Acta Biomaterialia Odontologica Scandinavica最新文献_第2页

Fracture load of colored and non-colored high translucent zirconia three-unit fixed dental prosthesis frameworks. 彩色和非彩色高半透明氧化锆三单元固定义齿框架的断裂载荷。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2018-04-04 eCollection Date: 2018-01-01 DOI: 10.1080/23337931.2018.1459626

Deyar Jallal Hadi Mahmood, Michael Braian, Abdul-Salam Khan, Armin Shabaz, Christel Larsson

{"title":"Fracture load of colored and non-colored high translucent zirconia three-unit fixed dental prosthesis frameworks.","authors":"Deyar Jallal Hadi Mahmood, Michael Braian, Abdul-Salam Khan, Armin Shabaz, Christel Larsson","doi":"10.1080/23337931.2018.1459626","DOIUrl":"https://doi.org/10.1080/23337931.2018.1459626","url":null,"abstract":"Aim: The use of colored translucent zirconia may enable restorations of a more natural tooth-like appearance than previous opaque white zirconia. The shift from non-colored to colored zirconia may however entail a risk of reduced strength. The aim of the present study was to compare fracture load and fracture mode of fixed dental prostheses frameworks made of colored translucent zirconia to that of non-colored controls. Methods: A total of forty three-unit FDP frameworks were manufactured from two different high translucent zirconia materials (Zenostar, Wieland Dental, and DD cubeX2, Dental Direkt). Each group contained two subgroups, one colored and one non-colored. Coloring was performed before final sintering using two different infiltration techniques. All FDPs underwent an artificial aging process in the form of heat treatment, thermocycling and preloading whereafter the specimens were subjected to load until fracture. Fracture load and mode was registered. Results: For one of the zirconia materials, Zenostar, the non-colored frameworks showed significantly higher fracture loads (p < .0001) compared to its colored counterpart. No significant difference (p > .05) was found between colored and non-colored frameworks in the other zirconia material, DD cubeX2. All FDPs fractured through the connector. Some fractures ran through the mesial and some through the distal side of the connector but there were no significant differences in fracture mode between groups. Conclusion: Coloring before sintering of high-translucent zirconia may decrease the fracture load of FDP frameworks for certain materials and techniques. Fracture mode however, does not appear to be affected.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"4 1","pages":"38-43"},"PeriodicalIF":0.0,"publicationDate":"2018-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2018.1459626","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36054505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Effect of low-shrinkage monomers on the physicochemical properties of experimental composite resin. 低收缩单体对实验性复合树脂理化性能的影响。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2018-02-28 eCollection Date: 2018-01-01 DOI: 10.1080/23337931.2018.1444488

Jingwei He, Sufyan Garoushi, Pekka K Vallittu, Lippo Lassila

{"title":"Effect of low-shrinkage monomers on the physicochemical properties of experimental composite resin.","authors":"Jingwei He, Sufyan Garoushi, Pekka K Vallittu, Lippo Lassila","doi":"10.1080/23337931.2018.1444488","DOIUrl":"https://doi.org/10.1080/23337931.2018.1444488","url":null,"abstract":"This study was conducted to determine whether novel experimental low-shrinkage dimethacrylate co-monomers could provide low polymerization shrinkage composites without sacrifice to degree of conversion, and mechanical properties of the composites. Experimental composites were prepared by mixing 28.6 wt% of bisphenol-A-glycidyl dimethacrylate based resin matrix (bis-GMA) with various weight-fractions of co-monomers; tricyclo decanedimethanol dacrylate (SR833s) and isobornyl acrylate (IBOA) to 71.4 wt% of particulate-fillers. A composite based on bis-GMA/TEGDMA (triethylene glycol dimethacrylate) was used as a control. Fracture toughness and flexural strength were determined for each experimental material following international standards. Degree of monomer-conversion (DC%) was determined by FTIR spectrometry. The volumetric shrinkage in percent was calculated as a buoyancy change in distilled water by means of the Archimedes' principle. Polymerization shrinkage-strain and -stress of the specimens were measured using the strain-gage technique and tensilometer, respectively with respect to time. Statistical analysis revealed that control group had the highest double-bond conversion (p < .05) among the experimental resins tested. All of the experimental composite resins had comparable flexural strength, modulus, and fracture toughness (p > .05). Volumetric shrinkage and shrinkage stress decreased with increasing IBOA concentration. Replacing TEGDMA with SR833s and IBOA can decrease the volumetric shrinkage, shrinkage strain, and shrinkage stress of composite resins without affecting the mechanical properties. However, the degree of conversion was also decreased.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"4 1","pages":"30-37"},"PeriodicalIF":0.0,"publicationDate":"2018-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2018.1444488","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35910909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

In vitro analysis of the marginal adaptation and discrepancy of stainless steel crowns. 不锈钢冠的体外边缘适应与差异分析。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2018-02-28 eCollection Date: 2018-01-01 DOI: 10.1080/23337931.2018.1444995

Riaan Mulder, Rasha Medhat, Nadia Mohamed

{"title":"In vitro analysis of the marginal adaptation and discrepancy of stainless steel crowns.","authors":"Riaan Mulder, Rasha Medhat, Nadia Mohamed","doi":"10.1080/23337931.2018.1444995","DOIUrl":"10.1080/23337931.2018.1444995","url":null,"abstract":"Aim: The purpose of the study was to assess the marginal adaptation and discrepancy of SSC's. Differences in adaptation and discrepancy between the four surfaces (mesial, lingual, distal, and buccal) were evaluated. Methods: The placement of stainless steel crowns were completed on a phantom head in accordance with the clinical technique. The ideal tooth preparation was made and this 'master tooth' duplicated to achieve a sample size of 15. The stainless steel crowns were placed, trimmed, and cemented as per the clinical technique. The cemented stainless crowns were analyzed under 100× stereomicroscope magnification. The marginal adaptation and discrepancy of each specimen was measured every 2 µm. Results: All the specimens showed marginal adaptation and discrepancy. The lingual margin had a significantly better adaptation (p < .0001) over the other surfaces. The buccal surface was the only surface that had an appropriate supra-CEJ level with a significance of p < .0001. Conclusion: The marginal discrepancies occur during the trimming procedure and assessment of the gingival approximation of the SSC margin. The inspection of stainless steel crown adaptation and discrepancy is an essential clinical step.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"4 1","pages":"20-29"},"PeriodicalIF":0.0,"publicationDate":"2018-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2018.1444995","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35910907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Repair bond strength of nanohybrid composite resins with a universal adhesive. 纳米复合树脂与通用胶粘剂的修复粘合强度。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2017-12-12 eCollection Date: 2018-01-01 DOI: 10.1080/23337931.2017.1412262

Pinar Altinci, Murat Mutluay, Arzu Tezvergil-Mutluay

{"title":"Repair bond strength of nanohybrid composite resins with a universal adhesive.","authors":"Pinar Altinci, Murat Mutluay, Arzu Tezvergil-Mutluay","doi":"10.1080/23337931.2017.1412262","DOIUrl":"https://doi.org/10.1080/23337931.2017.1412262","url":null,"abstract":"Objective: To investigate the repair bond strength of fresh and aged nanohybrid and hybrid composite resins using a universal adhesive (UA). Materials and methods: Fresh and aged substrates were prepared using two nanohybrid (Venus Pearl, Heraus Kulzer; Filtek Supreme XTE, 3 M ESPE) and one hybrid (Z100, 3 M ESPE) composite resin, and randomly assigned to different surface treatments: (1) no treatment (control), (2) surface roughening with 320-grit (SR), (3) SR + UA (iBOND, Heraus Kulzer), (4) SR + Silane (Signum, Ceramic Bond I, Heraeus Kulzer) + UA, (5) SR + Sandblasting (CoJet, 3 M ESPE) + Silane + UA. After surface treatment, fresh composite resin was added to the substrates at 2 mm layer increments to a height of 5 mm, and light cured. Restored specimens were water-stored for 24 h and sectioned to obtain 1.0 × 1.0 mm beams (n = 12), and were either water-stored for 24 h at 37 °C, or water-stored for 24 h, and then thermocycled for 6000 cycles before microtensile bond strength (µTBS) testing. Data were analyzed with ANOVA and Tukey's HSD tests (p = .05). Results: Combined treatment of SR, sandblasting, silane and UA provided repair bond strength values comparable to the cohesive strength of each tested resin material (p < .05). Thermocycling significantly reduced the cohesive strength of the composite resins upto 65% (p < .05). Repair bond strengths of UA-treated groups were more stable under thermocycling. Conclusions: Universal adhesive application is a reliable method for composite repair. Sandblasting and silane application slightly increases the repair strength for all substrate types.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"4 1","pages":"10-19"},"PeriodicalIF":0.0,"publicationDate":"2017-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2017.1412262","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35664458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 51

Triethylene glycol dimethacrylate: adjuvant properties and effect on cytokine production. 三甘醇二甲基丙烯酸酯:佐剂性质及对细胞因子产生的影响。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2017-12-05 eCollection Date: 2018-01-01 DOI: 10.1080/23337931.2017.1409075

Sara Alizadehgharib, Anna-Karin Östberg, Ulf Dahlgren

{"title":"Triethylene glycol dimethacrylate: adjuvant properties and effect on cytokine production.","authors":"Sara Alizadehgharib, Anna-Karin Östberg, Ulf Dahlgren","doi":"10.1080/23337931.2017.1409075","DOIUrl":"https://doi.org/10.1080/23337931.2017.1409075","url":null,"abstract":"Objective: Leakage of monomers from dental fillings due to incomplete curing is very common. The objective of the present study was to examine the cytokine profile in cells exposed to triethyleneglycol dimethacrylate (TEGDMA) and the adjuvant properties of TEGDMA. Materials and methods: Human peripheral blood mononuclear cells were exposed to TEGDMA (500 and 1000 μM) for 24 h in vitro. Bio-Plex Pro™ assays were used for analysis and detection of cytokines. In vivo, BALB/c mice were immunized subcutaneously in the base of the tail with TEGDMA in combination with ovalbumin (OVA). Results: The cytokine levels of IL-8, IL-18, GRO-α and MCP-1 were significantly increased for both concentrations. IL-1β, IL-6 and TNF-α was only significantly increased in cultures exposed to 500 μM TEGDMA. The concentration of TNF-α was significantly decreased in cultures exposed to 1000 μM TEGDMA. Animals immunized with OVA co-administrated with TEGDMA had a significantly higher IgE and IgG anti-OVA antibody levels in blood than animals immunized with OVA only. Conclusions: TEGDMA affects production of proinflammatory cytokines IL-1β, IL-6, IL-8, IL-18 and TNF-α. This inflammatogenic capacity renders TEGDMAs adjuvant properties, which may interfere with the homeostasis between the immune system and the indigenous microflora in the oral cavity.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"4 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2017-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2017.1409075","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35244937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Release of titanium after insertion of dental implants with different surface characteristics - an ex vivo animal study. 植入不同表面特征的牙种植体后钛的释放-一项离体动物研究。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2017-11-14 eCollection Date: 2017-01-01 DOI: 10.1080/23337931.2017.1399270

Mattias Pettersson, Jean Pettersson, Margareta Molin Thorén, Anders Johansson

引用次数: 26

Fracture strength of veneered translucent zirconium dioxide crowns with different porcelain thicknesses. 不同瓷厚贴面半透明二氧化锆冠的断裂强度。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2017-11-14 eCollection Date: 2017-01-01 DOI: 10.1080/23337931.2017.1403288

Fahad Bakitian, Przemek Seweryniak, Evaggelia Papia, Christel Larsson, Per Vult von Steyern

{"title":"Fracture strength of veneered translucent zirconium dioxide crowns with different porcelain thicknesses.","authors":"Fahad Bakitian, Przemek Seweryniak, Evaggelia Papia, Christel Larsson, Per Vult von Steyern","doi":"10.1080/23337931.2017.1403288","DOIUrl":"https://doi.org/10.1080/23337931.2017.1403288","url":null,"abstract":"Objective: To evaluate fracture strength of veneered translucent zirconium dioxide crowns designed with different porcelain layer thicknesses. Materials and Methods: Sixty crowns, divided into six groups of 10, were used in this study. Groups were divided according to different thicknesses of porcelain veneer on translucent zirconium dioxide cores of equal thickness (0.5 mm). Porcelain thicknesses were 2.5, 2.0, 1.0, 0.8, 0.5 and 0.3 mm. Crowns were artificially aged before loaded to fracture. Determination of fracture mode was performed using light microscope. Results: Group 1.0 mm showed significantly (p ≤ .05) highest fracture loads (mean 1540 N) in comparison with groups 2.5, 2.0 and 0.3 mm (mean 851, 910 and 1202 N). There was no significant difference (p>.05) in fracture loads among groups 1.0, 0.8 and 0.5 mm (mean 1540, 1313 and 1286 N). There were significantly (p ≤ .05) more complete fractures in group 0.3 mm compared to all other groups which presented mainly cohesive fractures. Conclusions: Translucent zirconium dioxide crowns can be veneered with minimal thickness layer of 0.5 mm porcelain without showing significantly reduced fracture strength compared to traditionally veneered (1.0-2.0 mm) crowns. Fracture strength of micro-veneered crowns with a layer of porcelain (0.3 mm) is lower than that of traditionally veneered crowns but still within range of what may be considered clinically sufficient. Porcelain layers of 2.0 mm or thicker should be used where expected loads are low only.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"3 1","pages":"74-83"},"PeriodicalIF":0.0,"publicationDate":"2017-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2017.1403288","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35658165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Dimensional stability of two impression materials after a 6-month storage period. 两种压印材料储存6个月后的尺寸稳定性。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2017-11-14 eCollection Date: 2017-01-01 DOI: 10.1080/23337931.2017.1401933

Francisco Martins, Patrícia Branco, José Reis, Ignacio Barbero Navarro, Paulo Maurício

{"title":"Dimensional stability of two impression materials after a 6-month storage period.","authors":"Francisco Martins, Patrícia Branco, José Reis, Ignacio Barbero Navarro, Paulo Maurício","doi":"10.1080/23337931.2017.1401933","DOIUrl":"https://doi.org/10.1080/23337931.2017.1401933","url":null,"abstract":"Objective: Oral rehabilitation success is enhanced by an accurate and reproducible final impression. The purpose of this study is to evaluate the dimensional changes of a polyether and addition silicone subjected to disinfection and/or sterilization after a long storage period. Material and methods: Ninety samples were obtained from polyether ImpregumTM PentaTM (3M ESPETM, Seefeld, Germany) and 90 of addition silicone ImprintTM 4 PentaTM Putty (3M ESPETM, Seefeld, Germany) according to ISO 4823:2000. The samples of each material were split to form three groups with 30 samples each: a control group, a hypochlorite group (disinfection) and an autoclave group (sterilization). Samples were stored in the Portuguese Institute for Quality for six months at 23 °C. Samples were measured by laser interferometry, according to the Michelson technique before calculating dimensional stability according ISO 4823:2000. A statistical analysis via a three-way mixed ANOVA was performed. Results: Significant shrinkage of ImpregumTM PentaTM was 0.77 ± 0.17% in the control group, 0.42 ± 0.19% in the hypochlorite group and 0.52 ± 0.28% in the autoclave group. For ImprintTM 4 PentaTM Putty, the control group had a shrinkage of 0.42 ± 0.12%, the hypochlorite group 0.36 ± 0.09% and the autoclave group 0.59 ± 0.13%. Conclusions: The long-term storage of samples subjected to disinfection with 5.25% hypochlorite or autoclave sterilization can be used in a clinical setting as the dimensional changes are below the maximum permitted by the ISO 4823:2000, since there are no clinically significant changes in the dimension of the samples during the storage period.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"3 1","pages":"84-91"},"PeriodicalIF":0.0,"publicationDate":"2017-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2017.1401933","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35658167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Cobalt-chromium alloys in fixed prosthodontics in Sweden. 钴铬合金在瑞典固定修复中的应用。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2017-08-11 eCollection Date: 2017-01-01 DOI: 10.1080/23337931.2017.1360776

Maria Kassapidou, Victoria Franke Stenport, Lars Hjalmarsson, Carina B Johansson

{"title":"Cobalt-chromium alloys in fixed prosthodontics in Sweden.","authors":"Maria Kassapidou, Victoria Franke Stenport, Lars Hjalmarsson, Carina B Johansson","doi":"10.1080/23337931.2017.1360776","DOIUrl":"https://doi.org/10.1080/23337931.2017.1360776","url":null,"abstract":"Aim: The aim of this study was to compile the usage of Co-Cr alloys in fixed prosthodontics (FP) among dental laboratories in Sweden. Methods: From March to October 2015, questionnaires were sent to 542 registered dental laboratories in Sweden. The questionnaires were divided in two parts, one for fixed dental-supported prosthodontics (FDP) and one for fixed implant-supported prosthodontics (FIP). Reminders were sent three times. Results: In total of 542 dental laboratories, 55% answered the questionnaires. Most dental laboratories use Co-Cr in FP, 134 (74%) in FDP and 89(66%) in FIP. The laboratories used Co-Cr alloys of various compositions in the prostheses, 35 for FDP and 30 for FIP. The most commonly used Co-Cr alloys for tooth-supported FDPs were (a) Wirobond® 280, (b) Cara SLM and (c) Wirobond® C. For implant-supported frameworks the frequently used alloys were: (a) Cara SLM, (b) Cara Milled and (c) Wirobond® 280. Except for the difference in composition of these alloys, they were also manufactured with various techniques. In tooth-supported prostheses the dominating technique was the cast technique while newer techniques as laser-sintering and milling were more commonly reported for implant-supported constructions. A fourth technique; the 'pre-state' milling was reported in FDP. Conclusion: More than 30 different Co-Cr alloys were reported as being used in FP. Thus, there is a need for studies exploring the mechanical and physical behavior and the biological response to the most commonly used Co-Cr alloys.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"3 1","pages":"53-62"},"PeriodicalIF":0.0,"publicationDate":"2017-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2017.1360776","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35658230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 32

Water sorption and solubility of polyamide denture base materials. 聚酰胺义齿基托材料的吸水性和溶解度。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2017-05-13 eCollection Date: 2017-01-01 DOI: 10.1080/23337931.2017.1326009

Long G Nguyen, Hilde M Kopperud, Marit Øilo

{"title":"Water sorption and solubility of polyamide denture base materials.","authors":"Long G Nguyen, Hilde M Kopperud, Marit Øilo","doi":"10.1080/23337931.2017.1326009","DOIUrl":"https://doi.org/10.1080/23337931.2017.1326009","url":null,"abstract":"Purpose: Some patients experience adverse reactions to poly(methyl methacrylate)-based (PMMA) dentures. Polyamide (PA) as an alternative to PMMA has, however, not been well documented with regard to water sorption and water solubility. The aim of this in vitro study was to measure water sorption and water solubility of two PA materials compared with PMMA, and to evaluate the major components released from the PA materials and the effect on hardness of the materials. Methods: Ten discs (40.0 mm diameter, 2.0 mm thick) of each material (PA: Valplast and Breflex; PMMA: SR Ivocap HIP) were prepared according to manufacturers' recommendations. The specimens were tested for water sorption and water solubility, according to a modification of ISO 20795-1:2008. Released substances were analysed by gas chromatography/mass spectrometry (GC/MS). Results: There were statistically significant differences among the materials regarding water sorption, water solubility and time to water saturation. Breflex had the highest water sorption (30.4 μg/mm3), followed by PMMA-material (25.8 μg/mm3) and Valplast (13.6 μg/mm3). Both PA materials had statistically significant lower water solubility than the PMMA. Both PA had a net increase in weight. Analysis by GC/MS identified release of the compound 12-aminododecanolactam from the material Valplast. No release was found from the Breflex material. Conclusions: The PA denture materials show differences in water sorption and solubility, but within the limits of the standard requirements. The PA showed a net increase in weight after long-term water sorption. The clinical implications of the findings are not elucidated.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"3 1","pages":"47-52"},"PeriodicalIF":0.0,"publicationDate":"2017-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23337931.2017.1326009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35112842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19