistically significantly different (P<.001) for all time points. A statistically significant (P<.001) effect of time on CFU/mL was found for all the AgNP concentration groups in all 3 biofilms. CONCLUSIONS Silicone elastomers with sub 10-nm AgNPs displayed antimicrobial properties in vitro against S. aureus, C. albicans, and mixed species strains. AgNPs (0.1%) were effective against both microbial strains and can provide a baseline for further long-term studies regarding antimicrobial efficacy, silver ion leaching, and cellular internalization. Mixed species biofilm needs further exploration with standardized study parameters.
Collapse
Affiliation(s)
- Wen Xin Chong
- Graduate student, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - Yee Xuan Lai
- Graduate student, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - Minati Choudhury
- Senior Lecturer, Clinical Dentistry, International Medical University, Kuala Lumpur, Malaysia.
| | - Fabian Davamani Amalraj
- Senior Lecturer, Division of Applied Biomedical Science and Biotechnology, School of Health Sciences, International Medical University, Kuala Lumpur, Malaysia
| |
Collapse
|
3
|
Sonnahalli NK, Chowdhary R. Effect of nanoparticles on color stability and mechanical and biological properties of maxillofacial silicone elastomer: A systematic review. J Indian Prosthodont Soc 2020; 20:244-254. [PMID: 33223694 PMCID: PMC7654200 DOI: 10.4103/jips.jips_429_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 02/26/2020] [Accepted: 03/27/2020] [Indexed: 01/24/2023] Open
Abstract
Aim: The aim of this systematic review was to evaluate the effect of addition of various nanoparticles into maxillofacial silicone elastomer on color stability and mechanical and biological properties of the silicone elastomer. Settings and Design: This systematic review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines(PRISMA). Materials and Methods: The electronic database search in MEDLINE/PubMed was based on population (silicone elastomer), intervention (nanoparticles), comparison (unreinforced silicone elastomer with nanoparticle-reinforced silicone elastomer), outcome (color stability and mechanical, physical, and biological properties), i.e., PICO framework. The key words used are (”maxillofacial silicone” OR “silicone elastomer” OR “facial silicone”) AND (”nanoparticles” OR “Nano-oxides”) AND (”colour stability” OR “Hardness,” “tensile strength” OR “tear strength” OR “antifungal activity”). Results: The database search resulted in 2099 studies, of which 2066 articles were excluded as they were irrelevant, duplicates, and data were not available. The remaining 33 full-text articles were assessed for eligibility, out of which 2 articles were in Chinese language, 3 articles were thesis documents, and 8 were review articles. A total of 12 articles were excluded and the remaining 20 articles were included. One article was yielded by hand search of references of included studies. A total of 21 studies were included in the present systematic review. Conclusion: With the available evidence in the literature, it can be concluded that addition of nanoparticles at various concentrations may improve the physical and mechanical properties and color stability of the prosthesis made from the silicone elastomers.
Collapse
Affiliation(s)
| | - Ramesh Chowdhary
- Department of Prosthodontics, Raja Rajeswari Dental College and Hospital, Bengaluru, Karnataka, India
| |
Collapse
|
4
|
Tetteh S, Bibb RJ, Martin SJ. Maxillofacial prostheses challenges in resource constrained regions. Disabil Rehabil 2017; 41:348-356. [PMID: 29065718 DOI: 10.1080/09638288.2017.1390697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
BACKGROUND This study reviewed the current state of maxillofacial rehabilitation in resource-limited nations. METHOD A rigorous literature review was undertaken using several technical and clinical databases using a variety of key words pertinent to maxillofacial prosthetic rehabilitation and resource-limited areas. In addition, interviews were conducted with researchers, clinicians and prosthetists that had direct experience of volunteering or working in resource-limited countries. RESULTS Results from the review and interviews suggest rehabilitating patients in resource-limited countries remains challenging and efforts to improve the situation requires a multifactorial approach. CONCLUSIONS In conclusion, public health awareness programmes to reduce the causation of injuries and bespoke maxillofacial prosthetics training programmes to suit these countries, as opposed to attempting to replicate Western training programmes. It is also possible that usage of locally sourced and cheaper materials and the use of low-cost technologies could greatly improve maxillofacial rehabilitation efforts in these localities. Implications for Rehabilitation More information and support needs to be provided to maxillofacial defect/injuries patients and to their families or guardians in a culturally sensitive manner by governments. The health needs, economic and psychological needs of the patients need to be taken into account during the rehabilitation process by clinicians and healthcare organizations. The possibility of developing training programs to suit these resource limited countries and not necessarily follow conventional fabrication methods must be looked into further by educational entities.
Collapse
Affiliation(s)
- Sophia Tetteh
- a Loughborough Design School , Loughborough University , Loughborough , UK
| | - Richard J Bibb
- a Loughborough Design School , Loughborough University , Loughborough , UK
| | - Simon J Martin
- b Department of Materials , Loughborough University , Loughborough , UK
| |
Collapse
|
5
|
Meran Z, Besinis A, De Peralta T, Handy RD. Antifungal properties and biocompatibility of silver nanoparticle coatings on silicone maxillofacial prostheses
in vitro. J Biomed Mater Res B Appl Biomater 2017. [DOI: 10.1002/jbm.b.33917] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Zhala Meran
- School of Biomedical and Biological SciencesUniversity of Plymouth, Drake CircusPlymouthPL4 8AA UK
| | - Alexandros Besinis
- School of Biomedical and Biological SciencesUniversity of Plymouth, Drake CircusPlymouthPL4 8AA UK
- Plymouth University Peninsula Schools of Medicine and Dentistry, University of Plymouth, John Bull Building, Tamar Science ParkPlymouthPL6 8BU UK
| | - Tracy De Peralta
- Plymouth University Peninsula Schools of Medicine and Dentistry, University of Plymouth, John Bull Building, Tamar Science ParkPlymouthPL6 8BU UK
| | - Richard D. Handy
- School of Biomedical and Biological SciencesUniversity of Plymouth, Drake CircusPlymouthPL4 8AA UK
| |
Collapse
|
6
|
Nilanonth S, Shakya P, Chotprasert N, Srithavaj T. Combination prosthetic design providing a superior retention for mid-facial defect rehabilitation: A Case Report. J Clin Exp Dent 2017; 9:e590-e594. [PMID: 28469829 PMCID: PMC5410684 DOI: 10.4317/jced.53513] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 11/27/2016] [Indexed: 11/05/2022] Open
Abstract
Large maxillofacial defects from malignant tumor treatment are rarely rehabilitated by surgical reconstruction alone. Ameloblastic carcinoma, a rare aggressive odontogenic malignant tumor, requires wide surgical excision to gain a tumor-free margin. In the post-surgical defect, prosthetic rehabilitation is the treatment of choice to restore function and esthetics. Moreover, an intra-oral prosthesis such as an obturator restores speech, mastication and deglutition. Retention of the obturator is a major problem while rehabilitating large defects. The existing anatomical structures from the defect with the help of magnet attachments are suitable to enhance retention, stability and support of the prostheses. This case report presents a patient with an intraoral and extra-oral combination defect following surgical resection of ameloblastic carcinoma and describes the prosthetic techniques and design considerations for a magnet-retained obturator and mid-facial prosthesis. An implant-retained mid-facial prosthesis was fabricated. The retention of combined prostheses was obtained from the remaining right posterior teeth only. The patient had an unfavorable defect due to the large size and presence of scar contracture that vertically tends to dislodge the obturator. Magnet attachments were used to combine the facial and oral prosthesis, minimize the vertical dislodging forces and enhance retention. In addition, the retention was also gained from the scar band at lower border of mid-facial defect that avoided the need for more implants surgery. Magnet attachment with anatomical structure of the mid-facial defect provides an acceptable means of retention in large extraoral-intraoral combinations defects, improving the function, esthetic and the patients' quality of life. Key words:Mid-facial prosthesis, obturator, magnet attachment, maxillectomy.
Collapse
Affiliation(s)
- Supassra Nilanonth
- DDS, Grad Dip, Maxillofacial prosthetic service, Faculty of Dentistry, Mahidol University. Bangkok, Thailand
| | - Prana Shakya
- BDS, MSc, Teaching assistant, Maxillofacial Prosthetic Service, Faculty of Dentistry, Mahidol University. Bangkok Thailand
| | - Natdhanai Chotprasert
- DDS, MSc, PhD, Lecturer, Maxillofacial Prosthetic Service, Faculty of Dentistry, Mahidol University. Bangkok Thailand
| | - Theerathavaj Srithavaj
- DDS, MS, Assistant Professor, Maxillofacial Prosthetic Service, Faculty of Dentistry, Mahidol University. Bangkok Thailand
| |
Collapse
|
7
|
Ghoseiri K, Safari MR. Prevalence of heat and perspiration discomfort inside prostheses: Literature review. ACTA ACUST UNITED AC 2014; 51:855-68. [DOI: 10.1682/jrrd.2013.06.0133] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 03/16/2014] [Indexed: 11/05/2022]
|
8
|
Cabañes FJ, Bragulat MR, Castellá G. Hortaea werneckiiisolated from silicone scuba diving equipment in Spain. Med Mycol 2012; 50:852-7. [DOI: 10.3109/13693786.2012.679628] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
9
|
Leow ME, Pho RW, Chang SH, Roeshadi D, Pereira BP. Rehabilitation of the congenital amputee after fitting with aesthetic hand prostheses. Tech Hand Up Extrem Surg 2006; 5:125-34. [PMID: 16520641 DOI: 10.1097/00130911-200106000-00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- M E Leow
- Department of Orthopaedic Surgery, The National University of Singapore, Singapore Department of Hand and Reconstructive Surgery, National University Hospital, Singapore
| | | | | | | | | |
Collapse
|
10
|
Affiliation(s)
- B P Pereira
- Department of Orthopaedic Surgery, The National University of Singapore, Singapore Department of Hand & Reconstructive Microsurgery, National University Hospital, Singapore
| | | | | |
Collapse
|
11
|
Dorko E, Kmet'ová M, Marossy A, Dorko F, Molokácová M. Non-albicans Candida species isolated from plastic devices. Mycopathologia 1999; 148:117-22. [PMID: 11189762 DOI: 10.1023/a:1007178806720] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In this work we point out an occurrence of non-albicans Candida species isolated from catheters, cannulas and drains. We detected eight non-albicans Candida species in 49 examined samples: C. parapsilosis (n = 26), C. tropicalis (n = 12), C. krusei (n = 4), C. claussenii, C. mesenterica (n = 2 for each), C. guilliermondii, C. kefyr and C. lusitaniae (n = 1 for each). Material examined from children hospitalized in intensive care units was the most frequent. Eight samples were from the oncology department, seven from the surgery department, six from the anaesthesiology department, four from the dialysis unit, two from the hematology department, one from the internal medicine department and one from the stomatology department. We examined cannula scraping 26 times (53%), catheter scraping 14 times (28.6%) and drain scraping nine times (18.4%).
Collapse
Affiliation(s)
- E Dorko
- Department of Physiology, Medical Faculty, Safarik's University, Kosice, Slovakia
| | | | | | | | | |
Collapse
|
12
|
Abstract
In this technical note, an overview of RTV (room-temperature-vulcanising) silicone elastomers is provided. The properties and applications of 3 different types of RTV silicones in producing prostheses for the hand are discussed. Vinyl polysiloxanes are excellent silicone impression materials that offer the advantages of a rapid cure, near exact duplication of fine details and ease of removal of the cured impression without permanent deformation. RTV-2 dimethyl polysiloxanes are ideal for mould-making and fabricating prostheses given their favourable qualities that range from ease of pigmentation, adjustable consistency, manageable curing rate and accuracy in recording fine details in the liquid state to excellent stain-resistance, elasticity and biodurability in the vulcanised state. RTV-1 dimethyl polysiloxanes are self-curing, ready-for-use silicones that adhere adequately well to most substrates and are useful for extrinsic hue modifications and waterproofing of the prosthesis. The basic techniques for each of these applications are also discussed. The cure-inhibition of addition-curing RTV silicones by sulphur-, tin- and nitrogen-containing contaminants and its damaging consequence is highlighted. A compilation of known contaminating agents is provided so that prior contact with these objects can be avoided when working with addition-curing silicones. The precautionary measures to prevent the problem are also outlined.
Collapse
Affiliation(s)
- M E Leow
- Department of Orthopaedic Surgery, The National University of Singapore, Singapore
| | | |
Collapse
|