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Kim SC. Development and performance evaluation of medical radiation-reducing creams using eco-friendly radiation-shielding composites. Sci Rep 2024; 14:20424. [PMID: 39227615 PMCID: PMC11371934 DOI: 10.1038/s41598-024-71031-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2024] [Accepted: 08/23/2024] [Indexed: 09/05/2024] Open
Abstract
To ensure the safety of medical personnel in healthcare organizations, radiation-shielding materials like protective clothing are used to protect against low-dose radiation, such as scattered rays. The extremities, particularly the hands, are the most exposed to radiation. New materials that can be directly coated onto the skin would be more cost-effective, efficient, and convenient than gloves. We developed protective creams using eco-friendly shielding materials, including barium sulfate, bismuth oxide, and ytterbium oxide, to avoid harmful effects of heavy metals like lead, and tested their skin-protective effects. Particularly, the radiation-shielding effect of ytterbium oxide was compared with that of the other materials. As shielding material dispersion and layer thickness greatly affect the efficacy of radiation-shielding creams, we assessed dispersion in terms of the weight percentage (wt%). The effective radiation energy was reduced by 20% with a 1.0-mm increase in cream thickness. Ytterbium oxide had a higher radiation-shielding rate than the other two materials. A 28% difference in protective effect was observed with varying wt%, and the 45 wt% cream at 63.4 keV radiation achieved a 61.3% reduction rate. Higher content led to a more stable incident energy-reducing effect. In conclusion, ytterbium oxide shows potential as a radiation-shielding material for creams.
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Affiliation(s)
- Seon-Chil Kim
- Department of Biomedical Engineering, Keimyung University Department of Medical Informatics, School of Medicine, Keimyung University, Daegu, Korea.
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Pedreira PR, Damasceno JE, de Cerqueira GA, Souza AF, Aguiar FHB, Marchi GM. Radiopacity and physical properties evaluation of infiltrants with Barium and Ytterbium addition. Braz Dent J 2023; 34:93-106. [PMID: 37909646 PMCID: PMC10642274 DOI: 10.1590/0103-6440202305379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 06/23/2023] [Indexed: 11/03/2023] Open
Abstract
Radiopaque properties in the infiltrant should be interesting for clinicians to feel more confident to indicate this treatment. Thus, the aim of this study was to evaluate the effect of the incorporation of barium and ytterbium particles on the physical properties of resin infiltrants. Groups were divided according to the addition of ytterbium oxide (Y) alone (30 or 40%) or Y with barium (YB) (15/15% or 20/20% respectively) in the Icon commercial infiltrant and in the experimental infiltrant base. Digital radiography (n=5), Microradiography (n=5), Microtomography (n=3), degree of conversion (n=5), water sorption (n=16), solubility (n=16), contact angle (n=16), flexural strength (n=16), elastic modulus (n=16) and Energy dispersive X-ray Spectroscopy (n=10) were performed. Analyses were performed using the R program, with a significance level of 5%, and microradiography and Microtomography analyses were evaluated qualitatively. In groups with 30 or 40% of ytterbium, radiopacity was higher or equal to enamel. Microradiography and Microtomography appear to have more radiopacity in groups with 40% (Y). Among the groups with no particle addition, those of the experimental infiltrant presented a higher degree of conversion than those of Icon®. In most groups, there was solubility below the ISO-recommended levels. The addition of particles resulted in higher viscosity. Groups with Icon had higher flexural strength and elastic modulus than groups with experimental infiltrant. The addition of 40% (Y) improved polymerization, had low solubility, and had greater radiopacity than enamel, however negatively affected the viscosity increasing then. Experimental groups with the base showed a higher water sorption than Icon groups.
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Affiliation(s)
- Priscila Regis Pedreira
- Department of Restorative Dentistry, Piracicaba Dental School,
University of Campinas, Piracicaba, São Paulo, 13414-903, Brazil
| | - Janaina Emanuela Damasceno
- Department of Restorative Dentistry, Piracicaba Dental School,
University of Campinas, Piracicaba, São Paulo, 13414-903, Brazil
| | - Gabriela Alves de Cerqueira
- Department of Restorative Dentistry, Piracicaba Dental School,
University of Campinas, Piracicaba, São Paulo, 13414-903, Brazil
| | - Ana Ferreira Souza
- Department of Restorative Dentistry, Piracicaba Dental School,
University of Campinas, Piracicaba, São Paulo, 13414-903, Brazil
| | - Flávio Henrique Baggio Aguiar
- Department of Restorative Dentistry, Piracicaba Dental School,
University of Campinas, Piracicaba, São Paulo, 13414-903, Brazil
| | - Giselle Maria Marchi
- Department of Restorative Dentistry, Piracicaba Dental School,
University of Campinas, Piracicaba, São Paulo, 13414-903, Brazil
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Ataş O, Bılge K, Yıldız S, Dundar S, Calik I, Gezer Ataş A, Bozoglan A. Systemic effect of calcium silicate-based cements with different radiopacifiers-histopathological analysis in rats. PeerJ 2023; 11:e15376. [PMID: 37312877 PMCID: PMC10259441 DOI: 10.7717/peerj.15376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 04/18/2023] [Indexed: 06/15/2023] Open
Abstract
Aim This in vivo study aimed to examine the systemic effects of contemporary calcium silicate cements (CSC) contain different radiopacifiers in rats. Materials & Methods Polyethylene tubes filled with BIOfactor MTA (BIO), Neo MTA Plus (NEO), MTA Repair HP (REP), Biodentine (DENT) and empty tubes (control group) were implanted into the subcutaneous tissues of 80 male Spraque Dawley rats for 7 and 30 days (n = 8). After 7 and 30 day, samples of liver and kidney tissues were submitted to histopathological analysis. Blood samples were collected to evaluate changes in hepatic and renal functions of rats. Wilcoxon and post hoc Dunn Bonferroni tests were used to compare between the 7th and 30th days in order to evaluate the histopathological data. Paired-sample t-test was used to compare laboratory values between the 7th and 30th days, ANOVA analysis and a post hoc Tukey test were used to compare values between groups (p < 0.05). Results On the 7th day, REP, BIO and NEO groups were statistically similar in kidney tissue and the degree of inflammation was found to be significantly higher in these groups compared to the control and DENT groups. On the 30th day, the degree of inflammation of the REP and NEO groups in the kidney tissue was found to be significantly higher than the control, BIO and DENT groups. Although the inflammation in the liver was moderate and mild on the 7th and 30th days, no statistically significant difference was observed between the groups. Vascular congestion was evaluated as mild and moderate in kidney and liver in all groups, and no statistically significant difference was observed between the groups. While there was no statistically significant difference between the groups in the 7th day AST, ALT and urea values, when the creatinine values were compared, the DENT and NEO groups were found to be statistically similar and significantly lower than the control group. On the 30th day, ALT values were statistically similar between the groups. The AST values of the BIO group were found to be significantly higher than the DENT group. While BIO, DENT, NEO and control groups had statistically similar urea values, the REP group was found to be significantly higher than the other groups. The creatinine value of the REP group was significantly higher than the groups other than the control group (p < 0.05). Conclusion CSCs with different radiopacifiers had similar and acceptable effects on the histological examination of the kidneys and liver systemically, and serum ALT, AST, urea, creatinine levels.
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Affiliation(s)
- Osman Ataş
- Faculty of Dentistry, Department of Pediatric Dentistry, Firat (Euphrates) University, Elazig, Turkey
| | - Kubra Bılge
- Faculty of Dentistry, Department of Restorative Dentistry, Firat University, Elazig, Turkey
| | - Semsettin Yıldız
- Faculty of Dentistry, Department of Pediatric Dentistry, Firat (Euphrates) University, Elazig, Turkey
| | - Serkan Dundar
- Faculty of Dentistry, Department of Periodontology, Firat (Euphrates) University, Elazig, Turkey
| | - Ilknur Calik
- Faculty of Medicine, Department of Pathology, Firat (Euphrates) University, Elazig, Turkey
| | | | - Alihan Bozoglan
- Faculty of Dentistry, Department of Periodontology, Firat (Euphrates) University, Elazig, Turkey
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Montazerian M, Gonçalves GVS, Barreto MEV, Lima EPN, Cerqueira GRC, Sousa JA, Malek Khachatourian A, Souza MKS, Silva SML, Fook MVL, Baino F. Radiopaque Crystalline, Non-Crystalline and Nanostructured Bioceramics. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7477. [PMID: 36363085 PMCID: PMC9656675 DOI: 10.3390/ma15217477] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 10/17/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
Radiopacity is sometimes an essential characteristic of biomaterials that can help clinicians perform follow-ups during pre- and post-interventional radiological imaging. Due to their chemical composition and structure, most bioceramics are inherently radiopaque but can still be doped/mixed with radiopacifiers to increase their visualization during or after medical procedures. The radiopacifiers are frequently heavy elements of the periodic table, such as Bi, Zr, Sr, Ba, Ta, Zn, Y, etc., or their relevant compounds that can confer enhanced radiopacity. Radiopaque bioceramics are also intriguing additives for biopolymers and hybrids, which are extensively researched and developed nowadays for various biomedical setups. The present work aims to provide an overview of radiopaque bioceramics, specifically crystalline, non-crystalline (glassy), and nanostructured bioceramics designed for applications in orthopedics, dentistry, and cancer therapy. Furthermore, the modification of the chemical, physical, and biological properties of parent ceramics/biopolymers due to the addition of radiopacifiers is critically discussed. We also point out future research lacunas in this exciting field that bioceramists can explore further.
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Affiliation(s)
- Maziar Montazerian
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Geovanna V. S. Gonçalves
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Maria E. V. Barreto
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Eunice P. N. Lima
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Glauber R. C. Cerqueira
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Julyana A. Sousa
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Adrine Malek Khachatourian
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran 11155-1639, Iran
| | - Mairly K. S. Souza
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Suédina M. L. Silva
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Marcus V. L. Fook
- Northeastern Laboratory for Evaluation and Development of Biomaterials (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
| | - Francesco Baino
- Institute of Materials Physics and Engineering, Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy
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Patil AS, Patil AV, Dighavkar CG, Adole VA, Tupe UJ. Synthesis techniques and applications of rare earth metal oxides semiconductors: A review. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139555] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Non-thermal plasma for surface treatment of inorganic fillers added to resin-based cements. Clin Oral Investig 2021; 26:2983-2991. [PMID: 34791551 DOI: 10.1007/s00784-021-04280-1] [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: 06/01/2021] [Accepted: 11/01/2021] [Indexed: 10/19/2022]
Abstract
OBJECTIVES This study aims to evaluate the effect of non-thermal plasma (NTP) surface treatment in two composite inorganic fillers and evaluate their impact on the chemical-mechanical properties and bond strength ability of experimental resin cements. MATERIALS AND METHODS Ytterbium fluoride (YF) and barium silicate glass (BS) were characterized and submitted to different surface treatments: non-thermal plasma (NTP); non-thermal plasma and 3-(trimethoxysilyl) propyl methacrylate silanization; and 3-(trimethoxysilyl) propyl methacrylate silanization. Untreated fillers were used as a control. The fillers were incorporated at 65wt% concentration into light-cured experimental resin cements (50wt% BisGMA; 25wt% UDMA; 25wt% TEGDMA; 1mol% CQ). The degree of conversion, the flexural strength, and the microshear bond strength (μSBS) were evaluated to characterize developed composites. RESULTS YF and BS were successfully cleaned with NTP treatment. Nor NTP neither the silanization affected the degree of conversion of resin cements. The NTP predicted an increase in YF-containing resin cements flexural strength, reducing the storage impact in these materials. NTP treatment did not affect the μSBS when applied to YF, while silanization was effective for BS-containing materials. CONCLUSION NTP treatment of inorganic particles was possible and was shown to reduce the amount of organic contamination of the particle surface. YF surface treatment with NTP can be an alternative to improve the organic/inorganic interaction in resin composites to obtain materials with better mechanical properties. CLINICAL RELEVANCE Surface cleaning with NTP may be an alternative for particle surface cleaning to enhance organic-inorganic interaction in dental composites resulting in improved mechanical strength of experimental resin cements.
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Rodríguez-Lozano FJ, López-García S, García-Bernal D, Sanz JL, Lozano A, Pecci-Lloret MP, Melo M, López-Ginés C, Forner L. Cytocompatibility and bioactive properties of the new dual-curing resin-modified calcium silicate-based material for vital pulp therapy. Clin Oral Investig 2021; 25:5009-5024. [PMID: 33638052 DOI: 10.1007/s00784-021-03811-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 01/22/2021] [Indexed: 01/03/2023]
Abstract
OBJECTIVE The aim of the present study was to evaluate the in vitro biocompatibility of Theracal PT, Theracal LC, and MTA Angelus, considered as bioactive materials used for vital pulp treatment, on human dental pulp stem cells (hDPSCs). MATERIALS AND METHODS Human dental pulp stem cells (hDPSCs) were isolated from third molars, and material eluates were prepared (undiluted, 1:2, and 1:4 ratios). The hDPSC cytotoxicity, adhesion, morphology, viability, and cell migration were assessed. The mineralization nodule formation was determined by Alizarin red S staining (ARS). The odonto/osteogenic differentiation potential was assessed by osteo/odontogenic marker expression real-time qPCR. The chemical composition and ion release of the vital pulp materials were determined by energy dispersive X-ray (EDX) and inductively coupled plasma-mass spectrometry (ICP-MS), respectively. Statistical differences were assessed by ANOVA and Tukey's test (p < 0.05). RESULTS The three vital pulp materials showed variable levels of calcium, tungsten, silicon, and zirconium release and in their chemical composition. Cytocompatibility assays revealed higher hDPSC viability and migration rates when treated with Theracal PT than with Theracal LC. The lowest cell adhesion and spreading were observed in all Theracal LC-treated groups, whereas the highest were observed when treated with MTA. Theracal PT and MTA promoted the upregulation of DSPP and RUNX2 gene expression (p < 0.05). After 21 days, both MTA Angelus and Theracal PT-treated cells exhibited a significantly higher mineralized nodule formation than the negative control (p < 0.05). CONCLUSIONS This study demonstrates the favorable in vitro cytocompatibility and bioactive properties of the recently introduced Theracal PT and the well-established MTA Angelus on hDPSCs, as opposed to Theracal LC. More studies, including in vivo animal testing are suggested before these new formulations might be used in the clinical setting. CLINICAL RELEVANCE Theracal PT is a new material that could be clinically suitable for vital pulp therapy. Further studies considering its biocompatibility and bioactivity are necessary.
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Affiliation(s)
- Francisco Javier Rodríguez-Lozano
- Cellular Therapy and Hematopoietic Transplant Research Group, Biomedical Research Institute, Virgen de la Arrixaca Clinical University Hospital, IMIB-Arrixaca, University of Murcia, 30120, Murcia, Spain.
- Department of Dermatology, Stomatology, Radiology and Physical Medicine, Morales Meseguer Hospital, Faculty of Medicine, University of Murcia, 30100, Murcia, Spain.
- School of Dentistry, Hospital Morales Meseguer 2 pl., University of Murcia, Av. Marqués de los Vélez, s/n, 30008, Murcia, Spain.
| | - S López-García
- Cellular Therapy and Hematopoietic Transplant Research Group, Biomedical Research Institute, Virgen de la Arrixaca Clinical University Hospital, IMIB-Arrixaca, University of Murcia, 30120, Murcia, Spain
- Department of Dermatology, Stomatology, Radiology and Physical Medicine, Morales Meseguer Hospital, Faculty of Medicine, University of Murcia, 30100, Murcia, Spain
| | - D García-Bernal
- Cellular Therapy and Hematopoietic Transplant Research Group, Biomedical Research Institute, Virgen de la Arrixaca Clinical University Hospital, IMIB-Arrixaca, University of Murcia, 30120, Murcia, Spain
| | - J L Sanz
- Department of Stomatology, Faculty of Medicine and Dentistry, Universitat de València, 46010, Valencia, Spain
| | - A Lozano
- Department of Stomatology, Faculty of Medicine and Dentistry, Universitat de València, 46010, Valencia, Spain
| | - M P Pecci-Lloret
- Department of Dermatology, Stomatology, Radiology and Physical Medicine, Morales Meseguer Hospital, Faculty of Medicine, University of Murcia, 30100, Murcia, Spain
| | - M Melo
- Department of Stomatology, Faculty of Medicine and Dentistry, Universitat de València, 46010, Valencia, Spain
| | - C López-Ginés
- Department of Pathology, Faculty of Medicine and Dentistry, Universitat de València, 46010, Valencia, Spain
| | - L Forner
- Cellular Therapy and Hematopoietic Transplant Research Group, Biomedical Research Institute, Virgen de la Arrixaca Clinical University Hospital, IMIB-Arrixaca, University of Murcia, 30120, Murcia, Spain
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Coaguila-Llerena H, Ochoa-Rodriguez VM, Castro-Núñez GM, Faria G, Guerreiro-Tanomaru JM, Tanomaru-Filho M. Physicochemical Properties of a Bioceramic Repair Material - BioMTA. Braz Dent J 2020; 31:511-515. [PMID: 33146335 DOI: 10.1590/0103-6440202003163] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Accepted: 05/04/2020] [Indexed: 11/22/2022] Open
Abstract
This study aimed to assess the physicochemical properties of a repair material in the Brazilian market, BioMTA, in comparison to other two materials currently in use (Biodentine and MTA Angelus). The initial setting time was evaluated using Gillmore needle. The pH was measured with a pH-meter after 24 h, 3, 7, 14 and 21 days. The radiopacity was determined using the equivalence in millimeters of aluminum (mm Al) from digitized occlusal radiographs. Solubility was determined after immersion in water for 7 days. The data were analyzed by one-way ANOVA and Tukey tests (a=0.05). The BioMTA initial setting time (5.2 min) was lower than the other materials (p<0.05). All materials showed an alkaline pH at 21 days. At 24 h, BioMTA was the most alkaline material (p<0.05); and at 3, 7, 14 and 21 days there was no difference between BioMTA and Biodentine (p>0.05), both being more alkaline than MTA Angelus (p<0.05). The radiopacity of BioMTA (4.2 mm Al) was significantly higher compared to Biodentine (p<0.05) and lower than MTA Angelus (p<0.05). The solubility of the materials was -4.2%, -1.6% and 4.1% for BioMTA, MTA Angelus and Biodentine, respectively, with a significant difference between them (p<0.05). Therefore, it can be concluded that BioMTA displayed a shorter setting time, an alkaline pH, a higher radiopacity, and a gain in mass.
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Affiliation(s)
- Hernán Coaguila-Llerena
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Victor Manuel Ochoa-Rodriguez
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Gabriela Mariana Castro-Núñez
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Gisele Faria
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | | | - Mario Tanomaru-Filho
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
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Iodoform-Blended Portland Cement for Dentistry. PROSTHESIS 2020. [DOI: 10.3390/prosthesis2040025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Portland cement-based formulations blended with radiopacifying agents are popular endodontic materials for various root filling and pulp capping applications. Iodoform (CHI3) is an alternative candidate radiopacifier whose impact on the setting, bioactivity, antimicrobial properties and cytotoxicity of white Portland cement were evaluated in this study. Isothermal conduction calorimetry and 29Si magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) showed that 20 wt% iodoform had no significant impact on the kinetics of cement hydration with respect to the formation of the major calcium silicate hydrate (C-S-H) gel product (throughout the 28-day observation). Conversely, transmission electron microscopy demonstrated that iodine was incorporated into the ettringite (Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O) product phase. Both iodoform-blended and pure Portland cements exhibited comparable biocompatibility with MG63 human osteosarcoma cells and similar bioactivity with respect to the formation of a hydroxyapatite layer upon immersion in simulated body fluid. By virtue of their high alkalinity, both cements inhibited the growth of Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli. However, in all cases, iodoform enhanced the antimicrobial effect and significantly reduced the minimum bactericidal concentration of the cement. In conclusion, iodoform offers antimicrobial advantages in Portland cement-based formulations where oral biofilm formation threatens the success of root filling materials and dentine substitutes. The reactivity with the calcium aluminosulfate components of the hydrating cement matrix warrants further research to understand the long-term stability of the cement matrix in the presence of iodoform.
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10
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Tanomaru-Filho M, Cristine Prado M, Torres FFE, Viapiana R, Pivoto-João MMB, Guerreiro-Tanomaru JM. Physicochemical Properties and Bioactive Potential of a New Epoxy Resin-based Root Canal Sealer. Braz Dent J 2019; 30:563-568. [PMID: 31800750 DOI: 10.1590/0103-6440201802861] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 07/29/2019] [Indexed: 11/21/2022] Open
Abstract
The aim of this study was to evaluate physicochemical properties and bioactive potential of Sealer Plus, in comparison with MTA Fillapex, Sealapex and AH Plus. Setting time, flow, and radiopacity were evaluated based on ISO 6876 Standard. Flow was also assessed in area (mm²). The solubility and volumetric change of the sealers were evaluated after 7 and 30 days of immersion in distilled water. Solubility was evaluated by the difference in mass of materials before and after immersion. Volumetric change was evaluated by using microcomputed tomography (micro-CT). The bioactive potential was observed by Scanning Electron Microscopy (SEM) after immersion in PBS. Data were compared using ANOVA and Tukey tests (α=0.05). Sealer Plus presented the shortest setting time (196 min.) and Sealapex the longest (912 min.) (p<0.05). AH Plus showed the highest radiopacity (9.5 mm Al) and MTA Fillapex the lowest (2.7 mm Al) (p<0.05). All the sealers presented flow in accordance with ISO 6876/2012 (>17 mm). Sealer Plus showed low solubility and volumetric change (<1%), and MTA Fillapex showed the highest solubility (>25%), and volumetric change (>4%) after all time intervals (p<0.05). MTA Fillapex was the only sealer that showed bioactive potential. In conclusion, Sealer Plus presented proper physicochemical properties. However, this sealer did not present a bioactive potential.
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Affiliation(s)
- Mario Tanomaru-Filho
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Maiby Cristine Prado
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | | | - Raqueli Viapiana
- Department of Restorative Dentistry, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
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Li Q, Coleman NJ. Impact of Bi 2O 3 and ZrO 2 Radiopacifiers on the Early Hydration and C-S-H Gel Structure of White Portland Cement. J Funct Biomater 2019; 10:jfb10040046. [PMID: 31635346 PMCID: PMC6963627 DOI: 10.3390/jfb10040046] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/11/2019] [Accepted: 10/14/2019] [Indexed: 11/20/2022] Open
Abstract
Bismuth oxide (monoclinic α-Bi2O3) and zirconium oxide (monoclinic ZrO2) are the most popular radiopacifiers in commercial Portland cement-based endodontic restoratives, yet their effects on the setting and hydration reactions are not fully understood. This study compares the impact of 20 wt.% of Bi2O3 or ZrO2 on the early hydration reactions and C–S–H gel structure of white Portland cement (WPC). Cement paste samples were hydrated at 37.5 °C prior to analysis by 29Si and 27Al magic angle spinning nuclear magnetic resonance spectroscopy at 3 h and 24 h, and transmission electron microscopy at 3 h. Initial and final setting times were determined using a Vicat apparatus and reaction kinetics were monitored by isothermal conduction calorimetry. Bi2O3 was found to prolong initial and final setting times and retard the degree of hydration by 32% at 24 h. Heat evolution during the acceleration and deceleration phases of the hydration process was reduced and the exotherm arising from renewed ettringite formation was delayed and diminished in the presence of Bi2O3. Conversely, ZrO2 had no significant impact on either setting time; although, it accelerated hydration by 23% within 24 h. Increases in the mean silicate chain length and the extent of aluminum substitution in the C–S–H gel were observed in the presence of both radiopacifying agents after 24 h relative to those of the unblended WPC. The Bi2O3 and ZrO2 particles remained intact within the cement matrix and neither bismuth nor zirconium was chemically incorporated in the hydration products.
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Affiliation(s)
- Qiu Li
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
| | - Nichola J Coleman
- Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Kent ME4 4TB, UK.
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