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Iwasaki T, Kamiya N, Hirayama S, Tanimoto Y. Evaluation of the mechanical behavior of bulk-fill and conventional flowable resin composites using dynamic micro-indentation. Dent Mater J 2021; 41:87-94. [PMID: 34471041 DOI: 10.4012/dmj.2021-116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this research was to investigate the mechanical behavior of commercially available bulk-fill and conventional flowable resin composites using the dynamic micro-indentation method. The effect of inorganic filler content on mechanical properties was also assessed. Weight percentages of the inorganic filler in the resin composite were measured using the ashing technique. The results showed that dynamic hardness and elastic modulus tended to increase with inorganic filler content. Furthermore, the differences in mechanical properties between top and bottom surfaces were less pronounced in bulk-fill flowable resin composites compared with conventional flowable resin composites. In conclusion, the mechanical properties of bulk-fill flowable resin composites are affected by filler content. Moreover, bulk-fill flowable resin composites have a higher polymerization depth than conventional flowable resin composites when sample thickness is 4 mm.
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Affiliation(s)
- Taro Iwasaki
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo
| | - Naotaka Kamiya
- Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
| | - Satoshi Hirayama
- Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
| | - Yasuhiro Tanimoto
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo
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Chalony C, Aguilar LE, Kim JY, Park CH, Kim CS. Development of electrospun core-shell polymeric mat using poly (ethyl-2) cyanoacrylate/polyurethane to attenuate biological adhesion on polymeric mesh implants. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 122:111930. [PMID: 33641922 DOI: 10.1016/j.msec.2021.111930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 12/28/2020] [Accepted: 01/28/2021] [Indexed: 11/27/2022]
Abstract
Poly (ethyl-2) cyanoacrylate was used to create an adhesion-free biocompatible non-woven material reinforced by polyurethane core via a co-axial electrospinning set-up. The effect of relative humidity (RH) of (18, 30, 40, 60, and 68) % on the electrospinning process was examined, and found that in order to achieve well defined core-shell fiber structure, the optimal RH was 18%. If the RH is >18%, a phenomenon called Taylor cone cyclic destabilization occurs, which results in unfavorable surface and mechanical properties of the mat. The developed composite electrospun mat has the potential to be used in medical devices, such as repairing the viscera layer for intraperitoneal hernia mesh implants, which require the attenuation of biological elements, and adequate mechanical properties.
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Affiliation(s)
- Carmen Chalony
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Republic of Korea
| | - Ludwig Erik Aguilar
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Republic of Korea
| | - Ju Yeon Kim
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Republic of Korea
| | - Chan Hee Park
- Department of Bionanotechnology and Bioconvergence Engineering, Graduate School, Jeonbuk National University, Republic of Korea; Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju City, 54001, Republic of Korea.
| | - Cheol Sang Kim
- Department of Bionanotechnology and Bioconvergence Engineering, Graduate School, Jeonbuk National University, Republic of Korea; Division of Mechanical Design Engineering, Jeonbuk National University, Jeonju City, 54001, Republic of Korea.
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Yilmaz E, Sadeler R. Effect of different thermal change tests of micro tensile strength behavior bio-composite materials; In vitro study. BIOMEDICAL RESEARCH JOURNAL 2021. [DOI: 10.4103/bmrj.bmrj_6_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Physical and mechanical characterisation of flowable dental composites reinforced with short aspect ratio micro-sized S-Glass fibres. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 111:110771. [PMID: 32279786 DOI: 10.1016/j.msec.2020.110771] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 01/08/2020] [Accepted: 02/22/2020] [Indexed: 11/24/2022]
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Khosravani MR. Mechanical behavior of restorative dental composites under various loading conditions. J Mech Behav Biomed Mater 2019; 93:151-157. [PMID: 30798181 DOI: 10.1016/j.jmbbm.2019.02.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 02/07/2019] [Accepted: 02/11/2019] [Indexed: 12/12/2022]
Abstract
Mechanical engineering and its scientific principles constitute an essential core in medical science. Currently, different composite resins are widely used as restorative dental materials. However, their lack of adequate strength and toughness has led to research that is aimed at improving the mechanical properties of dental composites. In the present study, the behavior of three different dental materials is investigated under static and dynamic loading conditions. In the experimental tests, a split Hopkinson pressure bar is utilized which corresponds to the most commonly used experimental setup for examining material behavior under a high rate of loading. The examined dental composites experience impacts during their service life and also during car accidents or sport injuries. Hence, in the study, impact loading is modeled in an experiment. A series of compression tests is conducted from low to high strain rates up to 40s-1, and the dynamic elastic moduli of three different dental composites are measured. Furthermore, studies on the compressed surface of the dental composite specimens are performed to improve the analysis with respect to the hardness of the materials. The responses of the examined composites to dynamic loadings verify the impact resistance of the materials. The results indicate the load-carrying capabilities of the dental composites. These results can be used for materials development and existing computational models.
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Faridirad F, Barmar M, Ahmadi S. The effect of MWCNT on dynamic mechanical properties and crystallinity of in situ polymerized polyamide 12 nanocomposite. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4322] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Farzaneh Faridirad
- Iran Polymer and Petrochemical Institution; Pazhouhesh Blvd., Pazhouhesh Science Park, Km 15, Tehran-Karaj Highway Tehran Iran 1497713115
| | - Mohammad Barmar
- Iran Polymer and Petrochemical Institution; Pazhouhesh Blvd., Pazhouhesh Science Park, Km 15, Tehran-Karaj Highway Tehran Iran 1497713115
| | - Shervin Ahmadi
- Iran Polymer and Petrochemical Institution; Pazhouhesh Blvd., Pazhouhesh Science Park, Km 15, Tehran-Karaj Highway Tehran Iran 1497713115
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Gouveia THN, Theobaldo JD, Vieira-Junior WF, Lima DANL, Aguiar FHB. Esthetic smile rehabilitation of anterior teeth by treatment with biomimetic restorative materials: a case report. Clin Cosmet Investig Dent 2017; 9:27-31. [PMID: 28652816 PMCID: PMC5477167 DOI: 10.2147/ccide.s130698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND In daily clinical practice, esthetics of anterior teeth is a common presenting complaint of patients. OBJECTIVE This case report discusses the management of asymmetric smile associated with unsatisfactory extensive composite restorations and describes a clinical protocol using the direct composite resin for smile enhancement to restore the dental harmony of anterior teeth. METHODS The treatment planning was based on a diagnostic wax-up and cosmetic mock-up. After clinical and patient approvals were obtained, the patient was subjected to direct and indirect restorative treatment. CONCLUSION Nanocomposites are an effective alternative for anterior teeth restorations. Additionally, good planning enables satisfactory esthetic results, leading to the correction of an inappropriate axial inclination of incisors.
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Affiliation(s)
| | - Jéssica Dias Theobaldo
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Campinas, SP, Brazil
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Physical characterization of unfilled and nanofilled dental resins: Static versus dynamic mechanical properties. Dent Mater 2016; 32:e185-97. [DOI: 10.1016/j.dental.2016.06.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Revised: 03/04/2016] [Accepted: 06/03/2016] [Indexed: 11/20/2022]
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Mohammed AA, Haris SM, Nuawi MZ. Using the pressure transmission coefficient of a transmitted wave to evaluate some of the mechanical properties of refractory metals. ULTRASONICS 2015; 55:133-140. [PMID: 25096851 DOI: 10.1016/j.ultras.2014.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 06/30/2014] [Accepted: 07/01/2014] [Indexed: 06/03/2023]
Abstract
Refractory metals have attracted increasing interest in recent years because of their use in many high-temperature applications. However, the characteristics of these metals calculated using loaded tests (such as tensile strength tests) differ considerably from those calculated using one of the most famous methods in NDT which is called time of flying of the wave (TOF).The present study presents two solutions based on calculating the pressure transmission coefficient (PTC) of the transmitted wave between the test sample and magnesium metal. The first is based on the development of a highly accurate algorithm that lowers the cost by determining the acoustic impedance of the test specimen to calculating mechanical properties. Up to 26 theoretical tests were done (10 of these tests for refractory materials) according to their known mechanical properties to verify the accuracy of the algorithm. The convergence in results ranged from 92% to 99%. The second solution was designed to solve the same problem for specimens with a thickness of less than 1mm. Eight experimental tests were done (five using refractory materials) to verify the accuracy of the second solution, with the convergence in the results ranging from 94% to 97%. The relationships of the Vrms measured from the oscilloscope with the PTC and with the Fourier transform spectrum were derived. The results of this research were closer to the standard mechanical properties for refractory metals compared with several recent acoustic tests.
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Affiliation(s)
- Arshed Abdulhamed Mohammed
- Electronic Department, College of Engineering, Diyala University, Iraq; Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, UKM, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia.
| | - Sallehuddin Mohamed Haris
- Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, UKM, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
| | - Mohd Zaki Nuawi
- Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, UKM, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
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Hirayama S, Iwai H, Tanimoto Y. Mechanical evaluation of five flowable resin composites by the dynamic micro-indentation method. JOURNAL OF DENTAL BIOMECHANICS 2014; 5:1758736014533983. [PMID: 25342983 PMCID: PMC4206663 DOI: 10.1177/1758736014533983] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 04/05/2014] [Indexed: 11/30/2022]
Abstract
Measurement of the strength of brittle materials, such as resin composites, is extremely difficult. Micro-indentation hardness testing is a convenient way of investigating the mechanical properties of a small volume of material. In this study, the mechanical properties of five commercially available flowable resin composites were investigated by the dynamic micro-indentation method. Additionally, the effects of inorganic-filler content on the dynamic hardness and elastic modulus of flowable composites obtained by this method were investigated. The weight percentages of the inorganic fillers in the resin composites were determined by the ashing technique. The results indicate that the mechanical properties of flowable composites are affected by not only the filler content but also the properties of the resin matrix. In conclusion, the dynamic micro-indentation method is a useful technique for determining the mechanical behavior of dental resin composites as brittle material.
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Affiliation(s)
- Satoshi Hirayama
- Department of Operative Dentistry, School of Dentistry at Matsudo, Nihon University, Matsudo, Japan
| | - Hirotoshi Iwai
- Department of Operative Dentistry, School of Dentistry at Matsudo, Nihon University, Matsudo, Japan
| | - Yasuhiro Tanimoto
- Department of Dental Biomaterials, School of Dentistry at Matsudo, Nihon University, Matsudo, Japan
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Dynamic and static mechanical analysis of resin luting cements. J Mech Behav Biomed Mater 2012; 6:1-8. [DOI: 10.1016/j.jmbbm.2011.10.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 10/05/2011] [Accepted: 10/06/2011] [Indexed: 11/21/2022]
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