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Citric Acid in Endodontics: A Review 柠檬酸在牙髓学中的应用综述
Pub Date : 2021-11-03 DOI: 10.22038/JDMT.2021.56002.1430
Z. Mohammadi, J. Kinoshita, S. Shalavi, A. Mokhber, H. Jafarzadeh
Naturally occurring in citrus fruits, citric acid is categorized as a weak organic acid, which may exist both as a monohydrate or in an anhydrous form. In biochemistry, this organic acid acts as an intermediate in an essential metabolic process in all aerobic organisms called the Krebs cycle. The literature on citric acid in the context of endodontics up to June 2020 was reviewed using PubMed and MEDLINE. This review aimed to address the antibacterial efficacy of citric acid on endodontic microbiota, its effectiveness on the smear layer, the effects of its toxicity on fracture resistance of dentin, as well as the effectiveness of this acid on the removal of intra-canal medicaments. This report also addressed citric acid-containing endodontic irrigants.
柠檬酸天然存在于柑橘类水果中,被归类为弱有机酸,可能以一水或无水形式存在。在生物化学中,这种有机酸在所有有氧生物的一个叫做克雷布斯循环的基本代谢过程中起着中间作用。截至2020年6月,使用PubMed和MEDLINE对牙髓学中柠檬酸的文献进行了综述。本文就柠檬酸对牙本质微生物群的抑菌作用、对牙本质涂片层的抑菌作用、对牙本质抗骨折的毒性影响以及对管内药物清除的影响等方面进行综述。本报告还讨论了含柠檬酸的根管冲洗剂。
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引用次数: 0
The Evaluation of the Effect of Coffee Staining and 16% Carbamide Peroxide Bleaching on the Color Change of Chairside CAD/CAM Ceramics 咖啡染色和16%过氧化脲漂白对椅子边CAD/CAM陶瓷颜色变化的影响
Pub Date : 2021-11-01 DOI: 10.22038/JDMT.2021.55388.1422
G. Sağlam, S. Cengiz
Introduction: The aim of this study was to evaluate the effect of coffee staining and home bleaching agent on the color stability of stained CAD/CAM ceramics.Methods: Forty specimens were prepared from feldspathic ceramic (CEREC Blocs) and hybrid nano-ceramic (Cerasmart) CAD/CAM blocks (N=40). The polished specimens were ultrasonically cleaned in distilled water and then, immersed in coffee for seven days. The stained specimens were divided into four subgroups (n=10) according to their type of ceramic and bleaching treatment; CEREC control, CEREC bleaching, Cerasmart control and, Cerasmart bleaching. The home bleaching agent (Opalescence PF 16%)  was applied to specimens of bleaching groups for seven days. Control groups did not take any bleaching procedure and were placed in distilled water during this period. Then the specimens were immersed in coffee for seven days again for staining susceptibility. CIELAB parameters were recorded at four times; initial color, 1-week coffee staining, after bleaching, and coffee staining after bleaching with a dental spectrophotometer (VITA Easyshade). Color changes between each step were calculated as ΔE values. The data were statistically analyzed with t-test and Kruskal Wallis test. Results: After 1-week coffee staining the highest ΔE values were obtained from Cerasmart (p<0.001). The bleached Cerasmart group showed significantly higher color change values compared to Cerasmart control and both CEREC groups (P<0.05). No significant differences were found between control and bleached groups in both Cerasmart and CEREC groups after coffee immersion.Conclusion: Coffee staining and 16% carbamide peroxide bleaching significantly influenced the color of resin ceramic CAD/CAM materials.
摘要本研究的目的是评价咖啡染色和家用漂白剂对染色CAD/CAM陶瓷颜色稳定性的影响。方法:采用长石陶瓷(CEREC blocks)和混合纳米陶瓷(Cerasmart) CAD/CAM块(N=40)制备40例标本。抛光后的标本在蒸馏水中进行超声波清洗,然后浸泡在咖啡中7天。染色标本按陶瓷类型和漂白处理方式分为4个亚组(n=10);CEREC控制,CEREC漂白,Cerasmart控制和Cerasmart漂白。漂白组用家用漂白剂(乳白PF 16%)处理7天。在此期间,对照组没有采取任何漂白程序,并将其置于蒸馏水中。再用咖啡浸泡7天,观察染色敏感性。记录四次CIELAB参数;初始颜色,漂白后1周咖啡染色,漂白后用牙分光光度计(VITA Easyshade)进行咖啡染色。每一步之间的颜色变化计算为ΔE值。数据采用t检验和Kruskal Wallis检验进行统计学分析。结果:1周咖啡染色后,Cerasmart的ΔE值最高(p<0.001)。Cerasmart漂白组与Cerasmart对照组及CEREC两组相比,颜色变化值显著升高(P<0.05)。在咖啡浸泡后,Cerasmart组和CEREC组在对照组和漂白组之间没有发现显著差异。结论:咖啡染色和16%过氧化脲漂白对树脂陶瓷CAD/CAM材料的颜色有显著影响。
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引用次数: 2
Evaluation of the Polymerization Properties of Bulk-Fill Composite Resins 本体填充复合树脂聚合性能的评价
Pub Date : 2021-09-01 DOI: 10.22038/JDMT.2021.57660.1443
L. Uygun, N. Akgül
Introduction: The aim was to evaluate the polymerization properties of bulk-fill composite resins in terms of the degree of conversion (%DC), Vickers hardness (HV). SonicFill (SF, Kerr, CA, USA), Tetric Evo Ceram Bulk-Fill (TECBF, Ivoclar Vivadent Schaan, Lichtenstein), and X-trafil (XTF, Voco GmbH, Cuxhaven, Germany) were investigated. Methods: The samples prepared from composites (n = 10)  were polymerized via three different curing modes (standard mode: 20 s, high-power mode: 12 s, extra power mode: 6 s) using a polywave LED. %DC was determined by FTIR-ATR-spectroscopy. HV was measured at the top and bottom of the specimens. Data were analyzed by two way ANOVA, and Bonferroni’s post-hoc respectively (α=0.05). Results: Except TECBF (%41.10 ± 3.1) in three different curing modes, all materials showed no significant inferior %DC. In all curing modes, the highest hardness ratio was found in XTF (0.84 ± 0.03 GPa), and the lowest hardness ratio was found in the TECBF (0.78 ± 0.02GPa). In the cases where the extra power mode of the Valo Led was applied, the lowest degree of conversion and hardness were also measured. Conclusion: It has been observed that the examined properties of some tested materials change with the curing time and power of the light and however, the results are dependent on the material.Extra power mode of the Valo Led negatively affected high viscosity bulk-fill composites in terms of their polymerization properties
前言:目的是根据转化率(%DC)、维氏硬度(HV)来评价本体填充复合树脂的聚合性能。对SonicFill (SF, Kerr, CA, USA), Tetric Evo Ceram Bulk-Fill (TECBF, Ivoclar Vivadent Schaan,列支敦士登)和X-trafil (XTF, Voco GmbH, Cuxhaven, Germany)进行了研究。方法:采用多波LED对n = 10的复合材料进行三种不同固化模式(标准模式:20 s,大功率模式:12 s,超功率模式:6 s)的聚合。用ftir - atr光谱法测定%DC。在样品的顶部和底部测量HV。数据分别采用双因素方差分析(two - way ANOVA)和Bonferroni事后分析(α=0.05)。结果:三种不同固化方式下,除TECBF(%41.10±3.1)外,其余材料DC均无明显下降。在所有固化方式中,XTF的硬度比最高(0.84±0.03 GPa), TECBF的硬度比最低(0.78±0.02GPa)。在使用Valo Led的额外电源模式的情况下,还测量了最低转换程度和硬度。结论:观察到某些被测材料的被测性能随光固化时间和功率的变化而变化,但结果与材料有关。Valo Led的额外功率模式对高粘度体填料复合材料的聚合性能产生了负面影响
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引用次数: 0
The Effect of Linear and Angular Midline Deviation on Smile Attractiveness Regarding Facial Height 线状和角状中线偏差对面部高度微笑吸引力的影响
Pub Date : 2021-09-01 DOI: 10.22038/JDMT.2021.56944.1439
Behrad Tanbakuchi, Sepideh Arab, E. A. Niaki, Mohamad Moslem Imani, S. Valizadeh, A. Shamshiri
Introduction: The aim of the present study was to evaluate ordinary people`s perception about smile attractiveness in long face and short face subjects with linear and angular midline deviations. Methods: Frontal facial smiling images of two young Iranian females (one short face and one long face) were manipulated by Adobe Photoshop CS3 software. Four photos with different linear midline deviations to right (1mm, 2mm, 3mm and 4mm) and four photos with counter clockwise angular midline deviation (2˚, 6˚, 10˚, 14˚) were produced. Sixty Iranian individuals (30 males and 30 females) were asked to determine from which photo on, they found that the smile is unattractive. Results: Unlike angular midline deviation, there was no statistically significant difference in the acceptability limitation for linear midline deviation between long face and short face subjects. The mean of unattractive limitation for angular midline deviation was 8.44˚ and 6.56˚ in long face and short face subjects, respectively. No statistically significant differences were found in ratings between male and female examiners. Conclusion: Angular midline deviation is more acceptable in long face people. On the other hand, the attractiveness of the two facial types is similarly affected by linear midline deviation
摘要本研究的目的是评估普通人对长脸和短脸受试者在中线和角中线偏差下的微笑吸引力的感知。方法:采用Adobe Photoshop CS3软件对2名伊朗年轻女性(1短脸1长脸)的正面面部微笑图像进行处理。制作了4张中线向右偏离不同方向(1mm、2mm、3mm、4mm)的照片和4张中线向右偏离方向(2˚、6˚、10˚、14˚)的照片。60名伊朗人(30名男性和30名女性)被要求判断哪张照片上的笑容不吸引人。结果:与角中线偏差不同,长脸与短脸受试者对直线中线偏差的可接受限度无统计学差异。长脸和短脸受试者的角中线偏差无吸引力限制均值分别为8.44˚和6.56˚。男女考官的评分没有统计学上的显著差异。结论:长脸人群对中线角度偏差更容易接受。另一方面,两种面部类型的吸引力同样受到线性中线偏差的影响
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引用次数: 1
Comparative Evaluation of Cytotoxicity of Fluoride Varnish as Root Canal Sealer against L929 Mouse Fibroblasts with Conventional Endodontic Sealers 氟化物清漆作为根管封闭剂对L929小鼠成纤维细胞的细胞毒性与常规根管封闭剂的比较
Pub Date : 2021-09-01 DOI: 10.22038/JDMT.2021.48368.1372
Erfan Hosseini, Mahdi Lomee, J. Charati, Abolfazl Hosseinnataj, Salma Omidi
Introduction: This study aimed to assess the cytotoxicity of Duraflur fluoride varnish as root canal sealer against L929 mouse fibroblasts in comparison with four commonly used conventional endodontic sealers in the first 48 hours of exposure. Methods: In this in vitro, experimental study, L929 mouse fibroblasts were exposed to 1/1, ½, ¼ , and 1/8 concentrations of Duraflur fluoride varnish, AH Plus, Fill Canal, MTA Fillapex, and AH26 sealers. After 48 hours, the methyl thiazolyl tetrazolium (MTT) assay was performed to assess the cytotoxicity of sealers. Cell viability was determined as the percentage of viable cells compared with the control group. The results were analyzed using one-way ANOVA followed by the Tukey’s post hoc test for multiple comparisons.. Results: MTA Fillapex had the lowest and AH26 had the highest cytotoxicity (p <0.05). Fluoride varnish showed high cell viability in 1/8 concentration (91.09%). Its cytotoxicity was close to that of AH Plus with no significant difference (P=0.49) but it had higher cytotoxicity than Fill Canal and Fill Apex (p <0.05). Fluoride varnish in 1/1 and 1/8 concentrations showed significantly higher cell viability than AH26 (p <0.001). Conclusion: Fluoride varnish sealer has acceptable biocompatibility comparable to that of conventional sealers. It has lower cytotoxicity than AH26.
本研究旨在评估Duraflur氟化清漆作为根管密封剂对L929小鼠成纤维细胞的细胞毒性,并与四种常用的传统根管密封剂进行比较。方法:在体外实验研究中,L929小鼠成纤维细胞暴露于1/1、1/ 2、1/ 4和1/8浓度的Duraflur氟化物清漆、AH Plus、Fill Canal、MTA Fillapex和AH26密封剂中。48小时后,采用甲基噻唑四氮唑(MTT)法评估封耳鼠的细胞毒性。细胞活力测定为与对照组相比存活细胞的百分比。结果采用单因素方差分析,然后采用Tukey’s事后检验进行多重比较。结果:MTA Fillapex的细胞毒性最低,AH26的细胞毒性最高(p <0.05)。氟化物清漆在1/8浓度时具有较高的细胞存活率(91.09%)。其细胞毒性与AH Plus接近,差异无统计学意义(P=0.49),但其细胞毒性高于填充管和填充尖(P <0.05)。1/1和1/8氟清漆的细胞活力显著高于AH26 (p <0.001)。结论:氟化物清漆与常规封口剂相比具有良好的生物相容性。它具有比AH26更低的细胞毒性。
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引用次数: 0
The Comparison of Styloid Processes in the Edentulous and the Posterior Dentate Patients Using Panoramic Radiography 无牙和后牙患者茎突的全景x线摄影比较
Pub Date : 2021-09-01 DOI: 10.22038/JDMT.2021.54459.1409
N. Dedeoğlu, G. Eşer, O. Altun
Introduction: The aim of this study was to evaluate the length of styloid processes of edentulous and posterior dentate patients retrospectively using digital panoramic radiography. Methods: This study was carried out in southwestern of eastern Anatolia region Turkish population. In this study, 100 styloid processes of each of edentulous and posterior dentate patients were measured on digital panoramic radiographs. Styloid process longer than 30 mm was evaluated as an elongated styloid process. Recording of data was performed based on gender, side and groups, Chi-square and Mann Whitney U test were conducted for statistical analysis. Results: Styloid process length was not found to be statistically significant between edentulous (24.9±6.66) and posterior dentate (25.75±5.64) groups (p˃0.05). The frequencies of Elongated styloid processes were not statistically different between genders, side or groups (p˃0.05). Conclusion: Being edentulous was not an important factor for the length of the styloid process and the likelihood of symptoms that might develop.
简介:本研究的目的是利用数字全景x线摄影回顾性评估无牙和后牙患者茎突的长度。方法:本研究在东安纳托利亚地区西南部的土耳其人群中进行。本研究在数字全景x线片上测量无牙和后牙患者各100个茎突。茎突长度大于30毫米的被评价为细长茎突。数据按性别、侧面、分组进行记录,采用卡方检验和Mann Whitney U检验进行统计分析。结果:无牙组(24.9±6.66)与后牙组(25.75±5.64)茎突长度比较,差异无统计学意义(p > 0.05)。茎突伸长频率在性别、侧面、组间差异无统计学意义(p < 0.05)。结论:无牙并不是影响茎突长度和出现症状可能性的重要因素。
{"title":"The Comparison of Styloid Processes in the Edentulous and the Posterior Dentate Patients Using Panoramic Radiography","authors":"N. Dedeoğlu, G. Eşer, O. Altun","doi":"10.22038/JDMT.2021.54459.1409","DOIUrl":"https://doi.org/10.22038/JDMT.2021.54459.1409","url":null,"abstract":"Introduction: The aim of this study was to evaluate the length of styloid processes of edentulous and posterior dentate patients retrospectively using digital panoramic radiography. Methods: This study was carried out in southwestern of eastern Anatolia region Turkish population. In this study, 100 styloid processes of each of edentulous and posterior dentate patients were measured on digital panoramic radiographs. Styloid process longer than 30 mm was evaluated as an elongated styloid process. Recording of data was performed based on gender, side and groups, Chi-square and Mann Whitney U test were conducted for statistical analysis. Results: Styloid process length was not found to be statistically significant between edentulous (24.9±6.66) and posterior dentate (25.75±5.64) groups (p˃0.05). The frequencies of Elongated styloid processes were not statistically different between genders, side or groups (p˃0.05). Conclusion: Being edentulous was not an important factor for the length of the styloid process and the likelihood of symptoms that might develop.","PeriodicalId":15640,"journal":{"name":"Journal of Dental Materials and Techniques","volume":"9 1","pages":"142-147"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82522895","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
Intentional Replantation: an Approach to Save Hopeless Natural Teeth (A Case Report) 有意再植:一种挽救无望天然牙的方法(附一例报告)
Pub Date : 2021-09-01 DOI: 10.22038/JDMT.2021.48964.1373
Soheila Darmiani, S. Ebrahimipour
Introduction: Non-surgical endodontic retreatment and surgical endodontic therapy may not be practical for the treatment of endodontic diseases. Intentional replantation is considered as a procedure of last resort when nonsurgical or surgical endodontics is contraindicated. Case report: A 35 year- old female attended the endodontist office with pain and apical lesion in endodontically treated tooth ≠47. Access preparation for retreatment is a problem due to the posts and crown and surgical endodontic therapy was limited by anatomical features including nerve proximity and bone thickness. In addition, the patient could not afford to pay for non-surgical re-treatment or implant therapy Conclusion: This report demonstrates intentional replantation as a treatment that can be considered when other options such as endodontic retreatment or apical surgery are impossible.
介绍:对于治疗牙髓疾病,非手术治疗和手术治疗可能不太现实。当非手术或手术牙髓治疗禁忌时,故意再植被认为是最后的手段。病例报告:一名35岁女性,因牙髓治疗后牙根尖病变及疼痛≠47就诊于牙髓科。再治疗的通路准备是一个问题,因为桩和冠,手术治疗受到解剖学特征的限制,包括神经邻近和骨厚度。结论:本报告表明,当无法进行根管再治疗或根尖手术等其他治疗方法时,可以考虑有意再植。
{"title":"Intentional Replantation: an Approach to Save Hopeless Natural Teeth (A Case Report)","authors":"Soheila Darmiani, S. Ebrahimipour","doi":"10.22038/JDMT.2021.48964.1373","DOIUrl":"https://doi.org/10.22038/JDMT.2021.48964.1373","url":null,"abstract":"Introduction: Non-surgical endodontic retreatment and surgical endodontic therapy may not be practical for the treatment of endodontic diseases. Intentional replantation is considered as a procedure of last resort when nonsurgical or surgical endodontics is contraindicated. Case report: A 35 year- old female attended the endodontist office with pain and apical lesion in endodontically treated tooth ≠47. Access preparation for retreatment is a problem due to the posts and crown and surgical endodontic therapy was limited by anatomical features including nerve proximity and bone thickness. In addition, the patient could not afford to pay for non-surgical re-treatment or implant therapy Conclusion: This report demonstrates intentional replantation as a treatment that can be considered when other options such as endodontic retreatment or apical surgery are impossible.","PeriodicalId":15640,"journal":{"name":"Journal of Dental Materials and Techniques","volume":"69 1","pages":"173-177"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72811719","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
A Review on Root Canal Irrigation Solutions in Endodontics 根管冲洗技术在牙髓学中的研究进展
Pub Date : 2021-08-14 DOI: 10.22038/JDMT.2021.56003.1431
Z. Mohammadi, S. Shalavi, J. Kinoshita, L. Giardino, J. Gutmann, S. B. Rad, C. Udoye, H. Jafarzadeh
Introduction: This paper aims to review the different characteristics of root canal irrigants including sodium hypochlorite (NaOCl), chlorhexidine (CHX), hydrogen peroxide (H2O2), iodine potassium iodide (IKI), antibiotic-based irrigants, photo-activated disinfection, electrochemically activated water, and QMix. The literature on root canal irrigation solutions in the context of endodontics up to June 2020 was reviewed using PubMed and MEDLINE. NaOCl was identified as the most likely effective irrigation solution that could be used for endodontics. Its antimicrobial activity is at least comparable or even greater than that of other common irrigants. Tetraclean was also proposed to be more effective than CHX against endodontic microorganisms. In addition, Hypoclean was suggested as the most potent and effective irrigant against Candida albicans. Similarly, IKI was introduced as a successful irrigant in killing Candida albicans and Enterococcus faecalis. MTAD is also known to be effective in smear layer removal as well as against the growth of Enterococcus faecalis. EDTA is also considered to have limited antimicrobial activity.
本文综述了次氯酸钠(NaOCl)、氯己定(CHX)、过氧化氢(H2O2)、碘化钾(IKI)、抗生素型根管冲洗剂、光活化消毒、电化学活化水和QMix等根管冲洗剂的不同特性。截至2020年6月,使用PubMed和MEDLINE对牙髓学背景下的根管灌洗液文献进行了回顾。NaOCl被认为是最有可能用于牙髓学的有效冲洗液。其抗菌活性至少与其他普通冲洗液相当,甚至更强。此外,四环精对牙髓微生物的抑制效果也优于CHX。此外,本研究还认为Hypoclean是抗白色念珠菌最有效的冲洗剂。同样,IKI作为一种成功的冲洗剂被引入,用于杀死白色念珠菌和粪肠球菌。众所周知,MTAD在去除涂抹层以及对抗粪肠球菌生长方面也很有效。EDTA也被认为具有有限的抗菌活性。
{"title":"A Review on Root Canal Irrigation Solutions in Endodontics","authors":"Z. Mohammadi, S. Shalavi, J. Kinoshita, L. Giardino, J. Gutmann, S. B. Rad, C. Udoye, H. Jafarzadeh","doi":"10.22038/JDMT.2021.56003.1431","DOIUrl":"https://doi.org/10.22038/JDMT.2021.56003.1431","url":null,"abstract":"Introduction: This paper aims to review the different characteristics of root canal irrigants including sodium hypochlorite (NaOCl), chlorhexidine (CHX), hydrogen peroxide (H2O2), iodine potassium iodide (IKI), antibiotic-based irrigants, photo-activated disinfection, electrochemically activated water, and QMix. The literature on root canal irrigation solutions in the context of endodontics up to June 2020 was reviewed using PubMed and MEDLINE. NaOCl was identified as the most likely effective irrigation solution that could be used for endodontics. Its antimicrobial activity is at least comparable or even greater than that of other common irrigants. Tetraclean was also proposed to be more effective than CHX against endodontic microorganisms. In addition, Hypoclean was suggested as the most potent and effective irrigant against Candida albicans. Similarly, IKI was introduced as a successful irrigant in killing Candida albicans and Enterococcus faecalis. MTAD is also known to be effective in smear layer removal as well as against the growth of Enterococcus faecalis. EDTA is also considered to have limited antimicrobial activity.","PeriodicalId":15640,"journal":{"name":"Journal of Dental Materials and Techniques","volume":"25 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72746058","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: 1
Evaluation and Comparison of the Vertical Marginal Discrepancy of Ni-Cr and Co-Cr Alloys Before and After Porcelain Firing: An in Vitro Study 烤瓷前后Ni-Cr和Co-Cr合金垂直边缘差异的体外评价与比较
Pub Date : 2021-07-17 DOI: 10.22038/JDMT.2021.55664.1428
R. Kulkarni, D. Jain, Aalap Prajapati, Poonam R Kulkarni
Introduction: Marginal seal is the critical factor for the success of any restoration. Accuracy of marginal seal of copings depends on alloy systems & manufacturing techniques. In every technique like laser sintered, conventional casting etcetera, significant marginal discrepancy takes place after porcelain firing. The aim of this study is to evaluate and compare the vertical marginal discrepancy of Ni-Cr and Co-Cr alloys before and after porcelain firing. Methods: Custom made stainless steel die model was prepared to simulate the dimensions of the mandibular molar with a round shoulder margin. Cast copings of two base metal alloys Ni-Cr alloy & Co-Cr alloy were prepared. Total 40 copings were made and divided into two groups, G1 (Ni-Cr alloy) & G2 (Co-Cr alloy). According to alloy type, 20 specimens were used for each group of the study. The vertical discrepancy was measured with an optical LASER microscope (Nikon, Japan) before and after application of porcelain on the copings. Wilcoxon signed ranked test and Mann Whitney U test were used for Statistical analysis. Results: The median vertical marginal discrepancy before and after porcelain firing for Ni-Cr alloy was 48.13 and 52.87 um respectively and for Co-Cr alloy was 95.33 and 100.04 um respectively. There is a highly significant difference (P < 0.001) in the median vertical marginal discrepancy between Co-Cr alloy copings & Ni-Cr alloy copings before & after porcelain firing. Conclusions: Co-Cr alloy PFM restorations have double vertical marginal discrepancy compared to Ni-Cr alloy restorations but both the values can be considered within clinical acceptability range of the marginal discrepancy.
边缘密封是任何修复成功的关键因素。镀层边缘密封的精度取决于合金系统和制造技术。在每一种技术,如激光烧结,传统铸造等,显著的边际差异后,瓷烧制。本研究的目的是评估和比较Ni-Cr和Co-Cr合金在瓷烧成前后的垂直边缘差异。方法:制作定制不锈钢模具模型,模拟圆肩缘下颌磨牙的尺寸。制备了Ni-Cr合金和Co-Cr合金两种贱金属合金的铸件。共制作40个涂层,分为G1组(Ni-Cr合金)和G2组(Co-Cr合金)。根据合金类型,每组选用20个试样。用光学激光显微镜(Nikon, Japan)测量了涂瓷前后的垂直差异。采用Wilcoxon符号排序检验和Mann Whitney U检验进行统计分析。结果:Ni-Cr合金烧瓷前后的中位垂直边缘差分别为48.13和52.87 um, Co-Cr合金烧瓷前后的中位垂直边缘差分别为95.33和100.04 um。烧瓷前后Co-Cr合金和Ni-Cr合金的中位垂直边缘差有极显著差异(P < 0.001)。结论:Co-Cr合金烤瓷修复体与Ni-Cr合金烤瓷修复体相比存在双垂直边缘差值,但两者均可考虑在临床可接受的边缘差值范围内。
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引用次数: 0
Bilateral Simultaneous Sinus and Nasal Floor Augmentation in Severe Atrophic Maxilla: a Case Report 双侧鼻窦及鼻底同时增强术治疗严重上颌骨萎缩1例
Pub Date : 2021-07-17 DOI: 10.22038/JDMT.2021.53395.1399
M. Shokri, Rozhin Aali, Zeinab Bakhtiari
Introduction: One of the most challenging cases in implantology is severely atrophic alveolar ridges which do not have adequate bone for implant placement. One common treatment option for dealing with this challenge is LeFort I osteotomy with inlay bone graft which allows implant insertion and correction of the maxillomandibular relationship simultaneously. Although this method has a high success rate, it is somewhat invasive and has potential complications in some cases. In recent decades, implant surgeons have focused on less invasive and more predictable treatment options for bone augmentation and implant rehabilitation. Now a question comes into mind when there are not much discrepancies in maxillomandibular skeletal relationship and inter arch distance, do we really need LeFort I down-grafting and take its risks? Methods: In this study, we present a case who did not need any change in the skeletal relationship of the jaws and inter arch space based on examination and prosthetic consultation, so we implemented bilateral simultaneous sinus and nasal floor augmentation instead of LeFort 1 interpositional inlay bone graft. Results: Six months after the surgery, new radiography showed adequate height and width of augmented bones gained in and under sinuses and nose floor. So there is no limitation on choosing suitable implant lengths and diameters. Conclusion: This study indicated successful augmentation of severely resorbed maxillary alveolar ridge with bilateral sinus and nose floor grafting technique instead of LeFort I interpositional bone graft in a case who didn’t have more discrepancies in skeletal and inter arch space.
简介:种植学中最具挑战性的病例之一是严重萎缩的牙槽嵴,没有足够的骨来放置种植体。应对这一挑战的一种常见治疗选择是LeFort I型截骨术和嵌体骨移植物,可以同时植入种植体和矫正上下颌关系。虽然这种方法成功率高,但在某些情况下有一定的侵入性和潜在的并发症。近几十年来,种植外科医生一直专注于微创和更可预测的骨增强和种植体康复治疗方案。现在有一个问题出现了,在上颌骨骨骼关系和弓间距离没有太大差异的情况下,我们真的需要LeFort I下植骨并承担风险吗?方法:在本研究中,我们报告了一个病例,根据检查和假体咨询,不需要改变颌骨骨骼关系和弓间空间,因此我们采用双侧同步鼻窦和鼻底增强术代替LeFort 1间位嵌体骨移植。结果:术后6个月,新的x线片显示鼻窦和鼻底内、下骨骼增加了足够的高度和宽度。因此,选择合适的种植体长度和直径是没有限制的。结论:采用双侧鼻窦及鼻底植骨技术代替LeFort I间位骨移植,在骨与弓间间隙差异较小的情况下,成功地增加了重度吸收的上颌牙槽嵴。
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引用次数: 0
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Journal of Dental Materials and Techniques
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