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1
Ardana, Emy, and Aries Chandra Trilaksana. "Pasak estetik dari bahan fiber reinforced composite Esthetic post made of fiber reinforced composite materials." Journal of Dentomaxillofacial Science 12, no. 1 (February 28, 2013): 54. http://dx.doi.org/10.15562/jdmfs.v12i1.350.
Анотація:
The prosthetic treatment of seriously damaged teeth after treated with endodontic often require an endodontic post asan additional retention element for core build-up prior to crown restoration. In addition to metal-based posts andzirconia-based ceramic posts, fiber reinforced composite (FRC) post system has become to be widely used in therestoration of endodontically treated teeth. A FRC post offers a number of advantages over a metal post due to itsmodulus of elasticity being closer to that of dentin and superior esthetic quality. Teeth restored with FRC posts showbetter resistance to fracture propagation than teeth restored with prefabricated or cast metal posts. Endodonticallytreated teeth reinforced with a prefabricated fiber post have shown lower incidences of root fracture.
2
Alshahrani, Ibrahim, Moshabab A. Asiry, Mohamad K. Altwijry, Sangeetha N. Premanath, Ravikumar Ramakrishnaiah, and Bangalore H. Durgesh. "Nanomechanical properties, surface topography, and color stability of fiber-reinforced composite orthodontic retainers." Polymers and Polymer Composites 27, no. 2 (January 6, 2019): 92–100. http://dx.doi.org/10.1177/0967391118819703.
Анотація:
The present study investigated the nanomechanical properties, surface topography, and color alterations of fiber-reinforced composite (FRC) orthodontic retainers. Two FRC orthodontic retainer materials (glass fiber reinforced (group 1) and polyethylene fiber reinforced (group 2)) were evaluated. Nanomechanical properties (nano-hardness and elastic modulus), surface roughness (Ra), and color stability of FRC retainers at baseline and after 2 years of simulated aging were evaluated. The data collected were analyzed using analyses of variance, followed by Tukey’s honestly significant difference test for post hoc comparisons at the significance level of p < 0.05. Group 1 specimens exhibited highest hardness (0.16 ± 0.06) and elastic modulus (2.68 ± 0.17) at baseline, and group 2 specimens showed lowest hardness (0.09 ± 0.16) and elastic modulus (2.19 ± 0.36) after aging. Significant difference in hardness and elastic modulus was observed between the groups at baseline and after aging ( p < 0.05).The aged specimens demonstrated decreased hardness and elastic modulus values compared to baseline specimens, but the differences were not significant ( p > 0.05). Group 2 specimens exhibited increased Ra at baseline (0.46 ± 0.79) and aging (0.84 ± 0.94), and the least Ra values were observed with group 1 specimens at baseline (0.31 ± 0.87) and aging (0.59 ± 0.65). There was a significant color alteration of the specimens from baseline to aging in both the groups ( p < 0.05). However, group 1 specimens showed noticeable color change, and group 2 showed appreciable color change. Glass fiber-reinforced FRC orthodontic retainer exhibited superior properties compared to polyethylene fiber-reinforced FRC. Accelerated aging decreases surface hardness of the polymer matrix and increases Ra and discoloration of the FRC retainer materials.
3
Kim, B., A. J. Boyd, and J. Y. Lee. "Durability performance of fiber-reinforced concrete in severe environments." Journal of Composite Materials 45, no. 23 (April 26, 2011): 2379–89. http://dx.doi.org/10.1177/0021998311401089.
Анотація:
Polypropylene (PP; 0.5%), polyvinyl alcohol (PVA; 0.75%), and hooked-end steel (1%) fibers were investigated to evaluate the durability performance of fiber-reinforced concrete (FRC) exposed to severe environments. Conventional beam specimens (100 × 100 × 360 mm3) were prepared and exposed to three types of conditioning systems for 27 months, in both un-cracked and pre-cracked conditions. Degradation of the FRC was evaluated using visual or photographic inspection, change in permeable pore space, destructive beam testing, scanning electron microscopy analysis, and depth of carbonation measurements. For each of the fiber types and mixtures evaluated, significant surface degradation and carbonation only appeared in specimens exposed to immersion in a low pH solution designed to simulate swamp water. These specimens also exhibited significant degradation in both average residual strength (ARS) and toughness. On the other hand, difficulties in the comparison between pre-cracked specimens and un-cracked specimens were found due to re-adhered or healed pre-cracked specimens from dissolved materials (salt or lime) in solutions. A relatively good resistance to saltwater immersion and w/d conditioning was observed for all fiber types. Among fiber types, steel fibers showed the highest strength to conditioning compared with PP and PVA fibers.
4
Lee, Seong-Cheol, Kyung-Joon Shin, and Byung-Hwan Oh. "Cyclic pull-out test of single PVA fibers in cementitious matrix." Journal of Composite Materials 45, no. 26 (September 9, 2011): 2765–72. http://dx.doi.org/10.1177/0021998311417476.
Анотація:
Recently, many studies have been conducted to examine the behavior of fiber-reinforced concrete (FRC) subjected to cyclic loading. However, cyclic and fatigue behavior is so complex that the mechanism of degradation cannot be cleared just by simple mechanical tests such as flexural and tensile tests of FRC specimens that measure typical overall behavior of the material. Besides these kinds of investigations, the individual behavior of the constituents and the interaction between them need to be investigated to reveal the cyclic degradation and fatigue mechanism of FRC detail. So far, only a few experiments have been devoted to the cyclic degradation of fibers in FRC. Therefore, cyclic pull-out behavior of single fiber is investigated in this study. A main objective of this article is to propose a test method for a cyclic pull-out test of a single fiber and to investigate the degradation behavior of single PVA fibers under cyclic loading conditions. Single PVA fibers were tested using quasi-static and cyclic loading methods, and the test results revealed the bridging load of PVA fibers decreases continuously and it become less than half the initial load during the cyclic loading process.
5
Kumbuloğlua, Ovul, Niler Özdemira, Gökhan Aksoy, and Atilla User. "A Different Pontic Design for Fiber-Reinforced Composite Bridgeworks: A Clinical Report." European Journal of Dentistry 01, no. 01 (January 2007): 050–53. http://dx.doi.org/10.1055/s-0039-1698312.
Анотація:
ABSTRACTThis clinical report describes a relatively simple but esthetic, non-invasive and functional prosthodontic treatment option for a patient with missing tooth..Methods: Methods: A patient with a missing maxillary left canine was non-invasively treated with a fiber reinforced composite (FRC) bridgework with an all ceramic (Empress II, Ivoclar Vivadent, Schaan, Liechtenstein) pontic design, using laboratory technique.Results: The restoration has served the patient for 2 year, seemingly without discomfort, and it has not required any maintenance. The patient has kept up with his oral hygiene. Conclusions: Although additional clinical experience is necessary, fiber-reinforced composite materials can be used in combination with a lithium disilicate ceramic material in fixed partial dentures. (Eur J Dent 2007,1:50-53)
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Rocca, GT, N. Rizcalla, and I. Krejci. "Fiber-reinforced Resin Coating for Endocrown Preparations: A Technical Report." Operative Dentistry 38, no. 3 (April 1, 2013): 242–48. http://dx.doi.org/10.2341/12-139-tr.
Анотація:
SUMMARY Coronal rehabilitation of endodontically treated posterior teeth is still a controversial issue. Although the use of classical crowns supported by radicular metal posts remains widespread in dentistry, their invasiveness has been largely criticized. New materials and therapeutic options based entirely on adhesion are available nowadays, from direct composite resins to indirect endocrowns. They allow for a more conservative, faster, and less expensive dental treatment. However, the absence of a metal or high-strength ceramic substructure as in full-crown restorations can expose this kind of restoration to a higher risk of irreversible fracture in case of crack propagation. The aim of this case report is to present a technique to reinforce the cavity of an endodontically treated tooth by incorporating a fiber-reinforced composite (FRC) layer into the resin coating of the tooth preparation, before the final impressions of the cavity. This technique allows the use of FRCs in combination with any kind of restorative material for an adhesive overlay/endocrown.
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Naumann, M., A. Preuss, and R. Frankenberger. "Load Capability of Excessively Flared Teeth Restored with Fiber-reinforced Composite Posts and All-ceramic Crowns." Operative Dentistry 31, no. 6 (November 1, 2006): 699–704. http://dx.doi.org/10.2341/05-142.
Анотація:
Clinical Relevance The fracture resistance of excessively flared endodontically-treated teeth (ETT) without ferrule preparation is not acceptable. Adhesively luted FRC posts with 2 mm ferrule are recommended.
8
Hassan, Tareq, and AM Aurangjeb. "Comparison of fiber-reinforced composite crowns and metal ceramic crowns according to attrition of opposing teeth." Update Dental College Journal 4, no. 1 (December 7, 2014): 21–26. http://dx.doi.org/10.3329/updcj.v4i1.21161.
Анотація:
Back ground: Fiber reinforcement was introduced to clinical dentistry for the first time in the 1960s when investigators attempted to reinforce polymethyl- methacrylate dentures with glass or carbon fibers. It has recently been shown that crowns, bridges and posts made of FRC can be used successfully in dental practice and they are esthetically more acceptable than conventional metal ceramic crown. Aims: A prospective comparative cross-sectional study was performed involving 60 patients who attended in the out patients department of Prosthodontics, Faculty of Dentistry, BSMMU during the period of January 2007 to December 2008. Objective: Compare fiber-reinforced composite crowns and metal ceramic crowns according to attrition of opposing teeth. Methods: Clinical data were recorded from the randomly selected 60 patients divided in to tow groups experimental and control. Attrition of opposing teeth was indexed after California Dental Associations quality evaluation system. Results: In group A patients, 12(40.0%) were male and 18(60.0%) female. In group B patients 14(46.7%) were male and 16(53.3%) were female. All the patients were in grade I in both groups after 4 months. After 8 months all patients were in grade I in group A and 29(96.7%) patients were in grade I in group B. After 12 months all patients were in grade I in group A and 28(93.3%) patients were in grade I in group B. The difference was not statistically significant (p>0.05) in chi square test. Conclusion: The Fiber Reinforced Composite crown represents a valuable development in field of Prosthetic Dentistry. DOI: http://dx.doi.org/10.3329/updcj.v4i1.21161 Update Dent. Coll. j: 2014; 4 (1): 21-26
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Magne, P., J. Goldberg, D. Edelhoff, and J.-F. Güth. "Composite Resin Core Buildups With and Without Post for the Restoration of Endodontically Treated Molars Without Ferrule." Operative Dentistry 41, no. 1 (January 1, 2016): 64–75. http://dx.doi.org/10.2341/14-258-l.
Анотація:
SUMMARY Objective The aim of this study was to investigate the restoration of highly damaged, broken-down endodontically treated molars without the ferrule effect using glass ceramic crowns on different dual-cure composite resin core buildups. Methods and Materials Thirty (N=30, n=15) decoronated, endodontically treated teeth (no ferrule) were restored without a ferrule with a direct buildup using the dual-curing composite Multicore HB (group MHB) or the dual-curing composite core buildup Multicore Flow in combination with glass-fiber–reinforced composite post (FRC post; group MFP). All teeth were prepared to receive bonded glass ceramic crowns (Empress CAD luted with Variolink II) and were subjected to accelerated fatigue testing. Cyclic isometric loading was applied to the palatal cusp at an angle of 30 degrees and a frequency of 5 Hz, beginning with a load of 200 N (×5000 cycles), followed by stages of 400, 600, 800, 1000, 1200, and 1400 N at a maximum of 30,000 cycles each. Specimens were loaded until failure or to a maximum of 185,000 cycles. Groups were compared using the life table survival analysis (log rank test at p=0.05). Average fracture loads and number of survived cycles were compared with one-way analysis of variance (Scheffé post hoc at p=0.05). Previously published data from the same authors about core buildups made of high-performance polymers (group HPP, n=15) and light-curing composite resin without FRC posts (group TEC, n=15) and with FRC posts (group TECP, n=15) using the same experimental setup were included for comparison. Results None of the tested specimen withstood all 185,000 load cycles. There was no significant difference in mean fracture load (p=0.376), survived cycles (p=0.422), and survival (p=0.613) between MHB (facture load 859.4 N±194.92) and MFP (796.13 N±156.34). Group HPP from a previous study appeared to have significantly higher performance than all other groups except MHB. All groups with posts were affected by an initial failure phenomenon (wide gap at the margin between the buildup/crown assembly and the root). Conclusions HPP and MHB enhanced the performance of all-ceramic leucite-reinforced glass ceramic crowns, and insertion of a fiber-reinforced composite post was not influential when using other materials.
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Özcan, Mutlu, Julia Höhn, Dayanne Duarte Moura, and Rodrigo Souza. "Influence of testing parameters on the load-bearing capacity of prosthetic materials used for fixed dental prosthesis: A systematic review and meta-analysis." Brazilian Dental Science 21, no. 4 (October 24, 2018): 470. http://dx.doi.org/10.14295/bds.2018.v21i4.1652.
Анотація:
<p>The aim of this study was to systematically review the literature to assess static fracture strength tests applied for FDPs and analyze the impact of periodontal ligament (PDL) simulation on the fracture strength. Original scientific papers published in MEDLINE (PubMed) database between 01/01/1981 and 01/06/2010 were included in this systematic review. Data were analyzed considering the test method (static loading), material type (metal-ceramic-MC, oxide all-ceramic-AC, fiber reinforced composite resin-FRC, composite resin-C), PDL (without or with) and restoration type (single crowns, 3-unit, 4-unit, inlay-retained and cantilever FDPs). The selection process resulted in the 72 studies. In total, 377 subgroups revealed results from static load-bearing capacity of different materials. Fourteen metal-ceramic, 190 AC, 121 FRC, 45 C resin groups were identified as subgroups. Slightly decreased results were observed with the presence of PDL for single crowns (without PDL=1117±215 N; with PDL=876±69 N), 3-unit FDPs (without PDL=791±116 N; with PDL=675±91 N) made of AC, 3-unit FDP (without PDL=1244±270 N; with PDL=930±76 N) and inlay-retained FDP (without PDL=848±104 N; with PDL=820±91 N) made of FRC and 4-unit FDPs (without PDL=548±26 N; with PDL=393±67 N) made of C. Overall, for single crowns, fracture strength of FRC was higher than that of AC and MC; for 3-unit FDPs FRC=C>AC=MC; for 4-unit FDPs AC>FRC>C and for inlay-retained FDPs, FRC=AC. An inclination for decreased static fracture strength could be observed with the simulation of PDL but due to insufficient data this could not be generalized for all materials used for FDPs.</p>
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Lassila, Lippo V. J., Sufyan Garoushi, Johanna Tanner, Pekka K. Vallittu, and Eva Söderling. "Adherence of Streptococcus mutans to Fiber-Reinforced Filling Composite and Conventional Restorative Materials." Open Dentistry Journal 3, no. 1 (December 4, 2009): 227–32. http://dx.doi.org/10.2174/1874210600903010227.
Анотація:
Objectives. The aim was to investigate the adhesion of Streptococcus mutans (S. mutans) to a short glass fibers reinforced semi-IPN polymer matrix composite resin. The effect of surface roughness on adhesion was also studied. For comparison, different commercial restorative materials were also evaluated. Materials and Methods. Experimental composite FC resin was prepared by mixing 22.5 wt% of short E-glass fibers, 22.5 wt% of IPN-resin and 55 wt% of silane treated silica fillers using high speed mixing machine. Three direct composite resins (Z250, Grandio and Nulite), resin-modified glass ionomers (Fuji II LC), amalgam (ANA 2000), fiber-reinforced composite (FRC) (everStick and Ribbond), and pre-fabricated ceramic filling insert (Cerana class 1) were tested in this study. Enamel and dentin were used as controls. The specimens (n=3/group) with or without saliva were incubated in a suspension of S. mutans allowing initial adhesion to occur. For the enumeration of cells on the disc surfaces as colony forming units (CFU) the vials with the microbe samples were thoroughly Vortex-treated and after serial dilutions grown anaerobically for 2 days at +37°C on Mitis salivarius agars (Difco) containing bacitracin. Bacterial adhesion was also evaluated by using scanning electron microscopy. Surface roughness (Ra) of the materials was also determined using a surface profilometer. All results were statistically analyzed with one-way analysis of variance (ANOVA). Results. Composite FC resin and other commercial restorative materials showed similar adhesion of S. mutans, while adhesion to dentin and enamel was significantly higher (p<0.05). Surface roughness had no effect on bacterial adhesion. Saliva coating significantly decreased the adhesion for all materials (p<0.05). Composite FC resin had a significantly higher Ra value than control groups (p<0.05). Conclusions. Short fiber-reinforced composite with semi-IPN polymer matrix revealed similar S. mutans adhesion than commercial restorative materials.
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Hassan, Tareq, Sohana Ferdous, and Aslam Md Aurangjeb. "Comparison of marginal adaptation of fiber reinforced composite and metal ceramic full veneer crown." Bangladesh Journal of Dental Research & Education 5, no. 1 (March 5, 2015): 1–5. http://dx.doi.org/10.3329/bjdre.v5i1.22450.
Анотація:
Fiber reinforcement was introduced to clinical dentistry for the first time in the 1960s when investigators attempted to reinforce polymethyl-methacrylate dentures with glass or carbon fibers. It has recently been shown that crowns, bridges and posts made of FRC can be used successfully in dental practice and on the basis of marginal adaptation they are more acceptable than conventional metal ceramic crown. A prospective comparative cross-sectional study was performed involving 60 patients who attended in the out patients department of Prosthodontics, Faculty of Dentistry, BSMMU during the period of January 2007 to December 2008. Clinical data were recorded for the selected 60 patients who were divided into two groups experimental and control. Marginal adaptation was indexed after California Dental Associations quality evaluation system. The age of the patients ranged from 18 to 42 years in group A and 17 to 38 years in group B. The highest number of patients was in the age group 21-30 years in both the groups. The mean age was 24.9±5.8 years and 25.0±4.8 years in group A and group B respectively. There were 26 male and 34 female patients in the study and male female ratio was 1:1.3. In group A patients, 12(40.0%) were male and 18(60.0%) female. In group B patients 14(46.7%) were male and 16(53.3%) were female. After 4 months all the patients were in grade I in both the groups. After 8 months all the patients were in grade I in group A and 27(90.0%) patients in grade I in group B. After 12 months all the patients were in grade I in group A and 25(83.3%) patients were in grade I in group B. The difference was not statistically significant (p>0.05) after 8 months, however after 12 months the difference was significant (p<0.05). The Fiber Reinforced Composite crown represents a valuable development in the field of Prosthetic Dentistry. DOI: http://dx.doi.org/10.3329/bjdre.v5i1.22450 Bangladesh Journal of Dental Research and Education Vol.5(1) 2015: 01-05
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Vojdani, Mahroo, Kianoosh Torabi, Sasan Rasaeipour, Amir Alireza Khaledi, and Safoura Ghodsi. "Evaluation of the Effect of a Home-bleaching Agent on the Surface Characteristics of Indirect Esthetic Restorative Materials: Part I—Roughness." Journal of Contemporary Dental Practice 15, no. 3 (2014): 326–30. http://dx.doi.org/10.5005/jp-journals-10024-1537.
Анотація:
ABSTRACT Background Pressing esthetic demands of good looking make people undergo bleaching procedures. However, the effect of bleaching agents on esthetic restorative materials with different surface preparations has been poorly studied. Aim The aim of this study was to examine the effect of a homebleaching agent (carbamide peroxide: CP 38%) on the surface roughness of the polished fiber reinforced composite (FRC), overglazed, autoglazed, or polished ceramic samples. Materials and methods Twenty standardized cylindrical specimens were made of each of the following groups: overglazed, autoglazed, polished porcelain and also FRC. The test specimens exposed to the CP 38%, 15 minutes, twice a day for 2 weeks according to the manufacturer's recommendation. Six samples from each group were selected randomly to form negative controls. Surface roughness measurements (Ra, micrometer) for baseline, test and control specimens were performed by use of a profilometer. Paired t-test, Mann-Whitney test, and Kruskal-Wallis test were used for statistical analyses. Results The data showed that bleaching with CP 38% significantly increased the surface roughness of all the test samples (p < 0.05). The type of surface preparation caused significant differences between the susceptibility of porcelain subgroups to bleaching (p < 0.05). The polished porcelain specimens showed the highest changes after bleaching. Conclusion CP 38% significantly increases the surface roughness of the porcelains and FRC. The type of surface condition affects the amenability of the porcelain surface to the bleaching agent. Glazed porcelains were more resistant to roughness than the polished porcelains and also the composite. Clinical significance Roughening of porcelain and FRC occur following bleaching procedure. No special surface preparation of indirect esthetic restorative materials can completely preserve these materials from adverse effects of bleaching agents. How to cite this article Torabi K, Rasaeipour S, Khaledi AA, Vojdani M, Ghodsi S. Evaluation of the Effect of a Homebleaching Agent on the Surface Characteristics of Indirect Esthetic Restorative Materials: Part I—Roughness. J Contemp Dent Pract 2014;15(3):326-330.
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Vojdani, Mahroo, Kianoosh Torabi, Sasan Rasaeipour, Safoura Ghodsi, and Amir Ali Reza Khaledi. "Evaluation of the Effect of a Home Bleaching Agent on Surface Characteristics of Indirect Esthetic Restorative Materials—Part II Microhardness." Journal of Contemporary Dental Practice 15, no. 4 (2014): 438–43. http://dx.doi.org/10.5005/jp-journals-10024-1559.
Анотація:
ABSTRACT Background The exponential usage of esthetic restorative materials is beholden to society needs and desires. Interaction between the bleaching agents and the esthetic restorative materials is of critical importance. Aim This in vitro study has been conducted to evaluate the effect of a home bleaching agent, carbamide peroxide (CP) 38%, on the microhardness of the fiber reinforced composite (FRC), overglazed, autoglazed, or polished porcelain specimens. Materials and methods For overglazed, autoglazed, polished ceramics and also FRC cylindrical specimens (n = 20 per group) were prepared. The specimens were stored in distilled water at 37°C for 48 hours prior to testing. Six samples from each group were selected randomly as negative controls which were stored in distilled water at 37°C that was changed daily. CP 38% was applied on the test specimens for 15 minutes, twice a day for 14 days. By using Knoop-microhardness tester microhardness testing for baseline, control and test specimens was conducted. Data were statistically analyzed using paired t-test, Mann- Whitney test, and Kruskal-Wallis test. Results Home bleaching significantly decreased the surface microhardness of all the test samples (p < 0.05), whereas the control groups did not show statistically significant changes after 2 weeks. The polished porcelain and polished composite specimens showed the most significant change in microhardness after bleaching process (p < 0.05). Conclusion Although the type of surface preparation affects the susceptibility of the porcelain surface to the bleaching agent, no special preparation can preclude such adverse effects. Clinical Significance The contact of home bleaching agents with esthetic restorative materials is unavoidable. Therefore protecting these restorations from bleaching agents and reglazing or at least polishing the restorations after bleaching is recommended. How to cite this article Torabi K, Rasaeipour S, Ghodsi S, Khaledi AAR, Vojdani M. Evaluation of the Effect of a Home Bleaching Agent on Surface Characteristics of Indirect Esthetic Restorative Materials — Part II Microhardness. J Contemp Dent Pract 2014;15(4):438-443.
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Qu, Hong Chang, Hong Yuan Li, and Xuan Zhang. "Flexural Tests of Fiber-Reinforced-Concrete Beams Reinforced with FRP Rebars." Applied Mechanics and Materials 166-169 (May 2012): 1797–800. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1797.
Анотація:
This paper investigates the flexural performance of FRP/FRC hybrid reinforcement system as well as FRP/plain concrete beams. Test results showed that the crack widths of FRP/FRC beams were smaller than those of FRP/plain concrete beams at the different corresponding load. With the increase of load, the crack spacing slightly decreased. The plain concrete beams failed in a more brittle mode than the FRC beams. Once they reached their ultimate moments, the load dropped fleetly. Compared to the companion beam, the addition of fibers improved the flexural behavior.
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Novak, Josef, and Alena Kohoutkova. "Structural Fiber Reinforced Concrete Elements." Solid State Phenomena 259 (May 2017): 221–26. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.221.
Анотація:
The building industry offers a wide range of materials which can be used for the production of various structural elements. Fibre reinforced concrete (FRC) is a material which is more frequently utilized for concrete structures. The reason is its physical and mechanical properties which contribute to traditional concrete elements and structures various economical benefits such as structure subtlety, part or full elimination of conventional reinforcement, resistance to mechanical loading and surrounding environment. Therefore, it is necessary to search for appropriate structures where the benefits of FRC could be used. First of all it is necessary to seek for structures which owing to their geometry and intended use seem to be appropriate for FRC application. It can be either new structural elements or existing structural elements made of a different material. During a material optimization there are many parameters to take into account which include production costs, manufacturing technology, structural behaviour, ultimate bearing capacity and durability of proposed member. The efficiency of material optimization is determined by comparing these parameters. While it is relatively easy and cost efficient to determine and evaluate the production costs, structure durability and manufacturing technology, to describe the structural behaviour of innovative elements is a complex task. However there are many sophisticated software which are capable to accurately simulate the behaviour of structural elements by using modern computational methods. At the end of feasibility study, experimental testing is conducted on full-scale pilot elements with the aim to verify their real behaviour as well as to optimize the computational model. As a result, many innovative FRC based structural elements have been developed at Czech Technical University in Prague in cooperation with construction companies.
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Keulemans, Filip, Akikazu Shinya, Lippo V. J. Lassila, Pekka K. Vallittu, Cornelis J. Kleverlaan, Albert J. Feilzer, and Roeland J. G. De Moor. "Three-Dimensional Finite Element Analysis of Anterior Two-Unit Cantilever Resin-Bonded Fixed Dental Prostheses." Scientific World Journal 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/864389.
Анотація:
The aim of this study was to evaluate the influence of different framework materials on biomechanical behaviour of anterior two-unit cantilever resin-bonded fixed dental prostheses (RBFDPs). A three-dimensional finite element model of a two-unit cantilever RBFDP replacing a maxillary lateral incisor was created. Five framework materials were evaluated: direct fibre-reinforced composite (FRC-Z250), indirect fibre-reinforced composite (FRC-ES), gold alloy (M), glass ceramic (GC), and zirconia (ZI). Finite element analysis was performed and stress distribution was evaluated. A similar stress pattern, with stress concentrations in the connector area, was observed in RBFDPs for all materials. Maximal principal stress showed a decreasing order: ZI > M > GC > FRC-ES > FRC-Z250. The maximum displacement of RBFDPs was higher for FRC-Z250 and FRC-ES than for M, GC, and ZI. FE analysis depicted differences in location of the maximum stress at the luting cement interface between materials. For FRC-Z250 and FRC-ES, the maximum stress was located in the upper part of the proximal area of the retainer, whereas, for M, GC, and ZI, the maximum stress was located at the cervical outline of the retainer. The present study revealed differences in biomechanical behaviour between all RBFDPs. The general observation was that a RBFDP made of FRC provided a more favourable stress distribution.
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Hulle, Vrushabh K. "Experimental Study on Fiber Reinforced Concrete Using PVA Fiber and Glass Powder." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 2707–13. http://dx.doi.org/10.22214/ijraset.2021.37708.
Анотація:
Abstract: Concrete consisting of cement, water, fine and coarse aggregates are widely used in civil engineering constructions. Though making concrete is convenient and inexpensive, its brittle behavior upon tensile loading is one of its undesirable characteristics so that leads to the development of fiber reinforced concrete or engineered cementitious composites to improve this deficient. The Flexural strength of PVA (polyvinyl alcohol) FRC (fiber reinforced concrete) can be 150-200% greater than for normal concrete. According to Structural designers the damage tolerance and inherent tight crack width control of PVA FRC is found to be impressive in recent full-scale structural applications. If proper volume fractions are used the compressive strength PVA FRC can be similar to that of conventional concrete. The aim of this research work is to study compressive and tensile strength of FRC consisting PVA fiber & glass powder and studying the effect of glass powder in it. This research also gives rough idea on crack resistance capacity of FRC. In this paper we studied and provided detailed review on properties of PVA FRC with glass powder and experimentally identified the best ECC mix by analyzing the compressive & the flexural strength at different ratios like 0.5%, 1%, 1.5% of PVA fiber of total dry mix weight and in each case 15% of fine aggregate was replaced by glass powder. By conducting the compressive strength test and flexural strength test the maximum result we get at 28 days is 28.38Mpa and 8.95Mpa respectively which is more durable as compared to conventional concrete by IS 516:1959. So by analysis of results it can be seen that 1% mix is found to be optimum in all aspects. Keywords: PVA FRC, Polyvinyl Alcohol, Fibre Reinforced Concrete, Glass Powder.
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Chun, Pang Jo, and Mitao Ohga. "Effect of Fiber Diameter on Fatigue Strength of Fiber Reinforced Concrete and its Design." Applied Mechanics and Materials 138-139 (November 2011): 810–15. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.810.
Анотація:
This paper describes the effect of fiber diameter of fiber reinforced concrete (FRC) under fatigue behavior and its design method. Some researchers showed that the fatigue behavior of FRC is mainly governed by the bridging stress degradation, but little information is still available so far. We conducted fatigue tensile experiments of the FRC under constant strain amplitude first and the degradation of bridging stress was measured experimentally. Then, the micromechanics-based theoretical model is also developed, and the model is verified by the test results. The model accounts for the loss of fatigue ruptured fibers of which fatigue rupture is based on S-N relationships. The parametric study from the micromechanics-based theoretical model indicates that the best fiber diameter varies according to the number of cycles and strain level applied to the FRC specimen. The result suggests that we need to design FRC with considering the application and its loading conditions to utilize the capacity of FRC.
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Tošić, Nikola, Stanislav Aidarov, and Albert de la Fuente. "Systematic Review on the Creep of Fiber-Reinforced Concrete." Materials 13, no. 22 (November 12, 2020): 5098. http://dx.doi.org/10.3390/ma13225098.
Анотація:
Fiber-reinforced concrete (FRC) is increasingly used in structural applications owing to its benefits in terms of toughness, durability, ductility, construction cost and time. However, research on the creep behavior of FRC has not kept pace with other areas such as short-term properties. Therefore, this study aims to present a comprehensive and critical review of literature on the creep properties and behavior of FRC with recommendations for future research. A transparent literature search and filtering methodology were used to identify studies regarding creep on the single fiber level, FRC material level, and level of structural behavior of FRC members. Both experimental and theoretical research are analyzed. The results of the review show that, at the single fiber level, pull-out creep should be considered for steel fiber-reinforced concrete, whereas fiber creep can be a governing design parameter in the case of polymeric fiber reinforced concrete subjected to permanent tensile stresses incompatible with the mechanical time-dependent performance of the fiber. On the material level of FRC, a wide variety of test parameters still hinders the formulation of comprehensive constitutive models that allow proper consideration of the creep in the design of FRC elements. Although significant research remains to be carried out, the experience gained so far confirms that both steel and polymeric fibers can be used as concrete reinforcement provided certain limitations in terms of structural applications are imposed. Finally, by providing recommendations for future research, this study aims to contribute to code development and industry uptake of structural FRC applications.
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Huang, Jie, Yi Zhang, Yubin Tian, Hengheng Xiao, Jun Shi, Jiyang Shen, and Nianlin Zhang. "Research on the Dynamic Mechanical Properties and Constitutive Models of Steel Fiber Reinforced Concrete and Polypropylene Fiber Reinforced Concrete." Advances in Civil Engineering 2020 (February 11, 2020): 1–17. http://dx.doi.org/10.1155/2020/9174692.
Анотація:
This paper presents the results of an experimental research designed to investigate the dynamic mechanical properties and constitutive model of fiber reinforced concrete (FRC), including steel fiber reinforced concrete (SFRC) and polypropylene fiber reinforced concrete (PFRC) under fast loading. Experimental results are achieved by using the electrohydraulic servo loading test method, implying that the dynamic mechanical properties of PFRC and SFRC, such as peak stress, peak strain, and toughness, are positively affected by strain rate. The experimental elastic modulus test results of FRC with different fiber contents indicate that the elastic modulus is positively affected by polypropylene or steel fibers and increases with the increment of fiber content. Finally, the experimental stress-strain curves obtained in the MTS electrohydraulic servo system test are fitted by a damage dynamic constitutive model of FRC. The good fitting with experimental results proves that the model could be appropriate to describe the dynamic mechanical properties of FRC.
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Singh, Niraj Kumar, and Baboo Rai. "A Review of Fiber Synergy in Hybrid Fiber Reinforced Concrete." Journal of Applied Engineering Sciences 8, no. 2 (December 1, 2018): 41–50. http://dx.doi.org/10.2478/jaes-2018-0017.
Анотація:
Abstract Fibre reinforced concrete (FRC) presently utilized as a part of special structures subjected to dynamic loads for example airport pavements, expressways overlays, bridge decks and machine foundations. In most cases, FRC contains just a single kind of fibre. The utilization of at least two kinds of fibres in an appropriate mix can possibly improve the mechanical properties of concrete and result in performance synergy. The audit demonstrates that the blend of fibre allows a more powerful control of the dynamic crack development. This review analyses the components for synergistic impacts that gives direction on the fiber and matrix choice.
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Goremikins, Vadims, Lukas Blesak, Josef Novak, and Frantisek Wald. "EXPERIMENTAL METHOD ON INVESTIGATION OF FIBRE REINFORCED CONCRETE AT ELEVATED TEMPERATURES." Acta Polytechnica 56, no. 4 (August 31, 2016): 258–64. http://dx.doi.org/10.14311/ap.2016.56.0258.
Анотація:
<p>Generally speaking, adding a certain amount of steel fibres to a concrete mixture improves its mechanical properties. Currently, a lack of information considering tensile and post cracking behaviour of FRC at elevated temperatures is an issue to be faced. An experimental study of steel fibre reinforced concrete, also containing polymer fibres (FRC), subjected to high temperature is presented herein. Compressive strength, split tensile strength and ultimate bending strength were evaluated. Specimens were heated by the use of ceramic heaters and repacked for testing consequently. A finite-element based model was developed to predict the temperature distribution inside a specimen during both the heating and the cooling process.</p>
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Jamshidi Avanaki, Mohammad, Mohammad Abedi, and Abdollah Hoseini. "Stress-Strain Constitutive Material Models for Hybrid Steel Fiber Reinforced Concrete." Journal of Civil Engineering and Construction 9, no. 2 (May 15, 2020): 74–82. http://dx.doi.org/10.32732/jcec.2020.9.2.74.
Анотація:
Recent advancements in fiber reinforced concrete (FRC) technology has led to the development of fibrous concrete composites, comprised of fibers with different material and/or geometry, commonly known as hybrid FRC. In one type of hybrid FRC composites, advantageous behaviors of fibers of the same material but with different geometries are gathered in a single FRC mix. The aim of this paper is to develop and validate stress-strain relationships for hybrid steel FRC composites. Six different steel FRC mixes are produced and characterization tests are conducted. Cube, cylindrical and beam specimens are produced for each characterization test corresponding to each of the Steel FRC (SFRC) composites. In this regard, an experimental program is performed to determine the basic engineering properties of SFRC composites using standard compressive, splitting tensile and three-point bending tests. The prescribed procedure of the RILEM guideline, originally developed for non-hybrid FRC, is followed using the obtained experimental results to develop stress-strain behavior models for the SFRC mixes. To validate results for the hybrid SFRC composites, numerical simulations of the 3-point bending tests were performed and compared to that of corresponding experimental results. The results indicated that the proposed stress-strain relationships yield acceptable results for characterizing the behavior of hybrid SFRC composites.
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Garoushi, Sufyan, Pekka K. Vallittu, Akikazu Shinya, and Akiyoshi Shinya. "Fiber-reinforced Onlay Composite Resin Restoration: A Case Report." Journal of Contemporary Dental Practice 10, no. 4 (2009): 104–10. http://dx.doi.org/10.5005/jcdp-10-4-104.
Анотація:
Abstract Aim The purpose of this case report is to describe the clinical procedure for fabricating fiber-reinforced composite (FRC) onlay composite resin restorations using a FRC as the substructure. Background A variety of therapeutic modalities are available to restore teeth with moderate coronal defects in the posterior region of the mouth. For patients who refuse complete crown restorations or when minimal tooth reduction is preferred, a FRC restoration can be a good alternative to conventional restorative techniques. Case Report A 42-year-old female patient presented with an endodontically treated mandibular right first molar with extensive destruction of the coronal tooth structure. To conserve the remaining tooth structure a FRC resin core substructure was fabricated and veneered with Ceramage dentin and enamel hybrid composite to create the final restoration. Summary FRC restorations using adhesive technology appears to be a promising restorative option. However, further clinical investigation will be required to provide additional information on this technique. Based on the clinical and radiographic findings in the present case, the fabrication of a conventional crown was avoided in order to conserve the remaining tooth structure. Clinical Significance The restoration of badly damaged teeth is a challenge for clinicians when cast crown restorations are not an option for the patient. The use of FRC restorations along with adhesive technology may be a rational restorative alternative in the near future. Citation Garoushi S, Shinya A, Shinya A, Vallittu PK. Fiber-reinforced Onlay Composite Resin Restoration: A Case Report. J Contemp Dent Pract 2009 July; (10)4:104-110.
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Lassila, Lippo V. J., and Pekka K. Vallittu. "The Effect of Fiber Position and Polymerization Condition on the Flexural Properties of Fiber-Reinforced Composite." Journal of Contemporary Dental Practice 5, no. 2 (2004): 14–26. http://dx.doi.org/10.5005/jcdp-5-2-14.
Анотація:
Abstract The aim of this study was to investigate the influence of the position of the fiber rich layer on the flexural properties of fiber-reinforced composite (FRC) construction. In addition, the total residual monomer content of FRC was quantitatively determined to find out the difference of the effectiveness of two types of light-curing units using liquid chromatography (HPLC). Unidirectional continuous E-glass FRC and hybrid particulate filler composite resins were used in the fabrication of test specimens. Four different positions of the FRC layer were used: compression, neutral, tension, and vertical side position. A three-point bending test (ISO 10477) was performed to measure the flexural properties of the specimens. Position of the FRC layer had a significant effect on the flexural strength (p<0.001, ANOVA). Also, the type of light-curing device had an effect on flexural strength (p<0.001). Specimens with FRC positioned on the compression side showed flexural strength of approximately 250 MPa, whereas FRC positioned on the tension side showed strength ranging from 500 to 600 MPa. Mean flexural modulus with FRC placed horizontally ranged between 9-12 GPa; no significant difference was found between these groups. However when fiber reinforcement was positioned vertically, the flexural modulus raised up to 16 GPa. Specimens with 24 vol% glass fibers contained 52% less residual monomer than specimens without glass fibers. The monomer content was lower in specimens polymerized with the curing device with higher polymerization temperature. In order to optimize flexural strength of low fiber volume fraction, the fibers should be placed at the tension side of the specimen. Citation Lassila LVJ, Vallittu PK. The Effect of Fiber Position and Polymerization Condition on the Flexural Properties of Fiber-Reinforced Composite. J Contemp Dent Pract 2004 May;(5)2:014-026.
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Sfondrini, Maria Francesca, Paola Gandini, Paola Tessera, Pekka K. Vallittu, Lippo Lassila, and Andrea Scribante. "Bending Properties of Fiber-Reinforced Composites Retainers Bonded with Spot-Composite Coverage." BioMed Research International 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/8469090.
Анотація:
Orthodontic and periodontal splints are prepared with round or flat metallic wires. As these devices cannot be used in patients with allergy to metals or with aesthetic demands, fiber-reinforced composite (FRC) retainers have been introduced. Stiffness of FRC materials could reduce physiologic tooth movement. In order to lower rigidity of conventional FRC retainers, a modified construction technique that provided a partial (spot) composite coverage of the fiber has been tested and compared with metallic splints and full-bonded FRCs. Flat (Bond-a-Braid, Reliance Orthodontic Products) and round (Penta-one 0155, Masel Orthodontics) stainless steel splints, conventional FRC splints, and experimental spot-bonded FRC retainers (Everstick Ortho, StickTech) were investigated. The strength to bend the retainers at 0.1 mm deflection and at maximum load was measured with a modified Frasaco model. No significant differences were reported among load values of stainless steel wires and experimental spot-bonded FRC retainers at 0.1 mm deflection. Higher strength values were recoded for conventional full-bonded FRCs. At maximum load no significant differences were reported between metallic splints (flat and round) and experimental spot-bonded FRCs, and no significant differences were reported between spot- and full-bonded FRC splints. These results encourage further tests in order to evaluate clinical applications of experimental spot-bonded FRC retainers.
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Al-Baghdadi, Haider M., Faiz H. Al-Merib, Ayoob A. Ibrahim, Rafea F. Hassan, and Husam H. Hussein. "Effects of Coarse Aggregate Maximum Size on Synthetic/Steel Fiber Reinforced Concrete Performance with Different Fiber Parameters." Buildings 11, no. 4 (April 13, 2021): 158. http://dx.doi.org/10.3390/buildings11040158.
Анотація:
Recently, fiber has been incorporated into concrete mixtures, where its distribution in the concrete matrix helps to improve and enhance the mechanical properties of fiber-reinforced concrete (FRC). The aim of this study is to investigate the influence of steel and synthetic fiber parameters, along with different coarse aggregate maximum sizes (CAMZs) on FRC performance. Additionally, in past research, the empirical relationships among the compressive, tensile, and flexural strengths of plain concrete and FRC were assessed, and correlations between these mechanical properties of FRC were examined. For each CAMZ, four fiber dosages for each fiber type were considered. The results demonstrate the mechanical properties of FRC enhanced as the fiber length increased from 13 mm to 60 mm, the CAMZ increased from 9.5 mm to 37.5 mm, and the ratio of the fiber length to the CAMZ was in the range of 0.35–5.68. All mixtures have been intended to exhibit similar compressive strengths; however, the synthetic/steel fiber advanced the brittleness ratio of specimens with G10, G19, and G38 to approximately 36.8%, 40.7%, and 47.4% greater than the contral specimens, respectively. In addition, from the regression analysis investigation, there are strong correlations from the regression analysis of the mechanical property results of FRC.
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Fransiska, Aria, Siti Sunarintyas, and Rini Dharmastiti. "Effect of Bombyx mori silk-fiber volume on flexural strength of fiber-reinforced composite." Majalah Kedokteran Gigi Indonesia 4, no. 2 (February 18, 2019): 75. http://dx.doi.org/10.22146/majkedgiind.25186.
Анотація:
Dental glass fiber is one of dental synthetic fibers that are widely used in dentistry as a dental resin reinforcement, such as in dentin replacement material. The availability of glass fiber is limited in Indonesia because it must be imported and relatively expensive. Bombyx mori silk-fiber is one of the strongest natural fiber derived from silkworm cocoon processing. Silk-fiber is used in medical applications as a post-surgical sutures, scaffolds for tissue engineering and drug delivery. The purpose of this study was to evaluate the effect of Bombyx mori silk-fiber volume on the flexural strength of fiber-reinforced composite (FRC). We used Bombyx mori silk-fiber (Perhutani Pati, Central Java, Indonesia) and flowable composite (Charmfil flow, Denkist, Korea) in this study. The FRC samples were divided into 4 groups consisting of fiber volumes of 0%, 5%, 10% and 15% (n = 4). Tests of flexural strength were performed according to ISO 4049. The results were analyzed using one way ANOVA (p<0.05). The study showed that the means of the flexural strength (MPa) of Bombyx mori silk-fiber FRC for volume of 0%, 5%, 10% and 15% were 149.2 ± 5.5; 127.6 ± 3.8; 110.9 ± 3.5; 71.2 ± 4.2. One-way ANOVA test showed that the means of FRC flexural strength on the four groups’ silk-fiber Bombyx mori volumetric were significantly different (p<0.05). This study concluded that Bombyx mori silk-fiber volumetric influences the flexural strength of fiber- reinforced composite. An increase in Bombyx mori silk-fiber volume decreases the flexural strength of FRC because there is a small gap due to the weak interfacial bonds between dental flowable composite and Bombyx mori silk-silk-fiber.
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Khalil, Abdulghani Ali, Widowati Siswomiharjo, and Siti Sunarintyas. "EFFECT OF NON DENTAL GLASS FIBER ORIENTATION ON TRANSVERSE STRENGTH OF DENTAL FIBER REINFORCED COMPOSITE." Jurnal Teknosains 5, no. 2 (August 30, 2017): 104. http://dx.doi.org/10.22146/teknosains.9131.
Анотація:
FRC is widely used in dentistry especially for dental bridges construction. E glass fiber is commonly used because it has good properties and good bonding with polymers. Its availability is limited and its price quite expensive in Indonesia. Non dental glass fiber is available in Indonesia with lower price. The aim of this research was to evaluate the effect of non dental glass fiber orientation on transverse strength of dental FRC. Non dental glass fiber (HJ, China) with two orientations (Roving and Woven roving), Flowable composite (CharmFil Flow, DenKist, Korea) , Silane coupling agent (Monobond S, Ivoclar Vivadent, Liechtenstein) and distilled water. 24 specimens of non dental glass FRC, divided into 2 groups. The specimens was immersed in water for 24 hours and 7 days. The data were analyzed by Independent sample T-test. T-test analysis showed that for transverse strength with 24 hours water immersion there was a significant difference between the two orientation groups (p< 0.05). The data of 7 days immersion there was no statistical difference between the groups (p> 0.05). In conclusion: there was different transverse strength between roving and woven roving orientation in dental FRC.
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Mena-Álvarez, Jesús, Rubén Agustín-Panadero, and Alvaro Zubizarreta-Macho. "Effect of Fiber-Reinforced Composite and Elastic Post on the Fracture Resistance of Premolars with Root Canal Treatment—An In Vitro Pilot Study." Applied Sciences 10, no. 21 (October 28, 2020): 7616. http://dx.doi.org/10.3390/app10217616.
Анотація:
(1) Background: To analyze the fracture resistance of endodontically upper premolar teeth restored with glass fiber reinforced posts, glass fiber elastic posts, conventional composite resin (CR) and glass fiber reinforced composite (FRC) resins as restorations. (2) Methods: Seventy premolars were submitted to root canal treatment and restored with the following restorative materials (n = 10): A. FRC posts restored with resin; B. Elastic FRC posts restored with resin; C. FRC posts restored with FRC resin; D. Elastic FRC posts restored with FRC resin; E. Direct restoration with resin; F. Direct restoration with FRC resin; G. Untreated teeth. The teeth were embedded in an epoxy resin model, thermal cycling fatigued in distilled water and mechanical cycling fatigued inducing 80 N load. Loading was applied axially on the center of the occlusal surface with a vertical displacement. The fracture was produced by a universal machine at a crosshead speed of 0.5 mm/s with a 5000 N load cell. The results were analyzed by ANOVA and Tukey’s test and Weibull characteristic strength and modulus were calculated. (3) Results: The group that obtained the greatest fracture resistance was D (3620 ± 470 N) and the least resistant was group A (2420 ± 1010 N). Statistically significant differences were observed between the groups restored with Elastic FRC posts-CR versus FRC post-CR and only CR (p = 0.043 and p = 0.008). (4) Conclusions: The glass fiber reinforced restorative materials increase the fracture resistance of endodontically treated teeth.
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Chen, Le, Weiwei Sun, Bingcheng Chen, Sen Xu, Jianguo Liang, Chufan Ding, and Jun Feng. "A Comparative Study on Blast-Resistant Performance of Steel and PVA Fiber-Reinforced Concrete: Experimental and Numerical Analyses." Crystals 10, no. 8 (August 16, 2020): 707. http://dx.doi.org/10.3390/cryst10080707.
Анотація:
This paper deals with the blast-resistant performance of steel fiber-reinforced concrete (SFRC) and polyvinyl alcohol (PVA) fiber-reinforced concrete (PVA-FRC) panels with a contact detonation test both experimentally and numerically. With 2% fiber volumetric content, SFRC and PVA-FRC specimens were prepared and comparatively tested in comparison with plain concrete (PC). SFRC was found to exhibit better blast-resistant performance than PVA-FRC. The dynamic mechanical responses of FRC panels were numerically studied with Lattice Discrete Particle Model-Fiber (LDPM-F) which was recently developed to simulate the meso-structure of quasi-brittle materials. The effect of dispersed fibers was also introduced in this discrete model as a natural extension. Calibration of LDPM-F model parameters was achieved by fitting the compression and bending responses. A numerical model of FRC contact detonation was then validated against the blast test results in terms of damage modes and crater dimensions. Finally, FRC panels with different fiber volumetric fractions (e.g., 0.5%, 1.0% and 1.5%) under blast loadings were further investigated with the validated LDPM-F blast model. The numerical predictions shed some light on the fiber content effect on the FRC blast resistance performance.
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Piitulainen, Jaakko M., Riina Mattila, Niko Moritz, and Pekka K. Vallittu. "Load-Bearing Capacity and Fracture Behavior of Glass Fiber-Reinforced Composite Cranioplasty Implants." Journal of Applied Biomaterials & Functional Materials 15, no. 4 (January 2017): e356-e361. http://dx.doi.org/10.5301/jabfm.5000375.
Анотація:
Background Glass fiber-reinforced composites (FRCs) have been adapted for routine clinical use in various dental restorations and are presently also used in cranial implants. The aim of this study was to measure the load-bearing capacity and failure type of glass FRC implants during static loading with and without interconnective bars and with different fixation modes. Methods Load-bearing capacities of 2 types of FRC implants with 4 different fixation modes were experimentally tested. The sandwich-like FRC implants were made of 2 sheets of woven FRC fabric, which consisted of silanized, woven E-glass fiber fabrics impregnated in BisGMA-TEGDMA monomer resin matrix. The space between the outer and inner surfaces was filled with glass particles. All FRC implants were tested up to a 10-mm deflection with load-bearing capacity determined at 6-mm deflection. The experimental groups were compared using non-parametric Kruskal-Wallis analysis with Steel-Dwass post hoc test. Results FRC implants underwent elastic and plastic deformation until 6-mm deflection. The loading test did not demonstrate any protrusions of glass fibers or cut fiber even at 10-mm deflection. An elastic and plastic deformation of the implant occurred until the FRC sheets were separated from each other. In the cases of the freestanding setup (no fixation) and the fixation with 6 screws, the FRC implants with 2 interconnective bars showed a significantly higher load-bearing capacity compared with the implant without interconnective bars. Conclusions FRC implants used in this study showed a load-bearing capacity which may provide protection for the brain after cranial bone defect reconstruction.
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Murdiyanto, Dendy, Widjijono Widjijono, and Nuryono Nuryono. "PENGARUH JENIS DAN LAMA PERENDAMAN NON DENTAL GLASS FIBER REINFORCED COMPOSITE TERHADAP SITOTOKSISITAS SEL FIBROBLAS." B-Dent, Jurnal Kedokteran Gigi Universitas Baiturrahmah 2, no. 1 (November 10, 2018): 36–43. http://dx.doi.org/10.33854/jbdjbd.13.
Анотація:
Perawatan di kedokteran gigi mulai menggunakan material fiber reinforced composite (FRC) sebagai bahan penyusun alat-alat tertentu seperti gigi tiruan cekat, restorasi onlay, splinting gigi goyah, pasak gigi dan space maintainer. Penyusun FRC terdiri dari fiber dengan jenis terbanyak glass fiber dan matriks berupa dental composite. Non dental glass fiber merupakan jenis glass fiber yang digunakan pada pembuatan gypsum, patung dan alat-alat otomotif yang mudah dijumpai di pasaran dengan harga terjangkau. Tujuan penelitian ini adalah untuk mengetahui potensi sitotoksisitas jenis dan lama perendaman non dental glass fiber reinforced composite terhadap sel fibroblas yang mati. Penelitian ini menggunakan FRC yang diperkuat oleh 3 jenis non dental glass fiber I, II, III dan dental E-glass fiber sebagai pembanding. Uji sitotoksisitas dilakukan dengan methyl tetrazolium test (MTT) menggunakan sel vero terhadap air hasil rendaman FRC selama 1, 4, 7 dan 10 hari masing-masing 6 pengulangan sampel tiap kelompok. Jumlah sel yang mati menunjukkan tingkat sitotoksisitas dan kemudian dianalisa dengan Anava dua jalur (α = 0,05).Hasil penelitian menunjukkan rata-rata kematian sel tertinggi yaitu 8,55 ± 0,27 % pada FRC III dengan lama perendaman 10 hari, sedangkan rata-rata kematian sel terendah yaitu 8,48 ± 0,35 % pada dental glass fiber dengan lama perendaman 1 hari. Berdasarkan pedoman dari Sjögren bahan tidak bersifat sitotoksis jika kematian sel masih dibawah 10%. Uji Anava dua jalur menunjukkan bahwa jenis non dental glass fiber reinforced composite dan lama perendaman mempunyai pengaruh tidak bermakna (p>0,05) terhadap sitotoksisitas sel fibroblas. Kesimpulan hasil penelitian yaitu non dental glass fiber reinforced composite tidak bersifat sitotoksis terhadap sel fibroblas, jenis non dental glass fiber reinforced composite dan lama perendaman tidak berpengaruh terhadap sitotoksisitas sel fibroblas
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Hedjazi, Saman, and Daniel Castillo. "Effect of fiber types on the electrical properties of fiber reinforced concrete." Materials Express 10, no. 5 (May 1, 2020): 733–39. http://dx.doi.org/10.1166/mex.2020.1679.
Анотація:
Using fibers in concrete, has been recognized as a practical method to improve concrete properties such as reduction in crack development and higher resistance against impact and abrasion. Dry cementitious material exhibits very high electrical resistivity. However, fibers can significantly decrease the electrical resistivity of concrete which affects its insulating nature and has negative effects on concrete properties such as durability and also in special cases such as rail road ties production. In this paper the effect of steel, glass, and nylon fiber on the electrical properties of Fiber Reinforced Concrete (FRC) is investigated. Six different fiber volume fractions (Vf) (0.10% vol., 0.25% vol., 0.50% vol., 0.75% vol., 1.00% vol., 1.50% vol.) and several water-to-cement ratios (w/c) were considered as the main variables in the present study. In order to test the electrical properties of FRC, 100 mm × 200 mm cylinders were casted, cured and tested. The four point technique was used for measuring the surface electrical resistivity of concrete after curing in water for 3, 7, 28, and 44 days. Additionally, the compressive strength of each specimen was determined experimentally using the Compression Test Machine. The results revealed that the electrical resistivity of FRC decreases with an increase in fiber content but different types of fibers have different electrical effects on concrete. The effects of different volume fractions of three fiber types, together with different concrete mix proportions are presented and discussed.
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Dhamayanti, Intan, and Tunjung Nugraheni. "Restorasi Fiber Reinforced Composite Pada Gigi Premolar Pertama Kanan Mandibula Pasca Perawatan Saluran Akar." Majalah Kedokteran Gigi Indonesia 20, no. 1 (June 1, 2013): 65. http://dx.doi.org/10.22146/majkedgiind.8382.
Анотація:
Gigi yang telah dilakukan perawatan saluran akar membutuhkan restorasi yang tepat untuk mencegah terjadinya fraktur. Restorasi menggunakan fiber reinforced composite (FRC) memiliki resistensi yang tinggi terhadap fraktur dan estetiknya memuaskan. Laporan kasus ini bertujuan melaporkan restorasi menggunakan FRC pada gigi premolar pertama kanan mandibula pasca perawatan saluran akar. Pada kasus ini, pasien wanita 35 tahun, gigi premolar pertama kanan mandibula mengalami nekrosis pulpa. Untuk mengatasi kasus ini dilakukan perawatan saluran akar dengan metode crown down dan obturasi dengan single cone. Restorasi menggunakan FRC dibuat sebagai restorasi akhir. Kesimpulan penanganan kasus, restorasi menggunakan FRC dapat menjadi pilihan restorasi pada gigi premolar pertama kanan mandibula pasca perawatan saluran akar.Fiber Reinforced Composite Restoration on Right Mandibular First Premolar Tooth after Root Canal Treatment. Endodontically treated tooth requires precise restoration that can prevent fracture. Restoration using fiber reinforced composite (FRC) has high resistance to the fracture and aesthetical satisfaction. This case report aims to describe the restoration using FRC on right mandibular first premolar tooth after root canal treatment. In this case, the patient was a 35 year-old woman who suffered from pulp necrosis on her right mandibular first premolar tooth. To treat this case, root canal treatment with crown down method and single cone’s obturation was done. Restoration using FRC is made as the final restoration. From treatment, it can be concluded that restoration using FRC can be an option for restoration of right mandibular first premolar tooth after root canal treatment
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Tu, Xiao Qing, Ya Fang Zhang, and Hao Liu. "Effect of Interface Elastic Modulus on Damage Mechanism of the Fiber Reinforced Concrete." Advanced Materials Research 450-451 (January 2012): 1562–66. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.1562.
Анотація:
This research focuses on the interface’s impact on the macro-mechanics and damage mechanism of the fiber reinforced concrete (FRC). In consideration of the mesoscopic nonhomogeneity of the interface, numerical test has been adopted to simulate failure procedure of fiber reinforced concrete samples. It can, therefore, be concluded, that, the interface elastic modulus have a great impact on the macro-mechanics of the FRC. With interfaces added into FRC, failure could present ductile properties, cracks could be developed horizontally, and then unbonded and slid along the interface. During the process, phenomenons such as interface debonding and sliding, crack deflection, fiber bridging and pulling out could be clearly observed. Under With the premise that strength for interface is adequate for stress transferring, the toughness of the FRC would be enhanced by the interface.
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Lassila, Lippo V. J., Pekka K. Vallittu, and Sufyan K. Garoushi. "Short Fiber Reinforced Composite: The Effect of Fiber Length and Volume Fraction." Journal of Contemporary Dental Practice 7, no. 5 (2006): 10–17. http://dx.doi.org/10.5005/jcdp-7-5-10.
Анотація:
Abstract Aim The aim of this study was to determine the effect of short fiber volume fraction and fiber length on some mechanical properties of short fiber-reinforced composite (FRC). Methods and Materials Test specimens (2 x 2 x 25 mm3) and (9.5 x 5.5 x 3 mm3) were made from short random FRC and prepared with different fiber volumes (0%-22%) and fiber lengths (1-6 mm). Control specimens did not contain fiber reinforcement. The test specimens (n=6) were either dry stored or thermocycled in water (x10.000, 5 – 55°C) before loading (three-point bending test) according to ISO 10477 or statically loaded with a steel ball (Ø 3.0 mm) with a speed of 1.0 mm/min until fracture. A universal testing machine was used to determine the flexural properties and the load-bearing capacity. Data were analyzed using analysis of variance (ANOVA) (p=0.05) and a linear regression model. Results The highest flexural strength and fracture load values were registered for specimens with 22 vol% of fibers (330 MPa and 2308 N) and with 5 mm fiber length (281 MPa and 2222 N) in dry conditions. Mechanical properties of all test specimens decreased after thermocycling. ANOVA analysis revealed all factors were affected significantly on the mechanical properties (p<0.001). Conclusions By increasing the volume fraction and length of short fibers up to 5 mm, which was the optimum length, the mechanical properties of short FRC were improved. Citation Garoushi SK, Lassila LVJ, Vallittu PK. Short Fiber Reinforced Composite: The Effect of Fiber Length and Volume Fraction. J Contemp Dent Pract 2006 November;(7)5:010-017.
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Kimyong, Cha Yun, Sontipee Aimmanee, Vitoon Uthaisangsuk, and Wishsanuruk Wechsatol. "Micromechanics Damage Analysis in Fiber-Reinforced Composite Material Using Finite Element Method." Key Engineering Materials 525-526 (November 2012): 541–44. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.541.
Анотація:
Fiber-reinforced composite materials (FRC) are used in a wide range of applications, since FRC exhibits higher strength-to-density ratio in comparison to traditional materials due to long fibers embedded in a matrix material. Failures occurred in FRC components are complicated because of the interaction of the constituents. The aim of this study is to investigate damage behavior in a unidirectional glass fiber-reinforced epoxy on both macro-and micro-levels by using finite element method. The Hashins criterion was applied to define the onset of macroscopic damage. The progression of the macroscopic damage was described using the Matzenmiller-Lubliner-Taylor model that was based on fracture energy dissipation of material. To examine the microscopic failure FE representative volume elements consisting of the glass fibers surrounded by epoxy matrix with defined volume fraction was considered. Elastic-brittle isotropic behaviour and the Coulomb-Mohr criterion were applied for both fiber and epoxy. The results of the macroscopic and microscopic analyses were correlated. As a result, damage initiation and damage development for the investigated FRC could be predicted.
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Imam, Dian Noviyanti Agus, Siti Sunarintyas, and Nuryono Nuryono. "Pengaruh Komposisi Glass Fiber Non Dental dan Penambahan Silane terhadap Kekuatan Geser Fiber Reinforced Composite sebagai Retainer Ortodonsi." Majalah Kedokteran Gigi Indonesia 1, no. 1 (June 1, 2015): 53. http://dx.doi.org/10.22146/majkedgiind.8966.
Анотація:
Retainer dibutuhkan untuk membantu menstabilkan posisi gigi geligi selama proses reorganisasi jaringan periodontal berlangsung. Retainer FRC ortodonsi dikembangkan sebagai alternatif material estetika serta aman bagi pasien alergi terhadap nikel. E-glass fiber lebih sering digunakan sebagai retainer ortodonsi. Penelitian ini bertujuan untuk mengkaji pengaruh komposisi glass fiber non dental dan penambahan silane terhadap kekuatan geser FRC sebagai retainer ortodonsi. Subjek penelitian terdiri dari 9 kelompok perlakuan dengan 3 jenis glass fiber yang berbeda yaitu glass fiber non dental A (LT, Cina), B (CMAX, Cina) dan C (HJ, Cina). Masing-masing glass fiber diberi perlakuan yang bervariasi yaitu tanpa penambahan silane, penambahan silane 1x dan 2x. Subjek penelitian direndam dalam akuades dan disimpan pada suhu 37ºC selama 24 jam sebelum dilakukan uji kekuatan geser dengan menggunakan alat Universal Testing Machine. Hasil penelitian dianalisis variansi dua jalur dan post hoc Tukey untuk mengetahui perbedaan statistik masing-masing kelompok. Hasil penelitian menunjukkan bahwa glass fiber non dental A dengan penambahan 2x silane memiliki rerata kekuatan geser tertinggi (12,72±2,02 MPa) sedangkan glass fiber non dental B tanpa penambahan silane memiliki rerata kekuatan geser terendah (6,96±1,69 MPa). Terdapat perbedaan bermakna antara komposisi fiber maupun penambahan silane terhadap kekuatan geser FRC (p<0,05). Tidak terdapat perbedaan bermakna pada letak kegagalan FRC (p>0,05). Berdasarkan hasil penelitian dapat disimpulkan bahwa komposisi SiO2 dan Al2O3 yang tinggi pada glass fiber non dental serta penambahan silane dapat meningkatkan kekuatan geser FRC. The Effect of Non Dental Glass Fiber Composition and Silane Addition on The Shear Bond Strength of Fiber Reinforced Composite as An Orthodontic Retainer. Retainers are required to stabilize the position of the teeth to permit reorganization of periodontal tissue. FRC orthodontic retainer was developed as an alternative material aesthetic and safe for nickel allergic patients. E-glass fiber is commonly used as an orthodontic retainer. The purpose of this study was to assess the effect of non dental glass fiber composition and silanes addition on the shear bond strength of the FRC as an orthodontic retainer. This study consisted of 9 treatment groups with three different types of non dental glass fiber, namely non dental glass fiber A (LT, China), B (CMAX, China) and C (HJ, China). Each glass fiber was given a variation treatment, without silanes, one time and two times of silanes addition. All the samples were stored in distilled water at 37ºC for 24 hours and subsequently tested for shear strength by using Universal Testing Machine.The groups were submitted to two way ANOVA analysis of variance with Tukey post test to verify the statictical difference between groups. The results showed that a non dental glass fiber A with two times of silanes addition has the highest shear bond strength (12,72±2,02 MPa), meanwhile a non dental glass fiber B without silane addition has the lowest shear bond strength (6,96±1,69 MPa). There were significant differences between the composition of glass fiber and the addition of silane toward the shear bond strength of FRC (p<0,05). No significant differences in debonded locations of FRC (p>0,05). Based on the results of this study concluded that the composition of the high SiO2 and Al2O3 in the non dental glass fiber and the silanes addition can increase the shear bond strength FRC.
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Fennis, Willem M. M., Cees M. Kreulen, Arzu Tezvergil, Lippo V. J. Lassila, Pekka K. Vallittu, and Nico H. J. Creugers. "In Vitro Repair of Fractured Fiber-Reinforced Cusp-Replacing Composite Restorations." International Journal of Dentistry 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/165938.
Анотація:
Objective. To assess fracture resistance and failure mode of repaired fiber-reinforced composite (FRC) cusp-replacing restorations.Methods. Sixteen extracted human premolars with fractured cusp-replacing woven (Group (A)) or unidirectional (Group (B)) FRC restorations from a previous loading experiment were repaired with resin composite and loaded to fracture.Results. Differences in fracture loads between groups were not statistically significant (P=0.34). Fracture loads of repaired specimens were significantly lower than those of original specimens (P=0.02for Group (A) andP<0.001for Group (B)). Majority of specimens showed failure along the repaired surface. In Group (B) 89% of specimens showed intact tooth substrate after restoration fracture, while this was 28% in Group (A) (P=0.04).Conclusion. Fractured cusp-replacing FRC restorations that are repaired with resin composite show about half of fracture resistance of original restorations. Mode of failure with a base of unidirectional fibers is predominantly adhesive.
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Lassila, Lippo, Pekka Vallittu, Ahmed Ballo, and Timo Nărhi. "In vitro Mechanical Testing of Glass Fiber-reinforced Composite Used as Dental Implants." Journal of Contemporary Dental Practice 9, no. 2 (2008): 41–48. http://dx.doi.org/10.5005/jcdp-9-2-41.
Анотація:
Abstract Aim The aim of this study was to evaluate the design of fiber-reinforced composite (FRC) on some mechanical properties of a dental implant. Methods and Materials FRC implants were fabricated using different polymerization conditions and designs of the glass-fiber structure. Specimens were tested with a cantilever bending test and a torsional test. The degree of monomer conversion (DC%) was measured using a Fourier transform infrared spectroscopy (FTIR). Results Statistical analysis showed significant differences between groups revealing mean fracture load values from 437 N to 1461 N. The mean torsional force in fracture varied from 0.01 to 1.66 Nm. The DC% varied from 50% to 90%. Conclusion This study suggests by modifying the polymerization conditions and fiber orientation of FRC implants, the biomechanical properties of an FRC can be tailored to the needs of dental implants. Citation Ballo AM, Lassila LV, Närhi TO, Vallittu PK. In vitro Mechanical Testing of Glass Fiber-reinforced Composite Used as Dental Implants. J Contemp Dent Pract 2008 February;(9)2:041-048.
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Yuniva, Hasna Syifa, Widowati Siswomihardjo, and Siti Sunarintyas. "Pengaruh Lama Perendaman E-Glass Fiber Reinforced Composite dalam Obat Kumur Terhadap Kekuatan Fleksural." Jurnal Material Kedokteran Gigi 8, no. 1 (March 1, 2019): 30. http://dx.doi.org/10.32793/jmkg.v8i1.302.
Анотація:
Fiber reinforced composite (FRC) is a material consisting of a composite resin (matrix), fiber (reinforced) and silanes (to improve the adhesion strength). FRC can be used as a crown framework. More people used mouthwash for oral hygient. The objective of this study was to know the effect of the duration of E-glass FRC immersion into the mouthwash against the flexural strength. The research materials were E-glass (Fiber Splint Polydentia Multi-Layer, Switzerland), composite resin (Master Flow Biodynamic, Brazil), silane (Monobond Ivoclar Vivadent) and mouthwash (Listerine® Multi Protect). Twelve the beam-shaped specimens (25x2x2) mm The specimens were divided into 3 groups: K1 control group (was not immersed) K2 and K3 treatment groups (was immersed for 24 and 48 hours). The flexural strength value was measured using a universal testing machine (Pearson, Texas). The data were analyzed using one-way ANOVA followed-up by LSD. The results showed decrease of the average flexural strengths of mouthwash K1, K2 and K3. The one-way ANOVA test results showed that there was a significant P>0.05 in the duration of E-glass FRC immersion into the mouthwash against the flexural strength. The LSD test results showed significant differences between all treatment groups. The conclusion of this study is that the duration of E-glass FRC immersion into mouthwash will lower the strength of flexural E-glass FRC.
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Mohammadzadeh, Zahra, Iman Parisay, Maryam Mehrabkhani, Azam Sadat Madani, and Fatemeh Mazhari. "Clinical evaluation of fiber-reinforced composite crowns in pulp-treated primary molars: 12-month results." European Journal of Dentistry 10, no. 04 (October 2016): 522–28. http://dx.doi.org/10.4103/1305-7456.195177.
Анотація:
ABSTRACT Objective: The aim of this study was to evaluate the clinical performance of tooth-colored fiber-reinforced composite (FRC) crowns in pulp-treated second primary mandibular teeth. Materials and Methods: This split-mouth randomized, clinical trial performed on 67 children between 3 and 6 years with two primary mandibular second molars requiring pulp treatment. After pulp therapy, the teeth were randomly assigned to stainless steel crown (SSC) or FRC crown groups. Modified United States Public Health Service criteria were used to evaluate marginal integrity, marginal discoloration, and secondary caries in FRC crowns at intervals of 3, 6, and 12 months. Retention rate and gingival health were also compared between the two groups. The data were analyzed using Friedman, Cochran, and McNemar's tests at a significance level of 0.05. Results: Intact marginal integrity in FRC crowns at 3, 6, and 12 months were 93.2%, 94.8%, and 94.2%, respectively. Marginal discoloration and secondary caries were not found at any of the FRC crowns. The retention rates of the FRC crowns were 100%, 98.3%, and 89.7% at 3, 6 and 12 months, respectively, whereas all the SSCs were found to be present and intact after 12 months (P = 0.016). There was no statistically significant difference between the two groups in gingival health. Conclusion: According to the results of this study, it seems that when esthetics is a concern, in cooperative patients with good oral hygiene, FRC crowns can be considered as a valuable procedure.
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Akmal, Syazwani, Widowati Siswomihardjo, and Siti Sunarintyas. "Effect of immersion time in mouthwash on the flexural strength of polyethylene fiber-reinforced composite." Majalah Kedokteran Gigi Indonesia 6, no. 1 (July 15, 2020): 39. http://dx.doi.org/10.22146/majkedgiind.40194.
Анотація:
Fiber-reinforced composite (FRC) fixed dentures are exposed to various oral environments. One of the ways in maintaining good oral condition is by using mouthwash. Questions have been araised about the safety of prolongeduse of mouthwash towards FRC. The aim of this study was to evaluate the effect of immersion time in mouthwash on the flexural strength of polyethylene FRC. The specimens used were polyethylene FRC (Construct, KerrLab, USA) and flowable composite resin (Master Flow Biodinamica, Brazil). Block shaped specimens (2x2x25 mm) was light cured (n=12). Specimens were divided into threek groups of immersion: Group 1 (without immersion); Group 2 (24 hour immersion); Group 3 (48 hour immersion). The mouthwash used was Listerine Multi-Protect (Johnson & Johnson, Indonesia) (21.6% alcohol content). Flexure strength was measured by Universal Testing Machine. The results showed the average strength value (MPa) for Group 1 was 91.318 ± 12.466, Group 2 was 62.253 ± 8.027, and Group 3 was55.033 ± 3.373. Statistical analysis (ANOVA) showed that immersion time in mouthwash influenced the flexural strength of polyethylene FRC (p<0.05). LSD0.05 showed there were significant differences of flexural strength between Group1-Group 2, Group 1-Group 3 but not for Group 2-Group 3. In conclusion, the flexural strength of polyethylene FRC were decreased by the immersion time in mouthwash.
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Ni, Kun, Yun Xing Shi, Yi Ning Ding, Yan Gang Zhang, Jing Bin Shi, and Wei Liu. "Influence of Aspect Ratio of Hooked End Steel Fiber on Flexural Behavior of Fiber Reinforced Concrete." Key Engineering Materials 629-630 (October 2014): 560–64. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.560.
Анотація:
The aim of present work is to further investigate the flexural behavior of FRC with four types of hooked end steel fibers. The flexural toughness of FRC beams was tested under a three point bending system, and the data of experiments were analyzed according to the standard JGJ/T221-2010 and RILEM recommendation. The results showed equal dosage of different aspect ratio fibers didn’t result in the same flexural toughness. It was found that nominal ultimate flexural strength () and equivalent flexural strength () of beams increased as aspect ratio of the steel fiber was increased. However, the highest equivalent flexural strength () was obtained by the fiber with aspect ratio of 67.
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Rodsin, Kittipoom. "Ductility Enhancement of High Strength RC Columns Using Steel Fiber Reinforced Concrete (SFRC)." Advanced Materials Research 931-932 (May 2014): 463–67. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.463.
Анотація:
The principal aim of this research is to improve the seismic performance of high strength concrete (HSC) reinforced columns using fiber reinforced concrete (FRC) by mixing steel fiber into the concrete. Two reinforced concrete columns 200mm x 300mm in cross-section with a height of 1250 mm were tested under cyclic lateral loading. The first specimen was casted using high strength concrete of 100 MPa and the second specimens were also casted using similar concrete strength but the steel fiber of 0.5% by volume was added to the concrete in the plastic hinge region. Both columns were subjected to lateral cyclic load until the failure occurs. The test results showed that the use of FRC in the plastic hinge region could significantly improve column displacement ductility. The maximum drift at column failure at 4.5% for non-ductile column could increase to 8% in FRC column. It is evident that the cracks in FRC column are much smaller properly spread in the plastic hinge region and hence the plastic hinge could be able to rotate without lateral strength being compromised. In FRC column, concrete spalling was observed in a very high drift (7%) and bar buckling occurred at around 8% drift whilst in HSC column concrete spalling and bar buckling occurred at only 3.5% and 4% drift respectively. It was evident that the use of steel fiber in HSC columns could significantly improve seismic performance of the column.
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Fornůsek, Jindrich, and Michal Tvarog. "Influence of Casting Direction on Fracture Energy of Fiber-Reinforced Cement Composites." Key Engineering Materials 594-595 (December 2013): 444–48. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.444.
Анотація:
This paper is focused on behavior of fiber reinforced cement composites (FRC) and ultrahigh-performance fiber reinforced cement composites (UHPFRC) in dependence on the direction of casting. Twelve prismatic samples of size of 400 x 100 x 100 mm were cast into moulds; six of these were FRC and the other six were UHPFRC. Three samples of both series were cast in the common horizontal direction and the other three in the vertical way. It was found that fracture energy of horizontally cast prisms was approximately three times higher in both cases than the vertically cast ones. The peak loads of FRC were very similar for both ways of casting. On the other hand the UHPFRC behaved differently, the peak load of horizontally cast prisms was approximately 2,5 times higher than the vertically cast ones. It was demonstrated that these differences are caused by the way of casting and vibration.
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Lassila, Lippo, Anna-Maria Le Bell-Rönnlöf, Milla Lahdenperä, and Pekka Vallittu. "Bond Strength of Composite Resin Luting Cements to Fiber-reinforced Composite Root Canal Post." Journal of Contemporary Dental Practice 8, no. 6 (2007): 17–24. http://dx.doi.org/10.5005/jcdp-8-6-17.
Анотація:
Abstract Aims The aim of this study was to compare the attachment of different composite resin luting cements to a fiber-reinforced composite (FRC) post with a semi-interpenetrating polymer network polymer matrix. Methods and Materials Six different brands of composite resin luting cement stubs were applied on the surface of FRC post material and light-cured for 40 seconds. Shear bond strengths of luting cement stubs were measured using a universal testing machine. Results The differences in shear bond strengths between the cements were not statistically significant. Conclusion All of the tested composite resin luting cements provided acceptable attachment to the tested FRC post. The tested FRC post material is suitable to use with different composite resin luting cements. Citation Le Bell-Rönnlöf AM, Lahdenperä M, Lassila L, Vallittu P. Bond Strength of Composite Resin Luting Cements to Fiber-reinforced Composite Root Canal Post. J Contemp Dent Pract 2007 September; (8)6:017-024.
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Moechtar, Rifki, Siti Sunarintyas, and Muhammad Kusumawan Herliansyah. "The effect of silk concentration on the flexural strength of FRC as a Bone Graft." Majalah Kedokteran Gigi Indonesia 4, no. 2 (February 18, 2019): 107. http://dx.doi.org/10.22146/majkedgiind.31487.
Анотація:
Bone fractures are mostly caused by trauma and disease. In the therapeutic process of bone healing which often meets some constraints, bone graft is mainly used to ensure that the healing process takes place. A fiber reinforced composite (FRC) is a popular bone graft material that is made to resemble bone properties. FRC is normally comprised of polymer matrix, hydroxyapatite filler, and fiber. Hydroxyapatite is a bioactive material widely used as a bone graft. Silk fiber is known as a reliable material to increase mechanical strength of the FRC. On this basis, this study aims to determine the effect of silk fiber concentration on the flexural strength of FRC. Fiber reinforced composite made of Bis-GMA/TEGDMA/ UDMA resin (CharmFil®, DenKist, Korea), hydroxyapatite (Bioceramic Laboratory, DTMI UGM) and silk fiber (Perhutani, Pati) were divided into three groups. Each group contained different silk fiber concentrations which were 1%, 5% and 10%. The flexural strength test was performed with 3-point bending test according to ISO 10477. The result showed that FRC with silk fiber 1%, 5% and 10% respectively had flexural strength of 61.21 ± 8.43 MPa, 62.97 ± 3.92 MPa and 85.01 ± 7.71 MPa. The result of one way ANAVA analysis showed that mean of FRCs flexural strength were significantly different between one treatment group to another. Thus, it is conclusive that silk fiber has a significant effect on FRCs flexural strength. The addition of 10% concentration of silk fiber is proven to increase FRCs flexural strength.