Frontiers in Dentistry最新文献_第3页

Antimicrobial Efficacy of Saline, Chlorhexidine, and Zataria Multiflora and Mentha Piperita Essential Oils in Root Canal Irrigation of Primary Molars 生理盐水、洗必泰、多花泽兰和薄荷精油在小磨牙根管冲洗中的抗菌功效

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-06-10 DOI: 10.18502/fid.v21i19.15682

Edris Pordel, Masoud Kiani, Ahmad Jafari, Ali Reza Heidari, Ronak Bakhtiari

Objectives: This study aimed to compare the antimicrobial efficacy of saline, 0.5% and 2% Zataria multiflora (Z. multiflora) essential oil, 0.5% and 2% Mentha piperita (M. piperita) essential oil, and 0.2% chlorhexidine (CHX) as root canal irrigants for primary molar teeth. Materials and Methods: A total of 64 primary molars were used in this in vitro study. The teeth were randomly assigned to six groups (N=10). The root canals were prepared up to file #35, and all teeth were sterilized before contamination with Enterococcus faecalis (E. faecalis; ATCC 29212) suspension. After 48 hours of incubation, the root canals in each group were irrigated with the respective irrigants. Sterile paper points were then used to collect microbial samples from the root canals. A colony counter was used to count the number of colony-forming units (CFUs). Data were analyzed by SPSS version 20 (alpha=0.05). Results: The colony count was significantly different among the groups (P 0.5% M. piperita > 0.2% CHX > 2% M. piperita > 0.5% Z. multiflora. Conclusion: The current study showed the optimal antibacterial activity of 0.5% Z. multiflora essential oil and 2% M. piperita essential oil against E. faecalis, and indicated their possible efficacy for use as an irrigant for root canal irrigation of primary molars.

研究目的本研究旨在比较生理盐水、0.5% 和 2% 多花月见草精油、0.5% 和 2% 薄荷叶精油以及 0.2% 洗必泰 (CHX) 作为初级磨牙根管冲洗剂的抗菌效果。材料和方法：本体外研究共使用了 64 颗原臼齿。这些牙齿被随机分配到六组（N=10）。根管预备至 35 号锉，所有牙齿在用粪肠球菌（E. faecalis; ATCC 29212）悬浮液污染前均已消毒。培养 48 小时后，用相应的冲洗剂冲洗各组的根管。然后用无菌纸点采集根管中的微生物样本。使用菌落计数器计算菌落形成单位（CFU）的数量。数据采用 SPSS 20 版进行分析（α=0.05）。结果各组菌落计数有明显差异（P 0.5%哌啶甲醚 > 0.2% CHX > 2% 哌啶甲醚 > 0.5% 多花锆。结论目前的研究表明，0.5% 万年青精油和 2% 香叶木精油对粪肠球菌具有最佳抗菌活性，并表明它们可用作初级磨牙根管灌洗剂。

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引用次数: 0

Comparative Assessment of the Shear Bond Strength of Ceramic Brackets Bonded to the Enamel Surface with a Self-adhesive System. 使用自粘系统粘结在珐琅质表面的陶瓷牙托剪切粘结强度比较评估

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-05-22 eCollection Date: 2024-01-01 DOI: 10.18502/fid.v21i18.15551

Jalal Janfaza, Sara Valizadeh, Behrad Tanbakuchi

Objectives: This study aimed to evaluate the shear bond strength of ceramic brackets bonded to the enamel surface using Vertise Flow, with or without the application of phosphoric acid. Materials and Methods: Forty-five extracted human premolar teeth were randomly assigned to three groups (N=15) based on the adhesive used for bonding: 1) Transbond XT, etch, and bond; 2) Vertise Flow; 3) Etch and Vertise Flow. After a 500-round thermocycling procedure, the shear bond strength was measured using a universal testing machine. The samples were then evaluated under a stereomicroscope to determine failure modes, and the Adhesive Remnant Index (ARI) was measured for each group. The data were analyzed with one-way ANOVA and post-hoc Tamhane at a significance level of P<0.05. Results: The highest shear bond strength values were observed in the Transbond XT (13.5±5.38MPa), acid etch and Vertise Flow (11.2±2.89MPa), and Vertise Flow (6.2±3.16MPa) groups, respectively, in descending order. The Vertise Flow group exhibited a significantly lower shear bond strength value compared to the other two groups, with no significant difference between the latter two. Conclusion: While all three study groups demonstrated clinically acceptable shear bond strength values, Vertise Flow showed lower values compared to the other two adhesives. The Vertise Flow composite resin system, whether used alone or with acid etching, remains a suitable choice for bonding ceramic brackets, offering the advantage of a simplified bonding procedure.

研究目的本研究旨在评估使用 Vertise Flow 粘接珐琅质表面的陶瓷托槽在使用或不使用磷酸时的剪切粘接强度。材料和方法：根据粘接时使用的粘接剂，将 45 颗拔出的人类前臼齿随机分为三组（N=15）：1) Transbond XT、蚀刻和粘接；2) Vertise Flow；3) 蚀刻和 Vertise Flow。经过 500 轮热循环程序后，使用万能试验机测量剪切粘接强度。然后在体视显微镜下对样品进行评估，确定失效模式，并测量每组的粘合剂残留指数（ARI）。在显著性水平为 PR 的情况下，对数据进行了单因素方差分析和事后 Tamhane 分析：从高到低依次为 Transbond XT 组（13.5±5.38MPa）、酸蚀和 Vertise Flow 组（11.2±2.89MPa）和 Vertise Flow 组（6.2±3.16MPa）的剪切粘接强度值最高。与其他两组相比，Vertise Flow 组的剪切粘接强度值明显较低，后两组之间无明显差异。结论：虽然所有三个研究组都显示出临床上可接受的剪切粘接强度值，但 Vertise Flow 显示出的值低于其他两种粘合剂。Vertise Flow 复合树脂系统无论是单独使用还是与酸蚀刻一起使用，都是粘接陶瓷托槽的合适选择，其优点是粘接程序简化。

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引用次数: 0

Dimensional Accuracy of Two-Step Impressions Relined with Extra-Light Addition Silicone Material. 使用超轻添加硅胶材料重衬的两步式印模的尺寸精度。

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-05-20 eCollection Date: 2024-01-01 DOI: 10.18502/fid.v21i17.15550

Alireza Jafari, Esmat Mombeini, Leila Payaminia, Elaheh Beyabanaki, Rahim Tahmasebi

Objectives: Some small defects may remain in the impression after making a two-step putty-light body impression. The aim of this study was to evaluate and compare the dimensional accuracy of 2-step and relined 2-step (3-step) putty-light body impressions. Materials and Methods: In this in vitro study, 30 impressions were made with putty, light body, and extra-light body addition silicone materials using the 2-step and 3-step impression techniques (N=15). An epoxy resin master model was made duplicating a maxillary typodont with left first premolar and first molar teeth prepared with a shoulder finish line and truncated pyramidal-shaped indices in the mid-palate and third molar sites. In addition to creating a reference digital model by scanning the master model, 30 master casts were scanned to produce digital models. The anteroposterior (AP) and cross-sectional (CS) dimensional accuracy of the models were compared with the master model using linear measurements. Moreover, tooth size measurements were made and compared using the root mean square (RMS). Two-sample t-test was applied to analyze the data (α=0.05). Results: The mean AP and RMS differences between the two study groups were not significant (P>0.05). However, the CS difference between the two groups was significant (P<0.001), and the 3-step impression technique showed smaller discrepancies in comparison to the master model. Conclusion: There was no significant difference in accuracy of the two techniques for single-unit and multiple-unit preparations. The 3-step impression technique had a higher CS dimensional accuracy.

目标：在制作两步式腻子轻体印模后，印模中可能会残留一些小缺陷。本研究的目的是评估和比较两步式和再衬两步式（三步式）腻子轻体印模的尺寸精度。材料和方法：在这项体外研究中，使用 2 步法和 3 步法印模技术，使用腻子、轻体和超轻体添加硅胶材料制作了 30 个印模（N=15）。制作了一个环氧树脂主模型，复制了左侧第一前磨牙和第一磨牙的上颌正畸，在中腭和第三磨牙部位制备了肩部完成线和截断的金字塔形指数。除了通过扫描主模型创建参考数字模型外，还扫描了 30 个铸模以制作数字模型。通过线性测量将模型的前后（AP）和横截面（CS）尺寸精度与主模型进行比较。此外，还进行了牙齿尺寸测量，并使用均方根（RMS）进行比较。数据分析采用双样本 t 检验（α=0.05）。结果：两个研究组的平均 AP 和 RMS 差异不显著（P>0.05）。然而，两组之间的 CS 差异显著（PC结论：两组之间的 CS 差异显著（P>0.05），而 AP 差异显著（P>0.05）：两种技术在单义齿和多义齿预备的准确性上没有明显差异。三步印模技术的 CS 尺寸准确度更高。

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引用次数: 0

Effect of Hydrothermal, Chemical, and Mechanical Degradation on Flexural Strength and Phase Transformation of Ground, Glazed, and Polished Zirconia 水热、化学和机械降解对研磨、上釉和抛光氧化锆挠曲强度和相变的影响

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-05-19 DOI: 10.18502/fid.v21i16.15483

Nioosha Sarabi, M. Mohammadi-Bassir, Forough Fadavi, M. Rezvani, Fahimeh Dehestani-Ardakani, Hossein Labbaf

Objectives: Evaluation of the effect of grinding on flexural strength of zirconia after low temperature degradation (LTD) and pH-cycling. Materials and Methods: Sixty-four bar-shaped specimens of yttria-stabilized tetragonal polycrystalline zirconia were milled, sintered, wet-polished, and divided into 8 groups (N=8). The four control groups were not aged while artificial aging was performed in the 4 experimental groups in three steps including LTD in steam for 40h, pH-cycling, and tooth brushing for artificial aging. All groups underwent surface preparations as follows: standard polishing without surface treatment (Sp), grinding with a blue-yellow band diamond instrument (Gr); grinding with a diamond rotary instrument (DRI) and then over-glazing (Gl); grinding with a DRI followed by two-step intraoral polishing (Po); standard polishing and aging (Sp-Ag); grinding and aging (Gr-Ag), grinding, over-glazing and aging (Gl-Ag); and grinding, polishing and aging (Po-Ag). Monoclinic content was assessed in one specimen of each group by X-ray diffraction (XRD). The 3-point flexural strength test was performed in a universal testing machine. The results were analyzed with two-way ANOVA and Tukey’s test (α=0.05). Results: Mean flexural strength (Mpa) was significantly higher in groups Gr and Po compared to group Sp (both, P<0.0001) and group Gl (both, P<0.0001). In XRD analyses, the highest monoclinic phase before aging was observed in group Gr (12.6%), and after aging in group Gr-Ag (51.2%). Conclusion: Grinding and polishing increased the flexural strength, while glazing did not exhibit any significant effect on this parameter. Furthermore, aging did not adversely affect flexural strength.

目的：评估低温降解（LTD）和 pH 循环后研磨对氧化锆抗弯强度的影响。材料与方法：对 64 块条形钇稳定四方多晶氧化锆试样进行研磨、烧结和湿法抛光，并将其分为 8 组（N=8）。4 个对照组未进行人工老化，而 4 个实验组则分三个步骤进行人工老化，包括在蒸汽中 LTD 40 小时、pH 循环和刷牙进行人工老化。所有实验组都进行了以下表面处理：不进行表面处理的标准抛光（Sp），使用蓝黄带金刚石器械进行研磨（Gr）；使用金刚石旋转器械（DRI）进行研磨，然后上釉（Gl）；使用 DRI 进行研磨，然后进行两步口内抛光（Po）；标准抛光和老化（Sp-Ag）；研磨和老化（Gr-Ag），研磨、上釉和老化（Gl-Ag）；以及研磨、抛光和老化（Po-Ag）。通过 X 射线衍射 (XRD) 评估了每组中一个试样的单斜含量。在万能试验机上进行了三点抗弯强度测试。结果采用双向方差分析和 Tukey 检验（α=0.05）进行分析。结果与 Sp 组（均为 P<0.0001）和 Gl 组（均为 P<0.0001）相比，Gr 组和 Po 组的平均抗折强度（Mpa）明显更高。在 XRD 分析中，老化前 Gr 组的单斜相最高（12.6%），老化后 Gr-Ag 组的单斜相最高（51.2%）。结论研磨和抛光提高了抗弯强度，而上釉对这一参数没有明显影响。此外，老化也不会对抗弯强度产生不利影响。

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引用次数: 0

Radiofrequency-Induced Heating of Amalgam Restorations and Dental Implants during 1.5T Magnetic Resonance Imaging. 1.5T 磁共振成像中汞合金修复体和牙种植体的射频感应加热。

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-04-27 eCollection Date: 2024-01-01 DOI: 10.18502/fid.v21i15.15393

Maryam Paknahad, Iman Khaleghi, Seyed Mohammad Javad Mortazavi

Objectives: This study aimed to evaluate radiofrequency-induced heating of different amalgam restorations and dental implants during 1.5T magnetic resonance imaging (MRI). Materials and Methods: Standardized class I cavities (5 mm long, 3 mm wide, and 3 mm deep) were prepared on the occlusal surface of 45 extracted human third molars. The samples were restored by three different types of amalgam including Cinalux amalgam (non-gamma-2, spherical), GS-80 (non-gamma-2, admix), and GK-110 amalgam (non-gamma-2, admix in silver). As a separate intervention group (G4), five titanium mini drive-lock implants with 2mm diameter and 10mm length were also selected and mounted to the base of the Eppendorf tube with 3mm of the implants extending above the mounting putty. The box containing the specimens was placed parallel to the long axis of the standard head and neck coil of the MRI device (64MHz radio-frequency energy with 25kW amplifier, 1.5T). Temperature fluctuations of the metallic materials in each group were monitored during MRI scans using a calibrated thermometer. One-way ANOVA was used to compare temperature changes among the amalgam groups (P<0.05). Results: Temperature elevations ranged from 0.21°C to 0.70°C in amalgam restorations and from 0.35 to 0.47°C in dental implants. The temperature changes among the three amalgam agents were not statistically significant. Conclusion: According to our findings, the radiofrequency-induced heating of amalgam restorations and dental implants during MRI examination can be considered within acceptable ranges. Therefore, amalgam restorations and dental implants can be categorized as "MR safe" in terms of radiofrequency-induced heating during 1.5 T MRI.

研究目的本研究旨在评估 1.5T 磁共振成像（MRI）中不同汞合金修复体和牙种植体的射频诱导加热情况。材料和方法：在 45 颗拔出的人类第三磨牙的咬合面上制备标准化的 I 类龋洞（长 5 毫米、宽 3 毫米、深 3 毫米）。样品由三种不同类型的汞合金修复，包括 Cinalux 汞合金（非伽马-2，球形）、GS-80（非伽马-2，混合）和 GK-110 汞合金（非伽马-2，银混合）。作为单独的干预组（G4），还选择了 5 个直径为 2 毫米、长度为 10 毫米的微型钛驱动锁种植体，并将其安装在 Eppendorf 管的底部，种植体的 3 毫米部分伸出安装腻子。装有试样的盒子平行于核磁共振成像设备（64MHz 射频能量，25kW 放大器，1.5T）标准头颈线圈的长轴。在磁共振成像扫描期间，使用校准温度计监测每组金属材料的温度波动。使用单因素方差分析比较了各汞合金组的温度变化（结果：温度升高的范围为 0.21-0.25℃）：汞合金修复体的温度升高了 0.21°C 至 0.70°C，牙科植入体的温度升高了 0.35°C 至 0.47°C。三种汞合金制剂之间的温度变化没有统计学意义。结论：根据我们的研究结果，在磁共振成像检查过程中，汞合金修复体和牙科种植体的射频感应加热可被视为在可接受的范围内。因此，就 1.5 T 磁共振成像中射频引起的加热而言，汞合金修复体和牙齿种植体可归类为 "磁共振安全"。

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引用次数: 0

Effect of Polishing and Universal Bonding Application on Mercury Release from Aged Amalgam after Exposure to Bleaching Agents. 暴露于漂白剂后，抛光和通用粘接应用对老化汞合金中汞释放的影响。

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-04-23 eCollection Date: 2024-01-01 DOI: 10.18502/fid.v21i14.15392

Atiyeh Feiz, Shirin Jafari, Maede Ghasemi

Objectives: Teeth bleaching is an accepted and modern treatment in cosmetic dentistry. Bleaching agents may affect amalgam restorations and increase mercury release; therefore, patients are at increased risk of mercury exposure in the body. The aim of this study was to investigate the effect of polishing and universal bonding application on mercury release from aged amalgams exposed to bleaching. Materials and Methods: In this in-vitro experimental study, 64 dental amalgam specimens with dimensions of 3×5×10 were prepared and divided into two experimental and control groups. Each group was further divided into 4 subgroups and received one of the following treatments: no intervention, surface bonding, polishing, or polishing and surface bonding. Subsequently, the samples were immersed in bleaching agent containing 7% hydrogen peroxide and the amount of mercury released after 96h was measured. The results were analyzed by two-way ANOVA and Tukey post hoc tests (α≤0.05). Results: The results showed that the type of solution (P<0.05) and surface treatment (P<0.001) significantly affected the level of mercury release. However, there was no significant interaction between surface treatment methods in the bleaching group and those in the phosphate buffer group (P=0.621). Conclusion: Bleaching agents were found to enhance mercury release from dental amalgam. The application of polishing and universal bonding on amalgam surfaces exhibited significant effects on the reduction of the mercury release.

目的：牙齿漂白是美容牙科中一种公认的现代治疗方法。漂白剂可能会影响汞合金修复体，增加汞的释放，因此患者体内汞暴露的风险增加。本研究的目的是调查抛光和通用粘接应用对暴露于漂白剂的老化汞齐汞释放的影响。材料和方法：在这项体外实验研究中，制备了 64 个尺寸为 3×5×10 的牙科汞合金试样，并将其分为实验组和对照组。每组又分为 4 个子组，分别接受以下处理之一：不干预、表面粘接、抛光或抛光和表面粘接。随后，将样本浸入含 7% 过氧化氢的漂白剂中，96 小时后测量汞的释放量。结果采用双向方差分析和 Tukey 后检验（α≤0.05）。结果显示结果表明，溶液类型（PC 结论：漂白剂可提高汞的浓度：发现漂白剂可促进汞合金中汞的释放。在汞合金表面使用抛光剂和通用粘接剂对减少汞的释放有显著效果。

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引用次数: 0

In Vitro Effects of Chlorhexidine and Isopropyl Alcohol Conditioning Agents on Immediate and Late Bond Strength of Fiber Posts to Dentin 氯己定和异丙醇调节剂对纤维桩与牙本质的初期和后期粘接强度的体外效应

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-04-23 DOI: 10.18502/fid.v21i13.15374

Mansoureh Emami Arjomand, N. Nasoohi, Mohaddeseh Shabani

Objectives: This study assessed the effect of chlorhexidine (CHX) and isopropyl alcohol (IA) on immediate and late pushout bond strength (PBS) of fiber posts to dentin. Materials and Methods: In this in vitro study, 54 single-canal premolars were endodontically treated, and randomly assigned to 3 groups (N=18) for root dentin conditioning with distilled water (control), 2% CHX, and 70% IA after post space preparation. Fiber posts were cemented with TheraCem self-adhesive cement, and each group was subdivided into two subgroups (N=9) for PBS measurement immediately after bonding, and after 5000 thermal cycles (5-55°C). The roots were then sectioned, and their PBS was measured. The mode of failure was evaluated under a stereomicroscope at ×40 magnification. Data were analyzed by repeated measures ANOVA and Tukey’s test (alpha=0.05). Results: The highest PBS was noted in the IA group (21.12 MPa) after 24 hours and the lowest PBS belonged to the control group after thermocycling (7.48 MPa). The immediate and post-thermocycling PBS were significantly lower in the control group than the CHX group (P<0.05). The PBS in both the control and CHX groups was lower than that in the IA group (P<0.001). Regardless of the type of detergent, a significant reduction in PBS was observed after thermocycling (P<0.003). The PBS significantly decreased from the cervical towards the apical region in all groups (P<0.001). Conclusion: According to the results, application of IA before the self-adhesive cement effectively improved the immediate and late PBS, and was significantly more effective than CHX.

研究目的本研究评估了洗必泰（CHX）和异丙醇（IA）对纤维桩与牙本质的即刻和后期推出粘接强度（PBS）的影响。材料和方法：在这项体外研究中，对 54 颗单管前臼齿进行了根管治疗，并随机分配到 3 组（N=18），分别使用蒸馏水（对照组）、2% CHX 和 70% IA 进行根管牙本质调理，然后进行后间隙预备。纤维桩用 TheraCem 自粘水泥粘接，每组又分为两个亚组（N=9），分别在粘接后立即和经过 5000 次热循环（5-55°C）后测量 PBS。然后对牙根进行切片，测量其 PBS。在放大到 ×40 倍的体视显微镜下对失效模式进行评估。数据分析采用重复测量方差分析和 Tukey 检验（α=0.05）。结果24 小时后，IA 组的 PBS 最高（21.12 兆帕），热循环后对照组的 PBS 最低（7.48 兆帕）。对照组刚开始和热循环后的 PBS 都明显低于 CHX 组（P<0.05）。对照组和 CHX 组的 PBS 均低于 IA 组（P<0.001）。无论使用哪种去垢剂，热循环后都观察到 PBS 显著下降（P<0.003）。所有组的 PBS 均从颈部向根尖区明显下降（P<0.001）。结论结果表明，在自粘骨水泥前应用 IA 能有效改善即刻和晚期 PBS，其效果明显优于 CHX。

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引用次数: 0

Effect of Elastomeric Module Degradation and Ligation Methods on Kinetic Friction between NiTi or Stainless Steel Wires and Stainless Steel Brackets 弹性体模块降解和连接方法对镍钛丝或不锈钢丝与不锈钢支架之间动摩擦力的影响

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-03-24 DOI: 10.18502/fid.v21i10.15222

Pooya Ebrahimi, Parastou Nastarin, Mahdi Hadilou, Behnaz Karimzadeh, Mojgan Kachoei

Objectives: The reduction of resistance to sliding between the archwire and bracket promotes more seamless tooth movement, leading to a faster and improved orthodontic treatment experience. This research aimed to examine how the degradation of elastomeric modules, different ligation methods, bracket-wire angle, and wire type (nickel titanium, NiTi or stainless-steel, SS) impact the kinetic friction resulting from the interaction between NiTi or SS archwires and SS brackets. Materials and Methods: The current in vitro study was conducted on nine groups, including NiTi and SS archwires with three types of ligations (O-ring, figure of 8, and SS wire ligature) and two bracket-wire angles (0˚ and 10˚). The kinetic friction in each group was measured using a Universal Testing Machine at four time intervals: baseline, day one, week one, and week four. Repeated measures ANOVA, Mauchly test of sphericity followed by the Greenhouse-Geisser test, and relevant post hoc tests were used for statistical analysis (P<0.05). Results: The authors found a decrease in kinetic friction in all types of ligations, which confirmed the effect of time on the degradation of ligation modules. The kinetic friction of figure of 8 ligations was higher than both O-ring and SS wire ligations. No difference was observed between O-ring and SS wire ligations. Furthermore, the bracket-wire angle did not affect friction. Conclusion: The authors suggest that the use of figure of 8 ligations in NiTi and SS wires should be limited due to their high friction and replaced with other types of ligations, if possible.

目标：减少弓丝和托槽之间的滑动阻力可促进牙齿的无缝移动，从而带来更快、更好的正畸治疗体验。本研究旨在探讨弹性模块的降解、不同的结扎方法、托槽-钢丝角度和钢丝类型（镍钛或不锈钢）如何影响镍钛或不锈钢弓丝与不锈钢托槽之间相互作用产生的动摩擦力。材料和方法：目前的体外研究对九组镍钛和 SS 弓丝进行了研究，包括三种结扎方式（O 形环、8 字形和 SS 线结扎）和两种托槽与线的角度（0˚ 和 10˚）。在基线、第一天、第一周和第四周的四个时间间隔内，使用万能试验机测量了各组的动摩擦力。采用重复测量方差分析、Mauchly 球形度检验和 Greenhouse-Geisser 检验以及相关的事后检验进行统计分析（P<0.05）。结果作者发现所有类型的结扎都会导致动摩擦力下降，这证实了时间对结扎模块降解的影响。8 字形结扎的动摩擦力高于 O 形环和 SS 线结扎。O 形环和 SS 金属丝结扎之间没有发现差异。此外，支架与钢丝的角度也不会影响摩擦力。结论：作者建议，由于镍钛和 SS 金属丝的高摩擦力，应限制使用 8 字结扎法，并尽可能用其他类型的结扎法取而代之。

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引用次数: 0

Effects of Two Remineralizing agents in Combination with Er:YAG and CO2 Laser Irradiation on Microhardness of Demineralized Enamel: A Preliminary In Vitro Study 两种再矿化剂结合 Er:YAG 和 CO2 激光照射对脱矿珐琅质微硬度的影响：体外初步研究

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-03-24 DOI: 10.18502/fid.v21i11.15223

Mehran Mapar, Sara Gholizadeh, Mina Moalemnia

Objectives: This study assessed the effects of two remineralizing agents namely MI Paste Plus containing casein phosphopeptide amorphous calcium phosphate fluoride (CPP-ACFP) and Remin Pro containing hydroxyapatite, fluoride and xylitol (HFX) with/without erbium-doped yttrium aluminium garnet (Er:YAG) and CO2 laser irradiation on demineralized enamel microhardness. Materials and Methods: In this in vitro study, 70 sound human premolars were mesiodistally sectioned, demineralized at a pH of 4.6 for 8 hours, and randomly divided into 7 remineralization groups (n=10): of (I) MI Paste Plus (CPP-ACFP), (II) Remin Pro (HFX), (III) MI Paste Plus+CO2 laser (0.7 W power, 50 Hz), (IV) Remin Pro+CO2 laser, (V) MI Paste Plus+Er:YAG laser (1 W power, 10 Hz), (VI) Remin Pro+Er:YAG laser, and (VII) negative control. The Vickers hardness number of specimens was then measured. The groups were compared by one-way ANOVA and Tukey’s test (α=0.05). Results: The mean microhardness was 319.8±49.9, 325.3±44.6, 359.4±35.7, 296.4±33.7, 319.9±58.1, 358.9±28.4, and 240.0±41.6 kg/mm2 in groups 1 to 7, respectively. The difference in microhardness was significant among the groups (P<0.0001). Pairwise comparisons revealed significant differences in microhardness between all groups (P≤0.03) except between groups 1 and 2, 1 and 5, 2 and 5, and 3 and 6 (P>0.05). Conclusion: Both Remin Pro (containing HFX) and MI Paste Plus (containing CPP-ACFP) can cause enamel remineralization. MI Paste Plus+CO2 laser irradiation and Remin Pro+Er:YAG laser irradiation were significantly more effective than the application of each remineralizing agent alone.

研究目的本研究评估了两种再矿化制剂，即含有酪蛋白磷酸肽无定形磷酸钙氟化物（CPP-ACFP）的 MI Paste Plus 和含有羟基磷灰石、氟化物和木糖醇（HFX）的 Remin Pro，以及掺铒钇铝石榴石（Er:YAG）和二氧化碳激光照射对脱矿釉质微硬度的影响。材料和方法：在这项体外研究中，对 70 颗健全的人类前臼齿进行中碘切片，在 pH 值为 4.6 的条件下脱矿 8 小时，并随机分为 7 个再矿化组（n=10）：(I) MI Paste Plus (CPP-ACFP)；(II) Remin Pro (HFX)；(III) MI Paste Plus+CO2 激光（0.7 W 功率，50 Hz）；(IV) Remin Pro+CO2 激光器；(V) MI Paste Plus+Er:YAG 激光器（1 W 功率，10 Hz）；(VI) Remin Pro+Er:YAG 激光器；(VII) 阴性对照。然后测量试样的维氏硬度数。各组之间的比较采用单因素方差分析和 Tukey 检验（α=0.05）。结果第 1 至第 7 组的平均显微硬度分别为 319.8±49.9、325.3±44.6、359.4±35.7、296.4±33.7、319.9±58.1、358.9±28.4 和 240.0±41.6 kg/mm2。各组间的显微硬度差异显著（P0.05）。结论Remin Pro（含 HFX）和 MI Paste Plus（含 CPP-ACFP）都能使釉质再矿化。 MI Paste Plus+CO2 激光照射和 Remin Pro+Er:YAG 激光照射的效果明显优于单独使用两种再矿化剂。

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引用次数: 0

A Randomized Controlled Clinical Trial Comparing Clinical and Radiographic Success Rates of MTA and rhBMP2 in Pulpotomy of Primary Teeth 比较 MTA 和 rhBMP2 在基牙牙髓切断术中的临床和放射学成功率的随机对照临床试验

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-03-24 DOI: 10.18502/fid.v21i12.15224

Nosrat Nourbakhsh, Sanaz Ziaei, Hesam Panahi, N. Sedaghat, Amirhossein Behnia

Objectives: In an ideal pulpotomy, the radicular pulp remains vital, healthy, and fully encased within an odontoblastic layer. Mineral trioxide aggregate (MTA) and bone morphogenetic proteins (BMPs) have been suggested to facilitate this outcome. We aimed to compare the clinical and radiographic failure and success rates of MTA and rhBMP2 as pulpotomy medicaments. Materials and Methods: Sixty-eight teeth from 3–6-year-old children were randomly assigned to two groups using a split-mouth design. Cervical pulpotomy was performed using MTA in one group and rhBMP2 in the other. Subsequently, the teeth were restored with stainless-steel crowns. Clinical and radiographic assessments were performed at 3, 6, 9, and 12-month follow-up intervals to evaluate success and failure rates. Data were analyzed using Chi-square test and Kaplan-Meier survival analysis (P<0.05) Results: At six and nine months, one tooth in the BMP2 group and one tooth in the MTA group showed internal resorption, respectively. After 12 months, one tooth in the BMP2 group exhibited PDL widening. The radiographic success rate was 100% for the MTA- and 97.1% for the BMP2-group at six months, 96.7% for both groups at nine months, and 96.7% and 93.3%, respectively, at 12 months. No clinical failure criteria were observed in any of the teeth. Survival analysis revealed no significant difference between the two groups. Conclusion: The study reveals comparable outcomes between rhBMP2 and MTA, suggesting rhBMP2 as a viable alternative for pulpotomy in primary teeth. With minimal incidences of complications and no significant differences noted, rhBMP2 demonstrates potential for clinical use.

目标：在理想的牙髓切除术中，根髓保持活力、健康，并完全包裹在牙本质层中。有人认为三氧化二铝矿物质聚合体（MTA）和骨形态发生蛋白（BMP）有助于实现这一结果。我们的目的是比较 MTA 和 rhBMP2 作为牙髓切除药物的临床和影像学失败率和成功率。材料和方法：采用分口设计将 68 颗来自 3-6 岁儿童的牙齿随机分配到两组。一组使用 MTA，另一组使用 rhBMP2 进行牙颈髓切断术。随后，用不锈钢牙冠对牙齿进行修复。在 3 个月、6 个月、9 个月和 12 个月的随访期间进行临床和放射学评估，以评估成功率和失败率。数据分析采用卡普兰-梅耶生存分析和卡普兰-梅耶检验（P<0.05）：6 个月和 9 个月时，BMP2 组和 MTA 组分别有一颗牙齿出现内吸收。12 个月后，BMP2 组有一颗牙齿出现 PDL 增宽。6 个月时，MTA 组和 BMP2 组的影像学成功率分别为 100%和 97.1%；9 个月时，两组的成功率均为 96.7%；12 个月时，两组的成功率分别为 96.7% 和 93.3%。所有牙齿均未达到临床失败标准。生存分析表明，两组之间没有明显差异。结论研究显示，rhBMP2 和 MTA 的疗效相当，这表明 rhBMP2 是原牙髓切断术的可行替代方法。由于并发症发生率极低，且无明显差异，rhBMP2 具有临床应用潜力。

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引用次数: 0