Dental Hypotheses最新文献_第6页

Evaluation of the Effect of Natural and Industrial Orange Juices and Beverage on Surface Roughness of Orthodontic Bonding Composite: An In Vitro Study 天然和工业桔子汁及饮料对正畸粘接复合材料表面粗糙度影响的体外评价

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Dental Hypotheses Pub Date : 2022-07-01 DOI: 10.4103/denthyp.denthyp_76_22

Rusal M Ahmed, Alan I Saleem

引用次数: 1

Evaluation of Apical Microleakage in Endodontically Treated Teeth Using Three Sealer Materials: An In Vitro Study 三种封闭剂材料评价牙髓治疗牙齿根尖微渗漏的体外研究

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Dental Hypotheses Pub Date : 2022-07-01 DOI: 10.4103/denthyp.denthyp_61_22

Biland M. S. Shukri, H. Jasim, M. Gholam

{"title":"Evaluation of Apical Microleakage in Endodontically Treated Teeth Using Three Sealer Materials: An In Vitro Study","authors":"Biland M. S. Shukri, H. Jasim, M. Gholam","doi":"10.4103/denthyp.denthyp_61_22","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_61_22","url":null,"abstract":"Introduction: GuttaFlow Bioseal (Roeko–Coltene/Whaledent, Langenau, Germany), TotalFill Bioceramic (FKG Dentaire SA, La Chaux-de-Fonds, Switzerland), and AH Plus root canal sealers (Dentsply, DeTrey, Germany) are used to prevent communication between periapical space and the root canal. This study aims to evaluate the apical microleakage of three endodontic sealers. Materials and Methods: Seventy-five freshly extracted mandibular premolars were prepared and obturated with single-cone gutta-percha, then grouped into three groups according to the sealers used. The data were analyzed using one-way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) test. Results: The least mean dye penetration was shown by GuttaFlow Bioseal sealer (1.31 mm), followed by TotalFill Bioceramic sealer (1.57 mm) and AH Plus sealer (2.63 mm); no dye penetration was found in the negative control group. One-way analysis of variance (ANOVA) showed statistically significant difference among all experimental groups (P < 0.001); Tukey test shows significant differences between all groups except for a nonsignificant difference between GuttaFlow Bioseal and TotalFill Bioceramic sealer (P = 0.6). Conclusion: All sealers showed varying levels of apical microleakage, with the least penetration in the GuttaFlow Bioseal group.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"103 - 106"},"PeriodicalIF":0.5,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44270098","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

How Many Microwave Disinfection Cycles is Safe for the Adaptability of Polymethyl Methacrylate (PMMA) Denture Base Materials?: An In Vitro Study 多少次微波消毒循环对聚甲基丙烯酸甲酯（PMMA）义齿基底材料的适应性是安全的？：体外研究

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Dental Hypotheses Pub Date : 2022-07-01 DOI: 10.4103/denthyp.denthyp_97_21

W. Ali, N. Ahmad, Sharifah Nor Ezura Syed Yussof

{"title":"How Many Microwave Disinfection Cycles is Safe for the Adaptability of Polymethyl Methacrylate (PMMA) Denture Base Materials?: An In Vitro Study","authors":"W. Ali, N. Ahmad, Sharifah Nor Ezura Syed Yussof","doi":"10.4103/denthyp.denthyp_97_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_97_21","url":null,"abstract":"Introduction: We aimed to determine the maximum microwave disinfection cycles that is safe for the adaptability of polymethyl methacrylate (PMMA) denture bases under power–time setting of 630 W for 3 minutes. Materials and Methods: Thirty PMMA maxillary denture bases were constructed and divided into two groups, control (no disinfection) and test (microwave disinfection at 630W for 3 minutes in water immersion). Coltene Rapid Liner (Coltene/Whaledent AG, Altstatten, Switzerland) silicone was coated onto the internal surface of the samples followed by placement of 8 kgf of axial load. The silicone film was removed, and weighed using analytical balance. One day interval was given between each cycle and samples were stored in 37°C water bath. Tests were carried out until a statistically significant silicone film weight change detected. The data were analyzed on SPSS version 21.0 (IBM Corp, Armonk, NY). Results: Statistically significant change of the denture base was detected after the tenth cycle of microwave irradiation. Conclusion: The maximum microwave disinfection cycles that is safe for the adaptability of PMMA denture bases under power–time setting of 630 W for 3 minutes is only up to 10 cycles.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"99 - 102"},"PeriodicalIF":0.5,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46184548","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

Assessment of the Shear Bond Strength of Composite Resin to Fresh Amalgam Using Different Adhesion Protocols: An In Vitro Study 使用不同粘附方案评估复合树脂与新鲜汞合金的剪切结合强度：体外研究

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Dental Hypotheses Pub Date : 2022-07-01 DOI: 10.4103/denthyp.denthyp_66_22

H. Jasim, M. Gholam, Biland M. S. Shukri

{"title":"Assessment of the Shear Bond Strength of Composite Resin to Fresh Amalgam Using Different Adhesion Protocols: An In Vitro Study","authors":"H. Jasim, M. Gholam, Biland M. S. Shukri","doi":"10.4103/denthyp.denthyp_66_22","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_66_22","url":null,"abstract":"Introduction: This study was conducted to evaluate and compare the effect of using three adhesive systems on the shear bond strength between composite resin and fresh amalgam. Materials and Methods: Amalgam samples were assigned into three groups according to the adhesive systems being used prior to the composite resin application. Group A (n = 10): universal self-etch bonding system (Single Bond Universal Adhesive, 3M, Neuss, Germany) was applied and light cured. Group B (n = 10): universal self-etch bonding was applied and light cured, followed by a thin layer of nanohybrid flowable composite (Tetric N-Flow, Ivoclar Vivadent, Liechtenstein), then light cured. Group C (n = 10): self-adhesive dual-cure luting resin cement (Calibra Universal, Dentsply Sirona, Charlotte, NC) was applied in equal quantity for each sample over amalgam surface. Composite resin was then applied by plastic instrument in a single increment to the height of the hole (2 mm), then celluloid strip was placed and light cured. After thermocycling, a shear bond test was performed. Results: Resin luting cement interface showed the higher significant bond strength, followed by universal bonding agent − flowable composite interface. The universal bonding interface group yielded the lowest results. Conclusion: The application of self-adhesive dual-cure luting resin cement resulted in significant increase in bond strength between composite resin and fresh amalgam.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"94 - 98"},"PeriodicalIF":0.5,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47987893","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

Efficacy of Socket-Shield Technique on Tissue Stability of Immediate Implant Placement: A Systematic Review with Meta-Analysis and Trial Sequential Analysis 嵌套-屏蔽技术对即刻种植体组织稳定性的影响:荟萃分析和试验序列分析的系统回顾

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Dental Hypotheses Pub Date : 2022-07-01 DOI: 10.4103/denthyp.denthyp_167_21

R. Birang, J. Yaghini, S. Farhad, M. Shadmehri, Zohreh Afshari, P. Iranmanesh, M. Maracy, Amir Zadeh

{"title":"Efficacy of Socket-Shield Technique on Tissue Stability of Immediate Implant Placement: A Systematic Review with Meta-Analysis and Trial Sequential Analysis","authors":"R. Birang, J. Yaghini, S. Farhad, M. Shadmehri, Zohreh Afshari, P. Iranmanesh, M. Maracy, Amir Zadeh","doi":"10.4103/denthyp.denthyp_167_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_167_21","url":null,"abstract":"Objective: To compare the socket-shield technique (SST) with the conventional method of immediate implant placement (IIP) regarding stabilization of buccal hard and soft tissue, and esthetic management. Method and Materials: Randomized controlled trials (RCT) investigating SST, published in English, were searched in MEDLINE/PubMed, Web of Science, Scopus, Cochrane, ProQuest, OpenGrey, and Embase until May May 2021, in June 2021. The quality assessment of included RCTs was conducted using the Cochrane Collaboration’s tools. A STATA version 16 was used to determine mean difference with 95% confidence intervals for buccal plate width (BPW), buccal plate height (BPH), pink esthetic score (PES), and implant stability quotient for 3, 6, and 12 months follow-up subgroups. Results: Out of 4617 records, 10 RCTs were finally included for the review and meta-analysis. Regarding BPW, significant differences were observed in favor of SST after 6 months. Also significant difference was detected in BPH and PES in favor of SST compared to the conventional method for all time points. However, no significant difference was found regarding implant stability between the two groups. Conclusion: SST yields better outcomes in dimensional changes of bone and soft tissue, and is found to be superior to conventional IIP regarding esthetic results and stability of hard and soft tissue around implants.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"75 - 81"},"PeriodicalIF":0.5,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46984664","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

Spectrophotometric Evaluation of the Color Change of Artificial White Spot Lesions Treated with Three Different Commercially Available Remineralizing Agents: An In Vitro Study 三种市售再矿化剂治疗人工白斑病变后颜色变化的分光光度评价:一项体外研究

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Dental Hypotheses Pub Date : 2022-07-01 DOI: 10.4103/denthyp.denthyp_129_21

Mohammadreza Malekipoor, F. Shirani, S. Mousavinasab, Niloufar Jafari, Negar Sharifinejad

引用次数: 0

Remineralization of Dentine Caries Using Moringa Oleifera Based Nano-Silver Fluoride: A Single-Blinded, Randomized, Active-Controlled Clinical Trial 基于辣木的纳米氟化银治疗牙本质龋的再矿化:一项单盲、随机、主动对照的临床试验

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Dental Hypotheses Pub Date : 2022-07-01 DOI: 10.4103/denthyp.denthyp_57_22

Duaa J Kadhem, A. A. Al Haidar

引用次数: 2

Lack of Fluid Movement between Dentin Tubule and Pulp Tissue: An In Vitro Study 牙本质小管与牙髓组织之间缺乏液体运动的体外研究

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Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_128_21

Chia-Yi Chen, G. Hasselgren

{"title":"Lack of Fluid Movement between Dentin Tubule and Pulp Tissue: An In Vitro Study","authors":"Chia-Yi Chen, G. Hasselgren","doi":"10.4103/denthyp.denthyp_128_21","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_128_21","url":null,"abstract":"Objective: In vitro studies supporting the hydrodynamic theory have reported that cavity provocation results in fluid flow from dentin tubules via pulp tissue to a capillary connected apically. Our preliminary findings did not corroborate this. Therefore, the aim was to perform experiments closely following the descriptions in the mentioned articles to find out if there is a direct fluid flow communication from a prepared cavity to pulp tissue detectable with this method. Material and Methods: Class V cavities were prepared and provocations (air blast, scraping, temperature change) initiated within 1 hour of extraction in 17 teeth and after 1 week in 3 teeth. Fluid flow was monitored during and after stimulation using a microscope. Results: No fluid flow was registered during stimulations performed within an hour of extraction. One week after extraction fluid movement was registered during the air blast. Conclusions: The finding of no direct continuum in freshly extracted teeth from cavity surface via dentin fluid to pulp tissue to an apically placed capillary does not per se disprove the hydrodynamic theory. As the in vitro experiment by Brännström et al. has been a major foundation for the hydrodynamic theory, it may be time to investigate the true mechanism(s) of dentin sensitivity.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"67 - 69"},"PeriodicalIF":0.5,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41467098","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 Friction and Surface Characteristics of Two Types of Self-Ligating Bracket Gate: An In Vitro Study 两种自结扎支架门的摩擦和表面特性的体外研究

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Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_34_22

A. Ibrahim, H. Kanbar, D. Obaid

{"title":"Evaluation of Friction and Surface Characteristics of Two Types of Self-Ligating Bracket Gate: An In Vitro Study","authors":"A. Ibrahim, H. Kanbar, D. Obaid","doi":"10.4103/denthyp.denthyp_34_22","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_34_22","url":null,"abstract":"Introduction: Frictional forces generation during orthodontic treatment with fixed appliances impedes appropriate tooth movement; hence, research is ongoing to explore “frictionless” techniques. This in vitro study compares Damon Q and Pactive self-ligating metallic brackets in terms of friction and surface characteristics of the bracket gates when using CuNiTi archwires during leveling and alignment stage and examines the effects of aging conditions on frictional force generation. Methods: A total of 108 metallic self-ligating brackets (Damon Q and Pactive) were investigated for frictional resistance with round 0.014″ and rectangular 0.014″∗0.025″ CuNiTi archwires post exposure to water storage and acidic attack aging conditions. The bracket gate surface characteristics were evaluated using scanning electron microscope (SEM). Results: There was no statistically significant difference (P > 0.05) in friction generation between the two bracket systems when coupled with 0.014″ CuNiTi archwire, but the Pactive brackets yielded significantly higher frictional forces (P < 0.05) when coupled with 0.014″∗0.025″ archwire. The SEM findings revealed nonsignificant differences (P > 0.05) between the surface characteristics of the bracket gates. Conclusions: Damon Q brackets generate low frictional forces, suggesting better performance than Pactive brackets during the first phase of orthodontic treatment. A modified scoring system was developed for an objective description of bracket surface characteristics.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"27 - 35"},"PeriodicalIF":0.5,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44588149","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

Microleakage Evaluation of Glass Hybrid Restoration Following Usage of Papain-Based Gel and Ceramic Bur for Caries Removal: An In Vitro Study 木瓜基凝胶与陶瓷复合牙体除龋后玻璃复合牙体的微渗漏评价

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Dental Hypotheses Pub Date : 2022-04-01 DOI: 10.4103/denthyp.denthyp_48_22

Halah Abdulkareem Alkhawaja, A. A. Al Haidar

{"title":"Microleakage Evaluation of Glass Hybrid Restoration Following Usage of Papain-Based Gel and Ceramic Bur for Caries Removal: An In Vitro Study","authors":"Halah Abdulkareem Alkhawaja, A. A. Al Haidar","doi":"10.4103/denthyp.denthyp_48_22","DOIUrl":"https://doi.org/10.4103/denthyp.denthyp_48_22","url":null,"abstract":"Introduction: In the field of pediatric dentistry, an urge to adopt a more comfortable, minimally invasive, and stressless technique for caries removal became a must. Coronavirus disease-2019 outbreak necessitates a paradigm change in the global health care protocols, requiring alternative, nonaerosol generating approaches. This study aimed to measure and compare the influence of two methods of caries removal, namely, Brix3000 and CeraBur, on the microleakage of glass hybrid restorative material. Materials and Methods: Thirty human primary molar teeth with accessible occluso-gingival carious cavitation were randomly allocated into CeraBur and Brix3000 groups. After selective caries excavation, samples were restored with Equia Forte HT, thermocycled, dipped in thiazine dye, washed, and sectioned through the restoration center. Then microleakage was measured using a stereomicroscope (30× magnification) at both occlusal and gingival margins. Results: No statistically significant difference was found between the two methods of caries removal (CeraBur and Brix3000) at both occlusal (P = 1.000) and gingival margins (P = 0.612). Conclusions: Brix3000 caries removing gel did not negatively affect the microleakage of Equia Forte HT compared to the CeraBur and hence can be used alternatively to the conventional drilling methods.","PeriodicalId":43354,"journal":{"name":"Dental Hypotheses","volume":"13 1","pages":"57 - 60"},"PeriodicalIF":0.5,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43049651","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