Biomaterial investigations in dentistry最新文献_第10页

Quantification of porosity in composite resins delivered by injectable syringes using X-ray microtomography. 用x射线显微断层扫描定量注射注射器输送的复合树脂的孔隙度。

Biomaterial investigations in dentistry Pub Date : 2020-07-06 DOI: 10.1080/26415275.2020.1784013

Bo Wold Nilsen, Mathieu Mouhat, Asbjørn Jokstad

{"title":"Quantification of porosity in composite resins delivered by injectable syringes using X-ray microtomography.","authors":"Bo Wold Nilsen, Mathieu Mouhat, Asbjørn Jokstad","doi":"10.1080/26415275.2020.1784013","DOIUrl":"https://doi.org/10.1080/26415275.2020.1784013","url":null,"abstract":"Objective: To assess whether composite polymer resin delivered in compules include pores and the possible effect on the amount of porosity in dental restorations.Method and materials: Original compules containing unpolymerised composite polymer resin (CPR) were scanned in a micro-CT. Four products were examined, which comprised universal composites (Herculite XRV Ultra, Ceram.X Universal, Tetric Evo Ceram) and a flowable bulk-fill composite (SDR) (n = 10 per group). The pore size distribution and amount of porosity (vol.%) were estimated for the unpolymerized and polymerized material used to restore a standardised cavity in a typodont tooth. Manufacturers' instructions were followed regarding material handling, and polymerisation by use of a calibrated light-curing unit. The pore characteristics and their size distribution, and the amount of porosity in the dental restoration were contrasted with the values measured in the compule. Non-parametric tests were used to analyse differences between the four products.Results: All the composite polymer resin compules contained unpolymerised material that included pores. The universal composite compules included pores predominantly in the sub-100 µm sizes. In contrast, the flowable bulk-fill compules included a few pores with a diameter >100 µm, which were assumed to be air-bubbles. The unpolymerised material within the compule included consistently more pores compared to the extruded portion from the compule tip, and in the final restoration (p < .001). The amount of porosity in the restorations differed amongst the tested materials, with the flowable bulk-fill composite showing the lowest amount of porosity (p < .01).","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"86-95"},"PeriodicalIF":0.0,"publicationDate":"2020-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2020.1784013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38829617","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: 7

Bilayered composite restoration: the effect of layer thickness on fracture behavior. 双层复合材料修复:层厚对断裂行为的影响。

Biomaterial investigations in dentistry Pub Date : 2020-06-02 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1770094

Lippo Lassila, Eija Säilynoja, Roosa Prinssi, Pekka K Vallittu, Sufyan Garoushi

{"title":"Bilayered composite restoration: the effect of layer thickness on fracture behavior.","authors":"Lippo Lassila, Eija Säilynoja, Roosa Prinssi, Pekka K Vallittu, Sufyan Garoushi","doi":"10.1080/26415275.2020.1770094","DOIUrl":"https://doi.org/10.1080/26415275.2020.1770094","url":null,"abstract":"Purpose: By combining the increased toughness of a resin composite reinforced with discontinuous fibers and the surface wear resistance of a particulate filler composite (PFC), a bilayered composite technique was recently introduced. This study aimed to evaluate the effect of the thickness of the overlaying PFC placed over a fiber-reinforced composite (FRC) core, on the fracture-behavior of direct crown restorations. Methods: Six groups of posterior crown restorations (n = 8/group) were fabricated having a discontinuous FRC-core (everX Flow) and a layer of surface PFC (Essentia U) with various thicknesses (0.5, 1.0, 1.5, 2.0 mm), with the remaining thickness of the bilayered being 6 mm. Control groups were only made of PFC or FRC materials. Restorations were statically loaded until fracture. Failure-modes were visually examined. Data were analyzed using ANOVA (p = .05) and regression analysis. Results: The regression analysis showed that by decreasing the thickness of PFC layer, the load bearing capacity of restorations increased linearly (R2=0.7909). ANOVA revealed that crown restorations made only from everX Flow composite had significantly higher load-bearing capacities (3990 ± 331 N) (p < .05) among all the groups tested. With regard to the failure-mode analysis, crowns that had a FRC core material of everX Flow revealed delamination of the PFC surface composite from the core. Crowns which were made only of PFC i.e. with no fiber reinforcement, showed a crushing-like fracture pattern. Conclusions: Restorations combining a thick FRC-core and a thin surface layer of PFC (0.5-1 mm), displayed promising performance related to fracture-behavior and load-bearing capacity.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"80-85"},"PeriodicalIF":0.0,"publicationDate":"2020-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2020.1770094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38454425","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: 13

Ion release from three different dental alloys - effect of dynamic loading and toxicity of released elements. 三种不同牙用合金的离子释放——动态载荷效应和释放元素的毒性。

Biomaterial investigations in dentistry Pub Date : 2020-04-24 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1747471

Ketil Hegerstrøm Haugli, Morten Syverud, Jan Tore Samuelsen

{"title":"Ion release from three different dental alloys - effect of dynamic loading and toxicity of released elements.","authors":"Ketil Hegerstrøm Haugli, Morten Syverud, Jan Tore Samuelsen","doi":"10.1080/26415275.2020.1747471","DOIUrl":"https://doi.org/10.1080/26415275.2020.1747471","url":null,"abstract":"Objective: The aims of this in vitro study were to assess if dynamic loading increases the metal ion release of selected dental alloys and to evaluate the cytotoxicity of the released metal ions. Materials and methods: One Pd-Ag alloy (Aurolite 2B) and two Co-Cr alloys (Wirobond 280 and d.Sign 30) were investigated. Two different corrosion immersion tests were used: a standardized static test (ISO 22674: 2016) and an experimental dynamic test. Both tests involved immersion of the specimens in a lactic acidic solution (pH = 2.3). Inductively coupled plasma mass spectrometry was used to identify and quantify released elements. A human monocyte cell-line (THP-1) was exposed to serially diluted solutions containing the selected metal ions. Cell viability was measured using the methyl-thiazolyl-tetrazolium assay. Results: According to the threshold defined in ISO 22674, only low concentrations of released elements were observed for both corrosion tests. No increase in metal ion release from the dynamic test compared with the static test was observed. Of the released elements, only Zn(II) and Co(II) showed a cytotoxic effect on THP-1 cells at 250 µM and higher concentrations. No increased viability loss was observed when adding other released elements to the exposure mixture. Conclusions: The tested alloys showed low levels of metal ion release from both static and dynamic corrosion testing. Dynamic loading did not increase the metal ion release compared to the static corrosion test. Concentrations of 250 µM and above of Zn(II) and Co(II) showed a cytotoxic effect on THP-1 cells.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"71-79"},"PeriodicalIF":0.0,"publicationDate":"2020-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2020.1747471","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38007030","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: 7

Editorial. 社论。

Biomaterial investigations in dentistry Pub Date : 2020-03-30 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1724646

Anne Peutzfeldt, Jon E Dahl

引用次数: 0

Effect of ceramic material type on the fracture load of inlay-retained and full-coverage fixed dental prostheses. 陶瓷材料类型对嵌体保留与全覆盖固定义齿断裂载荷的影响。

Biomaterial investigations in dentistry Pub Date : 2020-03-30 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1744443

Hamid Kermanshah, Fariba Motevasselian, Saeedeh Alavi Kakhaki, Mutlu Özcan

{"title":"Effect of ceramic material type on the fracture load of inlay-retained and full-coverage fixed dental prostheses.","authors":"Hamid Kermanshah, Fariba Motevasselian, Saeedeh Alavi Kakhaki, Mutlu Özcan","doi":"10.1080/26415275.2020.1744443","DOIUrl":"https://doi.org/10.1080/26415275.2020.1744443","url":null,"abstract":"Objective: Ceramic inlay-retained fixed partial denture (IRFPD) is a conservative prosthetic option but the mechanical durability of new high strength zirconia reinforced glass ceramic FPDs is not investigated. The purpose of this study was to compare fracture load of 3-unit ceramic FPDs. Materials and methods: Extracted premolars and molars (N = 64) were used to create three test groups (IRFPDs) and one control group (full coverage FPD) (n = 8). The teeth were embedded in PMMA resin with a mesiodistal distance of 6 mm. Premolars had a distal and molars had a mesial inlay preparation (width: 3 mm; height: 4 mm) in the test groups. IRFPDs were made from a zirconia reinforced lithium silicate (VS) or a monolithic zirconia. Zirconia IRFPDs received 2 types of surface treatments: sandblasting (Zr-IRFPD) or internal coating with feldspathic porcelain (ZrC-IRFPD). Control group was made from monolithic zirconia with the same connector size and zirconia surfaces were sandblasted (Zr-FPD). All restorations were cemented using a resin luting cement. After 5000 thermo-cycles, fracture load values (N) were determined with a universal testing machine at a crosshead speed of 0.75 mm/min. Data were analyzed using 1-way ANOVA and Tukey`s post hoc test (p ˂ .05). Result: Fracture load (mean ± SD) of Zr-FPDs, Zr-IRFPDs and ZrC-IRFPDs were 672 ± 183, 672 ± 123 and 638 ± 59, respectively, being not statistically different (p > .05). VS-IRFPD exhibited statically lower values (391 ± 136). The predominant mode of failure was fracture at the connector area in all groups. Conclusion: The fracture load of 3-unit IRFPD was significantly affected by types of ceramics but the retainer design and surface treatment in Zr groups did not show a significant effect.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"62-70"},"PeriodicalIF":0.0,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2020.1744443","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37878832","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

Marginal gap and fracture resistance of CAD/CAM ceramill COMP and cerasmart endocrowns for restoring endodontically treated molars bonded with two adhesive protocols: an in vitro study. CAD/CAM ceramill COMP和cerasmart牙冠修复牙髓治疗后牙体的边缘间隙和抗断裂性能的体外研究

Biomaterial investigations in dentistry Pub Date : 2020-02-25 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1728277

Israa Atif Kassem, Ibrahim Elsebai Farrag, Samir Mahmoud Zidan, Jylan Fouad ElGuindy, Reham Said Elbasty

{"title":"Marginal gap and fracture resistance of CAD/CAM ceramill COMP and cerasmart endocrowns for restoring endodontically treated molars bonded with two adhesive protocols: an in vitro study.","authors":"Israa Atif Kassem, Ibrahim Elsebai Farrag, Samir Mahmoud Zidan, Jylan Fouad ElGuindy, Reham Said Elbasty","doi":"10.1080/26415275.2020.1728277","DOIUrl":"https://doi.org/10.1080/26415275.2020.1728277","url":null,"abstract":"Endocrowns represent a conservative and esthetic restorative alternative to full coverage crowns. They can be constructed using various CAD/CAM materials that can provide a modulus of elasticity similar to that of teeth. The ability to use of such materials in composite blocks that can be easily repaired is also an advantage, provided appropriate bonding performance is ensured. This study, therefore, evaluated the marginal gap and fracture resistance of two CAD/CAM endocrown materials using two bonding protocols. Thirty-two mandibular molars were evaluated in two groups based on the material type: a Cerasmart group (GC America Inc; n = 16) acting as the control and a Ceramill COMP group (Amann Girrbach, Germany; n = 16). These groups were then classified according to the bonding protocol used: a total-etch bonding protocol (n = 8) and a self-etch bonding protocol (n = 8) implemented using RelyX ultimate adhesive resin cement (3M ESPE). The samples were then subjected to aging by simulating a 1-year thermo-mechanical process. The marginal gap results were statistically insignificant across the material and bonding protocol groups before thermo-mechanical aging. Thermo-mechanical aging significantly reduced the marginal gap distance for Ceramill COMP endocrowns cemented using the total-etch protocol (p = 0.002). No statistically significant difference was recorded for the fracture resistance in either the material or bonding protocol groups (p ≥ 0.05). Both materials and bonding protocols can, therefore, be used in the posterior region providing conservative treatment, adequate marginal gap and fracture resistance.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"50-60"},"PeriodicalIF":0.0,"publicationDate":"2020-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2020.1728277","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37758240","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

Discrepancy in alloy composition of imported and non-imported porcelain-fused-to-metal (PFM) crowns produced by Norwegian dental laboratories. 挪威牙科实验室生产的进口和非进口金属烤瓷冠（PFM）合金成分的差异。

Biomaterial investigations in dentistry Pub Date : 2020-02-11 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1724512

Håvard Jostein Haugen, Brandon Michael Soltvedt, Peter N Nguyen, Hans Jacob Ronold, Gaute Floer Johnsen

{"title":"Discrepancy in alloy composition of imported and non-imported porcelain-fused-to-metal (PFM) crowns produced by Norwegian dental laboratories.","authors":"Håvard Jostein Haugen, Brandon Michael Soltvedt, Peter N Nguyen, Hans Jacob Ronold, Gaute Floer Johnsen","doi":"10.1080/26415275.2020.1724512","DOIUrl":"10.1080/26415275.2020.1724512","url":null,"abstract":"Purpose: Even though the use of full ceramic crowns have become a well-established practice in dental clinics compare to the last decade, the use of imported casted porcelain-fused-to-metal (PFMs) crowns is still prevalent. The use of imported PFMs is often economically driven; however, when dentists order PFMs, they do not have capabilities to examine its true alloy content. Therefore, we raise the questions whether cheaper imported PFMs have more discrepancies in alloy content compared to domestically produced PFMs? Materials and Methods: This study included 62 porcelain-fused-to-metal crowns: 41 produced in Norway and 21 imported. Their alloy-composition was determined non-destructively by EDX and SEM. Results and Conclusions: Imported PFMs demonstrated larger deviations compared with non-imported PFMs. Significant deviation was found in key metallic elements in the different alloys (W, In, Pd, Ag). The detected deviations in key element such as Wolfram and Indium could influence the PFMs service time. These finding may be of international concern.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"41-49"},"PeriodicalIF":0.0,"publicationDate":"2020-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7033715/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37702973","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: 0

Effect of thermal cycling on temperature changes and bond strength in different test specimens. 热循环对不同试件温度变化及粘结强度的影响。

Biomaterial investigations in dentistry Pub Date : 2020-01-29 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2019.1709470

Sigfus Thor Eliasson, Jon Einar Dahl

{"title":"Effect of thermal cycling on temperature changes and bond strength in different test specimens.","authors":"Sigfus Thor Eliasson, Jon Einar Dahl","doi":"10.1080/26415275.2019.1709470","DOIUrl":"https://doi.org/10.1080/26415275.2019.1709470","url":null,"abstract":"Objectives: To investigate temperature changes in various test specimens during thermal cycling and to evaluate difference in micro-tensile repair bond strength in specimens cut from the inner or the outer area of composite blocks after thermal cycling. Materials and methods: Four rectangular composite blocks of various sizes were fabricated, and thermocouples placed in the centre of the specimens or halfway from the surface to the centre. Composite cylinders were made on ground flat extracted molars, as intended for micro-tensile and shear bond testing, with a thermocouple placed at the centre of the cylinder radius between composite and dentin. The specimens were thermal cycled between 5 °C and 55 °C with 20-60 s dwell times. The highest and lowest temperatures in the test specimens were recorded. Composite blocks were fabricated and stored in water for a week and then repaired with the same composite. After thermal cycling (5000×, 5 °C and 55 °C with a 20 s dwell time), test specimens were cut for micro-tensile testing. Results: None of the specimens tested reached the cold and warm water bath temperatures after a 20 s dwell time. In the smallest composite block, the centre core temperature reached 5 °C and 55 °C after 40 s dwell time, but lacked 1 °C after 60 s in the largest block. None of the specimens involving teeth reached water temperatures. The micro-tensile repair strength was significantly different between the outer and the central cut rods (p < .05). Conclusions: The most commonly used dwell times for thermal cycling are insufficient to create a homogeneous temperature change.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"16-24"},"PeriodicalIF":0.0,"publicationDate":"2020-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2019.1709470","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37702972","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: 22

A systematic review on the accuracy of manufacturing techniques for cobalt chromium fixed dental prostheses. 钴铬固定义齿制造技术的准确性综述。

Biomaterial investigations in dentistry Pub Date : 2020-01-20 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1714445

Per Svanborg, Lars Hjalmarsson

{"title":"A systematic review on the accuracy of manufacturing techniques for cobalt chromium fixed dental prostheses.","authors":"Per Svanborg, Lars Hjalmarsson","doi":"10.1080/26415275.2020.1714445","DOIUrl":"https://doi.org/10.1080/26415275.2020.1714445","url":null,"abstract":"Purpose: To compare the fit and assess the accuracy of tooth-supported single and multi-unit FDPs in cobalt chromium fabricated using different manufacturing techniques. Materials and methods: A systematic search was performed in three databases; PubMed, Scopus, and Web of Science, using clearly specified search terms and inclusion criteria. The search yielded 1071 articles and included 18 articles in the analysis. Data regarding the fit analyses and the methods of manufacturing were extracted and the accuracy was defined as the fit result minus the pre-set cement spacer. Internal gap (IntG) was the mean of all the internal measuring points and total gap (TotG) was the mean of all measuring points (marginal, cervical, chamfer, axial, occlusal). Results: The total gap results for fit and accuracy irrespective of manufacturing technique were 96 μm and 54 μm for single crowns, 107 μm and 54 μm for multi-unit FDPs, and 98 μm and 54 μm for both single crowns and multi-unit FDPs combined. For total gap of single crowns soft milling had the highest accuracy, for multi-unit FDPs additive manufactured restorations had the highest accuracy. With the results grouped by impression technique, the accuracy for total gap was highest for digital impressions and lower for conventional impressions. Conclusions: Due to the inherent limitations of this systematic review, it still remains unclear what effect the manufacturing technique has on the fit of FDPs. However, the descriptive results suggest that the marginal fit of cobalt chromium FDPs is not negatively affected by the manufacturing technique.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"31-40"},"PeriodicalIF":0.0,"publicationDate":"2020-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2020.1714445","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37665726","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: 13

A comparative evaluation of resin- and varnish-based surface protective agents on glass ionomer cement - a spectrophotometric analysis. 树脂基和清漆基玻璃离子水门汀表面保护剂的比较评价——分光光度法分析。

Biomaterial investigations in dentistry Pub Date : 2020-01-11 eCollection Date: 2020-01-01 DOI: 10.1080/26415275.2020.1711760

Shreya Tyagi, Abi M Thomas, Neeta Devi Sinnappah-Kang

{"title":"A comparative evaluation of resin- and varnish-based surface protective agents on glass ionomer cement - a spectrophotometric analysis.","authors":"Shreya Tyagi, Abi M Thomas, Neeta Devi Sinnappah-Kang","doi":"10.1080/26415275.2020.1711760","DOIUrl":"https://doi.org/10.1080/26415275.2020.1711760","url":null,"abstract":"Objectives: To evaluate and compare the effectiveness of resin- and varnish-based surface protective agents on Glass Ionomer Cement (GIC). The different surface protective agents used were: Vaseline®, GC Fuji VARNISH™ (varnish), G-Coat Plus™ (resin) and EQUIA® Coat (resin). Method: Thirty-six identical specimens of GIC were made. Six specimens were used in preparation of standard solution and remaining thirty were divided into five groups with six specimens in each group. Each test specimen was coated with one of the surface protecting agent except for the control group. The specimens were immersed separately into 1 ml of 0.05% methylene blue solution for 24 h and then rinsed with deionised water and further immersed into tubes containing 1 ml of 65% nitric acid. Specimens, once completely dissolved in nitric acid solution, were filtered and centrifuged. The supernatant was used to determine the absorbance using a spectrophotometer. The effectiveness of the surface protecting agents for the GIC was recorded in micrograms of dye per specimen, where low values indicate good protection. Result: Tukey HSD test revealed that GC Fuji VARNISH™ (varnish; mean = 21.25 µg/ml), G-Coat Plus™ (resin; mean = 30.39 µg/ml) and EQUIA® Coat (resin; mean = 9.32 µg/ml) were statistically not significantly different to each other and were effective in protecting the surface of GIC. Significance: The study found that there was a statistically significant difference between control and GC Fuji VARNISH™, G-Coat Plus™ and EQUIA® Coat. The three agents were found to be equally effective in protecting the surface of GIC.","PeriodicalId":72378,"journal":{"name":"Biomaterial investigations in dentistry","volume":"7 1","pages":"25-30"},"PeriodicalIF":0.0,"publicationDate":"2020-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/26415275.2020.1711760","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37665725","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: 6