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The influence of phosphoric acid and primer treatment on the evaluation of the adhesive resin cement/enamel interface. 磷酸和底漆处理对胶粘剂树脂水泥/牙釉质界面评价的影响。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-31 Epub Date: 2024-12-03 DOI: 10.4012/dmj.2024-214
Mengtian Zhao, Takaaki Sato, Abu Hasan Mohammad Khaled, Masaomi Ikeda, Yasushi Shimada
{"title":"The influence of phosphoric acid and primer treatment on the evaluation of the adhesive resin cement/enamel interface.","authors":"Mengtian Zhao, Takaaki Sato, Abu Hasan Mohammad Khaled, Masaomi Ikeda, Yasushi Shimada","doi":"10.4012/dmj.2024-214","DOIUrl":"10.4012/dmj.2024-214","url":null,"abstract":"<p><p>This study evaluated the influence of phosphoric acid and primer on enamel bonding performance using Panavia V5. Ground bovine enamels were assigned: using K-etchant syringe and Tooth Primer (CT), using K-etchant syringe (PA), using Tooth Primer (TP), neither K-etchant syringe nor Tooth Primer was used (NC). The micro-tensile bond strength values of CT and PA were significantly higher than TP. After thermal cycling, the values were higher in CT and PA. In the leakage test, line-shaped signal pattern at the adhesive interface was detected in NC, and the signal was partially detected in PA and TP. Observation of the adhesive interface after acid and base challenge confirmed tooth-like structures in groups except NC. Large spaces were observed between the enamel and cement in NC. Limited in this study, the lack of application of phosphoric acid or Tooth Primer may affect the enamel bonding performance.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"52-59"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142779691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bond strength of self-adhesive resin cement to definitive resin crown materials manufactured by additive and subtractive methods. 自粘树脂水泥与用增减法制造的确定树脂冠材料的粘结强度。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-31 Epub Date: 2024-12-07 DOI: 10.4012/dmj.2024-111
Elifnaz Ozen Sutuven, Nuray Capa Yildirim
{"title":"Bond strength of self-adhesive resin cement to definitive resin crown materials manufactured by additive and subtractive methods.","authors":"Elifnaz Ozen Sutuven, Nuray Capa Yildirim","doi":"10.4012/dmj.2024-111","DOIUrl":"10.4012/dmj.2024-111","url":null,"abstract":"<p><p>The aim was to compare different surface pretreatments on definitive resin crown materials manufactured additively or subtractively in terms of shear bond strength (SBS) values. Seven subgroups (n=10) were formed from additively manufactured VarseoSmile Crown Plus (VS) and subtractively manufactured Cerasmart270 blocks (CS) according to different surface pretreatments applied; sandblasting (subgroup SB), hydrofluoric acid (subgroup HF), Multi Primer (subgroup MP), subgroup SB-HF, subgroup SB-MP, subgroup SB-HF-MP, and control subgroup. A 3-mm-diameter composite was cemented onto each sample by self-adhesive resin cement. SBS values were measured and failure modes were analyzed after thermocycling. Data were analyzed with two-way ANOVA and Tukey HSD tests. The mean SBS value of VS was found significantly higher than CS (p<0.001). Subgroups SB-HF-MP, HF, SB-MP, and MP of VS exhibited the highest SBS values (p<0.001). The VS exhibited mostly cohesive failure, while CS exhibited mostly adhesive failure.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"41-51"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142794553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation of CMC/ACP/PHMB nanocomposites and preliminary study on their antibacterial and remineralization functions. CMC/ACP/PHMB纳米复合材料的制备及其抗菌和再矿化功能的初步研究。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-31 Epub Date: 2024-12-07 DOI: 10.4012/dmj.2024-184
Honglei Guo, Ning Wang, Xuan Ye, Xinye Zhou, Kai Zhang, Xu Zhang
{"title":"Preparation of CMC/ACP/PHMB nanocomposites and preliminary study on their antibacterial and remineralization functions.","authors":"Honglei Guo, Ning Wang, Xuan Ye, Xinye Zhou, Kai Zhang, Xu Zhang","doi":"10.4012/dmj.2024-184","DOIUrl":"10.4012/dmj.2024-184","url":null,"abstract":"<p><p>Caries is a chronic oral disease causing a series of complications. This study aims to develop a material that could remineralize demineralized enamel and simultaneously exert antibacterial effects. A carboxymethyl chitosan (CMC)/amorphous calcium phosphate (ACP)/polyhexamethylene biguanide hydrochloride (PHMB) nanocomposite was synthesized for the first time, and its stability, remineralization ability, and antibacterial properties were investigated in this study. PHMB has excellent antibacterial properties, was used as an additive to stabilize ACP. The enamel surface covered with CMC/ACP/PHMB showed a uniform layer with a similar elemental ratio to that of natural hydroxyapatite and the ratio of crystal diffraction peaks was close to that of natural enamel. The mechanical properties, including hardness and elastic modulus, of the enamel in all experimental groups were restored. The antibacterial effect of 240 mg/L CMC/ACP/PHMB was comparable to that of 0.12% CMC/ACP/chlorhexidine. This study provides a theoretical and experimental basis for the development of novel dual-function anticaries agent.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"60-72"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142794555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation with finite element analysis of a ball attachment overdenture prosthesis of a patient. 用有限元分析评价患者的球形附着覆盖义齿修复。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-31 Epub Date: 2024-12-21 DOI: 10.4012/dmj.2024-252
Hatice Özdemir, Burak Hülagü
{"title":"Evaluation with finite element analysis of a ball attachment overdenture prosthesis of a patient.","authors":"Hatice Özdemir, Burak Hülagü","doi":"10.4012/dmj.2024-252","DOIUrl":"10.4012/dmj.2024-252","url":null,"abstract":"<p><p>This study aimed to apply finite element analysis (FEA) to simulate the oral environment of a patient with an implant-supported overdenture prosthesis. A 3D mandibular model was created for a 45-year-old female patient from CT images, with mucosal thickness measured at 3 mm on average using ultrasonography. The overdenture prosthesis was scanned with an intraoral scanner and placed onto the 3D mandibular model. Displacement of the prosthesis and von Mises stress values of the implant, surrounding bone tissue, implant-prosthesis components, and mucosa were calculated under various masticatory loads. The study found that anterior mastication generated higher stress compared to unilateral and bilateral mastication. The addition of a third implant significantly reduced stress and improved prosthesis stability, particularly during bilateral mastication.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"112-120"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142876102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of resorption rate-controlled calcium carbonate ceramics as a substitute bone material. 可控制吸收速率的碳酸钙陶瓷替代骨材料的评价。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-31 Epub Date: 2024-12-28 DOI: 10.4012/dmj.2024-120
Shota Umemoto, Toshitake Furusawa, Hidero Unuma, Tomoyo Goto, Tohru Sekino
{"title":"Evaluation of resorption rate-controlled calcium carbonate ceramics as a substitute bone material.","authors":"Shota Umemoto, Toshitake Furusawa, Hidero Unuma, Tomoyo Goto, Tohru Sekino","doi":"10.4012/dmj.2024-120","DOIUrl":"10.4012/dmj.2024-120","url":null,"abstract":"<p><p>Artificial bone, primarily composed of calcium carbonate, demonstrates a higher resorption rate than calcium phosphate-based counterparts, suggesting potential for early bone replacement. Animal experiments using porous calcium carbonate ceramics have demonstrated bone formation superior to commercially available artificial bone after short-term implantation. Long-term implantation has yielded suboptimal results owing to resorption of both newly formed bone and implantation material. We prepared calcium carbonate ceramics added with silica (Si-CaCO<sub>3</sub>) to regulate the resorption rate. After 12 weeks of implantation, Si-CaCO<sub>3</sub> ceramics exhibited bone formation comparable to that of β-tricalcium phosphate (β-TCP) but less variability in the distribution of bone formation within the tissue. An in vitro dissolution test, serving as an indicator of in vivo resorption rate, revealed that Si-CaCO<sub>3</sub> ceramics exhibited an intermediate dissolution rate between high-purity calcium carbonate and β-TCP ceramics. Silica doping in CaCO<sub>3</sub> ceramics presents an effective approach for aligning material resorption with bone formation and growth.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"9-16"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142930632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of mechanical properties and ion-releasing of 3D printing resins containing S-PRG filler: A preliminary study. 含S-PRG填料的3D打印树脂的力学性能和离子释放评价：初步研究。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-31 Epub Date: 2024-12-03 DOI: 10.4012/dmj.2024-195
Yukiko Tsuji, Noriko Hiraishi, Masaomi Ikeda, Motohiro Uo, Yumi Tsuchida, Kei Ushijima, Toru Nikaido, Yasushi Shimada
{"title":"Evaluation of mechanical properties and ion-releasing of 3D printing resins containing S-PRG filler: A preliminary study.","authors":"Yukiko Tsuji, Noriko Hiraishi, Masaomi Ikeda, Motohiro Uo, Yumi Tsuchida, Kei Ushijima, Toru Nikaido, Yasushi Shimada","doi":"10.4012/dmj.2024-195","DOIUrl":"10.4012/dmj.2024-195","url":null,"abstract":"<p><p>This study aimed to evaluate ionic release, flexural strength and water absorption of UDMA resins containing 0-30 wt% surface pre-reacted glass-ionomer (S-PRG) filler fabricated by a DLP 3D printer. Release of Al, B, Na, Sr and F ions were measured by inductively coupled plasma (ICP) and an ion meter. Flexural strength test and water absorption measurements were performed according to the International Organization for Standardization (ISO) 4049 standard and ISO 1567 standard, respectively. Sr ions were released the most, followed by F, B, Na and Al ions. The highest flexural strength was recorded with the S-PRG filler amount 0 wt%, followed by the S-PRG filler amounts 30, 20 and 10 wt%. Water absorption after one week was below the 32 µg/mm<sup>3</sup> mark specified by ISO 1567. The release of ions was confirmed using UDMA-based photopolymerized resin containing S-PRG filler. Furthermore, the results suggest that this resin could be used for provisional restoration.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"34-40"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142779628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Inhibitory effects of Colocasia antiquorum var. esculenta varnish on inflammation and alveolar bone loss in a rat ligature-induced periodontitis model. 在大鼠结扎性牙周炎模型中，牙槽骨清漆对炎症和牙槽骨丢失的抑制作用。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-31 Epub Date: 2024-12-28 DOI: 10.4012/dmj.2024-180
Seong-Hee Moon, Seong-Jin Shin, Gyu-Yeon Shim, Hyun-Jin Kim, Seunghan Oh, Seong-Hwan Kim, Ji-Myung Bae
{"title":"Inhibitory effects of Colocasia antiquorum var. esculenta varnish on inflammation and alveolar bone loss in a rat ligature-induced periodontitis model.","authors":"Seong-Hee Moon, Seong-Jin Shin, Gyu-Yeon Shim, Hyun-Jin Kim, Seunghan Oh, Seong-Hwan Kim, Ji-Myung Bae","doi":"10.4012/dmj.2024-180","DOIUrl":"10.4012/dmj.2024-180","url":null,"abstract":"<p><p>We aimed to evaluate whether Colocasia antiquorum var. esculenta (CA) mixed with experimental varnish inhibits inflammation and alveolar bone loss in a rat ligature-induced periodontitis model. The minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC) were tested and cell viability of CA were also evaluated. The varnish mixed with CA (CAV) was applied to ligature site of Sprague-Dawley rats and alveolar bone loss and cytokines were measured. CA exhibited a MIC of 31.3 μg/mL and an MBC of 62.5 μg/mL against Porphyromonas gingivalis, with no cytotoxicity. The CAV group exhibited significantly lower levels of alveolar bone loss than the PC group (p<0.05). The expression of IL-1β, TNF-α, and IL-6 was significantly decreased, while that of Runx2 was significantly increased in the CAV than in the PC group (p<0.05). In conclusion, CAV demonstrated the potential to improve the symptoms of periodontitis.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"86-92"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142930637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Polymerization of resin cements by self-curing with or without adhesive treatment. 有或没有粘合剂处理的树脂水泥自固化聚合。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-18 DOI: 10.4012/dmj.2024-127
Su Young Lee, Yasushi Shimada, Alireza Sadr, Tomoko Tabata, Takaaki Sato, Ji-Eun Byun, Seung-Hoon Han
{"title":"Polymerization of resin cements by self-curing with or without adhesive treatment.","authors":"Su Young Lee, Yasushi Shimada, Alireza Sadr, Tomoko Tabata, Takaaki Sato, Ji-Eun Byun, Seung-Hoon Han","doi":"10.4012/dmj.2024-127","DOIUrl":"https://doi.org/10.4012/dmj.2024-127","url":null,"abstract":"<p><p>The primary aim of this study was to determine whether there is a difference in degree of conversion (DC) between resin cements polymerized with an adhesive and those without an adhesive. The secondary aim was to compare interfacial gap of zirconia restoration when resin cements are self-cured. The DC of resin cement was measured without adhesive treatment continuously for 15 min and at 24 h. The DC was measured again after light-curing or self-curing adhesive treatment. For interfacial gap evaluation, inlay cavities were prepared on extracted third molars. Zirconia restorations were fabricated and cemented with the resin cement. After thermo-cycling, interfacial gap at the restoration-tooth interface was investigated using swept-source optical coherence tomography (SS-OCT) imaging. The DC of resin cement with adhesive treatment differed depending on the adhesive, cement, and polymerization method (p<0.05). Interfacial gap was different depending on the adhesive and cement (p<0.05).</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143001749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Methacrylic acid/Tween 80 engineered amorphous calcium phosphate as an effective bioactive reinforcing nanofillers in dental adhesive. 甲基丙烯酸/Tween 80工程无定形磷酸钙作为牙胶粘剂中有效的生物活性增强纳米填料。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2025-01-18 DOI: 10.4012/dmj.2024-285
Siripatsorn Maimansomsuk, Paremai Teangrom, Chayada Teanchai, Chomdao Sinthuvanich, Pakorn Ruengket, Jakrada Attarataya, Khrongkhwan Akkarachaneeyakorn
{"title":"Methacrylic acid/Tween 80 engineered amorphous calcium phosphate as an effective bioactive reinforcing nanofillers in dental adhesive.","authors":"Siripatsorn Maimansomsuk, Paremai Teangrom, Chayada Teanchai, Chomdao Sinthuvanich, Pakorn Ruengket, Jakrada Attarataya, Khrongkhwan Akkarachaneeyakorn","doi":"10.4012/dmj.2024-285","DOIUrl":"https://doi.org/10.4012/dmj.2024-285","url":null,"abstract":"<p><p>Bioactive fillers in dental adhesives are designed to release beneficial ions, such as calcium and phosphate, to help in remineralization process, and preventing secondary caries. Their incorporation also aims to improve the longevity of dental restorations. Herein, CaP nanoparticles were synthesized through a water-in-oil emulsion method using Tween80 as a surfactant and methacrylic acid (MAA). MAA officiated as a co-surfactant and reduced the size of CaP nanoparticle, including improved compatibility with the components of dental adhesive. The incorporation of 2% T80/CaP/MAA nanofillers into dental adhesive demonstrated increased efficiency, as evidenced by a higher degree of conversion (%DC) and greater micro-tensile bond strength (μTBS). More importantly, T80/CaP/MAA nanofillers were able to induce remineralization process in the dental structure, which was confirmed by EDX mapping and IR imaging. Finally, a cytotoxicity assessment of the dental adhesive containing T80/CaP/MAA showed no significant adverse effects on human fibroblast cells.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143001797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new method to measure the mechanical properties of rotary endodontic Ni-Ti files: Measurement of 6-axis force/torque and automatic root canal preparation. 测量旋转根管治疗镍钛锉机械性能的新方法：测量六轴力/扭矩和自动根管预备。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-12-10 Epub Date: 2024-10-02 DOI: 10.4012/dmj.2024-082
Hyungwoo Lee, In-Bog Lee
{"title":"A new method to measure the mechanical properties of rotary endodontic Ni-Ti files: Measurement of 6-axis force/torque and automatic root canal preparation.","authors":"Hyungwoo Lee, In-Bog Lee","doi":"10.4012/dmj.2024-082","DOIUrl":"10.4012/dmj.2024-082","url":null,"abstract":"<p><p>The purpose of this study was to develop a new instrument to measure the mechanical properties of rotary endodontic Ni-Ti files (ProTaper Gold F2, ProTaper Ultimate F2, and HyFlex EDM Onefile), and to evaluate the overall utility of the device. The instrument was capable of analyzing the 6-axis force/torque generated by the files during cyclic dynamic movement in a metal curved artificial root canal, and doing automatic cyclic dynamic filing in a resin root canal with a preset vertical force limit by adopting a negative feedback mechanism. By analyzing the 6-axis force/torque, we were able to estimate the position and contact points of the files in the curved root canal. ProTaper Gold showed the highest force/torque in all directions. HyFlex EDM had the highest hysteresis ratio, centering ratio value and NCF (number of cycles to fatigue fracture), while the lowest vertical force.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":" ","pages":"762-771"},"PeriodicalIF":1.9,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142364764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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