Egyptian dental journal最新文献_第8页

In Vitro Investigation of Marginal & Internal Adaptation of Two Screw-Retained Implant Supported Crowns: A Comparative Analysis of Direct Optical & Subtractive Reverse Engineering Techniques. 两种螺钉固位种植牙冠边缘和内部适应性的体外研究：直接光学和减法逆向工程技术的对比分析

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.288919.3037

Heba Ismail, M. Wahsh, A. Aboelfadl, Ingy Nouh

{"title":"In Vitro Investigation of Marginal & Internal Adaptation of Two Screw-Retained Implant Supported Crowns: A Comparative Analysis of Direct Optical & Subtractive Reverse Engineering Techniques.","authors":"Heba Ismail, M. Wahsh, A. Aboelfadl, Ingy Nouh","doi":"10.21608/edj.2024.288919.3037","DOIUrl":"https://doi.org/10.21608/edj.2024.288919.3037","url":null,"abstract":"Objectives: The aim of this in-vitro study was to investigate the marginal and internal adaptation of two screw-retained crowns; lithium disilicate and BioHPP using direct optical and subtractive reverse engineering techniques and to calculate the degree of agreement between them. Materials & Methods: Twenty-eight implant analogs were embedded perpendicularly in an auto-polymerizing resin. Implant-supported restorations were designed then milled with CAD wax and divided into 2 groups according to material (n=14): Lithium disilicate and BioHPP. Each group was pressed according to the manufacturer’s instructions. The marginal and internal adaptation of the specimens were analyzed using DOT & subtractive RET. Data were explored for normality using Shapiro-Wilk’s and Levene’s tests and were analyzed using independent and paired t-test for inter and intragroup comparisons respectively with a significance level of p<0.05. Agreement analysis was done using intraclass correlation coefficient (ICC). Results: BioHPP screw-retained implant-supported crowns showed higher marginal gap than lithium disilicate, yet the difference was non-significant when measured using DOT, while it was significant when measured using sRET. Calculated agreement between the two techniques at the marginal level showed that there was a statistically significant moderate agreement between both methods. Regarding internal adpatation, BioHPP had a statistically significant higher internal gap than lithium disilicate group. Conclusions: Supra-structure material affected marginal and internal adaptation of implant-supported restorations. Pressed lithium disilicate crowns showed better marginal and internal adaptation than BioHPP crowns, however, both groups showed clinically acceptable results. DOT and RET were both relevant and showed moderate agreement between them.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"15 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141702272","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

IN-VITRO RETENTION OF HIGH ARCHED MAXILLARY DENTURES CONSTRUCTED FROM CONVENTIONAL, THERMOFORMED, AND MILLED CAD/CAM RESINS. 用传统树脂、热成型树脂和研磨CAD/CAM树脂制作的高拱形上颌假牙的体外固位。

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.268628.2931

abdullah Ismael Ahmed, Hussein Abdelhady Hussein Taha, Ahmed sholkamy abdelazeem, Dina Bahgat El talawy, E. M. Tolba

{"title":"IN-VITRO RETENTION OF HIGH ARCHED MAXILLARY DENTURES CONSTRUCTED FROM CONVENTIONAL, THERMOFORMED, AND MILLED CAD/CAM RESINS.","authors":"abdullah Ismael Ahmed, Hussein Abdelhady Hussein Taha, Ahmed sholkamy abdelazeem, Dina Bahgat El talawy, E. M. Tolba","doi":"10.21608/edj.2024.268628.2931","DOIUrl":"https://doi.org/10.21608/edj.2024.268628.2931","url":null,"abstract":"Purpose: this study was to evaluate the retention of high-arched maxillary dentures constructed from conventional, thermoformed, and milled CAD/CAM resins. Materials and Methods: An edentulous patient with a high-arched palate was selected from the outpatient clinic, Department of Prosthetic Dentistry, Faculty of Dentistry, Minia University. The patient was seeking complete denture treatment. Using the master cast in this case, thirty stone casts were duplicated, numbered, and randomly allocated to one of three study groups of 10 casts each. Thirty denture bases were constructed from the following materials to be as identical as possible: 10 of each of the following materials: conventional heat-cured resin, thermoformed resin, and milling resin by CAD/CAM. The retention of the produced denture bases was tested using a universal testing machine. Results : The thermoformed group displayed the highest numeric retention mean (5.576 N), followed by CAD/CAM (4.888 N) and the conventional method (3.232 N). There were statistically significant differences between all groups. Conclusions: Within the limitations of this in vitro study, it may be concluded that the thermoformed resin may be the most suitable material for high-arched palates, followed by CAD-CAM materials. The conventional technique in this case is less recommended.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"25 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141698194","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

Evaluation of retention values of different telescopic crown attachment materials in implant retained overdenture (an in vitro study) 不同伸缩冠连接材料在种植体固位覆盖义齿中的固位值评估（体外研究）

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.288610.3035

Sherif Mohamed Abdel Hamid, Rim Adel Selima, Mohamed Zaki Basiony

{"title":"Evaluation of retention values of different telescopic crown attachment materials in implant retained overdenture (an in vitro study)","authors":"Sherif Mohamed Abdel Hamid, Rim Adel Selima, Mohamed Zaki Basiony","doi":"10.21608/edj.2024.288610.3035","DOIUrl":"https://doi.org/10.21608/edj.2024.288610.3035","url":null,"abstract":"Statement of problem : A variety of attachment materials were employed to improve stability and retention; nevertheless, some materials show considerable alterations in surface topography upon the application of occlusal stress, which eventually affects denture retention. Recent studies have shown a substantial amount of interest in the usage of metal-free attachment. Purpose: the aim of this study was examining the impact of various telescopic crown attachment materials on implant-retained mandibular overdentures’ retention. Material and Methods : completely edentulous mandibular epoxy models were constructed; wherein various material combinations have been used for constructing telescopic attachments for two implants placed in the canine area. The traditional standardized method was used to fabricate thirty-three identical mandibular overdentures. Based on the material utilized in constructing the secondary coping, the study groups were divided into three categories: PEEK/PEEK, PEEK/ZrO 2 , and PEEK/CoCr. For each research group, primary PEEK copings were created. On a prefabricated abutment, primary copings were cemented in place. In the intended insertion path, secondary copings were positioned over the primary copings and then lifted up into the overdentures’ intaglio surface. In order to","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"9 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141698258","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

Influence of Implant Inclination on Peri-Implant Bone Stress associated in Mandibular Three Implant Overdentures: A Finite Element Analysis 种植体倾斜度对下颌三种植体覆盖义齿种植体周围骨应力的影响：有限元分析

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.276457.2978

A. Emarah, Nasser Zaki Ahmed, Mostafa Aldesoki, Kamal Ghamry Metwally, Amr Salah el-din Gomaa

{"title":"Influence of Implant Inclination on Peri-Implant Bone Stress associated in Mandibular Three Implant Overdentures: A Finite Element Analysis","authors":"A. Emarah, Nasser Zaki Ahmed, Mostafa Aldesoki, Kamal Ghamry Metwally, Amr Salah el-din Gomaa","doi":"10.21608/edj.2024.276457.2978","DOIUrl":"https://doi.org/10.21608/edj.2024.276457.2978","url":null,"abstract":"Purpose: This study addresses stress distribution in the peri-implant bone of mandibular overdentures supported by there implants with different inclinations. Materials and methods: Three separate 3D FE models were prepared to simulate mandibular implant overdentures with ball attachments. Each model was modified according to distal implant’s inclination (0, 15, and 25 degrees), while the midline implant was kept straight. Four loads were applied to the denture: clench, masseter, pterygoid, and temporal loads. The behavioral characteristics of the peri-implant bone and the implants were studied and recorded under the applied loads for the three implant inclinations. Results: According to the study, the stress distribution in the mandible varied depending on the implant inclination. The maximum stress observed on the mandible ranged from 19.1 to 36.1 MPa across all cases studied. As the implant inclination increased, the maximum stress and strain increased in both the mandible and implants. However, the rate of increase was found to be less pronounced at higher fixation angles. Conclusion: These findings suggest that implant inclination should be carefully considered to minimize stress and strain on the mandible and implants during treatment planning for implant-supported overdentures.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"54 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141712658","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

Possible Effects of nutmeg oil versus propolis in treatment of chemical induced ulcer on papillae of tongue in albino rats. (Histological and Scanning Electron Microscopic study) 肉豆蔻油与蜂胶在治疗化学物质诱发的白化大鼠舌乳头溃疡方面的可能效果。(组织学和扫描电子显微镜研究）

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.289606.3042

Aya Hamed Mekky, Eman Ahmed Mounir, Heba A.S. Elnashar, Medhat A. Elzeiny

引用次数: 0

Comparison of Strain Development of Implant Supported Three Units Fixed Partial Dentures Fabricated from Zirconia and PEEK “In-vitro study” 氧化锆和聚醚醚酮制作的种植体支持三单元固定局部义齿应变发展的比较 "体外研究

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.280626.2994

Mostafa Hassan, Tarek Salah, Gihan Younis, T. Samhan

{"title":"Comparison of Strain Development of Implant Supported Three Units Fixed Partial Dentures Fabricated from Zirconia and PEEK “In-vitro study”","authors":"Mostafa Hassan, Tarek Salah, Gihan Younis, T. Samhan","doi":"10.21608/edj.2024.280626.2994","DOIUrl":"https://doi.org/10.21608/edj.2024.280626.2994","url":null,"abstract":"Statement of the Problem: selection of prosthetic materials is a critical factor affecting the long-term success of implant supported restorations. PEEK poly-ether-ether ketone-is a quite new polymer used for dental applications. However, there are limited data available concerning Stress analysis and strain development of PEEK restorations as implant superstructure. Introduction; Materials and Methods: A total of 14 frameworks (n=7) were fabricated of Zirconia and PEEK by milling technique, divided into two equal groups to be randomly seated on its corresponding titanium abutment and then subjected to 5000 thermo-cycles. Strain gauge method was selected in this study to assess strain development where strain gauges were adhesively bonded mesial and distal to each implant-abutment unit and data were recorded using a strain meter device. Results: As regards the overall strain (mean of the four channels): there was no statistically significant difference between the two groups. Conclusion: PEEK frameworks revealed slightly higher strain compared to zirconia with o significant difference in the over-all strain channels.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"138 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141713988","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

Assessment of Sealing Ability of Different Bioceramics in Repair of Furcation Perforation: An In Vitro Study 评估不同生物陶瓷在修复窝洞穿孔中的密封能力：体外研究

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.276541.2979

Radwa Alsherbiny Alnaghy, Tariq Yehia, M. Elfaramawy

{"title":"Assessment of Sealing Ability of Different Bioceramics in Repair of Furcation Perforation: An In Vitro Study","authors":"Radwa Alsherbiny Alnaghy, Tariq Yehia, M. Elfaramawy","doi":"10.21608/edj.2024.276541.2979","DOIUrl":"https://doi.org/10.21608/edj.2024.276541.2979","url":null,"abstract":"Introduction: The objective of this study was to evaluate and compare the sealing ability of MTA, Nano-MTA and Biodentine in the repair of furcation perforation by using bacterial leakage test. Methods and Materials: Standard access cavities and furcal perforations were made in fifty extracted mandibular permanent molars. The teeth were randomly divided into five groups. Group 1: perforations were repaired with MTA, Group 2: perforations were repaired with Nano-MTA and Group 3: perforations were repaired with Biodentine. Ten teeth with unrepaired perforations were used as positive controls and ten teeth without perforations were used as negative controls. The sealing ability was evaluated using Enterococcus faecalis Bacterial leakage test. The samples were observed for 45 days for turbidity using spectrophotometer. Results: High statistically significant difference in leakage was found between the three materials when used as furcation perforation repair materials. Nano-MTA presented the best sealing ability with the least bacterial leakage followed by MTA, while Biodentine showed maximum bacterial leakage. Conclusion: Nano-MTA has better sealing ability than MTA and Biodentine and can be used in repair of furcation perforation.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"98 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141708751","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

Comparison of the Cyclic fatigue & the Cutting Efficiency of two Rotary NiTi Systems 两种旋转镍钛系统的循环疲劳和切割效率比较

Egyptian dental journal Pub Date : 2024-07-01 DOI: 10.21608/edj.2024.266146.2921

Mostafa Kandil, Ehab Hassanien, S. Fahmy

{"title":"Comparison of the Cyclic fatigue & the Cutting Efficiency of two Rotary NiTi Systems","authors":"Mostafa Kandil, Ehab Hassanien, S. Fahmy","doi":"10.21608/edj.2024.266146.2921","DOIUrl":"https://doi.org/10.21608/edj.2024.266146.2921","url":null,"abstract":"Purpose: This study compares cyclic fatigue and cutting efficiency of two types of NiTi Rotary files, namely AF one files with a constant 4% taper and Hyflex EDM Files with a variable taper. Materials and Methods: Forty files, twenty of each brand, were examined under a microscope to ensure their integrity before testing. The evaluation focused on cyclic fatigue and cutting efficiency. Cyclic fatigue testing utilized a specialized block simulating dental canals, following Grande et al.’s prescribed design. Lubricating oil flooded the artificial canals, and files were tested at specified RPM and torque until breakage, with recorded breakage times. Cutting efficiency testing involved using plexiglass blocks, and measuring the length of cut during 1 minute. A dedicated device facilitated testing, including an air compressor for debris clearance. Results: Data from both tests were collected and analyzed, revealing that Hyflex EDM files demonstrated superior resistance to cyclic fatigue compared to AF one files(p<0.001). However, AF one files exhibited higher cutting efficiency than Hyflex EDM (p= 0.001), with statistically significant differences in both results. These findings are crucial for dentists in making informed decisions about the choice of files for root canal treatment in their practice.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"71 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141692994","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

Awareness and knowledge of CBCT among a group of Egyptian Pediatric dentists: A questionnaire study 一组埃及儿科牙医对 CBCT 的认识和了解：问卷调查研究

Egyptian dental journal Pub Date : 2024-04-01 DOI: 10.21608/edj.2023.251293.2800

Sarah khalil, Shimaa Abu El Sadat, Reham Elghazawy

{"title":"Awareness and knowledge of CBCT among a group of Egyptian Pediatric dentists: A questionnaire study","authors":"Sarah khalil, Shimaa Abu El Sadat, Reham Elghazawy","doi":"10.21608/edj.2023.251293.2800","DOIUrl":"https://doi.org/10.21608/edj.2023.251293.2800","url":null,"abstract":"Aim: To assess the knowledge and awareness of CBCT among a group of Egyptian pediatric dentists Materials and methods: An online open-ended questionnaire with 21 items were delivered to around 300 applicants, who practice pediatric dentistry in Egypt. The questionnaire was conveyed by Facebook and distributed among different groups, via Whats app groups and messages, through emails and LinkedIn platform. Demographic, knowledge and awareness data regarding CBCT were collected. Categorical data were analyzed using chi square test followed by pairwise comparisons utilizing multiple z-tests with Bonferroni correction. The signi�cance level was set at p ≤ 0.05. Results: Two-hundred twenty-nine participants responded to the survey during a 2-month interval. Almost half of the respondents showed poor knowledge of CBCT, 65.2% believes that adequate teaching is not given to dental students, regarding CBCT in their universities, and 95.2% assumes that continuous education courses is required for pediatric dentists. Conclusions: There is explicit gap in knowledge and awareness of CBCT in pediatric dental practitioners, necessitating additional CBCT education and training courses for both undergraduate and postgraduate students. Clinical relevance: The increase of knowledge and awareness among Egyptian pediatric dentists is required, more training and tuition should be integrated in the students’ curricula in their undergraduate and post graduate stages.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140355132","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

Assessment of the Effectiveness of Revascularization Methods Utilizing Platelet-Rich Fibrin (PRF) Concentrate Versus Clot formation as a Supportive Matrix 利用富血小板纤维蛋白 (PRF) 浓缩物与血凝块形成作为支持性基质的血管重建方法的效果评估

Egyptian dental journal Pub Date : 2024-04-01 DOI: 10.21608/edj.2024.264047.2889

Ahmed Soliman

{"title":"Assessment of the Effectiveness of Revascularization Methods Utilizing Platelet-Rich Fibrin (PRF) Concentrate Versus Clot formation as a Supportive Matrix","authors":"Ahmed Soliman","doi":"10.21608/edj.2024.264047.2889","DOIUrl":"https://doi.org/10.21608/edj.2024.264047.2889","url":null,"abstract":"Introduction: Revascularization therapy for young permanent teeth with apical pathology has gained widespread acceptance as an alternative to traditional apexification procedures. In the context of regenerative endodontic treatment (RET), both PRF and clot formation [1] have been used as scaffolds. Objective : This study aimed to evaluate the microscopic tissue-level outcomes of the revascularization process in young permanent premolar dog teeth in vitro. This experimental study aimed to evaluate histological outcomes of the process in immature dog teeth. Methods : Sixty roots that were not fully developed were divided into three experimental groups (control and study) and each group divided again into subgroups (positive and negative) based on the treatment protocol. Moreover, samples from the normal pulp of dog teeth were incorporated. Results : The study group showed a statistically significant increase the percentage of blood vessels and odontoblasts numbers in comparison to the other two groups (P value < 0.001, P=0.003). In terms of inflammatory count, the negative control group showed a higher count in comparison the other two groups Conclusions : Clot formation and Platelet-Rich Plasma (PRP) demonstrated comparable outcomes in periapical healing, specifically regarding mean area fraction of blood vessels and odontoblasts numbers.","PeriodicalId":11504,"journal":{"name":"Egyptian dental journal","volume":"1379 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140773999","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