The elaborated paper presents a series of methodologies with which the dynamic characteristics (damping coefficient, damping factor) can be determined, depending on the working conditions, of a hyperelastic material using vibration theory. These methodologies can be extended to characterize any type of hyperelastic material. The main aim of this work is to develop experimental technology and methodology to characterize this type of materials like rubber to establish a series of dynamic factors like damping factor, transmissibility at resonance, pulsation at resonance, dynamic elastic constant. These characteristics are variable, depending on composition, request, etc. In conclusion, they are not available in specialized literature as are the characteristics of linear-elastic materials. The application of numerical calculation programs in carrying out resistance calculations, in the case of structures made of such materials, is also impossible to achieve, having as an impediment the lack of knowledge of the values of the material characteristics.
{"title":"Experimental Analysis of Hyperelastic Materials Using the Vibration Method","authors":"Miruna Ciolca, Daniel Vlasceanu","doi":"10.37358/mp.24.2.5723","DOIUrl":"https://doi.org/10.37358/mp.24.2.5723","url":null,"abstract":"\u0000The elaborated paper presents a series of methodologies with which the dynamic characteristics (damping coefficient, damping factor) can be determined, depending on the working conditions, of a hyperelastic material using vibration theory. These methodologies can be extended to characterize any type of hyperelastic material. The main aim of this work is to develop experimental technology and methodology to characterize this type of materials like rubber to establish a series of dynamic factors like damping factor, transmissibility at resonance, pulsation at resonance, dynamic elastic constant. These characteristics are variable, depending on composition, request, etc. In conclusion, they are not available in specialized literature as are the characteristics of linear-elastic materials. The application of numerical calculation programs in carrying out resistance calculations, in the case of structures made of such materials, is also impossible to achieve, having as an impediment the lack of knowledge of the values of the material characteristics.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141680325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jilong Tang, Cheng Lin, Chunmei Duan, Lin Nie, Lei Han
This study investigated the mechanical and sensing properties of ethylene-vinyl acetate (EVA)/carbon nanotubes (CNTs) composites in both film and fiber forms. The incorporation of aligned CNTs in the composite fibers possess improved mechanical properties and enhanced sensing performance compared to those of composite films with randomly dispersed CNTs. Thermogravimetric analysis revealed promising thermal stability, indicating potential applications for long-term usage. Cyclic tensile testing demonstrated that the fiber samples with better CNT alignment exhibit higher sensitivity, emphasizing the significance of CNT orientation in constructing an efficient conductive network for strain sensing. Considering the contribution of the CNTs orientation along the measuring direction, a model contains modification parameters was proposed, where a master curve was given, revealing the ideal potential of the EVA/CNTs composite fiber with perfectly aligned CNTs. This work provides valuable insights into the influence of CNT alignment on the mechanical and sensing properties of EVA/CNTs composites. The results underscore the importance of optimizing CNT orientation for enhanced sensing performance in various engineering applications.
{"title":"Impact of Aligned Carbon Nanotubes on the Mechanical Properties and Sensing Performance of EVA/CNTs Composites","authors":"Jilong Tang, Cheng Lin, Chunmei Duan, Lin Nie, Lei Han","doi":"10.37358/mp.24.2.5721","DOIUrl":"https://doi.org/10.37358/mp.24.2.5721","url":null,"abstract":"\u0000This study investigated the mechanical and sensing properties of ethylene-vinyl acetate (EVA)/carbon nanotubes (CNTs) composites in both film and fiber forms. The incorporation of aligned CNTs in the composite fibers possess improved mechanical properties and enhanced sensing performance compared to those of composite films with randomly dispersed CNTs. Thermogravimetric analysis revealed promising thermal stability, indicating potential applications for long-term usage. Cyclic tensile testing demonstrated that the fiber samples with better CNT alignment exhibit higher sensitivity, emphasizing the significance of CNT orientation in constructing an efficient conductive network for strain sensing. Considering the contribution of the CNTs orientation along the measuring direction, a model contains modification parameters was proposed, where a master curve was given, revealing the ideal potential of the EVA/CNTs composite fiber with perfectly aligned CNTs. This work provides valuable insights into the influence of CNT alignment on the mechanical and sensing properties of EVA/CNTs composites. The results underscore the importance of optimizing CNT orientation for enhanced sensing performance in various engineering applications.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141680648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To optimize the infill parameters and improve the tensile properties of 3D printed polyethylene terephthalate-1,4-cyclohexanedimethanol ester (PETG) models, this study explored the effects of infill thickness, infill flow rate, and infill overlap length on the tensile properties of 3D printed PETG models via the one-way test combined with the Taguchi test. The results of the one-way test showed that the tensile strength and elastic modulus of the PETG models increased with the increase of infill thickness, infill flow rate, and infill overlap length. The results of Taguchi s test showed that the influence of infill parameters on the tensile properties of PETG models was as follows: infill thickness ] infill flow rate ] infill overlap length; the optimized infill parameters were: infill thickness of 1.2 mm, infill flow rate of 120%, and infill overlap length of 2.8 mm, and the tensile strength of the 3D printed PETG models with optimized parameters was 20.13 MPa, and elastic modulus was 1.32 GPa, which gave the best tensile properties.
{"title":"Effect of Optimised Infill Parameters on the Tensile Properties of MEX Co-polyester Models","authors":"Chen Wang, Jingyao Li, Tianyi Wang, Xiaowen Wang, Qing Chu","doi":"10.37358/mp.24.2.5724","DOIUrl":"https://doi.org/10.37358/mp.24.2.5724","url":null,"abstract":"\u0000To optimize the infill parameters and improve the tensile properties of 3D printed polyethylene terephthalate-1,4-cyclohexanedimethanol ester (PETG) models, this study explored the effects of infill thickness, infill flow rate, and infill overlap length on the tensile properties of 3D printed PETG models via the one-way test combined with the Taguchi test. The results of the one-way test showed that the tensile strength and elastic modulus of the PETG models increased with the increase of infill thickness, infill flow rate, and infill overlap length. The results of Taguchi s test showed that the influence of infill parameters on the tensile properties of PETG models was as follows: infill thickness ] infill flow rate ] infill overlap length; the optimized infill parameters were: infill thickness of 1.2 mm, infill flow rate of 120%, and infill overlap length of 2.8 mm, and the tensile strength of the 3D printed PETG models with optimized parameters was 20.13 MPa, and elastic modulus was 1.32 GPa, which gave the best tensile properties.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141682997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As an environmentally friendly and renewable energy solution, wind power is rapidly gaining favour worldwide due to its gentle impact on the environment. Nevertheless, the potential environmental risks posed by discarded wind turbine blades still need to be brought to our attention. Therefore, exploring ways to recycle and reuse discarded wind turbine blades has become an urgent task in the field of environmental protection. This study focuses on the incorporation of recycled glass fibres from crushed wind turbine blades into concrete to assess their benefits in engineering practice. In this study, we used four different particle sizes of recycled glass fibres, 0-5mm, 5-10mm, 10-15mm and 15-20mm, and incorporated them into the concrete at four different admixture levels of 0.2%, 0.4%, 0.6% and 0.8%. By comprehensively examining its workability, mechanical properties and microstructure, we found that although the incorporation of glass fibres reduced the apparent density, slump and compressive strength of the concrete to a certain extent, it significantly improved the split tensile and flexural strengths of the concrete, as well as effectively improved the brittleness of the material and enhanced its toughness. These findings reveal the feasibility of recycling glass fibres from decommissioned wind turbine blades and applying them to concrete. This study not only opens up a new path for environmentally friendly recycling and reuse of wind turbine blades, but also provides a valuable reference for practical engineering applications, with significant social and economic benefits.
{"title":"Study of Concrete Properties of Recycled Glass Fibres from Decommissioned Wind Turbine Blades","authors":"Ping He, Qiang Zhang, Chenxi Xu, Hui Deng, Jing Liu, Yanli Liu","doi":"10.37358/mp.24.2.5722","DOIUrl":"https://doi.org/10.37358/mp.24.2.5722","url":null,"abstract":"\u0000As an environmentally friendly and renewable energy solution, wind power is rapidly gaining favour worldwide due to its gentle impact on the environment. Nevertheless, the potential environmental risks posed by discarded wind turbine blades still need to be brought to our attention. Therefore, exploring ways to recycle and reuse discarded wind turbine blades has become an urgent task in the field of environmental protection. This study focuses on the incorporation of recycled glass fibres from crushed wind turbine blades into concrete to assess their benefits in engineering practice. In this study, we used four different particle sizes of recycled glass fibres, 0-5mm, 5-10mm, 10-15mm and 15-20mm, and incorporated them into the concrete at four different admixture levels of 0.2%, 0.4%, 0.6% and 0.8%. By comprehensively examining its workability, mechanical properties and microstructure, we found that although the incorporation of glass fibres reduced the apparent density, slump and compressive strength of the concrete to a certain extent, it significantly improved the split tensile and flexural strengths of the concrete, as well as effectively improved the brittleness of the material and enhanced its toughness. These findings reveal the feasibility of recycling glass fibres from decommissioned wind turbine blades and applying them to concrete. This study not only opens up a new path for environmentally friendly recycling and reuse of wind turbine blades, but also provides a valuable reference for practical engineering applications, with significant social and economic benefits.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141683867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents a study on the stresses and deformations induced by the transversal loading of some flat plates made of E Glass EWR Fiberglass Woven Roving type, having delamination type defects. The parametric analysis of the delamination influence on the stresses and displacements occurring in the plate material is performed. The results of the static calculation are compared with the experimental tests of the flat plates subjected to bending, highlighting the concordance of the variation of the stresses and displacements versus to the position of the delamination position.
本文研究了具有分层缺陷的 E Glass EWR 玻璃纤维编织粗纱平板在横向载荷作用下产生的应力和变形。本文对分层对平板材料应力和位移的影响进行了参数分析。静态计算的结果与平板弯曲试验的结果进行了比较，结果表明应力和位移的变化与分层位置的变化是一致的。
{"title":"The Influence of the Delamination Location on the Bending Behavior of E-Glass Fiber EWR Flat Plates","authors":"E. Beznea, N. Baroiu, I. Chirică","doi":"10.37358/mp.24.2.5718","DOIUrl":"https://doi.org/10.37358/mp.24.2.5718","url":null,"abstract":"\u0000The paper presents a study on the stresses and deformations induced by the transversal loading of some flat plates made of E Glass EWR Fiberglass Woven Roving type, having delamination type defects. The parametric analysis of the delamination influence on the stresses and displacements occurring in the plate material is performed. The results of the static calculation are compared with the experimental tests of the flat plates subjected to bending, highlighting the concordance of the variation of the stresses and displacements versus to the position of the delamination position.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141681504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plastics have light weight and excellent performance, which are widely used in all kinds of automobiles. Polypropylene (PP) and its reinforcing materials are used in automotive components, where the surfaces of bumpers and fenders are coated with paint. Traditional recycling can frequently generate various pollutants, such as paint sludge. Microwave pyrolysis is a more environmentally friendly pyrolysis method with a higher heating coefficient than traditional electric pyrolysis. This study first explores the elemental composition of two types of automotive PP plastics and uses thermo-gravimetric analysis and the Kissinger-Akahira-Sunose method to preliminarily calculate the activation energy of automotive PP. The calculation results show that the activation energy of PP containing paint ranges from 189.145 kJ/mol- 199.513 kJ/mol, with an average value of 193.903 kJ/mol. The activation energy of PP without paint is between 215.506 kJ/mol-265.794 kJ/mol, with an average value of 242.425kJ/mol. Then, pyrolysis experiments on PP for vehicles without paint are conducted using a microwave atmosphere tube furnace at different temperatures and microwave powers. The experimental results showed that, when the pyrolysis temperature increased from 500oC to 620 oC, the total proportion of gas products rose from 0.75 wt.% to 4.81 wt.%, and the content of alkanes in the liquid products improved from 26.21 wt.% to 34.37 wt.%; when the microwave power increased from 900 W to 1100 W, the gas product rose to 20.77 wt.%, and the content of aromatic compounds in the liquid product improved to 17.78 wt.%. In addition, the pyrolysis experiment of automotive PP containing paint showed that paint had a relatively minor effect on the pyrolysis products of automotive PP. This study shows that using microwave pyrolysis to treat automotive PP and PP with paint is feasible, which provides a reference for the clean treatment of automotive polymers.
{"title":"Microwave Pyrolysis of Automotive Polypropylene Based on a Microwave Atmosphere Tube Furnace","authors":"Guanghao Pan, Hongshen Zhang, Tianyi Chen","doi":"10.37358/mp.24.2.5725","DOIUrl":"https://doi.org/10.37358/mp.24.2.5725","url":null,"abstract":"\u0000Plastics have light weight and excellent performance, which are widely used in all kinds of automobiles. Polypropylene (PP) and its reinforcing materials are used in automotive components, where the surfaces of bumpers and fenders are coated with paint. Traditional recycling can frequently generate various pollutants, such as paint sludge. Microwave pyrolysis is a more environmentally friendly pyrolysis method with a higher heating coefficient than traditional electric pyrolysis. This study first explores the elemental composition of two types of automotive PP plastics and uses thermo-gravimetric analysis and the Kissinger-Akahira-Sunose method to preliminarily calculate the activation energy of automotive PP. The calculation results show that the activation energy of PP containing paint ranges from 189.145 kJ/mol- 199.513 kJ/mol, with an average value of 193.903 kJ/mol. The activation energy of PP without paint is between 215.506 kJ/mol-265.794 kJ/mol, with an average value of 242.425kJ/mol. Then, pyrolysis experiments on PP for vehicles without paint are conducted using a microwave atmosphere tube furnace at different temperatures and microwave powers. The experimental results showed that, when the pyrolysis temperature increased from 500oC to 620 oC, the total proportion of gas products rose from 0.75 wt.% to 4.81 wt.%, and the content of alkanes in the liquid products improved from 26.21 wt.% to 34.37 wt.%; when the microwave power increased from 900 W to 1100 W, the gas product rose to 20.77 wt.%, and the content of aromatic compounds in the liquid product improved to 17.78 wt.%. In addition, the pyrolysis experiment of automotive PP containing paint showed that paint had a relatively minor effect on the pyrolysis products of automotive PP. This study shows that using microwave pyrolysis to treat automotive PP and PP with paint is feasible, which provides a reference for the clean treatment of automotive polymers.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141682299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alexandru Pahomi, I. Bradu, D. Neidoni, Gheorghe Ilia
Biphasic calcium phosphate (BCP), containing β-tricalcium phosphate and hydroxyapatite, was synthesized by co-precipitation method to obtain a biomimetic artificial bone-like composite using calcium nitrate tetrahydrate [Ca(NO3)∙4H2O] as calcium precursor and ammonium dihydrogen phosphate (NH4H2PO4) as phosphorous precursor, maintaining Ca/P ratio of 1.67. The synthesized biphasic calcium phosphate mixture was dispersed in a sodium alginate (Alg) matrix dissolved in distilled water and lyophilized. The chemical structure, possible interactions between components and morphology of the obtained powder and scaffolds were studied through Fourier transform infrared (FT- IR) spectroscopy, X-ray diffraction (XRD) thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) in order to observe the interactions between BCP and the polymer. The particle size of the powder was also analyzed using the dynamic light scattering (DLS) analysis. Calcined powder had a particle size of 1.8 �m. In addition to the low crystalline hydroxyapatite (HA), as the main phase in the dried samples, β-tricalcium phosphate (β-TCP) was formed after the thermal treatment of 1000˚C as shown by XRD and FT-IR. The obtained composite material presented a highly porous microstructure with interconnected layers where the BCP particles were well dispersed. The micro-structure of the scaffolds was influenced with the change in pore dimensions and rearrangement of the layers due to the incorporation of the BCP particles and by the treatment of the scaffolds with CaCl2.
{"title":"Influence of Biphasic Calcium Phosphate Incorporation Into Alginate Matrices","authors":"Alexandru Pahomi, I. Bradu, D. Neidoni, Gheorghe Ilia","doi":"10.37358/mp.24.2.5716","DOIUrl":"https://doi.org/10.37358/mp.24.2.5716","url":null,"abstract":"\u0000Biphasic calcium phosphate (BCP), containing β-tricalcium phosphate and hydroxyapatite, was synthesized by co-precipitation method to obtain a biomimetic artificial bone-like composite using calcium nitrate tetrahydrate [Ca(NO3)∙4H2O] as calcium precursor and ammonium dihydrogen phosphate (NH4H2PO4) as phosphorous precursor, maintaining Ca/P ratio of 1.67. The synthesized biphasic calcium phosphate mixture was dispersed in a sodium alginate (Alg) matrix dissolved in distilled water and lyophilized. The chemical structure, possible interactions between components and morphology of the obtained powder and scaffolds were studied through Fourier transform infrared (FT- IR) spectroscopy, X-ray diffraction (XRD) thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) in order to observe the interactions between BCP and the polymer. The particle size of the powder was also analyzed using the dynamic light scattering (DLS) analysis. Calcined powder had a particle size of 1.8 �m. In addition to the low crystalline hydroxyapatite (HA), as the main phase in the dried samples, β-tricalcium phosphate (β-TCP) was formed after the thermal treatment of 1000˚C as shown by XRD and FT-IR. The obtained composite material presented a highly porous microstructure with interconnected layers where the BCP particles were well dispersed. The micro-structure of the scaffolds was influenced with the change in pore dimensions and rearrangement of the layers due to the incorporation of the BCP particles and by the treatment of the scaffolds with CaCl2.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141680922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hand layup was used to fabricate the glass fibre reinforced aluminium foam epoxy composites in this study. On the manufactured materials, dry sliding wear experiments were performed. The effect of wearprocess parameters such asapplying load (kg), speed (m/s), and sliding distance (m) on specific wear rate (Ws) was investigatedand the obtained results were compared with neat glass fibre reinforced epoxy composite in this work. The outcome of these results showed that specific wear rate (Ws) of glassfibre epoxy composite containing aluminium foam decreased as compared with neat glass fibre reinforced polymer composites. Experimental results showed that a minimum wear rate of 10.1 �m was attained for the sliding velocity (1.5 m/s), Applied load (2 kg), and sliding distance (1000 m) in the fabricated composite laminates. It was observed thatthe resistance to wear in glass fibre reinforced aluminium foam composite was mainly due to the bond strength between aluminium foam and epoxy.
{"title":"Study on the Wear Behaviour of Aluminium foam Reinforced Glass Fibre Epoxy Composites","authors":"Madhan Kumar Subramani, Sivakumar Krishnamurthy, Chandradass Jeyaseelan, Paulraj Prabhu","doi":"10.37358/mp.24.2.5717","DOIUrl":"https://doi.org/10.37358/mp.24.2.5717","url":null,"abstract":"\u0000Hand layup was used to fabricate the glass fibre reinforced aluminium foam epoxy composites in this study. On the manufactured materials, dry sliding wear experiments were performed. The effect of wearprocess parameters such asapplying load (kg), speed (m/s), and sliding distance (m) on specific wear rate (Ws) was investigatedand the obtained results were compared with neat glass fibre reinforced epoxy composite in this work. The outcome of these results showed that specific wear rate (Ws) of glassfibre epoxy composite containing aluminium foam decreased as compared with neat glass fibre reinforced polymer composites. Experimental results showed that a minimum wear rate of 10.1 �m was attained for the sliding velocity (1.5 m/s), Applied load (2 kg), and sliding distance (1000 m) in the fabricated composite laminates. It was observed thatthe resistance to wear in glass fibre reinforced aluminium foam composite was mainly due to the bond strength between aluminium foam and epoxy.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141681811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Marcov, M. Burlibasa, N. Marcov, Raluca Mariana Costea, Ioana Voinescu, Mircea Popescu, R. Costea, Dana Bodnar
The purpose of the study was the comparison of the contact tightness of the restored proximal area of lateral teeth with celluloid and metallic matrices and a bulk polymer-based biomaterial using an original in vitro assessing method.In 300 plastic right upper molars, mesial and distal vertical boxes (4 mm width in all directions) were prepared. 150 teeth were restored using circumferential celluloid bands and the rest were restored with sectional metallic saddle bands with the same thickness. The mesial/distal contact tightness was measured, before preparations and after restorations using dental floss and an original system consisting in a dynamometer connected to the model fixed on a plate that could slide gravitationally on vertical metallic rails actioned by a mass of 850 g attached with a string. The passing through force was recorded. For the mesial surfaces, the force varied from 4.782 � 0.014 N (sound) to 5.086 � 0.011 N (restored) (p [ 0.05) for circumferential celluloid matrix while for the sectional metallic matrix, the values varied from 4.787 � 0.016 N (sound) to 5.596 � 0.01 N (restored) (p [ 0.05). For the distal surfaces, the force varied from 5.589 � 0.01 N (sound) to 4.777 � 0.011 N (restored) (p [ 0.05) for circumferential celluloid matrix while, for the sectional metallic matrix, the values varied from 5.586 � 0.012 N (sound) to 5.793 � 0.015 N (restored) (p [ 0.05). Comparing to the sound surfaces, the bulk polymer-based material with high consistency and the circumferential celluloid matrices generated poorer distal and slightly stronger mesial contact area tightness while the sectional metallic ones drove to stronger mesial and distal contacts. However, the celluloid bands are often preferred because they allow the photopolymerization process and permit a good visual control during most of the steps of the working protocol.
{"title":"In vitro Comparison of the Efficiency of Celluloid and Metallic Matrices in Proximal Restorations with a Bulk Polymer-based Biomaterial","authors":"E. Marcov, M. Burlibasa, N. Marcov, Raluca Mariana Costea, Ioana Voinescu, Mircea Popescu, R. Costea, Dana Bodnar","doi":"10.37358/mp.24.2.5715","DOIUrl":"https://doi.org/10.37358/mp.24.2.5715","url":null,"abstract":"\u0000The purpose of the study was the comparison of the contact tightness of the restored proximal area of lateral teeth with celluloid and metallic matrices and a bulk polymer-based biomaterial using an original in vitro assessing method.In 300 plastic right upper molars, mesial and distal vertical boxes (4 mm width in all directions) were prepared. 150 teeth were restored using circumferential celluloid bands and the rest were restored with sectional metallic saddle bands with the same thickness. The mesial/distal contact tightness was measured, before preparations and after restorations using dental floss and an original system consisting in a dynamometer connected to the model fixed on a plate that could slide gravitationally on vertical metallic rails actioned by a mass of 850 g attached with a string. The passing through force was recorded. For the mesial surfaces, the force varied from 4.782 � 0.014 N (sound) to 5.086 � 0.011 N (restored) (p [ 0.05) for circumferential celluloid matrix while for the sectional metallic matrix, the values varied from 4.787 � 0.016 N (sound) to 5.596 � 0.01 N (restored) (p [ 0.05). For the distal surfaces, the force varied from 5.589 � 0.01 N (sound) to 4.777 � 0.011 N (restored) (p [ 0.05) for circumferential celluloid matrix while, for the sectional metallic matrix, the values varied from 5.586 � 0.012 N (sound) to 5.793 � 0.015 N (restored) (p [ 0.05). Comparing to the sound surfaces, the bulk polymer-based material with high consistency and the circumferential celluloid matrices generated poorer distal and slightly stronger mesial contact area tightness while the sectional metallic ones drove to stronger mesial and distal contacts. However, the celluloid bands are often preferred because they allow the photopolymerization process and permit a good visual control during most of the steps of the working protocol.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141681365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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