Frontiers in Dentistry最新文献_第5页

Severe Maxillectomy Defect Rehabilitation with an Implant-Retained Obturator Prosthesis: A Case Report 严重上颌骨切除术缺损康复与植入物固定的闭锁假体：病例报告

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-01-09 DOI: 10.18502/fid.v21i2.14669

Somayeh Niakan, Nafise Asgari, Niyousha Rafeie, Solmaz Barati

Conventional obturator prostheses might cause dissatisfaction in patients with hard or soft palate defects due to inadequate retention and function during speech, mastication, and swallowing. Thus, surgical reconstruction and implant-supported obturators are considered as alternative treatments for these patients. This case-report study describes the prosthetic reconstruction of an 88-year-old patient suffering from a hard palate defect after surgical resection of verrucous carcinoma in the left side of the hard palate. Fifteen months after radiotherapy, two implants were placed in the right side of the remaining ridge, in the second and third molar region. After the implant healing period, the implant-supported obturator prosthesis was fabricated. The patient was satisfied with the esthetics and function of the obturator at the 12-month recall visit and radiographs showed normal healing and no bone loss around the implants.

传统的闭腭假体可能会让硬腭或软腭缺损的患者感到不满意，因为它们在说话、咀嚼和吞咽时的固位和功能不足。因此，手术重建和植入物支撑的闭腭器被认为是这些患者的替代治疗方法。本病例报告研究描述了一名 88 岁患者在硬腭左侧疣状癌手术切除后硬腭缺损的修复重建情况。放疗 15 个月后，在剩余牙脊的右侧第二和第三磨牙区植入了两颗种植体。种植体愈合期结束后，制作了种植体支持的闭腭假牙。在 12 个月的复诊时，患者对遮盖器的美观和功能表示满意，X 光片显示愈合正常，种植体周围没有骨质流失。

引用次数: 0

The Efficacy of Different Antibiotic Compounds in Regenerative Treatment of Immature Necrotic Teeth 不同抗生素化合物在未成熟坏死牙再生治疗中的功效

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2024-01-02 DOI: 10.18502/fid.v21i1.14638

M. Gharechahi, M. H. Kafi, M. Javidi, Niloufar Jafari, Maryam JoibaryMoghaddam

objectives: Endodontic treatment of immature teeth poses a significant challenge, especially in achieving a proper seal using traditional obturation methods. Revascularization presents itself as an alternative approach to this problem, and the application of triple antibiotic paste (TAP) has been suggested as a means to achieve disinfection during the procedure. This study aims to compare the antibacterial properties of three different antibiotic combinations to assess their effectiveness on root canal disinfection. Materials and Methods: Eighty samples were employed to assess the impact of three antibiotic combinations on Enterococcus faecalis, Escherichia coli, Streptococcus mutans, and a combination thereof. The antibiotics included metronidazole, ciprofloxacin, and cefaclor (CCM), the commonly used TAP, and a double antibiotic paste (DAP) composed of metronidazole and ciprofloxacin. Dentin shavings collected using Gates-Glidden drills were placed in microtubes containing a 2ml standard bacterial suspension. Microtube contents were diluted and cultured on BHI agar plates, with colony counts calculated based on dentine shavings' weight in CFU/mg. Kruskal-Wallis and Dunn’s post-hoc tests were used for statistical analysis and P<0.05 was considered significant. Results: A significant difference in mean CFU was observed among all bacterial groups (P<0.05). Dunn's post-hoc analysis showed a significant difference only between the control group (methylcellulose) and the other antibiotic groups. There was no significant difference between the other antibiotic groups in two-by-two comparisons. Conclusion: There was no significant difference in the antimicrobial properties of DAP, TAP and CCM. Therefore, DAP and CCM may be used during regenerative treatment.

目的未成熟牙齿的牙髓治疗是一项重大挑战，尤其是在使用传统的封闭方法实现适当的密封方面。血管重建是解决这一问题的另一种方法，有人建议使用三联抗生素糊剂（TAP）作为在治疗过程中实现消毒的一种手段。本研究旨在比较三种不同抗生素组合的抗菌特性，以评估它们对根管消毒的效果。材料和方法：采用 80 个样本来评估三种抗生素组合对粪肠球菌、大肠杆菌、变异链球菌及其组合的影响。抗生素包括甲硝唑、环丙沙星和头孢克洛（CCM）（常用的 TAP），以及由甲硝唑和环丙沙星组成的双抗生素糊剂（DAP）。使用盖茨-格里登钻头收集的牙本质屑被放入装有 2 毫升标准细菌悬浮液的微管中。将微管内容物稀释并在 BHI 琼脂平板上培养，根据牙本质屑的重量计算菌落计数（CFU/mg）。统计分析采用 Kruskal-Wallis 和 Dunn 的事后检验，P<0.05 为差异显著。结果所有细菌组的平均 CFU 均有明显差异（P<0.05）。邓恩事后分析表明，只有对照组（甲基纤维素）和其他抗生素组之间存在显著差异。在两两比较中，其他抗生素组之间没有明显差异。结论DAP、TAP 和 CCM 的抗菌特性无明显差异。因此，DAP 和 CCM 可用于再生治疗。

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引用次数: 0

Effect of Plasma Radiation and Other Surface Preparation Methods on Microtensile Bond Strength of Repaired Aged Resin Composite 等离子辐射和其他表面处理方法对修复过的老化树脂复合材料微拉伸粘接强度的影响

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-12-18 DOI: 10.18502/fid.v20i44.14419

Mozhan Mesgarzadegan, T. Hooshmand, Pardis Akbari

Objectives: The purpose of this study was to compare the effect of plasma irradiation and other surface preparation methods on the microtensile bond strength of repaired resin composites. Materials and Methods: Twenty molds of a universal nanohybrid composite were prepared, aged and subjected to thermocycling. The specimens were divided into 5 groups for surface preparations including, C (Control): application of GC G-Premio Bond (GP) only; SB: sandblasting with alumina and GP; SI: application of phosphoric acid etching, silane, and unfilled resin; RB: roughening by diamond bur, phosphoric acid etching and GP; PL: application of argon and atmosphere plasma and then GP. The specimens were repaired with the new resin composite, cut to 1mm2 beam, and then subjected to thermocycling. The microtensile bond strengths were measured using a universal testing machine. The failure modes were assessed with a stereomicroscope. Data were analyzed using two-way ANOVA and Tukey's test. The level of significance was α=0.05. Results: The highest mean bond strength was found for the application of universal bonding GC GP in controls (26.62MPa) and the lowest average bond strength belonged to the SI groups (9.06MPa). The difference in the mean bond strength between the SI group and other groups was significant (P<0.05). The failure mode of specimens in all groups was predominantly adhesive. Conclusion: The application of GP as an intermediate universal adhesive established a proper bond between the old and new resin composite. In addition, the plasma application and other surface preparation methods did not significantly improve the bond strength.

研究目的本研究旨在比较等离子辐照和其他表面处理方法对修复后树脂复合材料微拉伸粘接强度的影响。材料与方法：制备 20 个通用纳米杂化复合材料模具，进行老化和热循环。试样分为 5 组进行表面处理，包括：C（对照组）：仅使用 GC G-Premio Bond（GP）；SB：氧化铝喷砂和 GP；SI：使用磷酸蚀刻、硅烷和未填充树脂；RB：使用金刚石毛刺粗化、磷酸蚀刻和 GP；PL：使用氩气和大气等离子体，然后使用 GP。用新的树脂复合材料修复试样，切割成 1 平方毫米的横梁，然后进行热循环。使用万能试验机测量微拉伸粘接强度。用体视显微镜对失效模式进行评估。数据分析采用双向方差分析和 Tukey 检验。显著性水平为 α=0.05。结果对照组应用通用粘接 GC GP 的平均粘接强度最高（26.62MPa），SI 组的平均粘接强度最低（9.06MPa）。SI 组与其他组的平均粘接强度差异显著（P<0.05）。各组试样的失效模式均以粘接为主。结论应用 GP 作为中间通用粘合剂在新旧树脂复合材料之间建立了适当的粘接。此外，等离子应用和其他表面处理方法并未显著提高粘接强度。

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引用次数: 0

Composite Resin Bond Strength to Zirconia and Base Metal Alloys Using Two Types of Intraoral Porcelain Repair Systems 使用两种口内瓷修复系统提高复合树脂与氧化锆和贱金属合金的粘接强度

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-12-10 DOI: 10.18502/fid.v20i43.14381

Mahnaz Arshad, Rasamedin Gordan, Paniz Farrokhi, S. Habibzadeh

Objectives: This study aimed to evaluate the shear bond strength (SBS) of two repair composites (Crea.lign vs. PermaFlo) to a base metal alloy and zirconia ceramic. Materials and Methods: Sixty-four discs (12mm diameter, 1mm thickness) were fabricated using Wirobond base metal alloy and zirconia. They were then bonded with their respective composite resins (N=16) in each of the two porcelain chipping repair kit subgroups consisting of PermaFlo and Crea.lign. All specimens were stored in 37°C distilled water for 24 hours. Half of them were subjected to 10,000 thermal cycles (5-55°C, 30s). All specimens were tested for SBS with a universal testing machine. Failure types were analyzed using a digital camera. Analysis of the data was done by two-way ANOVA and Bonferroni post-hoc tests. Results: SBS was significantly affected by the type of composite resin. PermaFlo had a significantly higher SBS than Crea.lign to base metal alloy (P<0.001) and zirconia ceramic (P<0.001). Thermocycling decreased the SBS of both composites to base metal alloy (P<0.001) and zirconia (P<0.001). Conclusion: A universal adhesive could provide higher shear bond strength of zirconia and base metal alloy to composite resin than Crea.lign composite and the MKZ primer supplied by its manufacturer.

目的:评价两种修复复合材料(Crea)的剪切结合强度(SBS)。lign vs. PermaFlo)为贱金属合金和氧化锆陶瓷。材料与方法:采用Wirobond基体金属合金和氧化锆制备64个直径12mm，厚度1mm的圆盘。然后在PermaFlo和Crea.lign组成的两个瓷屑修复套件亚组中分别与各自的复合树脂(N=16)结合。所有标本在37℃蒸馏水中保存24小时。其中一半进行了10,000次热循环(5-55°C, 30s)。所有试件均采用万能试验机进行SBS检测。用数码相机分析了故障类型。数据分析采用双向方差分析和Bonferroni事后检验。结果:SBS受复合树脂种类的影响显著。PermaFlo的SBS明显高于Crea。与贱金属合金(P<0.001)和氧化锆陶瓷(P<0.001)相关。热循环降低了复合材料对贱金属合金(P<0.001)和氧化锆(P<0.001)的SBS。结论:与Crea相比，通用胶粘剂能提供更高的氧化锆及贱金属合金与复合树脂的剪切粘接强度。木质复合材料及其制造商提供的MKZ底漆。

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引用次数: 0

The Effect of Recommended Mouthwashes on the Shear Bond Strength of Orthodontic Brackets during the Covid-19 Pandemic: An In Vitro Study. 在 Covid-19 大流行期间，推荐漱口水对正畸托槽剪切粘接强度的影响：体外研究

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-11-20 eCollection Date: 2023-01-01 DOI: 10.18502/fid.v20i42.14108

Amir Hossein Mirhashemi, Rashin Bahrami

Objectives: This study aimed to assess the impact of recommended mouthwashes (chlorhexidine, hydrogen peroxide, and povidone-iodine) used during the COVID-19 pandemic on the shear bond strength (SBS) of orthodontic brackets. Materials and Methods: A total of 52 human premolar teeth were divided into 4 groups (N=13) consisting of no intervention (control group), 0.2% chlorhexidine, 1.5% hydrogen peroxide, and 0.2% povidone-iodine. Following immersion in the mouthwashes, orthodontic brackets were bonded to enamel surfaces. Then, the brackets were debonded using a universal testing machine. The specimens were evaluated with a scanning electron microscope (SEM) and adhesive remnant index (ARI) score was assessed. One-way ANOVA and Tukey test were used for statistical analysis and P<0.05 was considered significant. Results: The SBS of the experimental groups decreased compared to the control group. The highest SBS mean value was observed in the controls and the lowest was found in the 0.2% povidone-iodine group. Significant differences in SBS values were found between the 0.2% povidone-iodine group and the 1.5% hydrogen peroxide group when compared to the control group (P=0.023, P=0.028, respectively). SEM analysis revealed similar characteristics among the groups, with a closer resemblance between the chlorhexidine and control groups. Additionally, these groups exhibited greater etching depth compared to the other groups. Conclusion: Our findings highlight the importance of careful selection and application of mouthwashes in orthodontic procedures. While 1.5% hydrogen peroxide and 0.2% povidone-iodine may have some impact on bond strength, their use can still be considered acceptable within defined limits.

研究目的本研究旨在评估 COVID-19 大流行期间使用的推荐漱口水（洗必泰、过氧化氢和聚维酮碘）对正畸托槽剪切粘接强度 (SBS) 的影响。材料与方法将 52 颗人类前磨牙分为 4 组（N=13），分别为无干预组（对照组）、0.2% 洗必泰组、1.5% 过氧化氢组和 0.2% 聚维酮碘组。在漱口水中浸泡后，将正畸托槽粘合到珐琅质表面。然后，使用万能试验机对托槽进行脱粘处理。用扫描电子显微镜（SEM）对试样进行评估，并对粘合剂残留指数（ARI）进行评分。采用单因素方差分析和 Tukey 检验进行统计分析，并得出结果：与对照组相比，实验组的 SBS 有所下降。对照组的 SBS 平均值最高，0.2% 聚维酮碘组最低。与对照组相比，0.2% 聚维酮碘组和 1.5% 过氧化氢组的 SBS 值有显著差异（分别为 P=0.023 和 P=0.028）。扫描电镜分析表明，各组的特征相似，洗必泰组和对照组的特征更为接近。此外，与其他组相比，这些组的蚀刻深度更大。结论：我们的研究结果强调了在正畸过程中谨慎选择和使用漱口水的重要性。虽然 1.5% 过氧化氢和 0.2% 聚维酮碘可能会对粘接强度产生一些影响，但在规定的范围内使用它们仍然是可以接受的。

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引用次数: 0

Barriers to the Accessibility of Emergency Pediatric Dental Care Services During the COVID-19 Pandemic: A Qualitative Study in Mashhad, Iran COVID-19大流行期间儿童获得紧急牙科护理服务的障碍:在伊朗马什哈德进行的一项定性研究

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-11-12 DOI: 10.18502/fid.v20i41.14023

Fatemeh Khorakian, Iman Parisay, Arezou Zare Incheh Sabelagh, Hooman Keshavarz

Objectives: The aim of this study was to investigate barriers to the accessibility of emergency pediatric dental care services during the coronavirus disease 2019 (COVID-19) pandemic from the viewpoint of parents in Mashhad, Iran. Materials and Methods: A qualitative study was conducted on a purposive sample of parents seeking emergency dental care for their children during the COVID-19 pandemic. Data were collected through semi-structured face-to-face interviews. The participants were asked, “Were there any barriers encountered when seeking emergency dental care for your child during the COVID-19 pandemic?”. If any barrier was faced, the parents were asked to explain about it. All interviews were recorded and transcribed verbatim. The thematic content analysis of the transcripts began after the first interview, and the interviews and analysis process continued until data saturation was achieved. Results: In total, 26 parents were interviewed. The thematic content analysis of the transcripts led to the recognition of three main categories of barriers: “fear of COVID-19”, “financial constraints”, and “dentists’ less occupational activity”. “fear of COVID-19” had two subcategories: “fear of contracting COVID-19” and “fear of transmitting COVID-19 to others”. “financial constraints” also had two subcategories: “increased costs” and “decreased income”. Conclusion: From the viewpoint of parents seeking emergency dental care for their children in Mashhad, Iran, there were various barriers to the accessibility of emergency pediatric dental care services during the COVID-19 pandemic. The barriers were not limited to the fear of COVID-19 and were partly outside the control of dentists and parents.

目的:本研究旨在从伊朗马什哈德家长的角度调查2019冠状病毒病(COVID-19)大流行期间儿童牙科急诊服务可及性的障碍。材料与方法:对COVID-19大流行期间为孩子寻求紧急牙科护理的父母进行定性研究。数据通过半结构化的面对面访谈收集。参与者被问及:“在COVID-19大流行期间，为孩子寻求紧急牙科护理时是否遇到了任何障碍?”如果遇到任何障碍，家长被要求解释。所有的采访都被逐字记录下来。笔录的专题内容分析在第一次访谈后开始，访谈和分析过程一直持续到数据饱和为止。结果:共采访了26名家长。对笔录进行的专题内容分析确认了三大类障碍:“对COVID-19的恐惧”、“财政限制”和“牙医的职业活动减少”。“对COVID-19的恐惧”有两个子类别:“对感染COVID-19的恐惧”和“对将COVID-19传播给他人的恐惧”。“财政限制”也有两个子类别:“成本增加”和“收入减少”。结论:从伊朗马什哈德为孩子寻求紧急牙科护理的父母的角度来看，在COVID-19大流行期间，儿童获得紧急牙科护理服务存在各种障碍。这些障碍不仅限于对COVID-19的恐惧，而且在一定程度上超出了牙医和父母的控制范围。

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引用次数: 0

Effect of Extent of White Spot Lesions on the Esthetic Outcome After Treatment by the Resin Infiltration Technique: A Clinical Trial 白斑病变范围对树脂浸润技术治疗后美观效果影响的临床研究

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-10-22 DOI: 10.18502/fid.v20i40.13926

Sima Gholami, Alireza Boruziniat, Atoosa Talebi, Yasaman Yazdandoust

Objectives: This study aimed to assess the effect of extent of white spot lesions (WSLs) on the esthetic outcome (masking effect and durability) for 6 months after treatment by the resin infiltration technique. Materials and Methods: In this clinical trial, 79 teeth with WSLs in 18 patients were selected. The lesions were assigned to localized and generalized groups, and were all treated by resin infiltration. The color of WSLs was assessed at baseline, immediately after treatment, and 1, 3, and 6 months after treatment by using Easy Shade spectrophotometer and taking standard digital photographs. The surface area of WSLs was calculated on the photographs using MIP4Student software. Repeated Measures ANOVA was used to compare color change (∆E), and the Pearson’s correlation test was applied to analyze the association between the extent of lesions and ∆E (alpha=0.05). Results: A significant difference was found between the two groups in ∆E at different time points (P<0.05). Also, in both localized and generalized lesions, the pretreatment ∆E was significantly different from the ∆E values at different time points after treatment (P<0.001). However, the post-treatment ∆E values were not significantly different (P>0.05). The Pearson test showed an inverse correlation between the extent of lesions and ∆E (P<0.05). Conclusion: The resin infiltration technique is successful in masking the WSLs, with a durability of at least 6 months. Color correction by this technique is more favorable in localized lesions.

目的:本研究旨在评估树脂浸润技术治疗后6个月白斑病变范围对美学效果(遮蔽效果和持久性)的影响。材料与方法:本临床试验选择18例患者的79颗牙齿。病变分为局部组和全身性组，均采用树脂浸润治疗。使用Easy Shade分光光度计和拍摄标准数码照片，分别在基线、治疗后立即和治疗后1、3、6个月评估白细胞的颜色。利用MIP4Student软件对照片进行了WSLs的表面积计算。采用重复测量方差分析(Repeated Measures ANOVA)比较颜色变化(∆E)，采用Pearson相关检验分析病变程度与∆E的相关性(alpha=0.05)。结果:两组在不同时间点的∆E比较，差异均有统计学意义(p < 0.05)。此外，在局部和广泛性病变中，预处理后的∆E值与治疗后不同时间点的∆E值存在显著差异(P<0.001)。但处理后的∆E值差异无统计学意义(P>0.05)。Pearson检验显示病变范围与∆E呈负相关(P<0.05)。结论:树脂浸润技术可以成功地掩盖WSLs，并且具有至少6个月的耐久性。这种技术对局部病变的颜色校正更有利。

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引用次数: 0

Evaluation of the Effect of Maternal Education on Toddler Dental Plaque Removal Based on a Health Belief Model 基于健康信念模型的母亲教育对幼儿牙菌斑清除效果评价

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-10-15 DOI: 10.18502/fid.v20i38.13878

Alireza Sarraf-Shirazi, Parisa Saharkhiz, Taraneh Movahhed, Alieh Charmeh

Objectives: The objective of this study was to investigate the impact of an educational intervention, guided by the Health Belief Model (HBM), on promoting preventive behaviors among mothers to combat early childhood caries (ECC) in toddlers aged 12 to 18 months. Materials and Methods: This single-blind interventional study evaluated 92 toddlers between 12 to 18 months and their mothers, who were selected by stratified random sampling. Data regarding demographic and nutritional factors were collected using a questionnaire. The dental status of children was evaluated by clinical examination and measuring the plaque index (PI) of maxillary central incisors and the dmfs index. A pamphlet designed according to the HBM was used for oral hygiene instruction in both the intervention and control groups. All of the mothers in the intervention group received a music file to listen to when brushing their children’s teeth. Data were analyzed using chi-square, Fisher exact, Mann-Whitney, and Wilcoxson tests. P<0.05 was considered significant. Results: No significant correlation was noted between the daily frequency of sugary substance intake and primary PI in the intervention or control group with/without dental plaque (P>0.05). In the intervention group, PI significantly decreased after the intervention compared to baseline (P<0.001). However, there was no significant change in PI after the intervention in the control group compared with baseline (P=0.1). Conclusion: The findings indicate that a combination of educational intervention and incentives, such as using age-appropriate music for toddlers, can significantly enhance mothers' effectiveness in removing dental plaque.

目的:本研究的目的是调查健康信念模型(HBM)指导下的教育干预对促进母亲预防12至18个月幼儿龋齿(ECC)的影响。材料与方法:采用分层随机抽样的方法，对92名12 ~ 18个月的幼儿及其母亲进行单盲干预研究。通过问卷调查收集有关人口统计和营养因素的数据。通过临床检查和测量上颌中切牙菌斑指数(PI)和dmfs指数来评价儿童的牙齿状况。根据HBM设计的小册子用于干预组和对照组的口腔卫生指导。干预组的所有母亲在给孩子刷牙时都收到了一份音乐文件。数据分析采用卡方检验、Fisher精确检验、Mann-Whitney检验和Wilcoxson检验。P<0.05被认为是显著的。结果:干预组与对照组(有无牙菌斑)每日摄入含糖物质频率与原发性PI无显著相关(P>0.05)。在干预组，与基线相比，干预后PI显著降低(P<0.001)。然而，与基线相比，对照组干预后PI无显著变化(P=0.1)。结论:研究结果表明，结合教育干预和激励措施，如使用适合幼儿年龄的音乐，可以显著提高母亲去除牙菌斑的效果。

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引用次数: 0

Comparative Evaluation of Application of Universal Bonding on the Microtensile Bond Strength of Light Cure and Dual Cure Composites Bonded to Dentin 光固化与双固化复合材料粘接牙本质微拉伸强度的比较评价

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-10-15 DOI: 10.18502/fid.v20i39.13879

Ebrahim Yarmohamadi, Banafsheh Ahmadi, Maryam Farhadian

Objectives: There is limited knowledge on the efficacy of universal adhesives when used in different etching modes. The aim of this study was to evaluate the microtensile bond strength (µTBS) to dentin using universal adhesives with light-cure and dual-cure composites. Materials and Methods: In this in vitro experimental study, the occlusal third of 60 caries-free human molars were removed and the exposed surfaces were treated and allocated to 10 groups (N=6). Two different bonding agents (Single Bond Universal, G-Premio) were used to bond 2 different composite resins (Z250 light-cure and CoreFlo DC dual-cure) to dentin, using etch-and-rinse (E&R) and self-etch (SE) modes. Single Bond 2 was applied in E&R mode on wet dentin to serve as control. The specimens were sectioned into 1×1 mm2 sticks with a precision saw. A microtensile testing machine was used to measure the µTBS of the specimens with a crosshead speed of 0.5 mm/min. Data were analyzed using three-way ANOVA and Bonferroni post-hoc test (α=0.05). Results: The Single Bond Universal group in SE mode with light-cure composite yielded the highest (39.24MPa), and the G-Premio SE group with dual-cure composite produced the lowest (13.65MPa) mean µTBS (P<0.05). The dominant failure mode was adhesive, in all groups. Conclusion: The bonding agent had a significant effect on µTBS of composite to dentin, but different composites and different etching modes were not significantly different in this respect.

目的:在不同蚀刻模式下使用通用胶粘剂的功效方面的知识有限。本研究的目的是评估使用光固化和双固化复合材料的通用胶粘剂与牙本质的微拉伸结合强度(µTBS)。材料与方法:在体外实验研究中，取出60颗无龋人磨牙的咬合三分之一，处理暴露面，分为10组(N=6)。使用两种不同的粘结剂(Single Bond Universal, G-Premio)将2种不同的复合树脂(Z250光固化和CoreFlo DC双固化)粘合到牙本质上，采用蚀刻-冲洗(E&R)和自蚀刻(SE)模式。将Single Bond 2应用于湿牙本质的E&R模式作为对照。用精密锯将标本切成1×1 mm2的小棒。采用微拉伸试验机测量试件的µTBS，十字头速度为0.5 mm/min。数据分析采用三因素方差分析和Bonferroni事后检验(α=0.05)。结果:Single Bond Universal组SE模式下光固化复合材料产生的平均µTBS最高(39.24MPa)， G-Premio SE模式下双固化复合材料产生的平均µTBS最低(13.65MPa) (P<0.05)。所有组的主要破坏模式均为粘附破坏。结论:粘结剂对复合材料对牙本质的µTBS有显著影响，但不同的复合材料和不同的蚀刻方式在这方面没有显著差异。

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引用次数: 0

Color Stability of Resin Hybrid Ceramic Materials in Comparison to Zirconia-Reinforced Lithium Silicate Ceramic. 树脂杂化陶瓷材料与氧化锆增强硅酸锂陶瓷的颜色稳定性比较。

Q3 Dentistry

Frontiers in Dentistry

Pub Date : 2023-10-01 eCollection Date: 2023-01-01 DOI: 10.18502/fid.v20i37.13742

Reza Eftekhar Ashtiani, Elaheh Beyabanaki, Mahshid Razmgah, Alma Salazar, Marta Revilla-León, Amirali Zandinejad

Objectives: This in vitro study aimed to compare the effect of external staining agents (black tea and grape juice) on the color change of three hybrid ceramics including a new material in comparison to zirconia-reinforced lithium silicate. Materials and Methods: Ten samples of two hybrid dental ceramics including Vita Enamic (Vita Zahnfabrik) and Crystal Ultra (Digital Dental) in addition to a resin nanoceramic, Lava Ultimate (3M ESPE); and a zirconia-reinforced lithium silicate glass ceramic, Vita Suprinity (Vita Zahnfabrik) were prepared and immersed in black tea or grape juice for 30 days. A spectrophotometer was used to evaluate color change. All samples were carefully chosen in A3 shades or their equivalent. Two-way ANOVA and Bonferroni tests were used to analyze the color differences (ΔE00) among the materials and the staining solutions at a significant level of 0.05. Results: Significant color changes were observed in Vita Enamic and Lava Ultimate groups after immersion in both solutions (P<0.001). The least color changes (ΔE00) belonged to the Vita Suprinity (1.34) and Crystal Ultra (1.92) groups, respectively. Conclusion: The color changes of Vita Enamic and Lava Ultimate materials were beyond clinical acceptability. However, the mean color changes of Vita Suprinity and Crystal Ultra groups were clinically acceptable.

目的：本体外研究旨在比较外部染色剂（红茶和葡萄汁）与氧化锆增强硅酸锂相比，对包括一种新材料在内的三种杂化陶瓷颜色变化的影响。材料和方法：两种混合牙科陶瓷的十个样品，包括Vita Enamic（Vita Zahnfabrik）和Crystal Ultra（Digital dental），以及树脂纳米陶瓷Lava Ultimate（3M ESPE）；和氧化锆增强的硅酸锂玻璃陶瓷Vita Suprinity（Vita Zahnfabrik），并在红茶或葡萄汁中浸泡30天。使用分光光度计来评估颜色变化。所有样品都是经过仔细挑选的A3色调或同等色调。使用双向ANOVA和Bonferroni检验来分析材料和染色溶液之间的色差（ΔE00），其显著水平为0.05。结果：Vita-Enamic组和Lava Ultimate组在浸泡两种溶液后均观察到显著的颜色变化（P结论：Vita Enamic和Lava Ultimate材料的颜色变化超出了临床可接受范围，但Vita-Suprinity和Crystal Ultra组的平均颜色变化在临床可接受。

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