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Discoloration after revascularization using calcium phosphosilicate-based bioceramic versus mineral trioxide aggregate in necrotic immature permanent anterior teeth: A Randomized clinical trial 在坏死的未成熟恒前牙中使用磷硅酸钙生物陶瓷与三氧化二铝骨料进行血管再造术后的变色:随机临床试验
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_337_23
Rana Tarek Bartaw, Mahmoud Hamdy Eid, Randa Youssef Abd Al Gawad, Ahmed Mohamed Abdel Samad
The aim of the current study is to evaluate the effect of calcium phophosilicate-based bioceramic “Totalfill bioceramic putty” and white mineral trioxide aggregate (WMTA) as the coronal plug on discoloration after revascularization of necrotic immature permanent anterior teeth. This study was conducted on (48) necrotic young permanent central incisors in children ranging from 8 to 14 years old, that were randomly allocated to either Totalfill bioceramic (Group I = 24) or WMTA (Group II = 24) as the coronal plug. Two visits revascularization protocol was adopted in this study using 1.5% sodium hypochlorite, followed by 17% ethylenediaminetetraacetic acid, and ending with a saline flush as irrigation solution. The double antibiotic paste was used as intracanal medication. The blood clot was used as scaffold followed by the application of collagen membrane followed by coronal plud malterial. Finally, the access was sealed using resin composite restoration and composite restoration. Clinical assessment was conducted at 1, 3, 6, 9, and 12 months, while radiographic assessment was conducted at 6 and 12 months. Data were statistically analyzed using the Chi-squared test for intergroup comparisons and Cochran’s Q test for intragroup comparison. Clinically, Group I exhibited a success rate of 100%, whereas Group II exhibited a success rate of 85.7%. Radiographically, both materials showed a 90.5% success rate. There was no statistically significant difference between both materials for all assessed clinical and radiographic parameters at different follow-up periods. Both Totalfill bioceramic putty and WMTA can be used successfully as coronal plug in esthetic areas.
本研究的目的是评估以磷硅酸钙为基质的生物陶瓷 "Totalfill 生物陶瓷腻子 "和以三氧化二铝白矿物质骨料(WMTA)为冠栓对坏死的未成熟恒前牙血管再通后变色的影响。 这项研究的对象是(48)颗坏死的年幼恒中切牙,年龄从 8 岁到 14 岁不等,他们被随机分配到 Totalfill 生物陶瓷(I 组 = 24 颗)或 WMTA(II 组 = 24 颗)作为冠状塞。本研究采用了两次血管再通方案,先用 1.5% 次氯酸钠,再用 17% 乙二胺四乙酸,最后用生理盐水冲洗作为冲洗液。双重抗生素糊剂用作龋洞内用药。用血凝块作为支架,然后铺上胶原膜,再铺上冠髓。最后,使用树脂复合树脂修复体和复合树脂修复体封闭通路。在 1、3、6、9 和 12 个月时进行临床评估,在 6 和 12 个月时进行放射学评估。组间比较采用Chi-squared检验,组内比较采用Cochran's Q检验,对数据进行统计分析。 在临床上,I 组的成功率为 100%,而 II 组的成功率为 85.7%。在影像学上,两种材料的成功率均为 90.5%。在不同的随访期内,两种材料在所有临床和放射学参数上的评估差异均无统计学意义。 Totalfill 生物陶瓷油灰和 WMTA 都可以成功地用作美容区域的冠状塞。
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引用次数: 0
Comparative evaluation of accuracy of working length determination with fifth-generation apex locator using two different techniques: An in vitro study 使用两种不同技术对第五代牙尖定位仪测定工作长度的准确性进行比较评估:体外研究
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_210_23
R. Monisha, A. Sivakumar, M. Chittrarasu, Sivakumar Jambai Sampath, Saravana Priyan Soundappan, R. Benny
Accurate working length (WL) determination is essential for successful root canal therapy. The aim of this study was to compare the difference between two different techniques in locating minor constriction using fifth-generation electronic apex locator. A detailed protocol explaining the procedures of the study was submitted to the institutional ethics committee. Forty extracted human permanent canine teeth were selected. WL was measured three times for each sample by three different examiners for both the conventional and experimental techniques at different time intervals. Interexaminers were blinded to their measurements, and the person who analyzed mean value was also blinded with techniques. Finally, radiographic working length was obtained using 15 size K-file. A size 20 K-file was cemented into the measured position with glass ionomer cement. Each tooth was viewed under a stereomicroscope at ×40 magnification. The distance from the file tip to the root apex was measured and calibrated to the nearest tenth of a millimeter. Using Stata statistical software (Version 17, Statacorp, College Station, Texas, USA). The agreement between raters and techniques was determined using intraclass correlation coefficient “ICC” and Bland–Altman plot. The “experimental method” (0.95, 95%) showed better agreement between the raters in comparison with the “conventional method” (0.93, 95%). The experimental technique showed perfect agreement between examiners in locating the minor constriction of the apical foramen.
准确测定工作长度(WL)对于成功的根管治疗至关重要。 本研究旨在比较两种不同技术在使用第五代电子根尖定位仪定位小收缩时的差异。 已向机构伦理委员会提交了解释研究程序的详细方案。 研究选取了 40 颗拔出的人类恒牙。由三位不同的检查者在不同的时间间隔对每个样本进行三次传统和实验技术的 WL 测量。检查者之间的测量结果是盲测,分析平均值的人也是盲测。最后,使用 15 号 K 型锉获得放射工作长度。用玻璃离子粘固剂将 20 号 K 型锉粘固到测量位置。在立体显微镜下以 ×40 倍的放大率观察每颗牙齿。测量锉尖到根尖的距离,并校准到最接近的十分之一毫米。 使用 Stata 统计软件(版本 17,Statacorp,College Station,Texas,USA)。使用类内相关系数 "ICC "和布兰德-阿尔特曼图确定评分者和技术之间的一致性。 与 "传统方法"(0.93,95%)相比,"实验方法"(0.95,95%)显示出评分者之间更好的一致性。 实验技术在确定根尖孔小收缩的位置方面显示出检查者之间的完全一致。
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引用次数: 0
Mines of cytokine: A treasure trove in pulpal and periapical diseases 细胞因子之矿:牙髓和根尖周疾病的宝库
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_289_23
Neelam D Chandwani, Unnati Devanand Gedam, Ranjana Deshmukh, Darshan M Dakshindas, Manish Shrigiriwar
Pulpitis is a special disease of dental pulp. It causes localized inflammation, due to various inflammatory mediators such as cytokines and chemokines. These inflammatory mediators are responsible for various reparative and resorptive processes in the dental pulp. The balance between these processes ultimately determines the viability of the tooth. Due to the important properties of various inflammatory markers, the correlation of cytokinin gene expression in various stages of inflammation becomes necessary to focus on. Several studies in the past have focused on the importance of such correlation to help in diagnostic applications. The nature of these inflammatory mediators can help us in diagnostic evaluation. Several attempts have been made to focus on these associations so that it can assist in making clinical decisions effectively. The data available are vast but are the most neglected topic. This review article briefly outlines and summarizes the importance of various inflammatory mediators such as cytokinin and chemokines in various pathways of pulpal and periapical inflammation in explanatory and diagrammatic forms. Knowledge gained about pulpal inflammatory response may aid in understanding the molecular level of inflammatory pulpal and periapical diseases, which shall modify our future diagnostic modalities. Several medicaments are used in the treatment of minimal to advanced dental caries which leads to periapical infections. Thorough understanding of these medicaments can resolve secondary infection and can improve the prognosis of the treated tooth.
牙髓炎是牙髓的一种特殊疾病。由于细胞因子和趋化因子等各种炎症介质的作用,它会引起局部炎症。这些炎症介质对牙髓的各种修复和复原过程负责。这些过程之间的平衡最终决定了牙齿的存活能力。由于各种炎症标志物的重要特性,细胞活素基因表达在炎症不同阶段的相关性成为了关注的焦点。过去的一些研究重点关注了这种相关性在诊断应用中的重要性。这些炎症介质的性质可以帮助我们进行诊断评估。我们已多次尝试关注这些关联,以便帮助我们有效地做出临床决策。现有的数据非常丰富,但却是最容易被忽视的话题。这篇综述文章以解释和图解的形式简要概述和总结了各种炎症介质(如细胞因子和趋化因子)在牙髓和根尖周炎的各种途径中的重要性。牙髓炎症反应方面的知识有助于了解牙髓和根尖周炎症性疾病的分子水平,从而改变我们未来的诊断方法。有几种药物被用于治疗导致根尖周炎的轻度到晚期龋齿。对这些药物的透彻了解可以解决继发感染问题,改善治疗后牙齿的预后。
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引用次数: 0
Comparative evaluation of smear layer removal by using different irrigant activation techniques: An in vitro scanning electron microscopic study 使用不同冲洗剂活化技术去除涂抹层的比较评估:体外扫描电子显微镜研究
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_254_23
Maninder Kaur, M. Singla, Harleen Kaur, Litik Mittal, Saloni Gupta, Mintu Maria Joseph
This in vitro study aims to assess and compare the effectiveness of different irrigation activation techniques in removing the smear layer from the root canal dentin using Scanning electron microscope (SEM) analysis. A total of 60 extracted single-rooted premolar with straight canal and mature apex were used for this study. After the selection of teeth, all the samples were decoronated followed by biomechanical preparation. The sample after preparation was irrigated with sodium hypochlorite and randomly divided into three groups with 20 sample in each group (n = 20), (Group 1) control, (Group 2) ultrasonic, and (Group 3) laser. The irrigant activation was done in all the groups and then sample was prepared for the scanning electron microscope analysis. The statistical analysis was performed using the Mann–Whitney-U-test. The findings suggested that the diode laser irrigant activation technique was superior to the ultrasonic and conventional techniques to eradicate smear layers. With the limitation of this study, diode laser activation showed better cleaning of root dentinal walls compared to ultrasonic activator and traditional method.
这项体外研究旨在通过扫描电子显微镜(SEM)分析,评估和比较不同的灌洗激活技术在去除根管牙本质污垢层方面的效果。 本研究共使用了 60 颗拔出的单根前磨牙,这些牙齿具有直管和成熟的根尖。选定牙齿后,对所有样本进行装饰,然后进行生物力学制备。制备后的牙样用次氯酸钠冲洗,并随机分为三组,每组 20 个牙样(n = 20),分别为(第 1 组)对照组、(第 2 组)超声波组和(第 3 组)激光组。所有组别都进行了冲洗剂活化,然后制备样品用于扫描电子显微镜分析。 统计分析采用 Mann-Whitney-U 检验法。 研究结果表明,在消除涂抹层方面,二极管激光冲洗剂激活技术优于超声波和传统技术。 由于这项研究的局限性,与超声波激活剂和传统方法相比,二极管激光激活剂能更好地清洁牙根壁。
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引用次数: 0
Dentinal tubule penetration following ultrasonic, sonic, and single-cone technique of a biosealer: An ex vivo study 采用超声波、声波和单锥体技术的生物治疗仪的牙本质小管穿透性:体外研究
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_244_23
Dina Abdellatif, Massimo Pisano, Renato Gullà, G. Sangiovanni, Shishir Singh, Francesco Giordano, A. Buonavoglia, A. Iandolo
The endodontic space is complex, and using a single-cone obturation technique fails to ensure a complete filling. This study aimed to investigate the effect of ultrasonic activation, sonic activation, and single-cone technique of a biosealer on its dentinal tubular penetration. In the experiment, single-root mandibular premolars were randomly assigned to three groups (n = 20): group A, ultrasonic activation; Group B, sonic activation; and Group C, single-cone technique. Penetration of the fluorescently labeled biosealer was investigated using a confocal laser scanning microscope. The data were statistically analyzed using Kruskal–Wallis and Mann–Whitney tests (P = 0.05). The highest penetration of biosealer was observed in Group A, followed by Group B (P < 0.05). Dentinal tubule penetration of biosealer was significantly improved by ultrasonic and sonic activation techniques.
牙髓空间非常复杂,使用单锥体封闭技术无法确保完全充填。 本研究旨在探讨超声激活、声波激活和单锥技术对生物封闭剂牙本质管穿透的影响。 实验中,单根下颌前磨牙被随机分为三组(n = 20):A 组,超声波激活;B 组,声波激活;C 组,单锥技术。使用共焦激光扫描显微镜对荧光标记的生物标记物的穿透性进行研究。 数据采用 Kruskal-Wallis 和 Mann-Whitney 检验进行统计分析(P = 0.05)。A 组的生物胶渗透率最高,其次是 B 组(P < 0.05)。 超声波和声波激活技术明显改善了生物治疗器的牙本质小管穿透性。
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引用次数: 0
Polymerase chain reaction-based identification of various serotypes of Streptococcus mutans in adults with and without dental caries 基于聚合酶链式反应鉴定龋齿和未龋齿成人中变异链球菌的各种血清型
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_312_23
Tanakanti Praveen, V. Kotrashetti, R. Nayak, S. Naik, Kishore Bhat, Manohar S. Kugaji
Dental caries is a multistep process which initiates the development of plaque‚ defined as a structured biofilm containing microbial communities. Teeth provide unique surfaces for bacterial colonization. Serotypes of Streptococcus mutans implicate the development of dental caries. The aim of the study was to determine the prevalence and association of serotypes of S. mutans in groups with and without dental caries. One hundred and fifty adults aged between 18 and 35 years were included in the study. Supragingival plaque samples were collected, followed by deoxyribonucleic acid extraction. Polymerase chain reaction was performed to identify S. mutans and its serotypes. Proportions of S. mutans and its serotypes were correlated with caries-active (CA) and caries-free (CF) groups. CA group showed 66.7% positivity for S. mutans and CF group showed only 42.7% of positivity. Serotype C showed a higher proportion followed by E‚ F, and K in the CA group, whereas in the CF group, higher proportion was observed with K followed by C‚ E, and F. 70.8% cases showed single serotype in the CA group and 83.3% in CF group. Multiple serotypes were seen in 29.2% in the CA group and 16.7% in the CF group. The study clearly established variation in proportions of S. mutans and its serotypes between CA and CF groups. Positive correlation was observed in the CA group for S. mutans and its serotypes.
龋齿是一个多步骤的过程,它导致牙菌斑的形成,"牙菌斑 "被定义为含有微生物群落的结构化生物膜。牙齿为细菌定植提供了独特的表面。变异链球菌的血清型与龋齿的形成有关。 这项研究旨在确定变异链球菌血清型在龋齿和非龋齿人群中的流行率和关联性。 研究对象包括 150 名年龄在 18 至 35 岁之间的成年人。采集龈上牙菌斑样本,然后进行脱氧核糖核酸提取。聚合酶链式反应用于鉴定变异杆菌及其血清型。变异杆菌及其血清型的比例与龋病活动组(CA)和无龋组(CF)相关。 CA组的变异杆菌阳性率为66.7%,而CF组仅为42.7%。在 CA 组中,血清型为 C 的比例较高,其次是 E' F 和 K,而在 CF 组中,血清型为 K 的比例较高,其次是 C' E 和 F。CA组中有29.2%的病例有多种血清型,CF组中有16.7%的病例有多种血清型。 该研究清楚地表明,CA 组和 CF 组之间的变异棒状杆菌及其血清型的比例存在差异。在CA组中观察到变异杆菌及其血清型呈正相关。
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引用次数: 0
Evaluation of different mechanical cleaning protocols associated with 2.5% sodium hypochlorite in the removal of residues from the post space 评估与 2.5% 次氯酸钠配合使用的不同机械清洁方案在清除柱间隙残留物方面的效果
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_324_23
Matheus Sousa Vitória, Eran Nair Mesquita de Almeida, Antonia Patricia Oliveira Barros, Eliane Cristina Gulin de Oliveira, Joatan Lucas de Sousa Gomes Costa, A. Dantas, Milton Carlos Kuga
This study evaluated the effectiveness of different mechanical protocols using rotary brush (RB), ultrasonic tip, and oscillatory system (OS) associated with 2.5% sodium hypochlorite (NaOCl) in the removal of residues and dentin permeability in the cervical and apical segments of the post space. Experimental in vitro study. Forty roots from human first molars were prepared and divided into four groups according to the cleaning protocols: Control (CO), NaOCl 2.5% conventional irrigation with a syringe; RB associated with NaOCl 2.5%; ultrasonic tip (US) associated with NaOCl 2.5%; OS associated with NaOCl 2.5%. The persistence of residues was evaluated by scanning electron microscopy and data submitted to Kruskal–Wallis and Dunn tests, and dentin permeability evaluated by confocal microscopy and date submitted to ANOVA one-way and Tukey’s tests (P = 0.05). There were no differences in residue cleaning among the CO, RB, US, and OS groups, regardless of the analyzed root segment (P > 0.05). When comparing groups, dentin permeability in the CO group was significantly lower in the cervical segment (P < 0.05). The OS group promoted the highest permeability value in the apical segment. RB, US, and OS are similar in removing residues from the post space. However, OS results in higher dentin permeability in the apical segment.
本研究评估了使用旋转刷(RB)、超声波刷头和振荡系统(OS)以及 2.5% 次氯酸钠(NaOCl)的不同机械方案在去除牙颈部和根尖部牙本质残留物和牙本质渗透性方面的效果。 体外实验研究。 制备了 40 个人类第一磨牙的牙根,并根据清洁方案分为四组:对照组 (CO),用注射器进行 2.5% NaOCl 传统灌洗;RB 组,使用 2.5% NaOCl;超声波头组 (US),使用 2.5% NaOCl;OS 组,使用 2.5% NaOCl。 残留物的持久性通过扫描电子显微镜进行评估,数据提交 Kruskal-Wallis 和 Dunn 检验,牙本质渗透性通过共聚焦显微镜进行评估,数据提交 ANOVA 单向检验和 Tukey's 检验(P = 0.05)。 无论分析的根段如何,CO、RB、US 和 OS 组在残留物清洁方面均无差异(P > 0.05)。比较各组,CO 组的牙本质渗透性在颈段明显较低(P < 0.05)。 OS 组在根尖段的牙本质渗透性值最高。RB、US 和 OS 在清除牙柱间隙残留物方面的效果相似。但是,OS 在根尖区段的牙本质渗透性更高。
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引用次数: 0
Retreatability of NeoSEALER Flo obturated with warm vertical compaction versus single-cone technique using two different retreatment systems 使用两种不同的再处理系统,用温热垂直压实法与单锥技术钝化 NeoSEALER Flo 的可再处理性比较
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_314_23
Toka Kamaleldeen Elzanaty, M. Elashiry, A. Mahran
The aim of this study was to compare the retreatability of NeoSEALER Flo obturated with warm vertical compaction (WVC) and single-cone (SC) techniques using two different retreatment systems. Thirty-two root canals were shaped and obturated with NeoSEALER Flo either in an SC obturation technique or a WVC technique. Samples were retreated using ProTaper retreatment or EdgeFile XR retreatment system. The percentage of remaining debris after retreatment was analyzed under a scanning electron microscope using ImageJ software. The time taken to reach full working length (WL) and induce patency was recorded. Statistical analysis was performed using an unpaired t-test and a one-way analysis of variance test. The percentage of remaining debris after retreatment was significantly higher in the SC technique than in the WVC technique, regardless of the retreatment system used. EdgeFile XR system removed more filling material than the ProTaper retreatment system, regardless of the obturation technique. The apical region showed significantly higher remaining debris than other regions in all groups. The WL and patency were achieved faster in the SC group, while in the WVC group, the EdgeFile XR system was faster. The WVC technique showed better retrieval of the filling material; however, a longer time was taken for retreatment. EdgeFile XR system performed better in removing filling materials from inside the canals.
本研究的目的是通过两种不同的再治疗系统,比较用温热垂直压实(WVC)和单锥体(SC)技术封固的 NeoSEALER Flo 的可再治疗性。 研究人员用 NeoSEALER Flo 对 32 个根管进行了塑形,并用 SC 封闭技术或 WVC 技术进行了封闭。使用 ProTaper 再治疗系统或 EdgeFile XR 再治疗系统对样本进行再治疗。使用 ImageJ 软件在扫描电子显微镜下分析再处理后残留碎屑的百分比。记录达到完全工作长度(WL)和诱导通畅所需的时间。 统计分析采用非配对 t 检验和单因素方差分析。 无论使用哪种再治疗系统,SC 技术再治疗后残留碎片的百分比都明显高于 WVC 技术。EdgeFile XR系统比ProTaper再治疗系统去除更多的充填材料,无论采用哪种封固技术。在所有组别中,根尖区的残余碎屑明显高于其他区域。在 SC 组中,实现 WL 和通畅的速度更快,而在 WVC 组中,EdgeFile XR 系统的速度更快。 WVC 技术显示出更好的填充材料回收率,但再治疗所需的时间更长。EdgeFile XR系统在从根管内部取出充填材料方面表现更好。
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引用次数: 0
Antimicrobial efficacy of two commercially available herbal products with and without ultrasonic activation in primary endodontic infections: A randomized clinical trial 两种市售草药产品(含或不含超声波活化)在牙髓感染中的抗菌效果:随机临床试验
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_308_23
Drishti Palwankar, Ashima Garg, Monika Tandan, Prashant Bhasin, Akshat Sachdeva, P. Palwankar
Effective irrigation is crucial for successful endodontic treatment. Traditional irrigants like sodium hypochlorite (NaOCl) have been widely used, but there is a growing interest in exploring natural alternatives for their potential antimicrobial properties. The study aims to compare the antimicrobial efficacy of Neem, Bitter Gourd, and NaOCl, with and without ultrasonic activation in managing primary endodontic infections. Ninety patients were randomly assigned six groups (n = 15) Group 1: NaOCl, Group 2: NaOCl with passive ultrasonic irrigation (PUI), Group 3: Neem juice, Group 4: Neem juice with PUI, Group 5: Bitter gourd juice, and Group 6: Bitter gourd juice with PUI. Bacteriological samples were collected before (S1) and after (S2) shaping, plated on brain heart infusion agar, and colony counting was done after 24 h. Shapiro–Wilk test, one-way ANOVA, post hoc Tukey analysis, and paired t-test. All the groups demonstrated a significant reduction in bacterial count. Groups with PUI (2, 4, 6) demonstrated higher mean bacterial reduction than their counterparts without PUI (1, 3, 5). Neem and Bitter gourd juices, particularly when used with PUI, demonstrated antimicrobial efficacy comparable to NaOCl with PUI.
有效的冲洗对于成功的牙髓治疗至关重要。次氯酸钠(NaOCl)等传统冲洗剂已被广泛使用,但人们对探索天然替代品的潜在抗菌特性越来越感兴趣。 本研究旨在比较印楝、苦瓜和次氯酸钠(含或不含)在治疗原发性牙髓感染时的抗菌效果。 90 名患者被随机分为六组(n = 15):第 1 组:NaOCl;第 2 组:NaOCl 与被动超声波冲洗(PUI);第 3 组:印楝汁;第 4 组:印楝汁与 PUI;第 5 组:苦瓜汁;第 6 组:苦瓜汁与 PUI。在塑形前(S1)和塑形后(S2)收集细菌样本,然后将其培养在脑心输液琼脂上,24 小时后进行菌落计数。 所有组的细菌数量都明显减少。与没有使用 PUI 的组别(1、3、5)相比,使用 PUI 的组别(2、4、6)的细菌平均减少量更高。 印楝汁和苦瓜汁的抗菌效果与 NaOCl 和 PUI 的抗菌效果相当,尤其是与 PUI 一起使用时。
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引用次数: 0
Effect of herbal antioxidants on the shear bond strength of composite resin to bleached enamel at different time intervals 中草药抗氧化剂对不同时间间隔复合树脂与漂白珐琅质剪切粘接强度的影响
Pub Date : 2024-03-01 DOI: 10.4103/jcde.jcde_41_24
S. Kamat, N. H. Malgundkar, Divya Gupta, M. Kamat
Anterior tooth discolorations can be treated conservatively and noninvasively through bleaching to achieve the desired esthetic outcomes. However, bleaching along with composite resin is advisable for certain clinical cases for optimum results. However, shear bond strength (SBS) of composite resin to the bleached tooth gets significantly lowered. Before placing the composite restoration, the bleached enamel needs to be treated with antioxidant agents to increase its SBS. The study aims to evaluate and compare the effect of herbal antioxidants on SBS of composite resin to bleached enamel at different time intervals. Sixty extracted single-rooted maxillary incisors postdecoronation, keeping their labial surfaces up were mounted in cold-cure acrylic resin. The samples were randomly divided into: Group I – unbleached; Group II – 10% pine bark extract for 10 min postbleaching; Group III – 10% pine bark extract for 20 min postbleaching; Group IV – application of 10% rosemary extract for 10 min postbleaching, Group V – application of 10% rosemary extract for 20 min postbleaching; Group VI – no application of antioxidant. 35% hydrogen peroxide was used for bleaching all the samples except those which served as negative control. Later composite cylinder 4 mm in diameter and length were built on prepared enamel. The maximum load at failure was recorded using the universal testing machine. Data were analyzed using the analysis of variance and Tukey’s t-test with significance level of P < 0.05. Highest load was exhibited by Group I. Group V showed satisfactory shear strength followed by Groups IV, III, II, and VI. Both 10% rosemary and 10% pine bark extracts showed better results when applied for 20 min as compared to 10 min application. Increased duration of antioxidant application increases the SBS.
前牙变色可以通过漂白进行保守、无创的治疗,以达到理想的美学效果。不过,在某些临床病例中,为了达到最佳效果,建议在漂白的同时使用复合树脂。但是,复合树脂与漂白牙齿的剪切粘接强度(SBS)会明显降低。在放置复合树脂修复体之前,需要用抗氧化剂处理漂白过的珐琅质,以提高其 SBS。本研究旨在评估和比较不同时间间隔内中草药抗氧化剂对复合树脂与漂白珐琅质的 SBS 的影响。 研究人员将 60 颗拔出的单根上颌门牙装入冷固化丙烯酸树脂中,并保持其唇面向上。样品被随机分为第一组--未漂白;第二组--漂白后 10 分钟使用 10%松树皮提取物;第三组--漂白后 20 分钟使用 10%松树皮提取物;第四组--漂白后 10 分钟使用 10%迷迭香提取物;第五组--漂白后 20 分钟使用 10%迷迭香提取物;第六组--未使用抗氧化剂。除作为阴性对照的样品外,所有样品均使用 35% 过氧化氢进行漂白。之后在制备好的珐琅质上制作直径和长度均为 4 毫米的复合圆柱体。使用万能试验机记录破坏时的最大载荷。 数据分析采用方差分析和 Tukey's t 检验,显著性水平为 P <0.05。 第五组显示出令人满意的剪切强度,其次是第四、三、二和六组。 与使用 10 分钟相比,使用 20 分钟的 10%迷迭香和 10%松树皮提取物效果更好。抗氧化剂使用时间的延长会增加 SBS。
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Journal of Conservative Dentistry and Endodontics
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