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Enhanced anti-bacterial adhesion effect of FDMA/SR833s based dental resin composites by using 1H,1H-heptafluorobutyl methacrylate as partial diluent 使用 1H,1H-七氟丁基甲基丙烯酸酯作为部分稀释剂增强基于 FDMA/SR833s 的牙科树脂复合材料的抗菌粘附效果
Pub Date : 2023-11-18 DOI: 10.1080/26415275.2023.2281090
Shengcan Zhang, Fang Liu, Jingwei He
Abstract With the purpose of further reducing surface free energy to achieve better anti-bacterial adhesion effect of fluorinated dimethacrylate (FDMA)/tricyclo (5.2.1.0) decanedimethanol diacrylate (SR833s) based dental resin composites (DS), 1H,1H-heptafluorobutyl methacrylate (FBMA) was used to partially replace SR933s as reactive diluent. According to the degree of substitution, the obtained resin composites were marked as DSF-1 (20 wt.% of SR833s was replaced by FBMA), DSF-2 (40 wt.% of SR833s was replaced by FBMA), and DSF-3 (60 wt.% of SR833s was replaced by FBMA). Bisphenol A glycidyl dimethacrylate (Bis-GMA)/triethylene glycol dimethacrylate (TEGDMA) based resin composite (BT) was used as control. The influence of FBMA concentration on double bond conversion (DC), contact angle, surface free energy, anti-bacterial adhesion effect against Streptococcus mutans (S. mutans), volumetric shrinkage (VS) and shrinkage stress (SS), flexural strength (FS) and modulus (FM), water sorption (WS) and solubility (SL) were investigated. The results showed that FBMA addition could reduce surface free energy from 44.6 mN/m for DS to 32.9 mN/m for DSF-3, and lead to better anti-bacterial adhesion effect (the amounts of adherent bacteria decreased from 2.03 × 105 CFU/mm2 for DS to 6.44 × 104 CFU/mm2 for DSF-3). The FBMA had no negative effects on DC, VS, SS, WS, and SL. Too high a concentration of FBMA reduced FS and FM before water immersion, but the values were still higher than those of BT.
摘要 为了进一步降低氟化二甲基丙烯酸酯(FDMA)/三环(5.2.1.0)癸烷二甲醇二丙烯酸酯(SR833s)牙科树脂复合材料(DS)的表面自由能,使其达到更好的抗菌粘附效果,采用1H,1H-七氟丁基甲基丙烯酸酯(FBMA)部分取代SR933s作为反应性稀释剂。根据替代程度,得到的树脂复合材料被标记为 DSF-1(20 wt.% 的 SR833s 被 FBMA 替代)、DSF-2(40 wt.% 的 SR833s 被 FBMA 替代)和 DSF-3(60 wt.% 的 SR833s 被 FBMA 替代)。以双酚 A 缩水甘油基二甲基丙烯酸酯(Bis-GMA)/三乙二醇二甲基丙烯酸酯(TEGDMA)为基础的树脂复合材料(BT)作为对照。研究了 FBMA 浓度对双键转化率(DC)、接触角、表面自由能、对变异链球菌(S. mutans)的抗菌粘附效果、体积收缩率(VS)和收缩应力(SS)、抗弯强度(FS)和模量(FM)、吸水性(WS)和溶解度(SL)的影响。结果表明,添加 FBMA 可降低表面自由能,从 DS 的 44.6 mN/m 降至 DSF-3 的 32.9 mN/m,并带来更好的抗菌粘附效果(粘附细菌数量从 DS 的 2.03 × 105 CFU/mm2 降至 DSF-3 的 6.44 × 104 CFU/mm2)。FBMA 对 DC、VS、SS、WS 和 SL 没有负面影响。过高浓度的 FBMA 会降低浸水前的 FS 和 FM,但其值仍高于 BT。
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引用次数: 0
Evaluating the use of self-conditioning adhesive combined with dual curing resin cement as an endodontic sealer: An in vitro study. 评估自调节粘合剂与双固化树脂粘结剂结合作为牙髓密封剂的使用情况:体外研究
Pub Date : 2023-11-18 DOI: 10.1080/26415275.2023.2282523
C. I. Anton y Otero, Nicolas Liaudet, E. di Bella, M. Abdelaziz, A. Feilzer, I. Krejci, L. Marger
Abstract Objectives To compare infiltration, sealing and microleakage in root dentin with a self-conditioning adhesive system combined with dual curing resin (resin-based cement) to a conventional epoxy-resin-based sealer using confocal microscopy imaging. Methods 26 roots were enlarged and disinfected. Dentin tubules of 24 teeth were labelled with a red fluorophore (Rhodamine B) (two samples served as controls). Root canal samples were sealed in group AH (n = 11) with a conventional sealer (AH Plus Root Canal Sealer, Dentsply DeTrey) and in group RC (n = 11) with a resin-based cement (Parabond combined with Paracore, Coltène). Roots were then sectioned horizontally and immersed in H2O2 to remove the Rhodamine B not fixed by the sealers. The empty dentin spaces were labeled with a green fluorophore (Fluorescein) enabling the evaluation of infiltration as well as microleakage by confocal microscopy. Two additional samples were fractured in vertical direction for observation under SEM. Results Group RC presented significantly more infiltration in the middle third than in the middle and apical thirds of group AH. Microleakage was significantly higher in group AH than in group RC. SEM images revealed more dentin plugs and a homogenous resin layer in group RC in contrast to group AH. Conclusion The resin-based cement revealed promising outcomes compared to a traditional epoxy resin based sealer. Key messages Infiltration and microleakage in infiltrated and sealed root dentin samples are higher in middle than apical root thirds. Root dentin infiltration and sealing with a self-conditioning adhesive system and a dual-curing resin cement revealed less microleakage than with an epoxy-resin-based sealer.
摘要 目的 使用共聚焦显微镜成像技术,比较自调理粘合剂系统结合双固化树脂(树脂基水泥)与传统环氧树脂基封固剂在根部牙本质中的浸润、封闭和微渗漏情况。方法 对 26 个牙根进行放大和消毒。用红色荧光团(罗丹明 B)标记 24 颗牙齿的牙本质小管(两个样本作为对照组)。根管样本在 AH 组(n = 11)中使用传统封闭剂(AH Plus 根管封闭剂,Dentsply DeTrey 公司)进行封闭,在 RC 组(n = 11)中使用树脂粘结剂(Parabond 与 Paracore 结合使用,Coltène 公司)进行封闭。然后将牙根水平切片并浸泡在 H2O2 中,以去除未被封闭剂固定的罗丹明 B。用绿色荧光团(荧光素)标记空的牙本质空隙,以便通过共聚焦显微镜评估渗透和微渗漏情况。另外两个样本被垂直折断,以便在扫描电镜下观察。结果 RC 组中间三分之一处的浸润明显多于 AH 组中间和顶端三分之一处的浸润。AH 组的微渗漏率明显高于 RC 组。扫描电子显微镜图像显示,与 AH 组相比,RC 组的牙本质栓更多,树脂层更均匀。结论 与传统的环氧树脂封闭剂相比,树脂封闭剂具有良好的效果。关键信息 根部牙本质浸润和密封样本中的浸润和微渗漏在根中部高于根尖三分之一处。与使用环氧树脂封闭剂相比,使用自调节粘接剂系统和双固化树脂粘接剂进行根牙本质浸润和封闭时,微渗漏较少。
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引用次数: 0
The influence of pre-heating the restoration and luting agent on the flexural strength of indirect ceramic and composite restorations 预热修复体和衬垫剂对间接陶瓷和复合材料修复体抗弯强度的影响
Pub Date : 2023-11-16 DOI: 10.1080/26415275.2023.2279066
João Paulo Mendes Tribst, Lilis Etoeharnowo, Maril Tadros, A. Feilzer, Arie Werner, C. Kleverlaan, A. D. Dal Piva
Abstract Background This study investigated the impact of luting procedure and restoration thicknesses on the flexural strength of CAD/CAM restorations. Traditional luting agents have been questioned in favor of pre-heated resin composites or flowable composites. Materials and Methods 400 disc-shaped restorations (lithium disilicate [IPS e.max CAD] or resin composite [Tetric CAD, Ivoclar]) were cemented onto dentin analog discs using different procedures (n = 20): dual-curing resin cement (Panavia V5), light-curing resin cement (Panavia Veneer LC), pre-heated resin composite (Clearfil™ AP-X) with or without pre-heated restoration, and high-filled flowable composite (Clearfil Majesty™ Flow). The biaxial flexural strength was calculated. Results There were significant effects of material, thickness, and luting procedure on flexural strength (p < 0.001). Resin composite specimens exhibited lower flexural strength (90 MPa) compared to lithium disilicate specimens (571 MPa), with thicker restorations (338 MPa) being stronger than thinner ones (323 MPa). Light-curing cement showed the highest strength (408.8 MPa)A, followed by dual-curing cement (362 MPa)B, pre-heated cement with pre-heated composite (318 MPa)C, pre-heated composite (304 MPa)C, and flowable resin composite (259 MPa)D. The light-curing cement yielded similar results to the pre-heated resin composite associated or not with the pre-heated crown for the thicker lithium disilicate specimens, whereas for the thinner lithium disilicate specimens all luting procedures performed similarly. Thin resin composite discs showed higher flexural strength when luted with light-curing cement, whereas the luting procedure had less influence for the thicker restorations. Conclusion Luting procedures impact the flexural strength of CAD/CAM lithium disilicate and resin composite restorations. Pre-heated resin composite, with or without pre-heated restoration, can replace dual-curing cement. Nevertheless, light-curing cement is superior for resin composite and 1.5 mm lithium disilicate restorations. Key-messages Different luting procedures significantly impact the flexural strength of CAD/CAM lithium disilicate and resin composite restorations, with light-curing cement demonstrating superior performance for specific thicknesses. Pre-heated resin composites, either with or without pre-heated restorations, offer a viable alternative to conventional dual-curing cement for bonding indirect restorations, presenting potential clinical advantages. Restoration thickness plays a crucial role in the mechanical response of restorations, with thinner resin composite restorations benefiting from dual- or light-curing, while thicker ones are less sensitive to luting procedure variations.
摘要 背景 本研究调查了上胶程序和修复体厚度对 CAD/CAM 修复体抗弯强度的影响。传统的粘结剂已受到质疑,而预热树脂复合材料或可流动复合材料则更受青睐。材料和方法 使用不同的程序(n = 20)将 400 个盘状修复体(二硅酸锂[IPS e.max CAD]或树脂复合材料[Tetric CAD, Ivoclar])粘结到牙本质模拟盘上:双固化树脂粘结剂(Panavia V5)、光固化树脂粘结剂(Panavia Veneer LC)、带或不带预热修复体的预热树脂复合材料(Clearfil™ AP-X)以及高填充可流动复合材料(Clearfil Majesty™ Flow)。计算了双轴抗弯强度。结果 材料、厚度和上胶程序对抗弯强度有明显影响(p < 0.001)。树脂复合材料试样的抗弯强度(90 兆帕)低于二硅酸锂试样(571 兆帕),较厚的修复体(338 兆帕)强于较薄的修复体(323 兆帕)。光固化水门汀的强度最高(408.8 兆帕)A,其次是双固化水门汀(362 兆帕)B、带预热复合材料的预热水门汀(318 兆帕)C、预热复合材料(304 兆帕)C 和可流动树脂复合材料(259 兆帕)D。对于较厚的二硅酸锂试样,光固化水泥与预热树脂复合材料的结果相似,而对于较薄的二硅酸锂试样,所有砌合程序的结果都相似。当使用光固化粘接剂粘结时,薄树脂复合片显示出更高的抗弯强度,而粘结程序对厚修复体的影响较小。结论 光固化程序会影响 CAD/CAM 二硅酸锂和树脂复合材料修复体的抗折强度。预热或不预热的树脂复合修复体可以替代双固化水门汀。尽管如此,光固化水门汀对于树脂复合材料和1.5毫米二硅酸锂修复体还是更有优势。关键信息 不同的粘结程序对 CAD/CAM 二硅酸锂和树脂复合材料修复体的抗弯强度有很大影响,光固化粘结剂在特定厚度的修复体中表现出更优越的性能。预热或不预热修复体的预热树脂复合材料为粘结间接修复体提供了传统双固化粘结剂的可行替代方案,具有潜在的临床优势。修复体的厚度对修复体的机械反应起着至关重要的作用,较薄的树脂复合材料修复体可从双固化或光固化中获益,而较厚的修复体则对粘结程序的变化不太敏感。
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引用次数: 0
Influence of abrasive dentifrices on polymeric reconstructive material properties after simulated toothbrushing 模拟刷牙后磨料对聚合物重建材料性能的影响
Pub Date : 2023-11-07 DOI: 10.1080/26415275.2023.2268670
Laura Firmo Carvalho, Larissa Marcia Martins Alves, Edmara T. P. Bergamo, Ernesto Byron Benalcazar Jalkh, Tiago Moreira Bastos Campos, Abbas Zahoui, Elisa de Souza Fermino, Ana Carolina Magalhães, Thelma Lopes Silva, Paulo G. Coelho, Estevam A. Bonfante
To assess the influence of dentifrices with different abrasiveness levels on the properties of dental reconstructive materials. Forty-eight cylinders were obtained from four polymeric materials, being two CAD/CAM acrylic resins (Ivotion-Dent and Ivotion-Base), one injected acrylic resin (IvoBase-Hydrid) and one light-cured resin composite (Empress Direct). Specimens were allocated to four subgroups for toothbrushing simulation according to the dentifrice relative dentin abrasivity (RDA) and silica content: (i) RDA 0 = 0%; (ii) RDA 50 = 3%; (iii) RDA 100 = 10%; and (iv) RDA 120 = 25%. Specimens were then subjected to toothbrushing. Surface analyses [surface roughness Ra (SR) and scanning electron microscopy (SEM)] along with hardness and optical properties [translucency parameter (TP) and contrast ratio (CR)] were evaluated before and after toothbrushing. Statistical analyses were performed using ANOVA and Tukey test. A significant increase in SR was observed after toothbrushing with higher RDA toothpastes for Ivotion-Dent (100 and 120) and IvoBase-Hybrid (120). Ivotion-Base and Empress Direct presented no significant differences in SR when analyzed as a function of timepoint and RDA levels. Hardness was not influenced by toothbrushing with different RDA dentifrices, except for Empress Direct with RDA 0 toothpaste, where a decrease in the hardness was observed. TP of Ivotion-Dent and Empress Direct significantly decreased after toothbrushing with higher RDA dentifrices and CR of Ivotion-Dent, Empress Direct and IvoBase-Hybrid significantly increased with higher RDA dentifrices. The levels of dentifrice abrasiveness affected differently the SR, hardness and optical properties of polymeric reconstructive materials after toothbrushing.
目的探讨不同磨耗程度的牙体对牙体重建材料性能的影响。从四种聚合物材料中获得48个圆柱体,包括两种CAD/CAM丙烯酸树脂(Ivotion-Dent和Ivotion-Base),一种注射丙烯酸树脂(IvoBase-Hydrid)和一种光固化复合树脂(Empress Direct)。根据牙本质相对磨耗度(RDA)和二氧化硅含量将标本分为4个亚组进行模拟刷牙实验:(i) RDA 0 = 0%;(ii) RDA 50 = 3%;(iii) RDA 100 = 10%;(iv) RDA 120 = 25%。然后对标本进行刷牙。在刷牙前后评估表面分析[表面粗糙度Ra (SR)和扫描电子显微镜(SEM)]以及硬度和光学性能[半透明参数(TP)和对比度(CR)]。统计学分析采用方差分析和Tukey检验。使用RDA较高的ivvod - dent牙膏(100和120)和IvoBase-Hybrid牙膏(120)刷牙后,观察到SR显著增加。当分析作为时间点和RDA水平的函数时,vote - base和Empress Direct的SR没有显着差异。除了使用RDA为0的女皇牙膏外,使用不同RDA牙膏对硬度没有影响。高RDA牙量刷牙后,Ivotion-Dent和Empress Direct的TP显著降低,而高RDA牙量刷牙后,Ivotion-Dent、Empress Direct和IvoBase-Hybrid的CR显著升高。牙釉质磨损程度对聚合物重建材料刷牙后的SR、硬度和光学性能有不同的影响。
{"title":"Influence of abrasive dentifrices on polymeric reconstructive material properties after simulated toothbrushing","authors":"Laura Firmo Carvalho, Larissa Marcia Martins Alves, Edmara T. P. Bergamo, Ernesto Byron Benalcazar Jalkh, Tiago Moreira Bastos Campos, Abbas Zahoui, Elisa de Souza Fermino, Ana Carolina Magalhães, Thelma Lopes Silva, Paulo G. Coelho, Estevam A. Bonfante","doi":"10.1080/26415275.2023.2268670","DOIUrl":"https://doi.org/10.1080/26415275.2023.2268670","url":null,"abstract":"To assess the influence of dentifrices with different abrasiveness levels on the properties of dental reconstructive materials. Forty-eight cylinders were obtained from four polymeric materials, being two CAD/CAM acrylic resins (Ivotion-Dent and Ivotion-Base), one injected acrylic resin (IvoBase-Hydrid) and one light-cured resin composite (Empress Direct). Specimens were allocated to four subgroups for toothbrushing simulation according to the dentifrice relative dentin abrasivity (RDA) and silica content: (i) RDA 0 = 0%; (ii) RDA 50 = 3%; (iii) RDA 100 = 10%; and (iv) RDA 120 = 25%. Specimens were then subjected to toothbrushing. Surface analyses [surface roughness Ra (SR) and scanning electron microscopy (SEM)] along with hardness and optical properties [translucency parameter (TP) and contrast ratio (CR)] were evaluated before and after toothbrushing. Statistical analyses were performed using ANOVA and Tukey test. A significant increase in SR was observed after toothbrushing with higher RDA toothpastes for Ivotion-Dent (100 and 120) and IvoBase-Hybrid (120). Ivotion-Base and Empress Direct presented no significant differences in SR when analyzed as a function of timepoint and RDA levels. Hardness was not influenced by toothbrushing with different RDA dentifrices, except for Empress Direct with RDA 0 toothpaste, where a decrease in the hardness was observed. TP of Ivotion-Dent and Empress Direct significantly decreased after toothbrushing with higher RDA dentifrices and CR of Ivotion-Dent, Empress Direct and IvoBase-Hybrid significantly increased with higher RDA dentifrices. The levels of dentifrice abrasiveness affected differently the SR, hardness and optical properties of polymeric reconstructive materials after toothbrushing.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"222 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135476522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanical and antibacterial properties of conventional pit and fissure sealants with addition of miswak fibers 添加miswak纤维的常规坑缝密封胶的机械性能和抗菌性能
Pub Date : 2023-10-30 DOI: 10.1080/26415275.2023.2271972
Mohammad Adnan Khan, Nawshad Muhammad, Saad Liaqat, Munazzah Ejaz, Sarmad Fayyaz, Hoor Ali, Taj Ali Khan
The occlusal surface of a tooth is affected by the development of biofilm in pits and fissures as bacteria and food particles accumulate in its complex structure. In this study, miswak fibers containing cellulose and antimicrobial extract were incorporated in commercial pit and fissure sealants. The miswak powder was characterized by different analytical techniques. The powder was mixed in different ratios (0–5%) into a pit and fissure sealant to result in five sealants (Groups 0–5), and their mechanical properties i.e. flexural strength, compressive strength, and Vickers hardness were evaluated. The sealants were also evaluated against streptococcus mutans oral pathogenic bacteria. SEM analysis confirmed irregular shape and micron-size particles of miswak powder. The infrared spectral analysis and X-ray differential peaks showed characteristic peaks related to miswak fibers. The particle appearance increased in prepared pits and fissure sealants with higher loading of miswak powder in SEM analysis. The flexural strength, compressive strength, and Vickers hardness values were obtained in the range of 148–221 (±16.6: p-value < 0.001) MPa, 43.1–50.3 MPa (±1.7: p-value <0.001), and 15.2–21.26 VHN (±0.56: p-value <0.001) for control and prepared sealant specimens respectively. In the antibacterial study, the zone of inhibitions increased with increased content of miswak from 15.6 ± 0.45 mm (Group 1) to 20.3 ± 0.32 mm (Group 5). The MIC was calculated to be 0.039%. The prepared experimental sealant had acceptable mechanical and good antibacterial properties therefore it could be recommended as an efficient pit and fissure sealant.
由于细菌和食物颗粒在牙槽和牙缝的复杂结构中积累,生物膜的发育会影响牙齿的咬合表面。在这项研究中,含有纤维素和抗菌提取物的miswak纤维被掺入商业坑和裂缝密封剂中。采用不同的分析方法对其进行了表征。将粉末按不同比例(0-5%)混合到坑缝密封胶中,得到5种密封胶(0-5组),并评估其力学性能,即抗弯强度、抗压强度和维氏硬度。还对该密封剂对口腔致病菌变形链球菌的作用进行了评价。SEM分析证实了miswak粉末的形状不规则,颗粒大小为微米级。红外光谱分析和x射线差谱峰显示了与误移光纤有关的特征峰。SEM分析表明,随着miswak粉的添加量的增加,所制备的凹坑和裂隙密封胶的颗粒形貌有所增加。对照和制备的密封胶试件的抗折强度、抗压强度和维氏硬度值分别为148 ~ 221 MPa(±16.6:p值<0.001)、43.1 ~ 50.3 MPa(±1.7:p值<0.001)和15.2 ~ 21.26 VHN(±0.56:p值<0.001)。抑菌研究中,随着miswak含量的增加,抑制区从15.6±0.45 mm(第1组)增加到20.3±0.32 mm(第5组),MIC为0.039%。所制备的实验密封胶具有良好的力学性能和良好的抗菌性能,可作为一种高效的坑缝密封胶推荐使用。
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引用次数: 0
Comparison of smear layer removing efficacy of Cold Atmospheric Pressure (CAP) Plasma Jet with different chelating agents. An ex-vivo study 不同螯合剂对冷常压等离子体射流除污效果的影响。离体研究
Pub Date : 2023-10-30 DOI: 10.1080/26415275.2023.2271929
Ankita Kapoor, Pravin Kumar, Ram Prakash, Kirti Chaudhry, Rajat Sharma, Arun Kumar Duraisamy
The present study aimed to assess the effectiveness of different final irrigation regimens (Cold Atmospheric Pressure Plasma Jet, MTAD, and EDTA) in removing the smear layer from intra-radicular dentin using a Scanning Electron Microscope (SEM). Eighty-four mandibular premolars were prepared with ProTaper Universal hand files and were equally divided into four groups i.e. Normal saline (control), EDTA, MTAD and CAP Plasma Jet. Prepared samples in the control, EDTA and MTAD groups were irrigated with 5 milliliters of the irrigant, and it was retained for 2 min. In the CAP Plasma Jet group, the plasma plume was directed towards the canal lumen for 2 min. The smear layer removal of all the groups was evaluated at the coronal, middle and apical thirds. Statistical analysis was performed using Kruskal–Wallis test followed by Dunn’s test. Evaluation by SEM showed that the smear layer removal ability of MTAD and EDTA were significantly better than CAP Plasma Jet (p < 0.05). While CAP Plasma Jet showed results comparable to EDTA in the coronal third. In the middle and apical third of the canal, its effect was comparable to the control group (p > 0.05). MTAD and EDTA aided in better smear layer removal than the CAP Plasma Jet in the coronal, middle, and apical third of the test samples. CAP Plasma jet performed better in the coronal third.
本研究旨在通过扫描电子显微镜(SEM)评估不同最终冲洗方案(冷大气压等离子体喷射、MTAD和EDTA)去除根状牙本质内涂抹层的有效性。采用ProTaper通用手锉制备84颗下颌前磨牙,随机分为生理盐水组(对照组)、EDTA组、MTAD组和CAP等离子体喷射组。对照组、EDTA组和MTAD组制备的样品用5毫升冲洗液冲洗,并保留2分钟。CAP等离子体喷射组将等离子体羽流指向管腔2分钟。评估各组在冠状、中端和根尖三分之一处的涂片层去除情况。采用Kruskal-Wallis检验和Dunn检验进行统计分析。SEM评价表明,MTAD和EDTA的去除涂抹层能力显著优于CAP等离子体射流(p < 0.05)。而CAP等离子体喷射在冠状三分之一的结果与EDTA相当。在根管中部和根尖三分之一处,其效果与对照组相当(p > 0.05)。与CAP等离子体射流相比,MTAD和EDTA在冠状、中间和根尖三分之一的测试样品中有助于更好地去除涂抹层。等离子体射流在冠状区表现较好。
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引用次数: 0
An in vitro assessment of biaxial flexural strength, degree of monomer conversion, color stability, and ion release in provisional restorations containing Sr-bioactive glass nanoparticles 含锶生物活性玻璃纳米颗粒临时修复体的双轴弯曲强度、单体转化程度、颜色稳定性和离子释放的体外评估
Pub Date : 2023-10-14 DOI: 10.1080/26415275.2023.2265393
Chawal Padunglappisit, Napassorn Suwanprateep, Harit Chaiwerawattana, Parichart Naruphontjirakul, Piyaphong Panpisut
This study examined the mechanical and chemical properties of an experimental provisional restoration containing Sr-bioactive glass nanoparticles (Sr-BGNPs) compared to commercial provisional materials. The experimental material (TempS10) contained dimethacrylate monomers with added 10 wt% Sr-BGNPs. The degree of monomer conversion (DC) of self-curing (n = 5), biaxial flexural strength (BFS)/modulus (BFM) (n = 5), and color changes (ΔE*00) of materials in red wine (n = 5) were determined. Additionally, ion release (Ca, P, and Sr) in water at 2 weeks was examined (n = 3). The commercial materials tested included polymethyl methacrylate-based provisional material (Unifast) and bis-acrylic materials (Protemp4 and Cooltemp). TempS10 exhibited a comparable degree of monomer conversion (49%) to that of Protemp4 (60%) and Cooltemp (54%) (p > 0.05). The DC of Unifast (81%) was significantly higher than that of other materials (p < 0.05). TempS10 showed a BFS (126 MPa) similar to Cooltemp (102 MPa) and Unifast (123 MPa), but lower than Protemp4 (194 MPa). The immersion time for 2 weeks exhibited no detrimental effect on the strength and modulus of all materials. The highest ΔE*00 at 24 h and 2 weeks was observed with TempS10, followed by Cooltemp, Unifast, and Protemp4. Only TempS10 showed a detectable amount of Ca (0.69 ppm), P (0.12 ppm), and Sr (3.01 ppm). The experimental provisional resin restoration containing Sr-BGNPs demonstrated polymerization and strength comparable to those of bis-acryl provisional restorations but with the added benefit of ion-releasing properties. However, the experimental material demonstrated unsatisfactory color stability.
本研究比较了含sr -生物活性玻璃纳米粒子(Sr-BGNPs)的实验性临时修复材料与商业临时材料的机械和化学特性。实验材料(TempS10)含有二甲丙烯酸酯单体,添加了10%的Sr-BGNPs。测定了材料在红酒(n = 5)中的自固化单体转化率(DC)、双轴抗弯强度(BFS)/模量(BFM) (n = 5)和颜色变化(ΔE*00)。此外,还检测了2周后水中离子释放(Ca, P和Sr) (n = 3)。测试的商业材料包括基于聚甲基丙烯酸甲酯的临时材料(Unifast)和双丙烯酸材料(Protemp4和Cooltemp)。TempS10的单体转化率(49%)与Protemp4(60%)和Cooltemp(54%)相当(p > 0.05)。Unifast的DC(81%)显著高于其他材料(p < 0.05)。TempS10的BFS值为126 MPa,与Cooltemp (102 MPa)和Unifast (123 MPa)相近,但低于Protemp4 (194 MPa)。浸泡时间为2周,对所有材料的强度和模量均无不利影响。TempS10在24 h和2周时的ΔE*00最高,其次是Cooltemp、Unifast和Protemp4。只有TempS10可以检测到Ca (0.69 ppm)、P (0.12 ppm)和Sr (3.01 ppm)。含有Sr-BGNPs的实验性临时树脂修复体显示出与双丙烯酸酯临时修复体相当的聚合和强度,但具有离子释放特性的额外好处。然而,实验材料表现出令人不满意的颜色稳定性。
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引用次数: 0
Comparison of dental flosses - an investigation of subjective preference and mechanical properties. 牙线的比较——主观偏好和机械性能的调查。
Pub Date : 2023-09-22 eCollection Date: 2023-01-01 DOI: 10.1080/26415275.2023.2258919
Zhongjin Huang, Jonathan M Broadbent, Joanne Jung Eun Choi

Objective: To investigate the properties (tensile strength, roughness, abrasiveness) of different dental flosses and how these properties relate to subjective preference for floss by users.

Materials and method: Four flosses of differing compositions were selected (polytetrafluoroethylene (PTFE), nylon, silk, and ultra-high-molecular-weight polyethylene (UHMWPE)). Tensile strength (TS) was measured utilising a universal testing machine (total n = 40). Surface roughness (Ra) was measured on 3D reconstructed models of scanning electron microscope and abrasiveness was measured through block-on-ring tests against human enamel. Subjective preference for floss was measured by asking a sample of 16 individuals to use each floss for an 8-day period using a split-mouth design.

Results: The highest TS was found in UHMWPE floss (194.18±24.61 MPa) while the lowest TS was found in PTFE floss (11.78±0.77 MPa). Silk floss had the highest Ra (0.304±0.025 µm) while PTFE floss had the lowest (0.048±0.003 µm). In-vitro abrasion testing of the flosses identified no significant differences between the flosses in causing wear on tooth enamel. Subjective ratings of flosses indicated PTFE floss to be most preferred and nylon floss to be least preferred.

Conclusion: There was a difference in subjective preference between dental flosses composed of different materials. The PTFE floss was the overall most preferred while the nylon floss was the least preferred. There was also an association between the mechanical properties and preference for their usage, with PTFE floss being the most preferred but having the lowest surface roughness and tensile strength.

Clinical relevance: This study compared a wide range of mechanical properties and subject preferences of commercially available dental floss. The results of this study can provide guidance for the recommendation of dental floss for oral hygiene routines.

目的:研究不同牙线的性能(抗拉强度、粗糙度、耐磨性),以及这些性能与使用者对牙线的主观偏好之间的关系。材料和方法:选择四种不同成分的浮丝(聚四氟乙烯(PTFE)、尼龙、丝绸和超高分子量聚乙烯(UHMWPE))。使用通用试验机测量抗拉强度(TS)(总n = 40)。在扫描电子显微镜的3D重建模型上测量表面粗糙度(Ra),并通过对人类牙釉质的块对环测试来测量磨损性。通过要求16个人的样本使用每种牙线8天,使用开口设计来测量对牙线的主观偏好。结果:超高分子量聚乙烯牙线TS最高(194.18±24.61) MPa),而PTFE牙线的TS最低(11.78±0.77 MPa)。丝线的Ra最高(0.304±0.025 µm),而PTFE牙线的含量最低(0.048±0.003 µm)。牙线的体外磨损测试表明,牙线在引起牙釉质磨损方面没有显著差异。牙线的主观评级表明PTFE牙线是最优选的,尼龙牙线是最低优选的。结论:不同材料的牙线在主观偏好上存在差异。PTFE牙线总体上是最优选的,而尼龙牙线是最不优选的。机械性能和对其使用的偏好之间也存在关联,PTFE牙线是最优选的,但具有最低的表面粗糙度和拉伸强度。临床相关性:本研究比较了商用牙线的广泛机械性能和受试者偏好。这项研究的结果可以为推荐牙线用于口腔卫生常规提供指导。
{"title":"Comparison of dental flosses - an investigation of subjective preference and mechanical properties.","authors":"Zhongjin Huang,&nbsp;Jonathan M Broadbent,&nbsp;Joanne Jung Eun Choi","doi":"10.1080/26415275.2023.2258919","DOIUrl":"10.1080/26415275.2023.2258919","url":null,"abstract":"<p><strong>Objective: </strong>To investigate the properties (tensile strength, roughness, abrasiveness) of different dental flosses and how these properties relate to subjective preference for floss by users.</p><p><strong>Materials and method: </strong>Four flosses of differing compositions were selected (polytetrafluoroethylene (PTFE), nylon, silk, and ultra-high-molecular-weight polyethylene (UHMWPE)). Tensile strength (TS) was measured utilising a universal testing machine (total <i>n</i> = 40). Surface roughness (Ra) was measured on 3D reconstructed models of scanning electron microscope and abrasiveness was measured through block-on-ring tests against human enamel. Subjective preference for floss was measured by asking a sample of 16 individuals to use each floss for an 8-day period using a split-mouth design.</p><p><strong>Results: </strong>The highest TS was found in UHMWPE floss (194.18<math><mo>±</mo></math>24.61 MPa) while the lowest TS was found in PTFE floss (11.78<math><mo>±</mo></math>0.77 MPa). Silk floss had the highest Ra (0.304<math><mo>±</mo></math>0.025 <i>µ</i>m) while PTFE floss had the lowest (0.048<math><mo>±</mo></math>0.003 <i>µ</i>m). In-vitro abrasion testing of the flosses identified no significant differences between the flosses in causing wear on tooth enamel. Subjective ratings of flosses indicated PTFE floss to be most preferred and nylon floss to be least preferred.</p><p><strong>Conclusion: </strong>There was a difference in subjective preference between dental flosses composed of different materials. The PTFE floss was the overall most preferred while the nylon floss was the least preferred. There was also an association between the mechanical properties and preference for their usage, with PTFE floss being the most preferred but having the lowest surface roughness and tensile strength.</p><p><strong>Clinical relevance: </strong>This study compared a wide range of mechanical properties and subject preferences of commercially available dental floss. The results of this study can provide guidance for the recommendation of dental floss for oral hygiene routines.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"10 1","pages":"2258919"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a7/33/IABO_10_2258919.PMC10519255.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41174975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Repair bond strength of bulk-fill composites: influence of different primers and direction of debonding stress. 本体填充复合材料的修复粘结强度:不同底漆和脱粘应力方向的影响。
Pub Date : 2023-09-22 eCollection Date: 2023-01-01 DOI: 10.1080/26415275.2023.2258924
Pekka Ahlholm, Frode Staxrud, Kirsi Sipilä, Pekka Vallittu

Background: The purpose of this in vitro study was to evaluate the effect of different adhesion primers on the repair bond strength of bulk-fill resin composite and short-term hydrolytic stability of the repair interface before and after accelerated aging. In addition, direction of debonding stress was examined.

Materials and methods: Bulk-fill substrates were aged in water for 14 days at 37 °C. Smooth resin composite surfaces were prepared for the substrates with a superfine grinding paper (FEPA #500, #1200, #2000). Test specimens were produced by attaching bulk-fill composite to the substrate surfaces, using three different primer/bonding systems. Specimens were aged 24 h at 37 °C in water, or thermal cycled (5-55 °C/5,000 cycles). Subsequently, shear bond strength and micro-tensile bond strength were evaluated. In total there were 60 specimens for the shear bond strength and 60 specimens for the micro-tensile bond strength measurements (30 stored in water 24 h, 30 thermal cycled, n = 10 in each primer/bonding mode).

Results: The mean shear bond strength was 9.1-13.1 MPa after 24 h water storage and 6.9-10.7 MPa after thermal cycling. The mean micro-tensile bond strength was 28.7-45.8 MPa after 24 h water storage and 22.7-37.9 MPa after thermal cycling.

Conclusion: The Ceramic primer (silane containing) seems to perform better than the three-step etch and rinse adhesive or the Composite primer. Shear-type stress had an adverse effect on the repair bond strength of bulk-fill resin composites.

背景:本体外研究的目的是评估不同粘附引物对本体填充树脂复合材料修复结合强度和加速老化前后修复界面短期水解稳定性的影响。此外,还研究了脱粘应力的方向。材料和方法:散装填充基底在水中老化14 第37天 °C。用超细砂纸(FEPA#500、#1200、#2000)为基材制备光滑的树脂复合材料表面。通过使用三种不同的底漆/粘合系统将大块填充复合材料附着到基底表面来制备试样。样本年龄为24岁 h在37 水中°C,或热循环(5-55 °C/5000次循环)。随后,对剪切结合强度和微观拉伸结合强度进行了评估。总共有60个剪切结合强度试样和60个微观拉伸结合强度测量试样(30个储存在水中24 h、 30热循环,n = 结果:平均剪切结合强度为9.1-13.1 24后MPa h蓄水量和6.9-10.7 热循环后的MPa。平均微观拉伸结合强度为28.7-45.8 24后MPa h蓄水量和22.7-37.9 热循环后的MPa。结论:陶瓷底漆(含硅烷)的性能优于三步蚀刻漂洗胶或复合底漆。剪切型应力对本体填充树脂复合材料的修复粘结强度有不利影响。
{"title":"Repair bond strength of bulk-fill composites: influence of different primers and direction of debonding stress.","authors":"Pekka Ahlholm,&nbsp;Frode Staxrud,&nbsp;Kirsi Sipilä,&nbsp;Pekka Vallittu","doi":"10.1080/26415275.2023.2258924","DOIUrl":"10.1080/26415275.2023.2258924","url":null,"abstract":"<p><strong>Background: </strong>The purpose of this <i>in vitro</i> study was to evaluate the effect of different adhesion primers on the repair bond strength of bulk-fill resin composite and short-term hydrolytic stability of the repair interface before and after accelerated aging. In addition, direction of debonding stress was examined.</p><p><strong>Materials and methods: </strong>Bulk-fill substrates were aged in water for 14 days at 37 °C. Smooth resin composite surfaces were prepared for the substrates with a superfine grinding paper (FEPA #500, #1200, #2000). Test specimens were produced by attaching bulk-fill composite to the substrate surfaces, using three different primer/bonding systems. Specimens were aged 24 h at 37 °C in water, or thermal cycled (5-55 °C/5,000 cycles). Subsequently, shear bond strength and micro-tensile bond strength were evaluated. In total there were 60 specimens for the shear bond strength and 60 specimens for the micro-tensile bond strength measurements (30 stored in water 24 h, 30 thermal cycled, <i>n</i> = 10 in each primer/bonding mode).</p><p><strong>Results: </strong>The mean shear bond strength was 9.1-13.1 MPa after 24 h water storage and 6.9-10.7 MPa after thermal cycling. The mean micro-tensile bond strength was 28.7-45.8 MPa after 24 h water storage and 22.7-37.9 MPa after thermal cycling.</p><p><strong>Conclusion: </strong>The Ceramic primer (silane containing) seems to perform better than the three-step etch and rinse adhesive or the Composite primer. Shear-type stress had an adverse effect on the repair bond strength of bulk-fill resin composites.</p>","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"10 1","pages":"2258924"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/2f/63/IABO_10_2258924.PMC10519262.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41162854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contemporary flowable bulk-fill resin-based composites: a systematic review. 当代可流动散装填充树脂基复合材料:系统回顾。
Pub Date : 2023-01-01 DOI: 10.1080/26415275.2023.2175685
Elizabeth Parra Gatica, Gerardo Duran Ojeda, Michael Wendler

Flowable bulk-fill resin-based composites (BF-RBCs) represent a new and interesting alternative for the bulk-fill restorative techniques in the posterior region. However, they comprise a heterogeneous group of materials, with important differences in composition and design. Therefore, the aim of the present systematic review was to compare the main properties of flowable BF-RBCs, including their composition, degree of monomer conversion (DC), polymerization shrinkage and shrinkage stress, as well as flexural strength. The search was conducted following PRISMA guidelines in the Medline (PubMed), Scopus and Web of Science databases. In vitro articles reporting on the DC, polymerization shrinkage/shrinkage stress, and flexural strength of flowable BF-RBCs strength were included. The QUIN risk-of-bias (RoB) tool was used for assessing the study quality. From initially 684 found articles, 53 were included. Values for DC ranged between 19.41 and 93.71%, whereas polymerization shrinkage varied between 1.26 and 10.45%. Polymerization shrinkage stresses reported by most studies ranged between 2 and 3 MPa. Flexural strength was above 80 MPa for most materials. A moderate RoB was observed in most studies. Flowable BF-RBCs meet the requirements to be indicated for bulk fill restoration technique in the posterior region. However, important variations among composition and properties hinder extrapolation of the results to materials different from those reported here. Clinical studies are urgently required to assess their performance under a real working scenario.

可流动填充树脂基复合材料(bf - rbc)代表了一种新的和有趣的替代后区填充修复技术。然而,它们由异质材料组成,在组成和设计上有重要的差异。因此,本系统综述的目的是比较可流动bf -红细胞的主要性能,包括它们的组成、单体转化率(DC)、聚合收缩和收缩应力以及抗弯强度。在Medline (PubMed)、Scopus和Web of Science数据库中按照PRISMA指南进行检索。包括了报道DC、聚合收缩/收缩应力和可流动bf -红细胞强度的弯曲强度的体外文章。使用奎恩风险偏倚(RoB)工具评估研究质量。从最初发现的684篇文章中,收录了53篇。DC值在19.41 ~ 93.71%之间,聚合收缩率在1.26 ~ 10.45%之间。大多数研究报告的聚合收缩应力范围在2和3mpa之间。大多数材料的抗弯强度在80mpa以上。在大多数研究中观察到中度罗伯。可流动的bf -红细胞符合后区大块填充修复技术的要求。然而,组成和性质之间的重要变化阻碍了将结果外推到与这里报道的不同的材料。迫切需要临床研究来评估它们在真实工作场景下的表现。
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引用次数: 1
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Biomaterial investigations in dentistry
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