European Journal of Oral Sciences最新文献

Evaluation of compressive and adhesive strengths of a hybrid ceramic and 5Y-PSZ zirconia cemented with three different materials. 三种不同材料复合陶瓷与5Y-PSZ氧化锆的抗压和粘接强度评价。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-05-27 DOI: 10.1111/eos.70017

Letícia Moreschi, João Paulo De Carli, Marciele Cristiane Spanemberg Fuhr, Renan Brandenburg Dos Santos, Paulo Renato Pulga da Silva, Pedro Henrique Corazza

{"title":"Evaluation of compressive and adhesive strengths of a hybrid ceramic and 5Y-PSZ zirconia cemented with three different materials.","authors":"Letícia Moreschi, João Paulo De Carli, Marciele Cristiane Spanemberg Fuhr, Renan Brandenburg Dos Santos, Paulo Renato Pulga da Silva, Pedro Henrique Corazza","doi":"10.1111/eos.70017","DOIUrl":"https://doi.org/10.1111/eos.70017","url":null,"abstract":"This study aimed to evaluate the compressive and adhesive strengths of ceramic restorations (PICN and 5Y-PSZ zirconia) cemented with one of three types of cements: conventional glass ionomer cement (GI), resin-modified glass ionomer cement (RM-GI), and self-adhesive resin cement (R). Ceramic specimens (5Y-PSZ, n = 72; PICN, n = 60) were prepared for testing after cementation onto glass fiber-reinforced resin-based composite tooth analogs. The 5Y-PSZ specimens underwent tribochemical silica coating before cementation. Specimens intended for compressive strength evaluation were mechanically cycled (500,000 cycles) before testing. A microtensile bond strength test was used to evaluate adhesive strength, with specimens sectioned into microbars (1 mm2 cross-section) and loaded until fracture. If pre-test failures occurred, bond strength was assessed using microshear tests. PICN restorations showed significantly higher compressive strength than 5Y-PSZ. For PICN, self-adhesive resin cement yielded the highest compressive strength. For adhesive strength, PICN restorations cemented with self-adhesive or RM-GI cements outperformed GI. The 5Y-PSZ+R combination showed the highest microshear bond strength, superior to 5Y-PSZ+RM-GI and 5Y-PSZ+GI. Resin cements showed higher compressive and adhesive strengths for PICN than glass ionomer-based cements. For 5Y-PSZ, the cement type did not significantly affect compressive strength. Overall, PICN restorations outperformed 5Y-PSZ in compressive and adhesive strengths.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":" ","pages":"e70017"},"PeriodicalIF":1.8,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144149877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of human survivin-2B-specific cytotoxic CD8+ T lymphocytes on CD44+/- HSC-2 and HSC-3 oral cancer cells. 人survivin- 2b特异性细胞毒性CD8+ T淋巴细胞对CD44+/- HSC-2和HSC-3口腔癌细胞的影响

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-05-21 DOI: 10.1111/eos.70019

Sho Miyamoto, Azuna Osaki, Aiko Murai, Yoshihiko Hirohashi, Takanori Sasaki, Kazuhiro Ogi, Taka-Aki Tokura, Takayuki Kanaseki, Tomohide Tsukahara, Shinichiro Kina, Toshihiko Torigoe, Akihiro Miyazaki

{"title":"Effect of human survivin-2B-specific cytotoxic CD8+ T lymphocytes on CD44+/- HSC-2 and HSC-3 oral cancer cells.","authors":"Sho Miyamoto, Azuna Osaki, Aiko Murai, Yoshihiko Hirohashi, Takanori Sasaki, Kazuhiro Ogi, Taka-Aki Tokura, Takayuki Kanaseki, Tomohide Tsukahara, Shinichiro Kina, Toshihiko Torigoe, Akihiro Miyazaki","doi":"10.1111/eos.70019","DOIUrl":"https://doi.org/10.1111/eos.70019","url":null,"abstract":"Despite advancements in the treatment of oral cancer, cancer survival rates remain low, highlighting the need for new therapeutic strategies targeting cancer stem-like cells. Cancer stem-like cells are a small population of cancer cells within tumors that drive recurrence and metastasis. They are often resistant to conventional treatments. Immunotherapy has shown promise against cancer stem-like cells, particularly with the use of cytotoxic T lymphocytes targeting specific markers. Survivin, an apoptosis protein inhibitor, is overexpressed in several malignancies, including oral cancer, and is associated with tumor recurrence and reduced survival. Survivin-2B-specific cytotoxic T lymphocytes were produced and evaluated for their ability to target CD44+ (cancer stem-like cells) and CD44- cells (non-cancer stem-like cells), respectively, from oral cancer cell lines (HSC-2 and HSC-3, respectively). Quantitative polymerase chain reaction (qPCR) analysis confirmed similar survivin-2B expression in both cell types. Cytotoxic T lymphocyte assays revealed the effective lysis of both cancer stem-like cells and CD44- cell populations, supporting the potential of survivin-2B-specific cytotoxic T lymphocytes to overcome cancer stem-like cell-associated resistance. These findings suggest that survivin-2B peptide vaccines are effective in preventing cancer relapse by targeting cancer stem-like cells, with future directions aimed at developing multipeptide \"cocktail\" vaccines to reduce the risk of immune evasion.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":" ","pages":"e70019"},"PeriodicalIF":1.8,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144119208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cervical proprioception and dysphagia severity in multiple sclerosis: A cross-sectional clinical analysis 多发性硬化症颈椎本体感觉和吞咽困难严重程度：一项横断面临床分析。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-05-13 DOI: 10.1111/eos.70012

Hanife Abakay, M. Fatih Yetkin, Ayşe Güç, Gizem Şekercan

{"title":"Cervical proprioception and dysphagia severity in multiple sclerosis: A cross-sectional clinical analysis","authors":"Hanife Abakay, M. Fatih Yetkin, Ayşe Güç, Gizem Şekercan","doi":"10.1111/eos.70012","DOIUrl":"10.1111/eos.70012","url":null,"abstract":"This study aimed to investigate the relationship between dysphagia severity and neck proprioception, pain, and mood in individuals with multiple sclerosis (MS). The individuals were divided into two groups according to the severity of dysphagia: dysphagia group (n = 13) with a score of 3 and above on the Dysphagia Assessment Scale in Multiple Sclerosis (DYMUS) scale and mild dysphagia group (n = 13) with a score of 2 and below. Clinical swallowing function was evaluated with the Turkish version of the Eating Assessment Tool-10 (T-EAT-10) and DYMUS. Proprioception was assessed with a laser by noting the deviation from the center target in centimeters. Neck pain severity was assessed with the Visual Analogue Scale (VAS), and mood was assessed with the Beck Depression Inventory (BDI). Individuals with severe dysphagia demonstrated statistically significantly greater proprioceptive impairment in cervical extension and right rotation. A significant difference was also found between the two groups in terms of clinical swallowing evaluations, neck pain status, and mood measurements. The findings suggest that proprioceptive deficits, increased pain, and mood disturbances are closely associated with dysphagia severity in MS. A multidimensional approach addressing dysphagia, proprioception, and pain management may be beneficial in optimizing dysphagia rehabilitation in patients with MS.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":"133 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eos.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143969774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of surface conditioning protocols on the repair bond strength of resin composite to CAD/CAM blocks: Bioactive-glass, silica-coated alumina, or aluminum oxide? 表面调理方案对树脂复合材料与CAD/CAM块的修复结合强度的影响：生物活性玻璃、二氧化硅涂层氧化铝或氧化铝？

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-05-13 DOI: 10.1111/eos.70016

Büşra Karabulut Gençer, Ayşe Aslı Şenol, Ezgi Acar, Pınar Yılmaz Atalı, Bilge Tarçın, Mutlu Özcan

{"title":"Effect of surface conditioning protocols on the repair bond strength of resin composite to CAD/CAM blocks: Bioactive-glass, silica-coated alumina, or aluminum oxide?","authors":"Büşra Karabulut Gençer, Ayşe Aslı Şenol, Ezgi Acar, Pınar Yılmaz Atalı, Bilge Tarçın, Mutlu Özcan","doi":"10.1111/eos.70016","DOIUrl":"https://doi.org/10.1111/eos.70016","url":null,"abstract":"This study evaluated the repair bond strengths of ceramic and hybrid ceramic CAD/CAM restorations following bioactive-glass, silica-coated alumina, and aluminum oxide surface treatments. Shear bond strength (SBS) tests, surface roughness, and scanning electron microscopic (SEM) evaluations were performed on 180 specimens (7×12×2 mm3 and 5×5×3 mm3, respectively) of ceramic (IPS Empress) and hybrid ceramic (Cerasmart270) blocks. Samples were thermocycled (5°C-55°C, 5000 cycles) and silica-coated alumina, Al2O3, or bioactive-glass were used for surface conditioning. Resin composite was applied on substrate using two- (Tokuyama Universal) or one-bottle (G-Premio) universal adhesives, combined with the same brand universal shade composites (Omnichroma, Essentia Universal). SBS values were measured using a universal testing machine; failure types were analyzed using a stereomicroscope. Surface roughness was assessed with a profilometer, followed by SEM. Statistical analysis included ANOVA, Tukey HSD, and Fisher's Exact tests. The highest mean SBS values were observed for ceramics in conjunction with two-bottle universal adhesives. No statistically significant differences were found in the SBS values for different surface conditioning treatments except for hybrid ceramic conditioned with Al2O3. Bioactive-glass and silica-coated alumina caused similar surface roughness as indicated by the SEM images. A surface conditioning method and an adhesive system are both essential for hybrid ceramic repairs, while the adhesive system was more critical for ceramics.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":" ","pages":"e70016"},"PeriodicalIF":1.8,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143969775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The impact of genetic variations in retinoid X receptor alpha on the risk and prognosis of HPV-negative oral carcinoma 类视黄醇X受体α基因变异对hpv阴性口腔癌风险和预后的影响。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-05-12 DOI: 10.1111/eos.70015

Dragan Pandzic, Gordana Supic, Debora Misic, Aleksandra Petkovic Curcin, Sasa Jovic, Marko Brkic, Zoran Kozomara, Katarina Djurdjevic, Srboljub Stosic, Ruzica Kozomara

{"title":"The impact of genetic variations in retinoid X receptor alpha on the risk and prognosis of HPV-negative oral carcinoma","authors":"Dragan Pandzic, Gordana Supic, Debora Misic, Aleksandra Petkovic Curcin, Sasa Jovic, Marko Brkic, Zoran Kozomara, Katarina Djurdjevic, Srboljub Stosic, Ruzica Kozomara","doi":"10.1111/eos.70015","DOIUrl":"10.1111/eos.70015","url":null,"abstract":"Oral squamous cell carcinoma (OSCC) is characterized by a high recurrence rate and poor survival. The retinoid X receptor (RXR) is a nuclear receptor that modulates a variety of biological processes related to cancer, including apoptosis, cellular adhesion, and immune function. A number of cancers exhibit aberrant expression and altered function of the RXR isoform alpha (RXRA), but the polymorphisms in the RXRA gene have not been investigated previously in patients with oral cancer. The current study examined the RXRA rs7864987 and rs3118523 genetic variants, assessed by the real-time PCR Taq-Man method, in 95 HPV-negative OSCC patients and 101 age- and sex-matched healthy controls. Kaplan-Meier analysis revealed that RXRA rs7864987 was significantly associated with worse overall survival and showed a tendency toward lower recurrence-free survival when compared with the wild-type allele carriers (combined TC+TT genotypes) to the mutant genotype CC. RXRA rs7864987, however, did not independently predict overall survival. The C allele of the RXRA rs3118523 genetic variant was associated with a reduced risk of OSCC. Our study indicates that polymorphisms of the RXRA gene may be prognostic and disease-predisposing genetic factors for OSCC. Additionally, RXRA polymorphisms might influence a potential genetic profile-based approach for retinoid therapy in OSCC.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":"133 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144063166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An in vitro study on the bond strength between composite resin and porcelain using different surface treatment and bonding methods 不同表面处理方法对复合树脂与陶瓷结合强度的体外研究。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-05-05 DOI: 10.1111/eos.70014

Mina Aker Sagen, Bjørk Eriksen, Kaja Moland, Bjørn Einar Dahl

{"title":"An in vitro study on the bond strength between composite resin and porcelain using different surface treatment and bonding methods","authors":"Mina Aker Sagen, Bjørk Eriksen, Kaja Moland, Bjørn Einar Dahl","doi":"10.1111/eos.70014","DOIUrl":"10.1111/eos.70014","url":null,"abstract":"The study aimed to determine the effect of different surface treatments and bonding methods on bond strength between composite resin and feldspar ceramic, focusing on the interplay between these variables for enhanced clinical outcomes of chipping repair. Two surface treatments (hydrofluoric acid [HF] etching and surface roughening using a diamond disc) were investigated alongside two bonding methods utilizing either a universal adhesive (Scotchbond Universal, 3M) or a separate silane primer and adhesive (Intraoral Repair Kit, BISCO). Bond strength was measured using shear forces, and light microscopy was used to analyse the fracture mode. The findings indicate that the bonding method plays a more significant role than surface treatment for increasing bond strength since bond strength was similar following either roughening or HF acid etching. The separate silane primer and adhesive demonstrated superior bond strength over the universal adhesive, despite both containing silane, and this was attributed to differences in silane monomer stability. Selecting an appropriate bonding method, specifically using separate silane primer, enhances bond strength in composite repairs. This approach may mitigate the known risks associated with HF and addresses clinical challenges by optimizing the bond stability between feldspathic porcelain and composite resin.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":"133 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eos.70014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143985271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of mussel-inspired primers on resin–dentin bonding interface stability: A systematic review and meta-analysis 贻贝启发的引物对树脂-牙本质结合界面稳定性的影响：系统综述和荟萃分析。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-04-29 DOI: 10.1111/eos.70011

Samuel Chillavert Dias Pascoal, Maria Clara Ayres Estellita, Fábio Wildson Gurgel Costa, Juliano Sartori Mendonça

{"title":"Effect of mussel-inspired primers on resin–dentin bonding interface stability: A systematic review and meta-analysis","authors":"Samuel Chillavert Dias Pascoal, Maria Clara Ayres Estellita, Fábio Wildson Gurgel Costa, Juliano Sartori Mendonça","doi":"10.1111/eos.70011","DOIUrl":"10.1111/eos.70011","url":null,"abstract":"This paper presents the results of a systematic review and meta-analysis on the efficacy of mussel-inspired primers on resin-dentin bond stability. This review was registered on the OSF platform (https://doi.org/10.17605/OSF.IO/QC7VU) and followed PRISMA guidelines. Databases included PubMed, SCOPUS, Web of Science, EMBASE, Lilacs, LIVIVO, and gray literature. Eligibility criteria included in vitro studies using human dentin, which assessed bond strength through microtensile tests after applying mussel-inspired primers. Exclusion criteria were studies evaluating bond strength to enamel, animal dentin, and ceramics, those not using the microtensile test, or those conducting immediate evaluation only. The RoBDEMAT tool was used for risk-of-bias analysis. Two independent reviewers screened 5522 articles, and seven were selected. The studies showed a similar risk of bias performance, with insufficient reporting of different parameters, while not presenting significant publication bias. Meta-analysis revealed significantly higher bond strength in specimens treated with mussel-inspired monomers after thermocycling. Across studies, no substantial reduction in heterogeneity was observed using the leave-one-out method. Mussel-inspired monomers incorporated into the dentin adhesive procedure can enhance bond strength, mainly through their catecholic groups, highlighting their potential in adhesive dentistry. However, drawbacks such as oxidative potential and effects on the degree of conversion may limit their widespread application.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":"133 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eos.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143992453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of autoclave sterilization on nickel ion release from stainless steel crowns and space maintainer bands 高压灭菌器灭菌对不锈钢牙冠和空间保持带镍离子释放的影响。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-04-22 DOI: 10.1111/eos.70013

Noura Alessa, Habah Alhamdan, Shahad Alrobaish, Nisrin AlQahtani, Norah Alarifi, Manal Almutairi, Latifa Alhowaish, Majedah Al-Homaidhi, Reuof Alessa

{"title":"Effect of autoclave sterilization on nickel ion release from stainless steel crowns and space maintainer bands","authors":"Noura Alessa, Habah Alhamdan, Shahad Alrobaish, Nisrin AlQahtani, Norah Alarifi, Manal Almutairi, Latifa Alhowaish, Majedah Al-Homaidhi, Reuof Alessa","doi":"10.1111/eos.70013","DOIUrl":"10.1111/eos.70013","url":null,"abstract":"This study aimed to investigate the effect of autoclave sterilization on the leaching of nickel ions from stainless steel crowns and space maintainer bands used in pediatric dentistry. Sixty space maintainer bands and 60 stainless steel crowns were divided into sterilized (Amsco Century V-120 Prevac steam sterilizer) and non-sterilized groups. These samples were immersed in artificial saliva, placed in individual petri dishes, and then incubated at 37°C. The samples were analyzed for 42 days using a gas chromatography-mass spectrometry (GC-MS) machine to quantify the release of nickel ions. Nickel release was higher in the sterilized samples than in the non-sterilized samples for both space maintainer bands and stainless steel crowns. This trend persisted throughout most days of the experiment, with a peak release observed on day 7. Autoclave sterilization had a significant impact on ion release, raising potential concerns regarding the material's biocompatibility. Dentists should be mindful of the increased nickel release observed from sterilized crowns and bands, as this information could influence treatment decisions, especially in children who are predisposed to allergies.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":"133 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eos.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143978110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application and optimization of alkaline hydrolysis in recycling clear aligners 碱性水解在清净剂回收中的应用及优化。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-04-16 DOI: 10.1111/eos.70010

Chenkai Lan, Wubin Ouyang, Heqian Wang, Jingjing Yan, Shu Ouyang, Xiaoxuan Xu, Frank Keko, Jian Zhang, Dalei Sun

{"title":"Application and optimization of alkaline hydrolysis in recycling clear aligners","authors":"Chenkai Lan, Wubin Ouyang, Heqian Wang, Jingjing Yan, Shu Ouyang, Xiaoxuan Xu, Frank Keko, Jian Zhang, Dalei Sun","doi":"10.1111/eos.70010","DOIUrl":"10.1111/eos.70010","url":null,"abstract":"An increasing number of patients with malocclusion are choosing clear aligners for treatment, leading to a substantial rise in their production. Given the potential environmental impact of plastic products, recycling clear aligners is crucial. This study employed alkaline hydrolysis to recover the degradation products of clear aligners. The aligners were subjected to hydrolysis under various reaction conditions, including different concentrations of sodium hydroxide (NaOH), temperature, reaction time, ethanol-to-water mass ratio, and stirring rate. After the reaction, the organic components were isolated using thin-layer chromatography (TLC) plates, and their structure was characterized by 1H-NMR spectroscopy and mass spectrometry. The degradation product was identified as 4,4′-methylenedianiline (MDA). The optimal reaction conditions for achieving the maximum degradation yield of MDA were determined to be stirring at 300 rpm at 130°C in a solution containing 5 wt% NaOH and a 1:1 mass ratio of ethanol to water for 24 h. This method demonstrates that clear aligners can be effectively recycled through alkaline hydrolysis, supporting global efforts to reduce environmental emissions.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":"133 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143988022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","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 repeated porcelain firing cycles on the microstructure, marginal and internal fit of implant-cemented Co-Cr frameworks 重复烧成循环对种植-胶结Co-Cr框架微观结构、边缘和内部配合的影响。

IF 1.8 4区医学

European Journal of Oral Sciences Pub Date : 2025-03-17 DOI: 10.1111/eos.70009

Michael Nikolopoulos, Konstantinos Dimitriadis, Stavros Yannikakis, Aristidis Galiatsatos, Pepie Tsolka

{"title":"Influence of repeated porcelain firing cycles on the microstructure, marginal and internal fit of implant-cemented Co-Cr frameworks","authors":"Michael Nikolopoulos, Konstantinos Dimitriadis, Stavros Yannikakis, Aristidis Galiatsatos, Pepie Tsolka","doi":"10.1111/eos.70009","DOIUrl":"10.1111/eos.70009","url":null,"abstract":"This study investigated the effect of porcelain firing cycles and fabrication techniques on the microstructure, marginal, and internal fit of implant-cemented cobalt-chromium alloys (Co-Cr) frameworks. Two groups of Co-Cr specimens were prepared: one using selective laser melting (SLM) and the other through the lost wax-casting technique (C). Each group was further divided into two subgroups: as-manufactured and porcelain-fired specimens. The microstructure was analyzed using x-ray diffraction (XRD) and scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM/EDX). Ten Co-Cr frameworks per manufacturing technique were fabricated, with marginal and internal discrepancies measured using micro-CT before and after the firing cycles. The results were analyzed by two-way ANOVA and Tukey multiple-comparison tests. The results showed a mixed microstructure of γ-fcc and ε-hcp cobalt-based phases, with porcelain firings increasing ε-Co content, especially in group C. The C specimens exhibited distribution of small pores, while no pores/defects were found in the SLM group. The SLM group, although not at a statistically significant level, showed reduced marginal and internal discrepancy values after firings. In the same behavior pattern, the C group exhibited statistically significantly lower discrepancy values. Ultimately, all subgroups demonstrated clinically acceptable marginal adaptation, but the SLM frameworks exhibited superior marginal and internal fit which remained unaffected by the firing cycles.","PeriodicalId":11983,"journal":{"name":"European Journal of Oral Sciences","volume":"133 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eos.70009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143647757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0