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Corrosion behavior of Zr-14Nb-5Ta-1Mo alloy in simulated body fluid. Zr-14Nb-5Ta-1Mo 合金在模拟体液中的腐蚀行为。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-09-21 DOI: 10.4012/dmj.2024-158
Tomoyo Manaka, Yusuke Tsutsumi, Maki Ashida, Peng Chen, Takao Hanawa
{"title":"Corrosion behavior of Zr-14Nb-5Ta-1Mo alloy in simulated body fluid.","authors":"Tomoyo Manaka, Yusuke Tsutsumi, Maki Ashida, Peng Chen, Takao Hanawa","doi":"10.4012/dmj.2024-158","DOIUrl":"https://doi.org/10.4012/dmj.2024-158","url":null,"abstract":"<p><p>Metals that are used to reconstruct skeletal structures often interfere with magnetic resonance imaging (MRI) owing to differences in magnetic susceptibility; consequently, metals with lower magnetic susceptibilities need to be developed for use in implant devices. Herein, we investigated the corrosion properties of the Zr-14Nb-5Ta-1Mo alloy, which exhibits low magnetic susceptibility and excellent mechanical properties. The pitting potential of Zr-14Nb-5Ta-1Mo was higher than that of pure Zr. The passive current density of Zr-14Nb-5Ta-1Mo also higher than that of pure Zr, which is ascribable to slow reconstruction of the initial passive film associated with the presence of Nb and Ta. XPS revealed that the passive film is enriched with Nb and Ta. Therefore, while the Zr-14Nb-5Ta-1Mo alloy exhibited a high initial passive current density in simulated body fluid, it formed a stable passive film that suppressed localized corrosion. Zr-14Nb-5Ta-1Mo is therefore a prospective implant-material alloy candidate.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142307346","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
Wear characteristics of resin-based luting agents used in the bonded CAD-CAM resin blocks. 粘接 CAD-CAM 树脂块中使用的树脂基胶结剂的磨损特性。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-09-21 DOI: 10.4012/dmj.2024-137
Hiroto Takenaka, Keiichi Yoshida, Takashi Sawase
{"title":"Wear characteristics of resin-based luting agents used in the bonded CAD-CAM resin blocks.","authors":"Hiroto Takenaka, Keiichi Yoshida, Takashi Sawase","doi":"10.4012/dmj.2024-137","DOIUrl":"https://doi.org/10.4012/dmj.2024-137","url":null,"abstract":"<p><p>This study aimed to investigate the wear and microhardness of luting agents and computer-aided design-computer-aided manufacturing (CAD-CAM) resin blocks, and to compare the wear characteristics of resin-based luting agents used in bonded specimens of CAD-CAM resin blocks. After three-body wear test, the amount of wear and Vickers hardness were measured and Pearson's correlation coefficient was calculated. The lowest amount of wear and the highest Vickers hardness values were obtained for Estecem II. Filler loss was observed in five composite resin cements. A strong negative correlation was observed in the luting agents between the amount of wear and Vickers hardness value (r=-0.874, p<0.0001). Additionally, a strong positive correlation was observed between the amount of wear of the bonded specimen and amount of luting agent used alone (r=0.943, p<0.0001). To conclude, the wear resistance of the luting agent used in the bonded specimen was significantly influenced by the bonding between the filler and matrix resin.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142307347","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
Five-year clinical follow-up of bulk-fill restorative materials in class II restorations. 第二类修复体中膨体填充修复材料的五年临床随访。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-09-10 DOI: 10.4012/dmj.2024-132
Merve Gürses, Bahar Inan, Nevin Cobanoglu, Atiye Tugba Kuzgun Türkmen
{"title":"Five-year clinical follow-up of bulk-fill restorative materials in class II restorations.","authors":"Merve Gürses, Bahar Inan, Nevin Cobanoglu, Atiye Tugba Kuzgun Türkmen","doi":"10.4012/dmj.2024-132","DOIUrl":"https://doi.org/10.4012/dmj.2024-132","url":null,"abstract":"<p><p>This study evaluates the 5-year clinical performance of Class II restorations performed with different bulk-fill restorative materials. In the study, Class II restorations performed with Tetric Bulk-Fill (TBF), Filtek Bulk-Fill (FBF), and Equia Forte Fil (EF) were evaluated. One hundred-nineteen restorations were included in the study. Restorations were assessed during the 6th month, 1st, 2nd, and 5th year. Cochran Q, Pearson chi-square, and Fisher-Freeman-Halton tests were used for statistical analysis. In the 5th year, significant differences were observed in terms of retention, color match, marginal adaptation, marginal discoloration, surface texture, and anatomical form in all materials. There was a significant difference between EF and bulk-fill composites only in terms of retention and anatomical form. EF was significantly less successful than bulk-fill composites with regard to retention and anatomical form, but bulk-fill composites have shown similar clinical performance. EF cannot be an alternative to bulk-fill composites for Class II restorations.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142281772","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
Chemical and physical properties of radiopaque Portland cement formulation with reduced particle size. 粒径减小的不透射线硅酸盐水泥配方的化学和物理特性。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-09-10 DOI: 10.4012/dmj.2024-015
Hoda Mohamed Elnawawy, Muralithran Govindan Kutty, Noor Azlin Yahya, Noor Hayaty Abu Kasim, Paul Roy Cooper, Josette Camilleri, Hany Mohamed Aly Ahmed
{"title":"Chemical and physical properties of radiopaque Portland cement formulation with reduced particle size.","authors":"Hoda Mohamed Elnawawy, Muralithran Govindan Kutty, Noor Azlin Yahya, Noor Hayaty Abu Kasim, Paul Roy Cooper, Josette Camilleri, Hany Mohamed Aly Ahmed","doi":"10.4012/dmj.2024-015","DOIUrl":"https://doi.org/10.4012/dmj.2024-015","url":null,"abstract":"<p><p>This study compared the chemical and physical properties of an experimental radiopaque white Portland cement (REPC) with reduced particle size to ProRoot white mineral trioxide aggregate (WMTA). The particle size distribution of experimental Portland cement (EPC) was examined, and then nano-zirconium oxide (nano-ZrO) was added to produce REPC. Chemical analysis, initial setting time, pH values, and push-out bond strength were evaluated. Results showed that REPC had smallest particle size (354.5±26.45 nm), while PC had the largest (1,309.67±60.54 nm) (p<0.05). Differences in chemical composition were observed. REPC exhibited shorter setting time (32.7±0.58 min) compared to WMTA (131.67±2.89 min) and PC (163.33±2.89 min) (p<0.05). All groups showed alkaline pH (p<0.05). REPC demonstrated the highest push-out bond strength (22.24±4.33 MPa) compared with WMTA (15.53±3.26 MPa) and PC (16.8±5.43 MPa) (p<0.05). This cost-effective PC formulation reduced the setting time and increased the push-out bond strength while maintaining the alkaline properties of the original cements.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142281771","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
Automatic point detection on cephalograms using convolutional neural networks: A two-step method. 使用卷积神经网络自动检测头颅图像上的点：两步法
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-09-04 DOI: 10.4012/dmj.2024-052
Miki Hori, Makoto Jincho, Tadasuke Hori, Hironao Sekine, Akiko Kato, Ken Miyazawa, Tatsushi Kawai
{"title":"Automatic point detection on cephalograms using convolutional neural networks: A two-step method.","authors":"Miki Hori, Makoto Jincho, Tadasuke Hori, Hironao Sekine, Akiko Kato, Ken Miyazawa, Tatsushi Kawai","doi":"10.4012/dmj.2024-052","DOIUrl":"https://doi.org/10.4012/dmj.2024-052","url":null,"abstract":"<p><p>This project aimed to develop an artificial intelligence program tailored for cephalometric images. The program employs a convolutional neural network with 6 convolutional layers and 2 affine layers. It identifies 18 key points on the skull to compute various angles essential for diagnosis. Utilizing a custom-built desktop computer with a moderately priced graphics processing unit, cephalogram images were resized to 800×800 pixels. Training data comprised 833 images, augmented 100 times; an additional 179 images were used for testing. Due to the complexity of training with full-size images, training was divided into two steps. The first step reduced images to 128×128 pixels, recognizing all 18 points. In the second step, 100×100 pixels blocks were extracted from original images for individual point training. The program then measured six angles, achieving an average error of 3.1 pixels for the 18 points, with SNA and SNB angles showing an average difference of less than 1°.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142132094","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
Biocompatibility and pro-mineralization effects of premixed calcium silicate-based materials on human dental pulp stem cells: An in vitro and in vivo study. 预混合硅酸钙基材料对人牙髓干细胞的生物相容性和促矿化效应：体外和体内研究。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-09-03 DOI: 10.4012/dmj.2024-121
Nyein Chan Ko, Sonoko Noda, Yamato Okada, Kento Tazawa, Nobuyuki Kawashima, Takashi Okiji
{"title":"Biocompatibility and pro-mineralization effects of premixed calcium silicate-based materials on human dental pulp stem cells: An in vitro and in vivo study.","authors":"Nyein Chan Ko, Sonoko Noda, Yamato Okada, Kento Tazawa, Nobuyuki Kawashima, Takashi Okiji","doi":"10.4012/dmj.2024-121","DOIUrl":"https://doi.org/10.4012/dmj.2024-121","url":null,"abstract":"<p><p>Premixed calcium silicate-based materials have recently been developed and are recommended for a wide range of endodontic procedures, including vital pulp therapy. This study investigated the in vitro biocompatibility and pro-mineralization effect and in vivo reparative dentin formation of EndoSequence Root Repair Material, EndoSequence BCRRM, Bio-C Repair, and Well-pulp PT. Both fresh and set extracts had no detrimental effect on the growth of human dental pulp stem cells. The fresh extracts had a higher calcium concentration than the set extracts and induced considerably greater mineralized nodule formation. EndoSequence Root Repair Material had the longest setting time, whereas Bio-C Repair had the shortest. When these materials were applied to exposed rat molar pulps, mineralized tissue deposition was found at the exposure sites after 2 weeks. These results indicate that the premixed calcium silicate-based materials tested could have positive benefits for direct pulp capping procedures.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142132095","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
Surface roughness associated with bacterial adhesion on dental resin-based materials. 牙科树脂基材料表面粗糙度与细菌粘附的关系
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-08-30 DOI: 10.4012/dmj.2023-234
Oskar Bunz, Max Diekamp, Mozhgan Bizhang, Holger Testrich, Andree Piwowarczyk
{"title":"Surface roughness associated with bacterial adhesion on dental resin-based materials.","authors":"Oskar Bunz, Max Diekamp, Mozhgan Bizhang, Holger Testrich, Andree Piwowarczyk","doi":"10.4012/dmj.2023-234","DOIUrl":"https://doi.org/10.4012/dmj.2023-234","url":null,"abstract":"<p><p>This study investigates the surface quality and bacterial adhesion properties of various dental materials, including indirect composites, veneering composites, direct composites, polyether ether ketone (PEEK), and two millable polymethyl methacrylate (PMMA). Material specimens were processed following manufacturer instructions, initially evaluated for surface roughness and Streptococcus sanguinis (S. sanguinis) adhesion. Subsequently, toothbrushing simulation was employed to simulate aging, and changes in material surfaces were assessed via roughness measurements and bacterial adhesion testing. Prior to simulated aging, direct and indirect composites exhibited the lowest roughness values. However, after the simulated toothbrushing, veneering composites displayed the highest roughness levels. Both PMMA materials demonstrated the highest S. sanguinis adhesion levels, both before and after artificial aging. Interestingly, the indirect composite material showed a reduction in bacterial adhesion following toothbrushing simulation. Surprisingly, this study did not reveal a clear correlation between roughness and bacterial adhesion.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142105156","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
Changes in the surface texture of pre-polymerized acrylic resin pediatric crowns following acidulated phosphate fluoride application. 预聚合丙烯酸树脂儿科牙冠在使用酸性磷酸盐氟化物后表面纹理的变化。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-08-30 DOI: 10.4012/dmj.2024-083
Keiya Nanri, Hiroyasu Koizumi, Haruto Hiraba, Takashi Kikuiri, Takayuki Yoneyama
{"title":"Changes in the surface texture of pre-polymerized acrylic resin pediatric crowns following acidulated phosphate fluoride application.","authors":"Keiya Nanri, Hiroyasu Koizumi, Haruto Hiraba, Takashi Kikuiri, Takayuki Yoneyama","doi":"10.4012/dmj.2024-083","DOIUrl":"https://doi.org/10.4012/dmj.2024-083","url":null,"abstract":"<p><p>This study aimed to investigate the effect of acidulated phosphate fluoride (APF) application on filler-free polymethyl methacrylate (PMMA)-based resin blocks for computer-aided design/computer-aided manufacturing (CAD-CAM), focusing on their use in pediatric crowns. Three types of PMMA-based blocks for CAD-CAM were evaluated, and a composite resin block for CAD-CAM was used as a control. Statistical analysis (p<0.05) of the data revealed that all PMMA-based blocks showed significantly higher gloss levels than the composite resin blocks. Two PMMA-based blocks also demonstrated significantly lower Ra and Sa values. SEM images showed no irregular changes in the surface properties of the PMMA-based blocks compared to those of the composite resin block. These results are significant in meeting the increasing demand for esthetic restorative treatments in pediatrics, where APF is commonly used for caries prevention. PMMA-based resin blocks for CAD-CAM are an effective alternative to prevent esthetic degradation from gloss reduction and plaque accumulation.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142105139","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
Collagen-binding bone morphogenetic protein-2 designed for use in bone tissue engineering. 胶原结合型骨形态发生蛋白-2，设计用于骨组织工程。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-08-30 DOI: 10.4012/dmj.2024-138
Karina Erda Saninggar, Fumika Abe, Ayana Nakano, Koichi Kato
{"title":"Collagen-binding bone morphogenetic protein-2 designed for use in bone tissue engineering.","authors":"Karina Erda Saninggar, Fumika Abe, Ayana Nakano, Koichi Kato","doi":"10.4012/dmj.2024-138","DOIUrl":"https://doi.org/10.4012/dmj.2024-138","url":null,"abstract":"<p><p>Bone tissue engineering using biodegradable porous scaffolds is a promising approach for restoring oral and maxillofacial bone defects. Recently, attempts have been made to incorporate proteins such as growth factors to create bioactive scaffolds that can engage cells to promote tissue formation. Collagen-based scaffolds containing bone morphogenetic protein-2 (BMP2) have been studied for bone formation. However, controlling the initial burst of BMP2 remains difficult. Here we designed a functional chimeric protein composed of BMP2 and a collagen-binding domain (CBD), specifically the A3 domain of von Willebrand factor, to sustain BMP2 release from collagen-based scaffolds. Based on the results of computer-based structural prediction, we prepared a chimeric protein consisting of CBD and BMP2 in this order with a peptide tag for affinity purification. The chimeric protein had a collagen-binding capacity and enhanced osteogenic differentiation of human mesenchymal stem cells. These results are consistent with insights from in silico structural prediction.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142105155","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
Fabrication of strontium ions substituted hydroxyapatite from the shells of the golden apple snail (Pomacea canaliculate L) with enhanced osteoconductive and improved biological properties. 利用金苹果蜗牛（Pomacea canaliculate L）壳制造锶离子替代羟基磷灰石，增强骨传导性并改善生物特性。
IF 1.9 4区 医学
Dental materials journal Pub Date : 2024-08-28 DOI: 10.4012/dmj.2023-246
Widowati Siswomihardjo, Ika Dewi Ana, Retno Ardhani
{"title":"Fabrication of strontium ions substituted hydroxyapatite from the shells of the golden apple snail (Pomacea canaliculate L) with enhanced osteoconductive and improved biological properties.","authors":"Widowati Siswomihardjo, Ika Dewi Ana, Retno Ardhani","doi":"10.4012/dmj.2023-246","DOIUrl":"https://doi.org/10.4012/dmj.2023-246","url":null,"abstract":"<p><p>The use of biogenic calcium ions for the source of hydroxyapatite (HAp or HA) are very common and have been being explored extensively. However, it usually results high crystalline HA, due to high reaction and decomposition temperatures. In this study, strontium (Sr<sup>2+</sup>) doped HA from the golden apple snail shells (Pomacea canaliculate L) was successfully synthesized. It was indicated that Sr ions completely replaced calcium (Ca) ions, increased the lattice constant, and consecutively reduced HA crystallinity. Smaller crystal size and β-type carbonate (CO<sub>3</sub><sup>2-</sup>) ions substitution with Ca/P close to 1.67 molar ratio that mimic bone crystals were observed in Sr-doped HA, with significant increased rate of MC3T3-E1 cells viability and higher IC<sub>50</sub> values. It was proven that Sr ions substitution resolved challenges on the use of biogenic sources for HA fabrication. Further in vivo study is needed to continue to valorise the results into real biomedical and clinical applications.</p>","PeriodicalId":11065,"journal":{"name":"Dental materials journal","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142092517","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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