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Santhaveesuk P, Saenthaveesuk P, Holland JN, Kiat-Amnuay S. Microwave disinfection of facial silicone prostheses, Part 1: Color stability. J Prosthet Dent 2024; 131:980.e1-980.e8. [PMID: 38448355 DOI: 10.1016/j.prosdent.2024.02.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 03/08/2024]
Abstract
STATEMENT OF PROBLEM The choice of cleaning method is an important consideration for lengthening the serviceable time of facial prostheses as microbial organisms and biofilms could degrade facial prostheses and cause skin irritation. Whether microwave disinfection is a suitable cleaning method without degradation of the properties of a prosthesis is unclear. PURPOSE The purpose of this in vitro study was to measure the color stability of 6 commonly used facial silicone elastomers after microwave disinfection over a simulated 1.5-year period. MATERIAL AND METHODS Six different facial silicone elastomers: MDX4-4210, MDX4-4210/Type A, M511, A-2186, VST-50, and A-2000 were mixed with intrinsic silicone white opacifier (except for the control group) and subsequently combined with 4 silicone intrinsic pigment color groups: red (R), yellow (Y), burnt sienna (B), and a mixture of R+Y+B (M). The control group was a silicone elastomer without opacifier or pigment. Each of the 30 experimental groups consisted of 5 specimens (N=150). Five specimens were placed in a 250-mL Erlenmeyer flask filled with 160 mL of tap water. Seven flasks were then placed in a 660-W microwave oven. An exposure of 6 minutes was used according to the antimicrobial efficacy of microwave disinfection protocol on facial silicone prostheses with a final water temperature of 60 °C for 18 times (simulating 1.5 years of microwave disinfection with one 6-minute exposure monthly). A spectrophotometer was used to measure reflectance color change values (∆E). Color differences were calculated following CIELab (∆E*ab) and CIEDE2000 (∆E00) formulae. ∆E*ab and ∆E00 were statistically analyzed by a linear mixed effects model with 3 factors (silicone type, color shade, and time) using the R Statistical software program (α=.05). RESULTS Both ∆E*ab and ∆E00 of all silicone elastomers studied were less than the visual perceptibility thresholds (∆E*ab<1.1 and E00<0.7) and were considered clinically acceptable (∆E*ab<3.0 and E00<2.1) after the 1.5-year simulation of microwave disinfection. Yellow and blue pigments had more effect on MDX4-4210 and M511, while red pigment had more effect on MDX4-4210, MDX4-4210/Type A, and M511 (P<.05). Nevertheless, the values were still below the perceptibility threshold (∆E*ab≤1.0 and E00<0.6). CONCLUSIONS All 6 facial silicone elastomers maintained clinically acceptable color after 18 months of exposure to microwave disinfection.
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Affiliation(s)
- Penchanok Santhaveesuk
- Former Prosthodontic Resident, Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand; and Former AEGD Preceptor, University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas
| | - Pensiri Saenthaveesuk
- Lecturer, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand; and Former AEGD Resident, University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas
| | - Julian Nathaniel Holland
- Senior Statistician, Office of Research, University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas
| | - Sudarat Kiat-Amnuay
- Professor and Section Head, Department of General Practice and Dental Public Health, Houston Center for Biomaterials and Biomimetics, University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas.
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Santhaveesuk P, Serichetaphongse P, Kiat-Amnuay S. Microwave disinfection of facial silicone prostheses, part 2: Mechanical properties. J Prosthet Dent 2024; 131:340.e1-340.e6. [PMID: 38212157 DOI: 10.1016/j.prosdent.2023.11.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 11/21/2023] [Accepted: 11/21/2023] [Indexed: 01/13/2024]
Abstract
STATEMENT OF PROBLEM Part 1 of this 2-part study determined that microwave disinfection did not degrade the color stability of facial silicone prostheses. However, investigations on the effects of microwave disinfection on the mechanical properties of different silicone elastomers are lacking. PURPOSE The purpose of this in vitro study was to examine the mechanical properties of commonly used colored facial silicone elastomers before and after microwave disinfection over a simulated 1.5-year period. MATERIAL AND METHODS Six commonly used facial silicone elastomers: MDX4-4210, MDX4-4210/Type A, M511, A-2186, VST-50, and A-2000 were combined with functional intrinsic silicone pigments and opacifier (red, yellow, blue, and white). A total of 288 specimens were fabricated (n=12). Half of the specimens were tested for mechanical properties as the baseline, while the other specimens were tested after microwave disinfection. Microwave disinfection was performed with 660 W, 6 minutes of exposure time, and microwaved for 18 cycles to simulate 1.5 years of usage (one 6-minute exposure monthly). For mechanical property testing, all specimens were tested for tensile strength and percentage elongation (ASTM D412), tear strength (ASTM D624), and hardness (ASTM D2240). For each property, a 2-way ANOVA (silicone type and microwave disinfection factors) and Tukey multiple comparison test were performed using the R statistical software program (α=.05). RESULTS Following microwave disinfection, tensile strength and percentage elongation of A-2000 increased significantly (P<.05). MDX4-4210, MDX4-4210/Type A, and A-2000 showed significant increases in their hardness (P<.001). Tear strength also increased significantly for MDX4-4210 and VST-50 (P<.05). Among the materials tested (ranked from highest to lowest value,=not statistically significant different), for tensile strength, VST-50>A-2186=A-2000>MDX4-4210/Type A=M511=MDX4-4210 (P<.05). For percentage elongation, VST-50>MDX4-4210/Type A>A-2186>M511=A-2000=MDX4-4210=M511 (P<.05). For hardness, A-2000=A-2186>M511=VST-50>MDX4-4210>MDX4-4210/Type A (P<.05). For tear strength, VST-50>A-2186>A-2000>M511>MDX4-4210/Type A=MDX4-4210 (P<.05). CONCLUSIONS Overall, the mechanical properties of all the silicones tested were not adversely affected by microwave disinfection. VST-50 showed the best mechanical properties among the materials tested both before and after microwave disinfection. Microwave energy is a safe method of disinfecting the silicone elastomers tested in this study.
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Affiliation(s)
- Penchanok Santhaveesuk
- Former Prosthodontic Resident, Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand; and Former AEGD Preceptor, University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas
| | - Pravej Serichetaphongse
- Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Sudarat Kiat-Amnuay
- Professor and Section Head, Department of General Practice and Dental Public Health, Houston Center for Biomaterials and Biomimetics, University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas.
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Alkhtani F. Disinfection of polyvinyl siloxane impression material using ozone gas, 0.1% riboflavin, glutaraldehyde, and microwave irradiation and their effect on physical properties. Photodiagnosis Photodyn Ther 2022; 41:103242. [PMID: 36528282 DOI: 10.1016/j.pdpdt.2022.103242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 11/24/2022] [Accepted: 12/13/2022] [Indexed: 12/15/2022]
Abstract
AIM To assess the antimicrobial effect of ozone gas (OG) 0.1% riboflavin (RF), glutaraldehyde (GaH), and microwave irradiation (MI) on Polyvinyl siloxane impression material formerly colonized with E. coli, P. Aeruginosa, E. faecalis, and S.aureus and their effect on the physical properties MATERIAL AND METHODS: One hundred disk-shaped specimens (diameter 10 mm and thickness 3 mm) were developed by using polyvinylsiloxane impression material and inoculated by the American Type Culture Collection (ATCC) of E. coli, P. aeruginosa, E. faecalis, and S.aureus in an in-vitro setup. The samples were arbitrarily isolated into five groups and subjected for 3 min to the designated disinfection modality. Group 1 Control, group 2: GaH, group 3: 0.1% RF, group 4: MI, and group 5 OG. Following decontamination, the physical properties (contact angle, strain-in-compression, and tear strength) of impression materials were evaluated. Statistical analysis for CFU/mL (log10) for exposed E. coli, P. aeruginosa, E. faecalis, and S.aureus was performed by using analysis of variance (ANOVA) and Tukey's multiple comparison tests at a p-value of less than 0.05. RESULTS The most effective antimicrobial efficacy for impression disinfection against all scrutinized microbial colonies were displayed by group 5 OG and the lowest disinfection effectiveness was unveiled by the control group with no treatment. The intragroup comparison revealed that impression disinfection with GaH, MI, and ozone corroborated analogous antimicrobial efficacy(p > 0.05). The disinfecting capacity of the impression material with 0.1% RF was significantly less than MI, GaH, and OG (p < 0.05). CONCLUSION Disinfection of polyvinyl siloxane impression material with ozone gas, microwave irradiation, and glutaraldehyde demonstrated reasonable antimicrobial efficiencies against E. coli, P. aeruginosa, E. faecalis, and S.aureus with no detrimental effects on the physical properties of impression material. More studies are advocated to extrapolate the findings of the present study.
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Affiliation(s)
- Fahad Alkhtani
- Department of Prosthodontics, College of Dentistry, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia.
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Sakima VT, Vega-Chacón Y, Cerri PS, Shokeen B, Lux R, Mima EGDO. A Denture Use Model Associated with Candida spp. in Immunocompetent Male and Female Rats. J Fungi (Basel) 2022; 8:466. [PMID: 35628722 PMCID: PMC9147495 DOI: 10.3390/jof8050466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 04/02/2022] [Accepted: 04/05/2022] [Indexed: 01/27/2023] Open
Abstract
Denture stomatitis (DS) is a common infection in denture wearers, especially women. This study evaluated the induction of DS using acrylic devices attached to the palate of rats combined with inoculation of Candida spp. Immunocompetent male and female rats received a carbohydrate-rich diet. Impressions were taken from the rats’ palate to individually fabricate acrylic devices. Mono- and multispecies biofilms of C. albicans, C. glabrata, and C. tropicalis were grown on the devices, which were then cemented on posterior teeth and kept in the rats’ palate for four weeks. Microbial samples from the palate and the device were quantified. Oral microbiome of rats inoculated with C. albicans was analyzed by 16S rRNA gene sequencing. Log10(CFU/mL) were analyzed by mixed or two-way MANOVA (α = 0.05). Candida spp. and acrylic device did not induce palatal inflammation macroscopically nor microscopically. Although there was an increase (p < 0.001) of the total microbiota and female rats demonstrated higher (p = 0.007) recovery of Candida spp. from the palate, the gender differences were not biologically relevant. The microbiome results indicate an increase in inflammatory microbiota and reduction in health-associated micro-organisms. Although Candida spp. and acrylic device did not induce DS in immunocompetent rats, the shift in microbiota may precede manifestation of inflammation.
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Affiliation(s)
- Vinicius Tatsuyuji Sakima
- Laboratory of Applied Microbiology, Department of Dental Materials and Prosthodontics, School of Dentistry, Araraquara, São Paulo State University (UNESP), São Paulo 14801-903, Brazil; (V.T.S.); (Y.V.-C.)
| | - Yuliana Vega-Chacón
- Laboratory of Applied Microbiology, Department of Dental Materials and Prosthodontics, School of Dentistry, Araraquara, São Paulo State University (UNESP), São Paulo 14801-903, Brazil; (V.T.S.); (Y.V.-C.)
| | - Paulo Sergio Cerri
- Laboratory of Histology and Embryology, Department of Morphology, Genetics, Orthodontics and Pediatric Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), São Paulo 14801-903, Brazil;
| | - Bhumika Shokeen
- School of Dentistry, University of California at Los Angeles (UCLA), Los Angeles, CA 90095, USA; (B.S.); (R.L.)
| | - Renate Lux
- School of Dentistry, University of California at Los Angeles (UCLA), Los Angeles, CA 90095, USA; (B.S.); (R.L.)
| | - Ewerton Garcia de Oliveira Mima
- Laboratory of Applied Microbiology, Department of Dental Materials and Prosthodontics, School of Dentistry, Araraquara, São Paulo State University (UNESP), São Paulo 14801-903, Brazil; (V.T.S.); (Y.V.-C.)
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Popescu MC, Bita BI, Tucureanu V, Vasilache D, Banu MA, Avram AM, Giurescu-Dumitrescu RA. Superficial and Inner Examination of a Microwave-Irradiated Dental Acrylic Resin and Its Metal-Polymer Interface. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2018; 24:49-59. [PMID: 29485028 DOI: 10.1017/s1431927618000089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The aim of this study is to conduct an extended surface and cross-section characterization of a denture base acrylic resin subjected to 500, 650, and 750 W microwave irradiation for 2, 3, and 5 min to assess its morphological modifications. A commercial heat-cured powder was polymerized according to the manufacturer's specifications and distributed into 20 circular samples. A stainless-steel wire was partially embedded in half of the discs, in order to investigate the metal-polymer interface. High-resolution scanning electron microscopy (SEM) imaging, white light interferometry, roughness measurements and Fourier transform infrared spectrometry were employed for morphological and structural evaluation of the irradiated polymer. Superficial adaptation was discovered after 5 min exposure at 500 W, 650 W, and 750 W, revealing significant roughness correction for 750 W. SEM characterization revealed the inner alteration of the resin for the 750 W protocol and a metal-polymer gap developed regardless of the irradiation conditions. The considerable temperature fluctuations that the samples were subject to during the experiments did not essentially change the poly(methyl-methacrylate) bond structure.
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Affiliation(s)
- Marian C Popescu
- 1Nano-Scale Structuring and Characterization Laboratory,National Institute for Research and Development in Microtechnologies,126A Erou Iancu Nicolae Street,077190 Bucharest,Romania
| | - Bogdan I Bita
- 1Nano-Scale Structuring and Characterization Laboratory,National Institute for Research and Development in Microtechnologies,126A Erou Iancu Nicolae Street,077190 Bucharest,Romania
| | - Vasilica Tucureanu
- 3Laboratory for Micro- and Nanofluidics,National Institute for Research and Development in Microtechnologies,126A Erou Iancu Nicolae Street,077190 Bucharest,Romania
| | - Dan Vasilache
- 5Microwave Circuits and Devices Laboratory,Micromachined Structures,National Institute for Research and Development in Microtechnologies,126A Erou Iancu Nicolae Street,077190 Bucharest,Romania
| | - Melania A Banu
- 6Laboratory of Nanobiotechnology,National Institute for Research and Development in Microtechnologies,126A Erou Iancu Nicolae Street,077190 Bucharest,Romania
| | - Andrei M Avram
- 3Laboratory for Micro- and Nanofluidics,National Institute for Research and Development in Microtechnologies,126A Erou Iancu Nicolae Street,077190 Bucharest,Romania
| | - Raluca A Giurescu-Dumitrescu
- 8Disciplines of Dental Medicine Department, Faculty of Dental Medicine,Titu Maiorescu University,67A Gheorghe Petrascu Street,031593 Bucharest,Romania
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Robati Anaraki M, Mahboubi S, Pirzadeh T, Lotfipour F, Torkamanzad N. Disinfection effect of microwave radiation on Bacillus subtilis as indicator organism on contaminated dental stone casts under dry and wet conditions. GMS HYGIENE AND INFECTION CONTROL 2017; 12:Doc09. [PMID: 28840089 PMCID: PMC5550743 DOI: 10.3205/dgkh000294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Objective: The disinfection of dental stone casts using microwave radiation has been shown, but doubts remain regarding its efficacy under various conditions. The aim of the present study was to evaluate the efficacy of microwave disinfection on wet and dry dental stone casts contaminated by a resistant microorganism. Material and methods: In this in vitro study, 34 stone half-casts were prepared, contaminated with Bacillus subtilis and divided into two groups. After drying the specimens of one group for 15 minutes using 450 W microwave energy, all the wet and dry specimens were exposed to 900 W microwave energy for 5 minutes. Specimens were then individually transferred to nutrient broth culture medium and after 10 minutes, one milliliter from each tube was cultured in nutrient agar media for 24 hours, and the colonies were counted in CFU/mL. Data were analyzed using multifactorial ANOVA and Bonferroni tests. Results: Casts in both wet and dry groups were disinfected to a high level (6 log), with no statistically significant differences between them (P<0.05). Conclusion: According to the results, microwave irradiation can disinfect dental stone casts to a high degree, irrespective of moisture level. However, the result should be confirmed by exploring with other species of resistant microorganisms.
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Affiliation(s)
- Mahmood Robati Anaraki
- Dental and Periodontal Research Center, Tabriz University of Medical Science, Tabriz, Iran.,Department of Prosthetic Dentistry, Dental School, Tabriz University of Medical Science, Tabriz, Iran
| | - Shiva Mahboubi
- Department of Prosthetic Dentistry, Dental School, Kurdistan University of Medical Science, Sanandaj, Iran
| | - Tahereh Pirzadeh
- Department of Microbiology, Medical School, Tabriz University of Medical Science, Tabriz, Iran
| | - Farzaneh Lotfipour
- Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
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Shafeeq SM, Karthikeyan S, Reddy SM, Karthigeyan S, Manikandan R, Thangavelu A. Cumulative effect of microwave sterilization on the physical properties of microwave polymerized and conventional heat-polymerized acrylic resin. J Pharm Bioallied Sci 2016; 8:S100-S104. [PMID: 27829757 PMCID: PMC5074008 DOI: 10.4103/0975-7406.191935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Aims: To evaluate and compare the flexural strength and impact strength of conventional and microwave cured denture base resins before and after repeated sterilization using microwave energy to consider microwave curing as an alternative to the conventional method of sterilization. Materials and Methods: The conventional heat cure acrylic resin (DPI heat cure material) Group A and microwave-polymerized acrylic resin (Vipi Wave Acrylic resin) Group B were used to fabricate 100 acrylic resins samples using a standard metal die of (86 mm × 11 mm × 3 mm) dimensions. The criterion was flexural strength and impact strength testing which had Group A and Group B samples; 50 samples for flexural strength and 50 samples for impact strength measurement. For each criterion, five control samples were taken for Group A and Group B. The samples were stored in water before experimenting. The test samples were subject to four cycles of microwave sterilization; followed by flexural strength testing with a 3-point flexural test in universal testing machine (UNITEK 94100) and impact strength testing with impact testing machine (ENKAY Pr09/E1/16). Results: The physical properties had significant changes for conventionally cured denture base resins, whereas no changes found for microwave-cured resins after repeated sterilization cycles.
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Affiliation(s)
- S Mohammed Shafeeq
- Department of Prosthodontics, Vivekanandha Dental College for Women, Tiruchengode, Tamil Nadu, India
| | - S Karthikeyan
- Department of Prosthodontics, Vivekanandha Dental College for Women, Tiruchengode, Tamil Nadu, India
| | - Subash M Reddy
- Department of Prosthodontics, Oxford Dental College, Bengaluru, Karnataka, India
| | - Suma Karthigeyan
- Department of Prosthodontics, Rajah Muthaiah Dental College, Chidambaram, Tamil Nadu, India
| | - R Manikandan
- Department of Prosthodontics, Vivekanandha Dental College for Women, Tiruchengode, Tamil Nadu, India
| | - Arthiie Thangavelu
- Department of Periodontics, J.K.K. Nataraja Dental College, Komarapalayam, Tamil Nadu, India
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Polychronakis N, Yannikakis S, Zissis A. The Effect of Repeated Microwaving Disinfection on the Dimensional Stability of Acrylic Dentures. Acta Stomatol Croat 2016; 48:279-84. [PMID: 27688376 DOI: 10.15644/asc48/4/5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
OBJECTIVE The aim of this study was to evaluate the effect of repeated microwave disinfections on the dimensional stability of acrylic dentures. MATERIALS AND METHODS Three groups of dentures made of a heat polymerized acrylic resin were tested. I: dentures kept in water (control group). II: dentures microwaved daily while being immersed into water (wet disinfection). III: dentures microwaved daily without being immersed into water (dry disinfection).
Measurements were taken across three reference points, on two occasions: after curing and immersion in water for 24 hours, and one week later.
Data obtained were analyzed using one-way analysis of variance (ANOVA) and Scheffe's multiple range test. RESULTS The results showed that the microwave disinfection provokes dimensional changes of the same pattern (shrinkage). The dentures which underwent wet disinfection exhibited the greatest shrinkage (p<0.05). CONCLUSIONS Disinfection using microwave energy may cause dimensional changes (shrinkage) of complete dentures.
The microwave "dry disinfection" method can be safely applied in everyday practice since the dimensional changes which occurred seem to be of no clinical significance.
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Affiliation(s)
- Nick Polychronakis
- Assistant Professor, Division of Removable Prosthodontics, Dental School, National and Kapodistrian University of Athens, Greece
| | - Stavros Yannikakis
- Professor, Department of Dental Technology, Division of Removable Prosthodontics, Technological Educational Institution of Athens, Greece
| | - Alcibiades Zissis
- Associate Professor, Division of Removable Prosthodontics, Dental School, National and Kapodistrian University of Athens, Greece
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Quishida CCC, De Oliveira Mima EG, Jorge JH, Vergani CE, Bagnato VS, Pavarina AC. Photodynamic inactivation of a multispecies biofilm using curcumin and LED light. Lasers Med Sci 2016; 31:997-1009. [PMID: 27126412 DOI: 10.1007/s10103-016-1942-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 04/20/2016] [Indexed: 01/19/2023]
Abstract
This study evaluated the potential of curcumin-mediated antimicrobial photodynamic inactivation (API) on multispecies biofilms of Candida albicans, Candida glabrata, and Streptococcus mutans of different ages. Acrylic samples (n = 480) were made with standardized rough surfaces and incubated with bacteria and yeast for 24 or 48 h. API was performed with curcumin (80, 100, 120 μM) and LED light. Additional acrylic samples were treated with curcumin or LED light only. Positive control samples received neither light nor curcumin. After API, colony counts were quantified (CFU/mL), cell metabolism was determined by means of XTT assay, and the total biofilm biomass was evaluated using Crystal Violet (CV) staining assay and images were obtained by confocal laser scanning microscopy (CLSM). The data were analyzed by nonparametric two-way ANOVA and post hoc Tukey tests (α < 0.05). For 24-h biofilm, API resulted in statistically significant difference (ρ < 0.001) of viability of C. albicans compared with control (P-L-) for all Cur concentrations. For 48-h biofilm, API resulted in statistically significant difference (ρ < 0.001) compared with control only when Cur at 120 μM was used. API promoted statistically significant difference (ρ ≤ 0.001) in the viability of S. mutans and C. glabrata for all Cur concentrations in the two biofilm ages. In addition, API produced a statistically significant difference (ρ < 0.001) of metabolic activity and of total biomass (ρ < 0.001) of multispecies biofilms compared with control for all Cur concentrations. It can be concluded that both 24- and 48-h biofilms were susceptible to API mediated by Cur; however, 24-h biofilm was more sensitive than the 48-h biofilm.
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Affiliation(s)
- Cristiane Campos Costa Quishida
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, UNESP, Univ Estadual Paulista, São José dos Campos, School of Dentistry - Avenida Engenheiro Francisco José Longo 777, CEP 12245-000, São José dos Campos, SP, Brazil
| | - Ewerton Garcia De Oliveira Mima
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil
| | - Janaina Habib Jorge
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil
| | - Carlos Eduardo Vergani
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil
| | - Vanderlei Salvador Bagnato
- Physics Institute of São Carlos, USP, University of São Paulo, Av. Trabalhador São-Carlense, 400, CEP 13566-590, São Carlos, SP, Brazil
| | - Ana Cláudia Pavarina
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil.
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Basso MFM, Giampaolo ET, Vergani CE, Pavarina AC, Machado AL, Jorge JH. Occlusal Pressure Analysis of Complete Dentures after Microwave Disinfection: A Clinical Study. J Prosthodont 2015; 26:606-610. [DOI: 10.1111/jopr.12429] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/14/2015] [Indexed: 11/30/2022] Open
Affiliation(s)
| | - Eunice Teresinha Giampaolo
- Department of Dental Materials and Prosthodontics, Araraquara Dental School; UNESP - Univ Estadual Paulista; Araraquara Brazil
| | - Carlos Eduardo Vergani
- Department of Dental Materials and Prosthodontics, Araraquara Dental School; UNESP - Univ Estadual Paulista; Araraquara Brazil
| | - Ana Cláudia Pavarina
- Department of Dental Materials and Prosthodontics, Araraquara Dental School; UNESP - Univ Estadual Paulista; Araraquara Brazil
| | - Ana Lúcia Machado
- Department of Dental Materials and Prosthodontics, Araraquara Dental School; UNESP - Univ Estadual Paulista; Araraquara Brazil
| | - Janaina Habib Jorge
- Department of Dental Materials and Prosthodontics, Araraquara Dental School; UNESP - Univ Estadual Paulista; Araraquara Brazil
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Quishida CCC, Mima EGDO, Dovigo LN, Jorge JH, Bagnato VS, Pavarina AC. Photodynamic inactivation of a multispecies biofilm using Photodithazine(®) and LED light after one and three successive applications. Lasers Med Sci 2015; 30:2303-12. [PMID: 26404782 DOI: 10.1007/s10103-015-1811-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2014] [Accepted: 09/14/2015] [Indexed: 11/30/2022]
Abstract
In this investigation, the effectiveness of successive applications of antimicrobial photodynamic inactivation (API) mediated by Photodithazine(®) (PDZ) and LED light was evaluated against a multispecies biofilm formed by Candida albicans, Candida glabrata, and Streptococcus mutans on denture base acrylic resin. Standard cell suspensions (bacteria and yeast) were inoculated on acrylic resin samples, and the biofilm was grown for 48 h (37 °C/75 rpm). API was performed by the administration of PDZ (175 and 200 mg/L) and exposure to 37.5 J/cm(2) of LED light (660 nm). Additional samples were treated with PDZ or LED light only. Untreated control samples were not submitted to light or PDZ. The conditions described were applied once or in three consecutive applications for all groups. Cell viability was determined by colony counts (CFU/mL), metabolic activity, total biomass, and confocal laser scanning microscopy (CLSM). Data were analyzed by a nonparametric two-way ANOVA and Tukey tests (α = 0.05). The results obtained demonstrated a significant effect (p < 0.05) of number of applications and treatment groups for CFU/mL, and S. mutans showed the highest susceptibility to API. The metabolic activity of the multispecies biofilm was significantly reduced (p < 0.05) after API for both numbers of applications, which were also significantly different (p < 0.05) between them. The total biomass of the biofilm was significantly different (p < 0.05) only between groups submitted to one and three API applications. CLSM showed a visual increase of dead cells after API. API-mediated PDZ was effective in reducing the cell viability of multispecies biofilm. Three consecutive applications of API were more effective for reducing the cell viability and the total biomass of multispecies biofilm.
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Affiliation(s)
- Cristiane Campos Costa Quishida
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil.
| | - Ewerton Garcia de Oliveira Mima
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil.
| | - Lívia Nordi Dovigo
- Department of Social Dentistry, Araraquara Dental School, UNESP - Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil.
| | - Janaina Habib Jorge
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil.
| | - Vanderlei Salvador Bagnato
- Physics Institute of São Carlos, USP, University of São Paulo, Av. Trabalhador São-Carlense, 400, CEP: 13566-590, São Carlos, SP, Brazil.
| | - Ana Cláudia Pavarina
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP, Univ Estadual Paulista, Rua Humaitá 1680, CEP 14801-903, Araraquara, SP, Brazil.
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Klironomos T, Katsimpali A, Polyzois G. The Effect of Microwave Disinfection on Denture Base Polymers, Liners and Teeth: A Basic Overview. Acta Stomatol Croat 2015; 49:242-53. [PMID: 27688409 PMCID: PMC4993596 DOI: 10.15644/asc49/3/7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Accepted: 06/29/2015] [Indexed: 10/31/2022] Open
Abstract
The aim of this paper was to overview the current scientific knowledge concerning the effect of microwave disinfection on denture related material properties. Cross-infection control in dentistry is a significant issue in everyday clinical practice due to the recent increase in some infectious diseases such as hepatitis B, C and AIDS and therefore numerous methods of disinfection have been used. The most widespread method of disinfection used in everyday practice is chemical, however, studies have suggested that chemical disinfectants alter the physical and mechanical properties of the acrylic resins and enable the growth and proliferation of certain bacteria. Therefore, microwaves were introduced as an easy to use-and-access, low cost, chemical free alternative. The question that arose was if and in what way the microwave irradiation affected the denture related material properties. Microwaving affects the denture resin bases, liners and teeth in different ways. The results showed that microwave disinfection could be a safe alternative for the disinfection of denture bases and liners compared to the chemical one, when the procedure is carried out in dry conditions, but could possibly cause dimensional changes of clinical significance on them when the irradiation takes place in wet environment. It also seems to have no detrimental effects of clinical importance on the flexural properties, impact strength and hardness of denture resins and the bond, flexural strength, porosity and hardness of denture liners. The effects of microwave disinfection on the hardness of denture teeth and teeth/denture bond strength are still controversial and no safe conclusions can be drawn.
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Affiliation(s)
| | | | - Gregory Polyzois
- Professor, Department of Removable Prosthodontics, Dental School, University of Athens, Athens, Greece
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Choi YR, Kim KN, Kim KM. The disinfection of impression materials by using microwave irradiation and hydrogen peroxide. J Prosthet Dent 2014; 112:981-7. [DOI: 10.1016/j.prosdent.2013.12.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 12/19/2013] [Accepted: 12/27/2013] [Indexed: 10/25/2022]
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Rodríguez Acosta EJT, da Silva PMB, Jacobina M, Lara VS, Neppelenbroek KH, Porto VC. Candida albicans adherence to denture base material: chemical disinfection and the effect of acquired salivary pellicle formation. J Prosthodont 2014; 24:200-6. [PMID: 25142962 DOI: 10.1111/jopr.12197] [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] [Accepted: 03/14/2014] [Indexed: 11/30/2022] Open
Abstract
PURPOSE The aim of this study was to evaluate the effect of 1% sodium hypochlorite (H1%) and 4% chlorhexidine gluconate (CG4%) on the adhesion of Candida albicans to denture base acrylic resins, as well as to verify the effect of the acquired salivary pellicle (ASP) formation on this process. MATERIALS AND METHODS A total of 300 acrylic specimens were immersed in distilled water (control) (n = 100), H1% (n = 100), or CG4% (n = 100) for 30 days. Twenty specimens were used in each experimental period (0, 1, 7, 15, 30 days). At the end of disinfection testing periods, 10 specimens of each group were exposed to human whole saliva to simulate ASP formation, and then all specimens were incubated with C. albicans ATTC 90028. Microorganism adhesion was analyzed by fluorescence microscopy, after staining with Acridine orange. RESULTS In the 30(th) disinfection cycle in relation to baseline, the H1% or CG4%, without ASP formation, reduced the C. albicans adhesion by approximately 80%; however, with ASP, this reduction after disinfection with H1% was higher (88%). The presence of ASP resulted in higher reduction of adhered fungal cells in comparison to resin without ASP, at the 1(st) H1% or CG4% disinfection cycle, as well as at 30(th) H1% disinfection cycles. CONCLUSIONS Our results suggest that the presence of saliva might influence the adhesion of C. albicans and improve the effectiveness of methods to reduce fungal adhesion.
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Wagner DA, Pipko DJ. The effect of repeated microwave irradiation on the dimensional stability of a specific acrylic denture resin. J Prosthodont 2014; 24:25-31. [PMID: 25082075 DOI: 10.1111/jopr.12203] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/18/2014] [Indexed: 01/28/2023] Open
Abstract
PURPOSE To determine the dimensional stability of a poly(methyl methacrylate) (PMMA) acrylic resin when subjected to multiple sessions of repeated microwave irradiation at power settings of 700 and 420 W. MATERIALS AND METHODS Twenty standardized denture bases were fabricated using a PMMA resin. Points of measurement were marked on each denture base with a standardized template, and the distances between points were recorded using a digital microscope. The denture bases were randomly placed into two experimental groups of 10 bases each. Individual denture bases were placed into a glass beaker containing 200 ml of room temperature deionized water and then exposed to either 700 or 420 W of microwave radiation for 3 minutes. The denture bases were allowed to cool to room temperature, and measurements between points were recorded. This process was carried out for two microwave periods with measurements being completed after each period. The data were then analyzed for any significant changes in distances between points using a Student's t-test. RESULTS All denture bases experienced 1.0 to 2.0 mm or approximately 3% linear dimensional change after each period of microwaving. Results were significant with all t-tests having values of p < 0.05. CONCLUSION This report showed that the denture bases deformed significantly under experimental conditions at either 700 W for 3 minutes in 200 ml of water or 420 W for 3 minutes in 200 ml of water.
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Affiliation(s)
- David A Wagner
- Former Prosthodontic Resident, University of Pittsburgh, School of Dental Medicine, Pittsburgh, PA
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Izumida FE, Moffa EB, Vergani CE, Machado AL, Jorge JH, Giampaolo ET. In vitro evaluation of adherence of Candida albicans, Candida glabrata, and Streptococcus mutans to an acrylic resin modified by experimental coatings. BIOFOULING 2014; 30:525-533. [PMID: 24684564 DOI: 10.1080/08927014.2014.894028] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This study evaluated the effect of experimental coatings, containing zwitterion or hydrophilic monomers, on the adherence of Candida albicans, Candida glabrata, and Streptococcus mutans to an acrylic resin. Acrylic samples (smooth or rough surfaces) were left untreated (control) or coated with one of the following experimental coatings: 3-hydroxypropylmethacrylate (HP) or sulfobetaine methacrylate (S), at concentrations of 25, 30, or 35%. Half of the specimens were coated with saliva. The adhesion test was performed by incubating specimens in C. albicans, C. glabrata, and S. mutans suspensions at 37°C for 90 min. The number of adhered microorganisms was determined by metabolic activity (XTT) and by cell viability (CFU). All coated specimens exhibited lower absorbance and CFU values compared to control specimens. Saliva and roughness did not promote microorganism adherence. An XPS analysis confirmed the modification in the chemical composition of the coatings in the experimental samples. These experimental coatings significantly reduced the adherence of C. albicans, C. glabrata and S. mutans to acrylic resin.
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Affiliation(s)
- Fernanda Emiko Izumida
- a Department of Dental Materials and Prosthodontics, Araraquara Dental School , Universidade Estadual Paulista, UNESP , São Paulo , Brazil
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Evaluation of effectiveness of microwave irradiation for disinfection of silicone elastomeric impression material. J Indian Prosthodont Soc 2014; 13:89-94. [PMID: 24431716 DOI: 10.1007/s13191-012-0230-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Accepted: 11/29/2012] [Indexed: 10/27/2022] Open
Abstract
Use of domestic microwave oven has been suggested as a method of disinfecting a number of dental materials used in dental practice. This study was done to analyse the effect of microwave irradiation on vinyl polysiloxane putty impression material (3M ESPE, Express™ STD) contaminated with test organisms (Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans. 180 square shaped specimens of addition silicon putty material were prepared and divided into 3 groups for three test organisms. The 3 groups were subdivided into 4 subgroups (n = 15) for different exposure parameters (control group 5, 6 and 7 min exposure at 650 W. The specimens were contaminated using standard inoculums of test organism and then were irradiated using domestic microwaves. Broth cultures of the control and test group specimens were plated on selective media culture plates. Colonies formed were counted. Data analyses included Kruskal-Walli's ANOVA and Mann-Whitney's tests. Nil values shows complete elimination of C. albicans and P. aeruginosa after 5, 6 and 7 min exposure. Staphylococcus aureus showed colonies with the mean value of 7.6 × 10(3) ± 2.3 × 10(3), 4.6 × 10(3) ± 2.6 × 10(3) after 5 and 6 min respectively and nil values after 7 min exposure. 5 min exposure caused complete elimination of C. albicans and P. aeruginosa strains, while 7 min exposure eliminated S. aureus completely.
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Sesma N, Rocha AL, Laganá DC, Costa B, Morimoto S. Effectiveness of denture cleanser associated with microwave disinfection and brushing of complete dentures: in vivo study. Braz Dent J 2013; 24:357-61. [PMID: 24173256 DOI: 10.1590/0103-6440201302205] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 06/14/2013] [Indexed: 11/22/2022] Open
Abstract
Complete dentures acts as a reservoir for microbial colonization, which may lead to systemic infections. Microwave irradiation has been used as an efficient method of denture disinfection. Even though current methods eliminate denture-base microorganisms, a recurrence rate of denture stomatitis (DS) is still observed among denture-wearing patients. It was hypothesized that microwave disinfection kills microorganisms but do not remove dead bacteria from the denture surface. To test this hypothesis, the biofilm found in the dentures of 10 patients with DS was evaluated. In addition, the effects of microwave irradiation plus brushing (MW+B) on the denture biofilm and the combination of denture cleanser with microwave irradiation and brushing (MW+DC+B) for the removal of denture-accumulating microorganisms were investigated. Microbiological data were analyzed statistically by nonparametric analysis (Friedman/Wilcoxon, α=0.05). MW+B and MW+DC+B were effective in reducing the rate of microorganisms (99.2% and 99.5% respectively), but without significant difference between them (p=0.553). However, it was observed that the complete removal of microorganisms from denture surface was only possible when all regimens were combined (MW+DC+B). Microwave irradiation in combination with soaking in denture cleanser and brushing effectively disinfected the dentures and removed denture biofilm.
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Affiliation(s)
- Newton Sesma
- Department of Prosthodontics, School of Dentistry, USP - University of São Paulo, São PauloSP, Brazil
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Robati Anaraki M, Lotfipour F, Moslehifard E, Momtaheni A, Sigari P. Effect of different energy levels of microwave on disinfection of dental stone casts. J Dent Res Dent Clin Dent Prospects 2013; 7:140-6. [PMID: 24082984 PMCID: PMC3779372 DOI: 10.5681/joddd.2013.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Accepted: 03/12/2013] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND AND AIMS Current chemical methods may not efficiently disinfect dental stone casts. The aim of this study was to investigate if microwave irradiation is effective for disinfection of stone casts. MATERIALS AND METHODS In this laboratory study, three groups (n = 162) of prepared spherical stone beads as carriers with a diameter of 10 mm were inoculated by separately soaking in three broth culture media, each containing a study microorganism-Pseudomonas aeruginosa, Staphylococcus aureus or Candida albicans. Six inoculated carriers were used for every test, including irradiation in a household microwave oven at 300, 450, 600 or 900 W energy level, or soaking in 0.03%, 0.06%, 0.12%, 0.25% or 0.50% concentration of sodium hypochlorite solution, at 1, 2, or 3-minute test times. Positive and negative control groups were considered for each test. All treated carriers were then individually transferred to nutrient broth culture medium and one milliliter from each tube was cultured in nutrient agar media over night. Colony forming unit per milliliter (CFU/mL) was counted, and multi-factor ANOVA was used to analyze data (α = 0.05). RESULTS Microwave irradiation at 600 W resulted in high-level disinfection in 3 minutes. Immersion of the stone casts in hypochlorite solution at 0.06% concentration resulted in disinfection after 2 minutes. CONCLUSION According to the results, high level disinfection of the stone casts can be achieved by microwave irradiation at 600 W in 3 minutes, similar to a validated chemical method.
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Affiliation(s)
- Mahmood Robati Anaraki
- Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran ; Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
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Skupien JA, Valentini F, Boscato N, Pereira-Cenci T. Prevention and treatment of Candida colonization on denture liners: a systematic review. J Prosthet Dent 2013; 110:356-62. [PMID: 23998622 DOI: 10.1016/j.prosdent.2013.07.003] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
STATEMENT OF PROBLEM Denture liners are well known for their poor physical properties that favor the accumulation of plaque and colonization by Candida species, which can irritate the oral tissues and lead to denture stomatitis. PURPOSE A systematic review was conducted to determine the feasibility of a prevention protocol for Candida colonization in denture liners and an effective treatment after the fungi has colonized the material. MATERIAL AND METHODS Clinical and in vitro investigations that assessed the treatment and/or prevention of Candida colonization and biofilm formation in denture liners were selected according to the PRISMA statement. Seven electronic databases were searched from 1950 to April 2012 with the keywords "denture liner" OR "reline*" OR "tissue conditioner" AND "Candida" OR "denture stomatitis" OR "oral candidiasis" OR "antifungal agents" OR "denture clean*". RESULTS The incorporation of nystatin (in general, 500 000 units) into tissue conditioners to prevent the onset of the disease and immersion in sodium hypochlorite for disinfection were the methods most often described in this systematic review, and both methods were able to prevent or inhibit Candida colonization, depending on their concentrations. The 0.5% sodium hypochlorite concentration can disinfect tissue conditioners and denture liners. Microwave irradiation has also been described an alternative method of disinfection. Because of a lack of standardized results (especially with regard to the method used to perform microbial counts), a meta-analysis could not be performed. CONCLUSIONS The literature suggests that the use of 0.5% sodium hypochlorite can help disinfect denture liners and tissue conditioners. The incorporation of nystatin in those materials is also able to treat or prevent oral candidiasis. However, as most of the studies were in vitro, there is insufficient reliable evidence to truly provide recommendations regarding the ideal cleaning method or whether the addition of antifungal agents is worthwhile. Well-designed randomized controlled trials are needed to provide answers to these questions.
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Affiliation(s)
- Jovito Adiel Skupien
- Graduate student, Graduate Program in Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil
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Silva MM, Mima EGDO, Colombo AL, Sanitá PV, Jorge JH, Massucato EMS, Vergani CE. Comparison of denture microwave disinfection and conventional antifungal therapy in the treatment of denture stomatitis: a randomized clinical study. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 114:469-79. [PMID: 22986242 DOI: 10.1016/j.oooo.2012.05.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 05/10/2012] [Accepted: 05/14/2012] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The aim of this study was to compare the effectiveness of denture microwave disinfection and antifungal therapy on treatment of denture stomatitis. STUDY DESIGN Sixty denture wearers with denture stomatitis (3 groups; n = 20 each), were treated with nystatin or denture microwave disinfection (1 or 3 times/wk) for 14 days. Mycologic samples from palates and dentures were quantified and identified with the use of Chromagar, and clinical photographs of palates were taken. Microbiologic and clinical data were analyzed with the use of a series of statistical tests (α = .05). RESULTS Both treatments similarly reduced clinical signs of denture stomatitis and growth on palates and dentures at days 14 and 30 (P > .05). At sequential appointments, the predominant species (P < .01) isolated was C. albicans (range 98%-53%), followed by C. glabrata (range 22%-12%) and C. tropicalis (range 25%-7%). CONCLUSIONS Microwave disinfection, at once per week for 2 treatments, was as effective as topical antifungal therapy for treating denture stomatitis.
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Microwave Maceration of Pinot Noir Grape Must: Sanitation and Extraction Effects and Wine Phenolics Outcomes. FOOD BIOPROCESS TECH 2013. [DOI: 10.1007/s11947-013-1112-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Robati Anaraki M, Moslehifard E, Aminifar S, Ghanati H. Effect of microwave disinfection on compressive and tensile strengths of dental stones. J Dent Res Dent Clin Dent Prospects 2013; 7:42-6. [PMID: 23487305 PMCID: PMC3593204 DOI: 10.5681/joddd.2013.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 12/25/2012] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND AND AIMS Although microwave irradiation has been used for disinfection of dental stone casts, there are concerns regarding mechanical damage to casts during the process. The aim of this study was to evaluate the effect of microwave irradiation on the compressive strength (CS) and diametral tensile strength (DTS) of stone casts. MATERIALS AND METHODS In this in vitro study, 80 cylindrical type III and IV stone models (20 × 40 mm) were prepared and divided into 8 groups of 10. The DTS and CS of the specimens were measured by a mechanical testing machine at a crosshead speed of 0.5 cm/min after 7 times of frequent wetting, irradiating at an energy level of 600 W for 3 minutes and cooling. Data were analyzed by Student's t-test. RESULTS Microwave irradiation significantly increased DTS of type III and IV to 5.23 ± 0.64 and 8.17 ± 0.94, respectively (P < 0.01). CONCLUSION According to the results, microwave disinfection increases DTS of type III and IV stone casts without any effects on their CS.
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Affiliation(s)
- Mahmood Robati Anaraki
- Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elnaz Moslehifard
- Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Soran Aminifar
- Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Hamed Ghanati
- Undergraduate Student, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
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Chamele J, Bhat C, Saraf T, Jadhav A, Beg A, Jagtap C, Ubeja R, Patil P. Efficacy of microwaves and chlorhexidine for disinfection of pacifiers and toothbrushes: an in vitro study. J Contemp Dent Pract 2012; 13:690-694. [PMID: 23250176 DOI: 10.5005/jp-journals-10024-1210] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
PURPOSE The purpose of this study was to evaluate, in vitro, the contamination of toothbrushes and pacifiers by Streptococcus mutans, and the efficacy of microwave and chlorhexidine for their disinfection. MATERIALS AND METHODS Sixty pacifiers and 60 toothbrushes were contaminated with S. mutans and then divided into groups according to the disinfection protocol: Group 1-chlorhexidine solution; group 2-microwave sterilization; and group 3-sterile tap water. The devices were evaluated microbiologically after disinfection for the survival of S. mutans colonies and were examined. The results were analyzed statistically by ANOVA and Turkey test. RESULTS The results of both types of evaluation showed a large number of S. mutans colonies after spraying with sterile tap water, and chlorhexidine spraying and microwaving were effective in eliminating colonies. Groups 1 and 2 were statistically similar to each other (p > 0.05) and differed significantly from group 3 (p < 0.05). CONCLUSION The 0.12% chlorhexidine solution spray and 7 minutes of microwave irradiation were almost equally effective for disinfection of pacifiers and toothbrushes.
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Affiliation(s)
- Jay Chamele
- Department of Pedodontics and Preventive Dentistry, Bharati Vidyapeeth Dental College, Pune-411043 Maharashtra, India.
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Attwa AM, Al-Akhali MA, Mtwaly AF, Taha AR. Effect of the microwave irradiation on disinfection of complete denture lined with soft resilient liner. Indian J Dent 2012. [DOI: 10.1016/j.ijd.2012.03.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Senna PM, Sotto-Maior BS, Silva WJD, Del Bel Cury AA. Adding denture cleanser to microwave disinfection regimen to reduce the irradiation time and the exposure of dentures to high temperatures. Gerodontology 2012; 30:26-31. [DOI: 10.1111/j.1741-2358.2012.00641.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Effectiveness of two disinfectant solutions and microwave irradiation in disinfecting complete dentures contaminated with methicillin-resistant Staphylococcus aureus. J Am Dent Assoc 2012; 143:270-7. [DOI: 10.14219/jada.archive.2012.0152] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Lombardo CEL, Canevarolo SV, dos Santos Nunes Reis JM, Machado AL, Pavarina AC, Giampaolo ET, Vergani CE. Effect of microwave irradiation and water storage on the viscoelastic properties of denture base and reline acrylic resins. J Mech Behav Biomed Mater 2012; 5:53-61. [DOI: 10.1016/j.jmbbm.2011.09.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Accepted: 09/20/2011] [Indexed: 11/26/2022]
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Basso MFM, Giampaolo ET, Machado AL, Pavarina AC, Vergani CE. Evaluation of the occlusion vertical dimension of complete dentures after microwave disinfection. Gerodontology 2011; 29:e815-21. [DOI: 10.1111/j.1741-2358.2011.00567.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Senna PM, Da Silva WJ, Faot F, Del Bel Cury AA. Microwave disinfection: cumulative effect of different power levels on physical properties of denture base resins. J Prosthodont 2011; 20:606-12. [PMID: 21980952 DOI: 10.1111/j.1532-849x.2011.00770.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
PURPOSE This study evaluated the cumulative effects of different microwave power levels on the physical properties of two poly(methylmethacrylate) (PMMA) denture base resins. MATERIALS AND METHODS Eight sets of four PMMA specimens each (two polymerized in a water bath and two using microwave energy) were immersed in beakers containing 200 ml of distilled water. Each beaker was subjected to microwave irradiation for 3 minutes at a power level of 450,630, or 900 W. The surface roughness, surface hardness, linear stability, flexural strength, elastic modulus, impact strength, and fractographic properties were evaluated after either 6 or 36 simulated disinfection cycles. The data were statistically analyzed using ANOVA and the Tukey post hoc test (α= 0.05). RESULTS The polymerization method did not influence any property (p > 0.05) except linear stability. The surface roughness (p < 0.001) and hardness (p= 0.011) increased after 36 irradiation cycles at 630 or 900 W. The resin polymerized using microwave energy exhibited greater linear distortion (p= 0.012), and there was a cumulative effect on linear stability for both resins (p < 0.001). No significant change (p > 0.05) was observed in flexural strength; however, the elastic modulus decreased (p= 0.008) after 36 disinfection cycles. The impact strength and crack propagation angles displayed no significant differences (p > 0.05). CONCLUSION Within the limitations of this study, it can be concluded that microwave disinfection at 450 W to 630 W for 3 minutes is safe for PMMA.
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Affiliation(s)
- Plinio M Senna
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil.
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Felton D, Cooper L, Duqum I, Minsley G, Guckes A, Haug S, Meredith P, Solie C, Avery D, Deal Chandler N. Evidence-based guidelines for the care and maintenance of complete dentures: a publication of the American College of Prosthodontists. J Prosthodont 2011; 20 Suppl 1:S1-S12. [PMID: 21324026 DOI: 10.1111/j.1532-849x.2010.00683.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The current rates of edentulism have been estimated to be between 7% and 69% of the adult population internationally. In the United States, while the incidence of edentulism continues to decline, rapid population growth coupled with current economic conditions suggest that edentulism and conventional denture use will continue at current or higher numbers. Unfortunately, evidence-based guidelines for the care and maintenance of removable complete denture prostheses do not exist. In 2009, the American College of Prosthodontists (ACP) formed a task force to establish evidence-based guidelines for the care and maintenance of complete dentures. The task force comprised members of the ACP, the Academy of General Dentistry, American Dental Association (ADA) Council on Scientific Affairs, the American Dental Hygienists' Association, the National Association of Dental Laboratories, and representatives from GlaxoSmithKline Consumer Healthcare. The review process included the assessment of over 300 abstracts and selection of over 100 articles meeting inclusion criteria of this review. The task force reviewed synopses of the literature and formulated 15 evidence-based guidelines for denture care and maintenance. These guidelines were reviewed by clinical experts from the participating organizations and were published in February 2011 issue of The Journal of the American Dental Association for widespread distribution to the dental community. These guidelines reflect the views of the task force.
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Affiliation(s)
- David Felton
- Department of Prosthodontics, School of Dentistry, University of North Carolina-Chapel Hill, Chapel Hill, NC 27599, USA.
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da Silva PMB, Acosta EJTR, de Rezende Pinto L, Graeff M, Spolidorio DMP, Almeida RS, Porto VC. Microscopical analysis of Candida albicans biofilms on heat-polymerised acrylic resin after chlorhexidine gluconate and sodium hypochlorite treatments. Mycoses 2011; 54:e712-7. [DOI: 10.1111/j.1439-0507.2010.02005.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Senna PM, da Silva WJ, Del Bel Cury AA. Denture disinfection by microwave energy: influence of Candida albicans biofilm. Gerodontology 2010; 29:e186-91. [DOI: 10.1111/j.1741-2358.2010.00439.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Brondani MA, Samim F, Feng H. A conventional microwave oven for denture cleaning: a critical review. Gerodontology 2010; 29:e6-15. [PMID: 21083741 DOI: 10.1111/j.1741-2358.2010.00442.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Denture cleaning should be quick and easy to perform, especially in long-term care facilities. The lack of proper oral hygiene can put older adults at higher risk from opportunistic oral infections, particularly fungal. As an alternative to regular brushing, the use of a microwave oven has been suggested for cleaning and disinfecting dentures. OBJECTIVES To synthesise and discuss the advantages and disadvantages of the use of a conventional microwave oven for cleaning and disinfecting complete dentures. METHODS A brief literature search focused on papers dealing with microwave therapy for denture cleaning through PubMed Central, Cochrane Database of Systematic Reviews, Google Scholar, Ovid MEDLINE(R) In-Process, and Scifinder Scholar. RESULTS One hundred and sixty-seven manuscripts published in English with full text were found, and 28 were accepted and discussed in the light of the advantages and disadvantages of the use of conventional microwave oven for cleaning and disinfecting complete dentures. CONCLUSIONS There was no standardisation for microwave use for denture cleaning. Manual cleaning still seemed to be the optimal method for controlling fungal infection and denture stomatitis. However, such a daily routine appeared to be underused, particularly in long-term care facilities.
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Lin CX, Zhan HY, Liu MH, Fu SY, Huang LH. Rapid homogeneous preparation of cellulose graft copolymer in BMIMCL under microwave irradiation. J Appl Polym Sci 2010. [DOI: 10.1002/app.32451] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Basso MFM, Giampaolo ET, Vergani CE, Machado AL, Pavarina AC, Ribeiro RC. Influence of Microwave Disinfection on the Dimensional Stability of Denture Reline Polymers. J Prosthodont 2010; 19:364-8. [DOI: 10.1111/j.1532-849x.2010.00583.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Dovigo LN, Pavarina AC, Ribeiro DG, de Oliveira JA, Vergani CE, Machado AL. Microwave Disinfection of Complete Dentures ContaminatedIn Vitrowith Selected Bacteria. J Prosthodont 2009; 18:611-7. [DOI: 10.1111/j.1532-849x.2009.00489.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Ribeiro DG, Pavarina AC, Dovigo LN, Palomari Spolidorio DM, Giampaolo ET, Vergani CE. Denture disinfection by microwave irradiation: a randomized clinical study. J Dent 2009; 37:666-72. [PMID: 19481327 DOI: 10.1016/j.jdent.2009.04.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Revised: 04/16/2009] [Accepted: 04/24/2009] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE This study evaluated the clinical effectiveness of two exposure times of microwave irradiation on the disinfection of complete dentures. METHODS Biofilm samples were collected from dentures of 30 patients, who were randomly divided into two experimental groups of 15 subjects each: Group 1-patients had their maxillary denture microwaved for 3 min (650W); Group 2-patients had their maxillary denture microwaved for 2 min (650W). Denture biofilm samples were taken with swabs, before (left side surfaces) and after (right side surfaces) microwave irradiation. All microbial material was plated on selective media for Candida spp., Staphylococcus spp., mutans streptococci and a non-selective media. After incubation (48 h/37 degrees C), the number of colony-forming units (cfu/mL) was counted. Microorganisms which grew on selective media were identified using biochemical methods. The data were statistically analyzed by Kruskal-Wallis test, followed by Dunn's post-test (alpha=0.05). RESULTS Microwave irradiation for 3 min (Group 1) resulted in sterilization of all dentures evaluated. After microwave irradiation for 2 min (Group 2), a significant decrease in Candida spp. (P=0.0062), Staphylococcus spp. (P=0.0178), mutans streptococci (P=0.0047) and non-identified species (P<0.0001) was achieved in comparison with the cfu/mL obtained before irradiation. The colonies grown after 2 min of microwave irradiation were identified as Candida albicans, non-aureus Staphylococci and Streptococcus mutans. CONCLUSION Microwave irradiation for 3 min may be a potential treatment to prevent cross-contamination.
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Affiliation(s)
- Daniela Garcia Ribeiro
- R. Humaitá n degrees 1680, CEP 14801-903, Department of Dental Materials and Prosthodontics, São Paulo State University, UNESP, Araraquara Dental School, Araraquara, São Paulo, Brazil
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Sanitá PV, Vergani CE, Giampaolo ET, Pavarina AC, Machado AL. Growth ofCandidaspecies on complete dentures: effect of microwave disinfection. Mycoses 2009; 52:154-60. [DOI: 10.1111/j.1439-0507.2008.01558.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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